Marine and Petroleum Geology最新文献_第9页

Corrigendum to “Trace and rare earth element signatures in microcrystalline aragonite as indicators of oil vs. methane seepage” [Mar. Pet. Geol. 182 (2025), 107534] “微晶文石中痕量和稀土元素特征作为石油与甲烷渗漏指标”的勘误表[3 . Pet]。地球物理学报，2002,23(5):534 - 534。

IF 3.6 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology

Pub Date : 2025-12-01 Epub Date: 2025-09-13 DOI: 10.1016/j.marpetgeo.2025.107603

Yuedong Sun , Shanggui Gong , Jörn Peckmann , Fang Chen , Yao Guan , Dong Feng

引用次数: 0

‘Resurrected’ concretions – their resumed cementation after exhumation, transport, re-deposition and exploitation by producers of the trace fossil Chondrites when still being soft “复活的”固结物——它们经过挖掘、运输、再沉积和开采的痕迹化石球粒陨石，在仍然柔软的时候恢复胶结

IF 3.6 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology

Pub Date : 2025-12-01 Epub Date: 2025-08-08 DOI: 10.1016/j.marpetgeo.2025.107576

Andreas Wetzel , Maciej Bojanowski

Incipient concretions having argillaceous matrix and methane-derived cement were exhumed from a low-oxygenated muddy setting, transported and embedded in a fine-sandy tempestite. They were still soft after deposition of the tempestite because subsequently they were preferentially exploited by producers of the trace fossil Chondrites; its tubes are wide-spaced and rare in the tempestite but abundant and narrow-spaced in the concretions. The tubes are filled with fine sand taken from the tempestite. The stable isotope signature of the concretions (δ¹³C −39 to −22 ‰) markedly differs from that of the tempestite (δ¹³C −3 to −2‰). Organoclastic sulfate reduction (OSR) and anaerobic oxidation of methane (AOM) dominated the initial cementation of the concretions. During OSR and AOM, sulfate was reduced to sulfidic phases, including H₂S being toxic to animals. Nonetheless, Chondrites producers exploited the incipient concretions. Because around their tubes are no haloes that would indicate flushing with oxygenated water, the Chondrites producers likely lived in symbiosis with microbes utilizing and detoxicating sulfides and hence, followed a chemichnial behavior. After burrowing ceased, resumed precipitation of early diagenetic micrite filled the remaining porosity of concretions, whereas the tempestite sand was cemented by late diagenetic carbonate.

Burrowing of the displaced incipient concretions documents their still soft-to-stiff consistency, since they were only partly cemented but resistant to compaction although still in a plastic state, so that they could be burrowed. This fact explains why early diagenetic concretions are rarely found in modern muddy sediments because they are hardly recognized and easily overlooked in modern sediment cores.

Since coarse near-shore components are lacking, sediment reworking occurred distant from shore on a local swell. There, waves and currents enriched sand while concretions formed in mud underneath/nearby from where they became eroded and displaced by a stronger-than-average storm depositing them in a somewhat deeper area of restricted spatial extent.

具有泥质基质和甲烷衍生水泥的早期固结物从低氧泥泞环境中挖掘出来，运输并嵌入细砂暴风岩中。在风暴岩沉积后，它们仍然是柔软的，因为随后它们被微量化石球粒陨石的生产者优先利用；它的管在风暴岩中间距很宽，很少见，但在凝块中却很丰富，间距很窄。这些管子里装满了取自暴风石的细沙。结核的稳定同位素特征（δ13C−39 ~−22‰）与风暴岩的稳定同位素特征（δ13C−3 ~−2‰）明显不同。有机碎屑硫酸盐还原（OSR）和甲烷厌氧氧化（AOM）主导了结核的初始胶结。在OSR和AOM过程中，硫酸盐被还原为硫化物相，包括对动物有毒的H2S。尽管如此，球粒陨石的制造者利用了早期的凝结物。由于球粒陨石的管子周围没有表明被含氧水冲洗的光晕，因此球粒陨石的制造者很可能与微生物共生，利用并解毒硫化物，因此遵循了一种化学行为。凿洞结束后，早期成岩泥晶的重新沉淀填补了固结物的剩余孔隙，而晚成岩碳酸盐则胶结了风暴砂岩。对移位的早期固结物的挖掘证明了它们仍然是软到硬的一致性，因为它们只是部分胶结，但抗压实，尽管仍处于塑性状态，所以它们可以被挖洞。这一事实解释了为什么在现代泥质沉积物中很少发现早期成岩结核，因为它们在现代沉积物岩心中很难被识别和容易被忽视。由于缺乏粗糙的近岸组分，沉积物改造发生在远离海岸的局部涌浪上。在那里，海浪和水流使沙子变得丰富，而在下面或附近的泥土中形成了固结物，在那里，它们被一场强于平均水平的风暴侵蚀和移位，沉积在一个空间范围有限的更深的区域。

