Marine and Petroleum Geology最新文献

{"title":"Corrigendum to “Chronostratigraphy and petrophysical properties for the middle to late Miocene sediments in the shelf to abyssal plain of the Ulleung Basin, Korea” [Mar. Petrol. Geol. 183 (2026) 107650]","authors":"Hyun Suk Lee , Soonmi Cho , Junghee Son , Gihun Song , Juhyeon Oh , Wonjun Kwak","doi":"10.1016/j.marpetgeo.2025.107653","DOIUrl":"10.1016/j.marpetgeo.2025.107653","url":null,"abstract":"","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"183 ","pages":"Article 107653"},"PeriodicalIF":3.6,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145732853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Short-term climatic perturbations in the Paleocene Lower Wilcox","authors":"Mariana I. Olariu,&nbsp;Nikhil Sharma,&nbsp;Vann Smith,&nbsp;Maria Antonieta Lorente,&nbsp;Lorena Moscardelli","doi":"10.1016/j.marpetgeo.2025.107647","DOIUrl":"10.1016/j.marpetgeo.2025.107647","url":null,"abstract":"<div><div>Understanding how climatically-driven changes can produce significant sea level fluctuations, especially during periods of Earth's history that lacked continental-scale ice sheets remains a key geological question. We use an example from the Paleocene Lower Wilcox greenhouse time to illustrate how climatically-influenced short-term (100–400 kyr) sea-level changes controlled sedimentary deposition. Our interpretations are based on a geochemical proxy model for greenhouse humid–arid climatic shifts and on palynological analysis. Provenance tracers in the studied Lower Wilcox section (∼3 Myr) indicate that the average source composition remained steady, suggesting that variations observed in cores could have been mainly driven by climate. During the humid greenhouse phases, enhanced weathering and precipitation likely increased sediment supply and promoted progradation of deltas. A higher influx of freshwater during humid intervals might have favored the development of coastal marshy conditions characterized by the presence of the fern spore <em>Deltoidospora</em>. Arid greenhouse phases appear to correspond to diminished sediment input and shoreline retreat. The presence of <em>Classopollis,</em> a pollen produced by plants of the extinct Cheirolepidiaceae, is indicative of arid coastal salt marshes and generally higher abundances of <em>Classopollis</em> in the Selandian core sections may suggest more arid conditions.</div><div>Repetitive 4th order regressive-transgressive cycles and modest facies belt shifts are observed in cores from two wells. Subsurface sandstone mapping reflects short excursions of the shoreline during repeated cross shelf transits amid an overall backstepping 3rd order depositional sequence. We interpret these as potentially reflecting climatically modulated changes, though we recognize the limitations and uncertainties associated with interpreting weathering signals from marginal marine deposits. A multiproxy approach strengthens the case for climate-related influences on short-term sea-level dynamics.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"183 ","pages":"Article 107647"},"PeriodicalIF":3.6,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145620208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-dimensional stratigraphic forward modeling for the prediction of facies associations and porosity in pre-salt carbonate rocks of the Sapinhoá oil field, Santos Basin, Brazil","authors":"Vinícius Lôndero ,&nbsp;Andressa Bressane ,&nbsp;Márcio Cardoso Jr. ,&nbsp;Luciano Garcia Garim ,&nbsp;José Manuel Marques Teixeira de Oliveira ,&nbsp;Ilana Lehn ,&nbsp;Adali Ricardo Spadini ,&nbsp;Lubín Eric Cayo ,&nbsp;Samuel Magalhães Viana ,&nbsp;José Eduardo Faccion ,&nbsp;Paulo Roberto Moura de Carvalho ,&nbsp;Roberto Salvador Francisco D’Avila ,&nbsp;Ariane Santos da Silveira","doi":"10.1016/j.marpetgeo.2025.107645","DOIUrl":"10.1016/j.marpetgeo.2025.107645","url":null,"abstract":"<div><div>Pre-salt reservoir quality prediction is a complex task that demands alternative studies to better estimate its physical properties. The Barra Velha Formation (Aptian) in the Sapinhoá field, Santos Basin, presents carbonate rocks with a high degree of heterogeneity in their lateral and vertical distributions. Wells are confined mostly to the structural high area, and the seismic lacks vertical resolution; thus, forward