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引用次数: 0

Geological and geochemical approach to natural hydrogen exploration in the Northern Apennines, Italy 意大利亚平宁山脉北部天然氢勘探的地质和地球化学方法

IF 3.6 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology

Pub Date : 2025-12-01 Epub Date: 2025-09-01 DOI: 10.1016/j.marpetgeo.2025.107594

Vivian Azor de Freitas , Alessandra Montanini , Isabelle Moretti , Andrea Artoni , Stefano Segadelli , Jean de la Paix Izerumugaba , Anne Battani , Giuseppe Etiope

The western sector of Northern Apennines, Italy, presents favorable conditions for the occurrence of natural hydrogen (H₂), hosting ophiolitic bodies, hyperalkaline waters, and deep-seated faults. A geological and geochemical investigation was conducted to evaluate the potential for subsurface H₂ accumulations. The study involved gas analyses from spring waters, bubbling gas, and soil-gas measurements, along with petrographic analyses of ultramafic rocks. Multiple springs contain dissolved H₂ at low (up to 1 μM) to moderate (1 μM–100 μM) concentrations relative to other springs in serpentinized peridotites worldwide. In the Taro Valley, H₂ occurrences (0.28 μM–0.79 μM) are associated with hyperalkaline springs in proximity to exposed peridotites. However, the limited thickness of the peridotite body at Mt. Prinzera (∼250 m) suggests that the hyperalkaline water and associated H₂ likely derive from deeper unexposed ultramafic units. Petrographic analyses of spinel-peridotites reveal varying degrees of serpentinization (45 %–95 %), characterized by serpentine mesh textures with olivine relics, pyroxene converted into serpentine, and formation of magnetite and chromite. In the Bobbio Tectonic Window, springs with neutral pH waters, located away from exposed ultramafic bodies, contain higher concentrations of dissolved H₂ (0.49 μM–3.8 μM). Although the origin of this H₂ remains unclear, it may be related to hidden ultramafic bodies within the sedimentary sequence undergoing serpentinization. Notably, all the spring-related H₂ occurrences are associated with methane (CH₄), showing thermogenic isotopic signatures (δ¹³C: 58.3 ‰ to −35 ‰ and δ²H: 200 ‰ to −145 ‰). Further research should focus on the characterization of regional hydrocarbon reservoirs, which could also host natural H₂.

意大利北部亚平宁山脉西段含蛇绿岩体、高碱性水体和深部断裂，为天然氢（H2）的赋存提供了有利条件。通过地质和地球化学调查，评价了地下氢气聚集的潜力。这项研究包括对泉水、冒泡气体和土壤气体的分析，以及对超镁质岩石的岩石学分析。与世界范围内蛇纹岩橄榄岩中的其他泉相比，多个泉中溶解H2的浓度为低（高达1 μM）至中等（1 μM - 100 μM）。在Taro Valley， H2赋存（0.28 μM - 0.79 μM）与暴露的橄榄岩附近的高碱性泉水有关。然而，Prinzera山橄榄岩体的有限厚度（~ 250 m）表明，高碱性水和相关的H2可能来自更深的未暴露的超镁铁质单元。尖晶石-橄榄岩的岩石学分析显示不同程度的蛇纹石化（45% - 95%），其特征是带有橄榄石遗迹的蛇纹石网状结构，辉石转化为蛇纹石，并形成磁铁矿和铬铁矿。在博比奥构造窗口中，远离暴露的超镁铁质体的中性水体，其溶解氢浓度较高（0.49 μM - 3.8 μM）。虽然H2的来源尚不清楚，但它可能与沉积层序中隐藏的超镁铁质体有关，这些超镁铁质体正在经历蛇纹岩化。值得注意的是，所有与春季有关的H2赋存都与甲烷（CH4）有关，具有热成因同位素特征（δ13C: 58.3‰~−35‰，δ2H: 200‰~−145‰）。进一步的研究应集中在区域油气储层的表征上，这些储层也可能含有天然氢气。