stratigraphic modeling can be a good alternative to represent this complex depositional system at a sub-seismic scale. The simulation was performed in the software StratBR, a stratigraphic forward-modeling software developed by Petrobras that performs rule-based simulations. The simulation consisted of 200 time steps ranging from the base of the Barra Velha Formation (123 Ma) to its upper limit at the salt base (113 Ma). Water depth and wave energy were used as proxies for facies association distribution, filling the available depositional space for each time step, calculated by the backstripping method. This simulated facies association model was then used to calculate porosity properties with the fuzzy method, using each facies association porosity distribution and patterns of spatial porosity variation as inputs. The facies association model is compatible with the geometry and depositional patterns observed in the seismic, with a mean well accuracy of 56.28%. The porosity model reproduced spatial property changes, both laterally and vertically, throughout the study area. Both models operate at sub-seismic scale and provide complementary results for the characterization and prediction of essential properties in future oil and gas exploratory prospects.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"183 ","pages":"Article 107645"},"PeriodicalIF":3.6,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145526187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shale oil in the Lower Cretaceous of the Erennaoer Depression, Erlian Basin: Insights from in-situ fluid content and hydrocarbon micromigration","authors":"Junjie Wang ,&nbsp;Pengfei Zhang ,&nbsp;Weizheng Gao ,&nbsp;Panxue Li ,&nbsp;Yangjian Yi ,&nbsp;Chenxi Wu ,&nbsp;Han Wu ,&nbsp;Xinlin Song ,&nbsp;Wenbiao Li ,&nbsp;Guohui Chen ,&nbsp;Nengwu Zhou ,&nbsp;Chao Liu ,&nbsp;Shuangfang Lu","doi":"10.1016/j.marpetgeo.2025.107651","DOIUrl":"10.1016/j.marpetgeo.2025.107651","url":null,"abstract":"<div><div>Understanding the occurrence and enrichment mechanisms of shale oil is essential for the effective exploration of continental basins with complex reservoir characteristics. In this study, an integrated approach combining nuclear magnetic resonance (NMR) with fluid restoration techniques, Rock-Eval pyrolysis, total organic carbon (TOC) analysis, X-ray diffraction (XRD), crude oil composition analysis, and microscopic observation was used to investigate the shale in the Erennaoer Depression of the Erlian Basin. Based on the innovative in-situ fluid content characterization method, the shale micromigration characteristics were quantitatively analyzed by micromigrated hydrocarbons (ΔQ). The coupling relationship between shale pore fluid content, pore structure, and mineral composition was analyzed, elucidating the shale pore fluid occurrence mechanisms. Three dominant shale lithofacies, felsic-rich, felsic, and calcareous, were identified, with interparticle pores at quartz grain edges serving as the primary storage space. Shale oil occurrence is jointly governed by lithofacies, pore structure, and hydrocarbon micromigration. While most samples exhibit minimal micromigration (−200 mg/g TOC &lt; ΔQ &lt; 107 mg/g TOC), interlaminar redistribution is common. In organic-lean shales (TOC &lt; 0.7 %), hydrocarbon generation capacity limits oil content, and no extra-micromigration occurs. In organic-rich shales (TOC &gt;0.7 %), excess hydrocarbons are expelled and stored in interparticle pores of quartz laminae, with free oil content positively correlated with the development of meso- to macropores. Notably, felsic-rich shales with low clay content show evidence of intra-micromigration and preferential accumulation of light-saturated hydrocarbons (C₁₄–C₁₈), resulting in ΔQ &lt; −200 mg/g TOC, OSI &gt; 200 mg/g TOC, and T_max &lt; 425 °C. These hydrocarbons form multi-scale source–reservoir coupling systems through selective micromigration into adjacent quartz laminae and felsic-rich shale interbeds with low clay, while heavier fractions remain in organic-rich layers. These findings provide new insights into the spatial distribution of shale oil and identify favorable sweet spots in the Erlian Basin, offering a foundation for resource assessment and development strategies in similar shale oil basins.