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引用次数: 0

Integrated seismic stratigraphic, sedimentological and petrophysical approaches for characterizing the Cenomanian reservoirs in transitional highs of north Western Desert intra-cratonic rift basins, Egypt 埃及西北沙漠克拉通内裂谷盆地过渡高地塞诺曼尼亚期储层综合地震地层、沉积学和岩石物理方法研究

IF 3.6 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology

Pub Date : 2025-12-01 Epub Date: 2025-08-11 DOI: 10.1016/j.marpetgeo.2025.107581

Ahmed Awadalla , Ali Farag , Andrea Moscariello , Mahmoud Leila

The Cenomanian Bahariya Formation is the most prolific hydrocarbon reservoir within the Mesozoic intra-cratonic rift basins of the Egyptian Western Desert. However, it remains under-explored in the transitional structural highs bordering these basins. These transitional regions host thin hydrocarbon pay zones in the sandstones of the Bahariya Formation. These sandstones exhibit pronounced petrophysical heterogeneity, which poses significant challenges to reservoir characterization and prediction, and their depositional characteristics and controls on the reservoir facies distribution have never been investigated. This study employs an integrated approach utilizing seismic stratigraphy, sedimentary facies analysis and petrophysics to establish the relationship between the Bahariya depositional patterns, reservoir rock types, and hydraulic flow units. Understanding these relationships is essential for assessing reservoir performance and identifying high-quality reservoir intervals for future exploration and production in these transitional regions. The studied core intervals comprise the Upper Bahriya reservoirs in two wells (Wadi El-Rayan-3X “WR-3X″ and Rayan-3X “R-3X”). The cored intervals consist mainly of sixteen sandstone, mudstone and siltstone lithofacies that were grouped into nine facies associations (FA) deposited in a muddy tide-dominated estuarine environment. Sandstone lithofacies were preferentially accumulated in narrow (<1 km width) tidal channels (FA2) and sub-tidal bars (FA3). The sandstones of FA2, FA3 were classified as reservoir rock types (RRTs) 1 and 2 (RRT1, RRT2) with best reservoir characteristics and contribute to more than 90 % of the flow capacity of the Upper Bahariya reservoir. Conversely, mixed tidal flats (FA1) and intertidal sand bars (FA4) exhibit the poorest reservoir quality with pore system dominated by micropores and mesopores and act as effective fluid flow barriers. Petrophysical heterogeneity analysis indicates that sandstone lithofacies deposited within the outer estuarine tidal channels and subtidal bar environments exhibit the lowest degree of pore system heterogeneity. These facies are characterized by the dominance of well-connected macropores. The present results underscore the inherent heterogeneity of tide-dominated estuarine systems, where rapid lateral and vertical facies transitions, driven by fluctuating tidal energy and sediment supply, create complex reservoir architectures. Despite this complexity, the study demonstrates that higher-quality reservoir facies tend to preferentially accumulate in zones subjected to stronger tidal currents—specifically in the outer estuarine domain.

塞诺曼尼亚-巴哈里亚组是埃及西部沙漠中生代克拉通内裂谷盆地中最丰富的油气储层。然而，在与这些盆地接壤的过渡性构造隆起中，油气资源仍未得到充分开发。这些过渡带在巴哈里亚组砂岩中具有薄的油气产层。这些砂岩具有明显的岩石物理非均质性，这给储层表征和预测带来了重大挑战，其沉积特征及其对储层相分布的控制作用也从未被研究过。本研究采用地震地层学、沉积相分析和岩石物理学相结合的方法，建立了巴哈里亚沉积模式、储层岩石类型和水力流动单元之间的关系。了解这些关系对于评估储层动态和确定高质量的储层层段，为未来在这些过渡区域的勘探和生产奠定基础。研究的岩心层段包括两口井（Wadi El-Rayan-3X“WR-3X″”和Rayan-3X“R-3X”）的上部Bahriya油藏。取心层段主要由16个砂岩、泥岩和粉砂岩岩相组成，分为9个相组合，沉积于以泥质潮汐为主的河口环境。砂岩岩相主要聚集在狭窄（宽度约1 km）的潮道（FA2）和潮下坝（FA3）。FA2、FA3砂岩被划分为储层特征最好的储层岩石类型（RRTs） 1和2 (RRT1、RRT2)，占上巴哈里亚水库流量的90%以上。相反，混合潮滩（FA1）和潮间带砂坝（FA4）储层质量最差，孔隙系统以微孔和中孔为主，是有效的流体流动屏障。岩石物理非均质性分析表明，沉积在河口外潮道和潮下坝环境中的砂岩岩相孔隙系统非均质性最低。这些相以连接良好的大孔隙为主。目前的结果强调了潮汐主导的河口系统的内在异质性，在波动的潮汐能和沉积物供应的驱动下，快速的横向和垂直相转变创造了复杂的水库结构。尽管存在这种复杂性，但研究表明，高质量的储层相往往优先聚集在受更强潮流影响的区域，特别是在河口外区域。