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"183 ","pages":"Article 107651"},"PeriodicalIF":3.6,"publicationDate":"2025-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145576172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chronostratigraphy and petrophysical properties for the middle to late Miocene sediments in the shelf to abyssal plain of the Ulleung Basin, Korea","authors":"Hyun Suk Lee ,&nbsp;Soonmi Cho ,&nbsp;Junghee Son ,&nbsp;Gihun Song ,&nbsp;Juhyeon Oh ,&nbsp;Wonjun Kwak","doi":"10.1016/j.marpetgeo.2025.107650","DOIUrl":"10.1016/j.marpetgeo.2025.107650","url":null,"abstract":"<div><div>This study presents the first comprehensive chronostratigraphic framework for the Miocene sediments in the entire Ulleung Basin by integrating zircon U-Pb geochronology, seismic stratigraphy, and petrophysical analyses. The comparison between zircon dating and biostratigraphic constraints enhances the precision of stratigraphic correlations. Total eight maximum depositional ages derived from conventional and sidewall cores from the basin provide refined temporal resolution for key stratigraphic units, enabling a more accurate reconstruction of sedimentary processes and basin evolution during the Miocene. Petrophysical analyses along the synchronous horizons of maximum depositional ages reveal significant variations in shale volume, effective porosity, and Net-to-Gross ratio, reflecting the influence of depositional environments and diagenetic modifications on rock properties. In particular, porosity variations are predominantly influenced by depositional ages and environments as well as burial diagenesis. The results of this study enhance our understanding of the geological history and resource potential in the Ulleung Basin, serving as a foundation for future research on regional stratigraphy, hydrocarbon exploration, and reservoir characterization. Furthermore, this study highlights the importance of integrating high-resolution geochronological methods with petrophysical evaluations to enhance assessments of hydrocarbon resources and CO₂ storage capacity.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"183 ","pages":"Article 107650"},"PeriodicalIF":3.6,"publicationDate":"2025-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145526189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seismic characterization of ancient lacustrine source-to-sink systems in a rift basin: The Bozhong Depression, Bohai Bay Basin, China","authors":"Xiaobo Zheng ,&nbsp;Hongtao Zhu ,&nbsp;Sen Li ,&nbsp;Haifeng Yang ,&nbsp;Zhiwei Zeng ,&nbsp;Zhongheng Sun","doi":"10.1016/j.marpetgeo.2025.107648","DOIUrl":"10.1016/j.marpetgeo.2025.107648","url":null,"abstract":"<div><div>Lacustrine source-to-sink systems offer essential insights into sediment generation, transport, and deposition processes. However, the dynamics of ancient lacustrine source-to-sink systems, especially in rift basins, remain poorly understood due to limited well data. In this study, we use high-resolution 3D seismic data, supplemented by limited well information, to reconstruct the source-to-sink architecture and evolution on the southern slope of the Bozhong Depression, Bohai Bay Basin, China. The system consists of granite-dominated catchments, incised paleovalleys, and sedimentary fans that evolved from confined deltas to braided river deltas. Quantitative morphometric (e.g. fan area, catchment area, and catchment relief) analysis reveals a two-stage depositional evolution, driven by topographic slope variations and lake-level fluctuations. We identify two types of catchment-to-fan coupling, confined and unconfined, each reflecting distinct topographic and hydrodynamic controls. These findings refine our understanding of sediment routing in lacustrine rift basins and offer predictive value for reservoir characterization in similar tectonic settings.