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引用次数: 0

Hydrothermal structures in alkaline lake shales, the Permian Fengcheng Formation of the Junggar Basin, NW China 准噶尔盆地二叠系丰城组碱性湖页岩热液构造

IF 3.6 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology

Pub Date : 2025-12-01 Epub Date: 2025-08-09 DOI: 10.1016/j.marpetgeo.2025.107578

Kai Zhong , Pei Guo , Zhiming Li , Jian Wang , Wangwei Liu , Baozhen Zhang , Meiyuan Song , Changzhi Li , Jinghong Xu

This study investigates how hydrothermal activity since early diagenetic stage can alter continental shale properties by focusing on the alkaline lake shales of the Late Paleozoic Fengcheng Formation in the Junggar Basin, NW China. By utilizing core and thin section observations, cathode luminescence investigations, and in-situ carbon, oxygen, and strontium isotopic analyses, the formation mechanisms of the abundant white carbonate mineral-filled structures have been studied. Four distinct types of white structures are recognized: Type-1 calcite-filled (sub)horizontal bands, Type-2 calcite-filled speckles, Type-3 dolomite-filled speckles and Type-4 dolomite-filled root-like structures. The blocky calcite in Type-1 and Type-2 structures shows dark luminescence, slightly positive carbon isotopes (+0.2 ‰ to +2.38 ‰), moderately negative oxygen isotopes (−10.53 ‰ to −7.59 ‰) and very low ⁸⁷Sr/⁸⁶Sr ratios (0.705136 to 0.705740). The dolomite in Type-3 and Type-4 structures shows dark red to green luminescence, moderately positive oxygen isotopes (+3.04 ‰ to +3.98 ‰), negative carbon isotopes (−13.64 ‰ to −8.42 ‰) and very low strontium isotopes (0.705453 to 0.705903). We interpret that the Type-1 and Type-2 structures were related to hydrothermal activity that introduced recycled meteoric waters into shallow buried sediments, induced horizontal vein formation, and led to the dilution and calcification of sodium-carbonate evaporite minerals. The Type-3 and Type-4 structures were also induced by hydrothermal activity that introduced deep-sourced hydrothermal fluids into shallow to deep burial sediments, leading to the dilution and dolomitization of sodium-carbonate evaporite minerals and molar tooth structures in shales. These hydrothermally-influenced structures can increase carbonate mineral contents, reservoir space and fluid transport pathways, significantly impacting the reservoir properties of shales.

本文以准噶尔盆地晚古生代丰城组碱性湖页岩为研究对象，探讨了早成岩期以来热液活动对陆相页岩性质的影响。通过岩心和薄片观察、阴极发光研究以及原位碳、氧、锶同位素分析，研究了丰富的白色碳酸盐矿物充填结构的形成机制。可识别出4种不同类型的白色构造：1型充填方解石（亚）水平带、2型充填方解石斑、3型充填白云石斑和4型充填白云石根状构造。块状方解石呈暗色发光，碳同位素略正（+0.2‰~ +2.38‰），氧同位素略负（- 10.53‰~ - 7.59‰），87Sr/86Sr比值极低（0.705136 ~ 0.705740）。3型和4型构造白云岩发光呈暗红色至绿色，氧同位素中正（+3.04‰~ +3.98‰），碳同位素中负（- 13.64‰~ - 8.42‰），锶同位素极低（0.705453 ~ 0.705903）。我们认为，1型和2型构造与热液活动有关，热液活动将循环大气水引入浅埋沉积物，诱发水平脉状形成，并导致碳酸钠蒸发岩矿物的稀释和钙化。3型和4型构造也是由于热液活动将深源热液流体引入浅埋至深埋沉积物中，导致页岩中碳酸钠蒸发岩矿物和磨牙构造的稀释和白云化。这些受热液影响的构造增加了碳酸盐矿物含量、储层空间和流体运移路径，显著影响了页岩的储层性质。

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引用次数: 0

Molecular migration tracers and basin modeling reconstruct the initial filling of the Ivar Aasen, Edvard Grieg, Solveig, and Johan Sverdrup fields of the Haugaland High, Norwegian North Sea 分子迁移示踪和盆地建模重建了挪威北海Haugaland High的Ivar Aasen、Edvard Grieg、Solveig和Johan Sverdrup油田的初始充填

IF 3.6 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology

Pub Date : 2025-12-01 Epub Date: 2025-09-05 DOI: 10.1016/j.marpetgeo.2025.107589

Thorsten Uwe Garlichs , Lorenz Schwark

An integration of geological, geochemical, and geophysical disciplines into a classical basin model is the key for a profound understanding of the migration and filling history of reservoirs in the Haugaland High, North Sea, as it delineates the generation, expulsion, and migration of hydrocarbons. The numerical basin model for migration assessment was tuned and calibrated with molecular geochemical data, especially by the application of benzocarbazole ratios as migration tracers and geochemical fingerprinting of oil families. Benzocarbazole distributions resolved the complex filling history and the initial filling directions of different migration sectors for the Haugaland High via their decreasing [a]/([a]+[c]) isomer ratios. These decline with increasing migration distance for different migration sectors extracted by a numerical basin model. The filling history was reconstructed as a complex multicharge system in a context of variable stages of paleobiodegradation. Hereby, benzocarbazole ratios obtained from oils and reservoir core extracts remained unaffected by biodegradation. They indicate an oil migration trend from the Viking Graben in the west of the Haugaland High towards the southeast, filling the present-day fields, e.g., Johan Sverdrup, Edvard Grieg, and Ivar Aasen. Benzocarbazole distributions represent the initial filling and do not show overprint effects by later and mature charges of oil lean in polar constituents. They thus exhibit a migration scenario in agreement with migration reconstruction via numerical basin modelling and previously proposed non-polar biomarker distributions.

将地质、地球化学和地球物理学科整合到一个经典的盆地模型中，是深刻理解北海Haugaland高地储层迁移和充填历史的关键，因为它描绘了碳氢化合物的生成、排出和迁移。利用分子地球化学数据，特别是应用苯并咔唑比作为运移示踪剂和含油系地球化学指纹，对盆地运移评价数值模型进行了调整和校准。苯并咔唑的分布通过降低[a]/([a]+[c])异构体比值，解决了Haugaland High不同运移段复杂的充填历史和初始充填方向。数值盆地模式提取的不同迁移扇区，随着迁移距离的增加，这些数值随迁移距离的增加而下降。在不同阶段的古生物退化背景下，将充填历史重构为一个复杂的多电荷系统。因此，从油和储层核心提取物中获得的苯并咔唑比例不受生物降解的影响。它们表明了石油从Haugaland High西部的Viking地堑向东南迁移的趋势，填充了今天的油田，例如Johan Sverdrup， Edvard Grieg和Ivar Aasen。苯并咔唑的分布代表了初始填充，并没有显示出后期和成熟的极性成分油的套印效应。因此，通过数值盆地模拟和先前提出的非极性生物标志物分布，它们表现出与迁移重建一致的迁移情景。

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引用次数: 0

Chronological and geochemical constraints on the origin and timing of carbonate-cemented sandstones in the Middle Jurassic Zhiluo Formation, northeastern Ordos Basin, China 鄂尔多斯盆地东北部中侏罗统直罗组碳酸盐胶结砂岩成因及时代的年代学和地球化学约束