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"183 ","pages":"Article 107648"},"PeriodicalIF":3.6,"publicationDate":"2025-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145467356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isotopic evidence for the origin and migration of methane and carbon dioxide in terrestrial mud volcano systems: Insights from carbon and hydrogen isotope fractionation","authors":"Li Zhang ,&nbsp;Xiangxian Ma ,&nbsp;Georgy Chelnokov ,&nbsp;Vasilii Lavrushin ,&nbsp;Yuxin Guo ,&nbsp;Wasim Sajjad ,&nbsp;Zhongping Li ,&nbsp;Guodong Zheng","doi":"10.1016/j.marpetgeo.2025.107649","DOIUrl":"10.1016/j.marpetgeo.2025.107649","url":null,"abstract":"<div><div>Mud volcano systems release methane (CH₄) and carbon dioxide (CO₂), which are not only potential energy resources but also key greenhouse gases influencing global climate change. However, the formation mechanisms and geochemical characteristics of gases emitted from mud volcanoes—shaped by both thermogenic and microbial processes—are still not well understood. In this study, representative terrestrial mud volcanoes from the Junggar Basin (Northern Tianshan) and the Kuban Basin (Northern Caucasus), were investigated through stable isotopes of CH₄–H₂O, CH₄–CO₂, and CO₂–DIC systems, aiming to elucidate water–gas interactions and gas generation pathways. The hydrogen isotopic compositions of CH₄–H₂O system reveal clear regional differences between Junggar and Kuban mud volcanoes. The Junggar samples are characterized by strongly depleted δD_CH4, and highly negative ΔD_(CH4–H2O) values, indicating extensive microbial overprinting under low-temperature conditions. In contrast, the Kuban samples exhibit a wider range of ΔD values, suggesting spatial variability in microbial influence, potentially limited by localized rapid gas ascent or open systems. Carbon isotope data reveal a mixed-origin pattern, with varying contributions from both thermogenic and microbial processes. A small number of samples (e.g., Western Tsymbaly) display isotopic characteristics consistent with microbial CO₂ reduction. In contrast, other samples exhibit isotopic discrepancies among CH₄, CO₂, and DIC, suggesting that CH₄ and CO₂ were influenced by different formation mechanisms or geochemical processes. Overall, methane in both regions has primarily thermogenic sources, but has undergone varying degrees of secondary microbial alteration in the shallow subsurface (e.g., through acetate fermentation or anaerobic methane oxidation). These findings support a model of thermogenic dominance with microbial overprinting. This study highlights the value of multi-parameter isotope approaches in unraveling the complex formation and transformation mechanisms of CH₄ and CO₂ in active mud volcano systems and provides valuable geochemical constraints for gas origin tracing and natural gas exploration.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"183 ","pages":"Article 107649"},"PeriodicalIF":3.6,"publicationDate":"2025-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145526188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Retraction notice to “Machine learning assisted reservoir characterization for CO2 sequestration: A case study from the Penobscot field, Canada Offshore” [Mar. Petrol. Geol. 169 (2024) 107054]","authors":"Satya Narayan ,&nbsp;Vijay Kumar ,&nbsp;Bappa Mukherjee ,&nbsp;S.D. Sahoo ,&nbsp;S.K. Pal","doi":"10.1016/j.marpetgeo.2025.107631","DOIUrl":"10.1016/j.marpetgeo.2025.107631","url":null,"abstract":"","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"183 ","pages":"Article 107631"},"PeriodicalIF":3.6,"publicationDate":"2025-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intrasalt carbonates in the Estopanyà Salt Wall (South-Central Pyrenees): reservoir quality and implications for geothermal exploration in salt diapirs","authors":"Pedro Ramirez-Perez ,&nbsp;Gabriel Cofrade ,&nbsp;Jean-Pierre Sizun ,&nbsp;Juan D. Martín-Martín ,&nbsp;Mar Moragas ,&nbsp;David Cruset ,&nbsp;Anna Travé","doi":"10.1016/j.marpetgeo.2025.107646","DOIUrl":"10.1016/j.marpetgeo.2025.107646","url":null,"abstract":"<div><div>Stringers are disrupted rock bodies commonly enclosed within salt diapirs. Traditionally, they have been regarded as a risk factor in the energy exploitation of salt structures due to their heterogeneity and general sub-seismic scale, which hinder their detailed identification. Nevertheless, rock units in stringers may exhibit sufficient permeability and temperature to act as potential reservoirs, for instance, in geothermal energy. Despite this possibility, studies regarding the reservoir potential of intrasalt stringers remain scarce.