IF 3.6 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology

Pub Date : 2025-12-01 Epub Date: 2025-09-02 DOI: 10.1016/j.marpetgeo.2025.107595

Yang Qin , Chiyang Liu , Junfeng Zhao , Yanping Ma , Lihua Yang , Nan Du

The northeastern Ordos Basin experiences significant natural gas dissipation. As key geological archives for deciphering hydrocarbon migration-dissipation processes, the genesis and timing of carbonate-cemented sandstones (CCSs) from the Zhiluo Formation (northeastern Ordos Basin) remain controversial and lack systematic investigation. In this study, we conducted a comprehensive investigation of CCSs, integrating petrographic characterization, in situ rare earth element (REE) and U-Pb geochronological analyses, coupled with C-O-Sr isotope and fluid inclusion studies. The CCSs represent non-syndepositional diagenetic products with three stages: Calcite 1 (147.4–125 Ma), Calcite 2 (119.78–100.9 Ma), and Calcite 3 (71.84–61.9 Ma). Calcite crystallinity progressively increases from Calcite 1 to 3, with distinct geochemical signatures across stages. The Calcite 1 generation predominantly originated from chemical precipitation during supergenic diagenesis, with diagenetic fluids dominated by alkaline-enriched external surface water. The formation of Calcite 2–3 was controlled by the amalgamation of deep-sourced hydrothermal fluids and hydrocarbon migration-dissipation. Notably, Calcite 2 also records superimposed supergene alteration involving terrigenous inputs, which serves as an intermediate diagenetic product. Hydrocarbon inclusions, which are ubiquitously hosted within Calcites 2–3, exhibit high thermal maturity, and the gas within inclusions has genetic affinity with Upper Paleozoic coal-derived natural gases from the Hangjinqi-Sulige field. This genetic linkage directly and compellingly indicates that Upper Paleozoic gas migration-dissipation served as the predominant light carbon source for Calcites 2–3 precipitation. The onset of Upper Paleozoic gas migration-dissipation occurred during the late Early Cretaceous, which may have persisted until present. Approximately 44.66 % of the organic-derived calcite proportion provides conclusive evidence for large-scale gas migration-dissipation.

鄂尔多斯盆地东北部天然气耗散显著。鄂尔多斯盆地东北部直罗组碳酸盐胶结砂岩作为解析油气运移耗散过程的重要地质档案，其成因和时代仍存在争议，缺乏系统的研究。在这项研究中，我们综合岩石学特征、原位稀土元素（REE）和U-Pb年代学分析，结合C-O-Sr同位素和流体包裹体研究，对CCSs进行了全面调查。CCSs为非同沉积成岩产物，分为方解石1期（147.4 ~ 125 Ma）、方解石2期（119.78 ~ 100.9 Ma）和方解石3期（71.84 ~ 61.9 Ma）。方解石结晶度从方解石1级到方解石3级逐渐增大，各阶段具有明显的地球化学特征。方解石1代主要来源于表生成岩过程中的化学沉淀，成岩流体以富碱性外地表水为主。方解石2-3的形成受深源热液和油气运移耗散的双重作用控制。值得注意的是，方解石2还记录了陆源输入的叠加表生蚀变，这是一种中间成岩产物。包裹体普遍赋存于方解石2 ~ 3中，具有较高的热成熟度，包裹体中的天然气与杭金旗—苏里格气田上古生界煤成天然气有亲缘关系。这种成因联系直接而有力地表明，上古生界的气体运移-耗散是方解石2-3降水的主要轻碳源。上古生界气体运移耗散始于早白垩世晚期，可能一直持续到现在。有机方解石比例约为44.66%，为大规模气体运移耗散提供了确凿证据。

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引用次数: 0

Seismic stratigraphic analysis of the Pre-salt of Berbigão, Sururu, and Atapu fields, Santos Basin, Brazil 巴西Santos盆地berbigo、Sururu和Atapu油田盐下地震地层分析

IF 3.7 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology

Pub Date : 2025-12-01 Epub Date: 2025-06-27 DOI: 10.1016/j.marpetgeo.2025.107529

Victor Haas Pizarro , Fábio André Perosi , Leonardo Borghi , Marcos Fetter

The Pre-salt section of Santos Basin, formed during the Lower Cretaceous, hosts one of the world's most significant hydrocarbon provinces, yet its complex carbonate reservoirs are yet to be fully understood. This study consists of a seismic analysis and interpretation of the Pre-salt interval of Berbigão, Sururu, and Atapu fields, focusing on the Upper Barra Velha Formation. A 3D seismic volume and sixteen wells were analyzed. At the Pre-salt level, five seismic units were defined. Distinct seismic facies were described and mapped throughout the Sag unit. These seismic facies were analyzed for occurrence patterns and incorporated with data from lithofacies and electrofacies. It was concluded that seismic facies Parallel corresponds to carbonate platforms principally composed of spherulitestone and mudstone variations and developed in both high- and low-energy sublittoral lake zones. Seismic facies Divergent Wedge and Fill represent profundal sediments deposited in deeper portions of the lake, where a higher concentration of organic-rich shales and mudstones would occur. This element is often associated with syndepositional faulting in the Sag unit. Seismic facies Mound represents carbonate mounds predominantly composed of shrubstone variations and shrubby spherulitestones. They occur along deep-seated faults and contain conspicuous amounts of silica and uranium. Mounds likely formed in intermediate to shallow sublittoral zones, being occasionally subjected to subaerial exposure. The formation and enrichment of these carbonate mounds are likely associated with hydrothermal processes, where faults would have acted as conduits for the percolation of hydrothermal fluids. Significant concentrations of shrubs in the Upper Barra Velha Formation are probably related to carbonate precipitation from hydrothermal fluids. The interpretations derived from this integrated study provide new insights into reservoir heterogeneity in the Upper Barra Velha, with direct implications for reservoir prediction, well placement, and production optimization in similar Pre-salt settings.

Santos盆地盐下部分形成于下白垩纪，是世界上最重要的油气产区之一，但其复杂的碳酸盐岩储层尚未被完全了解。本研究包括对berbig、Sururu和Atapu油田盐下段的地震分析和解释，重点是上Barra Velha组。对16口井的三维地震体进行了分析。在盐下水平，确定了5个地震单元。在整个凹陷单元中描述并绘制了不同的地震相。对这些地震相的产状进行了分析，并与岩相和电相资料相结合。地震相平行对应于以球晶岩和泥岩变异为主的碳酸盐岩台地，发育于高、低能滨下湖区。地震相发散楔形和填充代表了沉积在湖泊较深部分的深层沉积物，在那里会出现高浓度的富有机质页岩和泥岩。该元素通常与凹陷单元的同沉积断裂有关。地震相丘为以灌木状变异体和灌木状球粒岩为主的碳酸盐岩丘。它们沿深层断层而生，含有大量的二氧化硅和铀。土丘可能形成于中浅海下地带，偶尔受到陆上暴露。这些碳酸盐岩丘的形成和富集可能与热液作用有关，其中断层可能是热液流体渗透的管道。上巴拉Velha组灌木的显著富集可能与热液流体的碳酸盐沉淀有关。这项综合研究的解释为Upper Barra Velha的储层非均质性提供了新的见解，对类似盐下环境的储层预测、井位和生产优化具有直接意义。

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引用次数: 0

Enhancing reservoir parameter prediction workflows via advanced core data augmentation 通过先进的岩心数据增强增强油藏参数预测工作流程

IF 3.6 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology

Pub Date : 2025-12-01 Epub Date: 2025-09-11 DOI: 10.1016/j.marpetgeo.2025.107605

Xin Luo , Xinghua Ci , Jianmeng Sun , Chengyu Dan , Peng Chi , Ruikang Cui

Machine learning models that rely on core data as dataset labels have become a mainstream method for predicting reservoir parameters. However, the high costs and insufficient spatial sampling density associated with core data acquisition often result in weak nonlinear representation, poor generalization ability, and overfitting in these models. To address limited core data challenges, we propose a reliability analysis-driven workflow that optimally selects multiple core data augmentation (CDA) methods to enhance reservoir parameter prediction. This workflow achieves two primary advancements: Firstly, it mitigates data scarcity by treating core data as a minority class and applying diverse tabular data augmentation techniques to generate and rigorously evaluate reliable synthetic data. This effectively expands the useable core dataset. Secondly, leveraging this augmented data, the workflow integrates machine learning with pre-trained language models (PLMs) to develop and apply multiple combinations of augmentation-prediction models for both lithology classification and physical property parameter prediction. Field data applications demonstrate that the combination of Tabular Denoising Diffusion Probabilistic Model (TabDDPM) and Tabular Prior Data Fitting Network (TabPFN) in CDA achieves outstanding performance in evaluation metrics and case studies for lithology classification and petrophysical parameter prediction. This study provides a reproducible framework for enhancing small-sample reservoir parameter prediction in oil and gas exploration, proving that synthetic data augmentation can effectively mitigate data scarcity and open new pathways for geophysical data analysis.

依赖于岩心数据作为数据集标签的机器学习模型已经成为预测油藏参数的主流方法。然而，由于岩心数据采集成本高、空间采样密度不足，往往导致这些模型的非线性表示能力弱、泛化能力差、过拟合。为了解决有限的岩心数据挑战，我们提出了一种可靠性分析驱动的工作流程，该工作流程可优化选择多种岩心数据增强（CDA）方法来增强储层参数预测。该工作流实现了两个主要进步：首先，它通过将核心数据视为少数类并应用各种表格数据增强技术来生成和严格评估可靠的合成数据，从而减轻了数据稀缺性。这有效地扩展了可用的核心数据集。其次，利用这些增强数据，工作流将机器学习与预训练语言模型（PLMs）集成在一起，开发和应用多种增强预测模型组合，用于岩性分类和物性参数预测。现场数据应用表明，CDA中的表格去噪扩散概率模型（TabDDPM）与表格先验数据拟合网络（TabPFN）相结合，在岩性分类和岩石物性参数预测的评价指标和案例研究中取得了突出的效果。该研究为加强油气勘探中小样本储层参数预测提供了一个可重复的框架，证明了合成数据增强可以有效缓解数据稀缺，为地球物理数据分析开辟了新的途径。