</div><div>The well-exposed Estopanyà Salt Wall in the South-Central Pyrenees contains abundant Muschelkalk carbonate stringers, providing an excellent opportunity to study the geological controls on their reservoir properties. Four lithofacies within two stratigraphic intervals were identified. Depositional lithofacies (DLF-1 and DLF-2) preserve original rock textures, whereas alteration lithofacies (ALF-1 and ALF-2) result from intense brecciation, cementation, and dolomitization-dedolomitization affecting the depositional facies. Thermophysical analyses of 30 samples reveal limited variation in mineral density (2.61–3.00 g cm⁻³), bulk density (1.92–2.95 g cm⁻³), and thermal conductivity (2.37–3.48 W m⁻¹ K⁻¹), with the latter being primary controlled by rock mineralogy. In contrast, connected porosity (0.33–29.20 %), permeability (&lt;0.001–19.85 mD; &lt;10⁻¹⁸–10⁻¹⁴ m²), P-wave velocity (3.7–6.4 km s⁻¹ dry; 3.7–6.5 km s⁻¹ saturated conditions), and specific heat capacity (640–804 J kg⁻¹ K⁻¹) show greater variability. Property cross-plots indicate that porosity percentage and distribution are the main factors controlling the observed thermophysical behavior, which is ultimately linked to rock texture.</div><div>The area and scarce thickness of porous and permeable intervals (estimated at reservoir volumes of 0.14–4.6 km³), likely preclude the limited reservoir use of the studied stringers. However, petrographic evidence from them highlights interesting processes such as brecciation and dolomitization that may have enhanced the permeability and thermal conductivity in the past, while subsequent cementation and dedolomitization reduced reservoir quality. Accordingly, although current outcrop conditions show diminished reservoir potential, higher porosity-permeability values may be preserved in the subsurface.</div><div>Overall, this study establishes a conceptual model for the geological controls, limitations, and potential of intrasalt carbonates as unconventional reservoirs, providing comprehensive petrological and thermophysical data that can guide their exploration for geothermal production in salt diapir settings.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"183 ","pages":"Article 107646"},"PeriodicalIF":3.6,"publicationDate":"2025-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The evolution of rift grabens in the Mozambique Coastal Plain, with focus on the Zualane Graben – Southern Mozambique","authors":"Dércio Levy José ,&nbsp;Zélio Chaúque ,&nbsp;Osvaldo Cabral ,&nbsp;Mónica Juvane ,&nbsp;Rudêncio Morais ,&nbsp;Wilfried Jokat","doi":"10.1016/j.marpetgeo.2025.107643","DOIUrl":"10.1016/j.marpetgeo.2025.107643","url":null,"abstract":"<div><div>The topography of the Mozambique Coastal Plains is characterized by several grabens developed over a Mid Jurassic (Oxfordian - Kimmeridgian) volcano-sedimentary sequence, which forms the acoustic basement. These grabens, including the Zualane Graben are collectively termed the Inner Graben System (MCP Graben System in this study), strike predominantly NNW-SSE and N-S, and less commonly E-W. Most of them formed during Gondwana fragmentation from Upper Jurassic (Kimmeridgian-Tithonian?) to Lower Cretaceous (Berriasian to Hauterivian?-Barremian) times. The youngest grabens have a Late Miocene age. Often the upper part of the acoustic basement, named Stormberg volcanics, form buried volcanoes characterized by conical shapes and positive magnetic anomalies. Some of these volcanoes are aligned along the shoulders of the West and East Changani Grabens suggesting an off-rift volcanism setting. During the development of the western branch of the East African Rift System the Zualane Graben suffered an eastward horizontal displacement of approximately 20 km and was split into two segments, the Southern and Northern Zualane Graben. A stratigraphic comparison of the Zualane, Mazenga and Xai-Xai grabens revealed that all three were affected by multiple rifting events. This suggests that the grabens developed along a potential paleo Late Jurassic rifting axis, which has a N-S orientation, located along the eastern margin of the Mozambique Coastal Plains. Oil inclusions and gas shows were reported from two wells of the drill sites, and recent gas discoveries in the neighboring PT5-C concession, indicate that matured source rocks do exist in the study area or in the vicinity.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"183 ","pages":"Article 107643"},"PeriodicalIF":3.6,"publicationDate":"2025-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}