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引用次数: 0

Mechanisms for initiation and termination of extraordinarily high total organic carbon in the Longmaxi Formation, Yangtze Platform, South China 扬子地台龙马溪组高总有机碳起终止机制

IF 3.6 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology

Pub Date : 2025-12-01 Epub Date: 2025-08-30 DOI: 10.1016/j.marpetgeo.2025.107588

Zongyuan Sun , Hao Chen , Xianguo Lang , Bolin Zhang , Qing Chen , Kun Zhao , Shengxian Zhu , Fangqi Zhao , Feng Liang , Chuyuan Liu , Junxuan Fan

The Early Silurian Longmaxi Formation in the Yangtze Platform of South China hosts exceptional shale gas reservoirs, particularly in intervals where total organic carbon (TOC) exceeds 3 wt%. However, the initial TOC values and termination timing of these “extraordinarily high TOC” intervals differ markedly among localities, especially between inner- and outer-shelf settings. In this study, we integrate graptolite biostratigraphy, carbon isotope chemostratigraphy, and multiple geochemical proxies (e.g., major–trace elements and sulfur isotopes) from drill cores in Yichang, Hubei Province, South China (outer shelf). We establish a refined chronostratigraphic framework, identifying an extraordinarily high TOC interval (>3 wt%) and a subsequent high TOC interval (2–3 wt%), and then compare these intervals with representative inner-shelf sections. Our results show that at the base of the Longmaxi Formation in Yichang, TOC values are notably lower than those in the inner-shelf Changning area, Sichuan Province, South China, whereas the extraordinarily high TOC interval extends to a higher stratigraphic level in Yichang. Paleoenvironmental proxies indicate that extraordinarily high TOC intervals formed in a euxinic setting with higher primary productivity, and moderate restriction, whereas the high TOC interval reflects an anoxic setting, lower productivity, and stronger restriction. By determining sedimentation rates, sulfur isotope values, paleogeographic setting, and the influence of the Kwangsian Orogeny, we propose two sedimentary models to explain TOC variability in the Longmaxi Formation. The Sedimentation Rate–H₂S Concentration Model highlights how rapid sedimentation and abundant availability of ³⁴S-enriched H₂S promote extraordinarily TOC enrichment in inner-shelf settings, while slower burial and limited H₂S availability inhibit TOC accumulation in outer-shelf locations. The Kwangsian Orogeny–Hydrographic Restriction Model associates tectonic uplift with enhanced hydrographic restriction, reducing sulfate supply and driving the diachronous termination of high TOC intervals across the platform. These insights refine our understanding of early Silurian black-shale deposition and offer practical guidance for future shale-gas exploration in South China.

华南扬子地台早志留统龙马溪组具有特殊的页岩气储层，特别是在总有机碳（TOC）超过3 wt%的层段。然而，这些“异常高TOC”区间的初始TOC值和终止时间在不同地点之间存在显著差异，特别是在内部和外部大陆架环境之间。本研究综合了湖北宜昌（外陆架）钻孔岩心的笔石生物地层学、碳同位素化学地层学和多种地球化学指标（如主要微量元素和硫同位素）。我们建立了一个精细的年代地层格架，确定了一个非常高的TOC层段（>3 wt%）和随后的高TOC层段（2-3 wt%），然后将这些层段与代表性的陆架内剖面进行比较。结果表明，宜昌龙马溪组基底TOC值明显低于四川长宁内陆架地区，而异常高TOC区间在宜昌延伸至更高的地层水平。古环境指标表明，高TOC层段形成于富氧环境，初级生产力高，限制适度；而高TOC层段形成于缺氧环境，初级生产力低，限制较强。通过测定沉积速率、硫同位素值、古地理环境和光西安造山运动的影响，提出了两种沉积模式来解释龙马溪组TOC的变化。沉积速率- H2S浓度模型强调了快速沉积和丰富的富含34s的H2S如何促进大陆架内部环境中TOC的富集，而较慢的埋藏和有限的H2S可用性抑制了大陆架外部位置TOC的积累。光县造山—水文约束模型将构造隆升与增强的水文约束联系在一起，减少了硫酸盐供应，推动了整个平台高TOC层段的历时性终止。这些发现完善了我们对早志留世黑页岩沉积的认识，为今后华南地区页岩气勘探提供了实践指导。

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引用次数: 0