Petroleum Science最新文献_第10页

Temperature- and alkali-resistant induced domestication of Bacillus pasteurii in drilling fluid and its borehole wall enhancement properties

IF 6 1区工程技术 Q2 ENERGY & FUELS

Petroleum Science

Pub Date : 2024-12-01 DOI: 10.1016/j.petsci.2024.09.019

Ze-Hua Du , Zhi-Jun Li , Jun-Xiu Chen , Zi-Yi Ma , Guang-Ding Guo , Hao Zhang , Sheng Wang

The microbial induced calcium carbonate precipitation (MICP) technology provides a new approach to solve borehole destabilization in broken formations; however, the high-temperature and alkaline environments inhibit the growth of microorganisms, which in turn affects the performance of their wall enhancement performance. In this study, a pH and temperature-coupled induced domestication method was applied to Bacillus pasteurii, and its wall enhancement performance was evaluated. Post domestication, Bacillus pasteurii exhibited high growth activity at pH 10.3 and temperature 45 °C. In a sodium carboxymethyl cellulose (CMC) drilling fluid environment, bacterial concentration reached 1.373 with urease activity at 1.98 after 24 h, and in a xanthan gum (XG) environment, the figures were 0.931 and 1.76, respectively—significantly higher than those before domestication. The Bacillus pasteurii-CMC system exhibited enhanced performance with the unconfined compressive strength of the specimen up to 1.232 MPa, permeability coefficient as low as 0.024, and calcium carbonate production up to 24.685 g. The crushed specimen portions remained lumpy with even calcium carbonate distribution. In contrast, the Bacillus pasteurii-XG system exhibited the highest unconfined compressive strength of 0.561 MPa, lowest permeability coefficient of 0.081, and the greatest calcium carbonate production of 16.03 g, with an externally cemented shell but internally loose structure and uneven calcium carbonate distribution, resulting in weaker mechanical properties. The Bacillus pasteurii induced predominantly vaterite calcium carbonate crystals in the CMC drilling fluid. In the XG drilling fluid, the crystals were mainly calcite. Both types effectively cemented the broken particles, improving formation strength and reducing permeability. However, under the same conditions, the Bacillus pasteurii-CMC system demonstrated a more pronounced enhancement effect.

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引用次数: 0

Multi-phase deformation and analogue modelling of the Junggar Basin, NW China

IF 6 1区工程技术 Q2 ENERGY & FUELS

Petroleum Science

Pub Date : 2024-12-01 DOI: 10.1016/j.petsci.2024.06.018

Jing-Qi Zhang , Fu-Sheng Yu , Yue-Feng Wang , Zhuo-Yi Shen , Jin-Lei Xiu , Yan Xue , Long-Fei Shao

Based on the theory of superimposed deformation and the regional tectonic background, the multi-phase non-coaxial superimposed structures in Junggar Basin were systematically analyzed using seismic interpretation, field outcrop observation, and paleo-stress field recovery methods according to the characteristics of the current tectonic framework. Moreover, the tectonic evolution process of the basin was reconstructed using sandbox analogue modelling technology. The results showed that the study area has experienced five phases of non-coaxial deformation with superimposition: The first phase of deformation (D₁) is characterized by NNE-SSW extension during late Carboniferous to early Permian, which formed large graben, half graben and other extensional structure style around the basin. The second phase of deformation (D₂) is represented by NE-SW compression during the middle to late Permian, and it comprised numerous contraction structures that developed based on D₁. The basic form of the entire basin is alternating uplift and depression. The third phase of deformation (D₃) is the NW-SE transpressional strike-slip in the Triassic-Jurassic, which produced numerous strike-slip structural styles in the middle part of the basin. The fourth phase of deformation (D₄) is the uniform sedimentation during Cretaceous, and the fifth phase (D₅) is the compression along NNE-SSW due to the North Tianshan northward thrust, which produced three rows of fold thrust belts and tear faults in the front of the mountain in the southern margin of the basin. The newly established three-dimensional tectonic evolution model shows that, based on the large number of NW-trending grabens and half grabens in the Carboniferous basement of Junggar Basin, multiple level NE trending uplifts have formed with the joint superposition of the late structural inversion and multiple stress fields. This has resulted in the current tectonic units of alternating uplifts and depressions in different directions in the study area.

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引用次数: 0

Mechanisms of water layer thickness and ullage height on crude oil boilover: A theoretical model coupling the effects of multiple physical fields

IF 6 1区工程技术 Q2 ENERGY & FUELS

Petroleum Science

Pub Date : 2024-12-01 DOI: 10.1016/j.petsci.2024.08.011

Qi Jing , Cong Yan , Guo-Hua Luan , Yun-Tao Li , Lai-Bin Zhang , Yue-Yang Li , Xin Li , Yun-He Zhang , Xing-Wang Song

Boilover is one of the most destructive tank fire scenarios. A series of experiments were conducted using eight different depths of oil pans (ranging from internal depths of 4–20 cm) to vary the water layer thickness and ullage height. The results indicate that the water layer effectively cools the sidewalls, reduces the burning rate, inhibits the development of hot zones, and delays the onset of boilover in small and medium-scale experiments. Conversely, the ullage height affects the burning rate, formation of hot zones, intensity of the boilover, and boilover onset time. Utilizing experimental data and thermodynamic analysis, both water layer thickness and fuel layer thickness were considered as variables to predict sidewall temperature at the fuel surface. These results were then introduced into the burning rate prediction model. A prediction model for the boilover onset time was also developed using the water layer thickness as a variable, and a thermodynamic analysis revealed the existence of a limit to the effect of water layer thickness on the boilover onset time. Bubble dynamics was introduced to analyze the boilover process at the oil-water interface, clarifying that the influence of water layer thickness and ullage height on boilover intensity primarily lies in factors such as the degree of superheat at the fuel-water interface. The study's findings hold significant implications for predicting and assessing fire accidents in storage tanks.

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引用次数: 0

Characterization of chemical composition of high viscosity heavy oils: Macroscopic properties, and semi-quantitative analysis of molecular composition using high-resolution mass spectrometry 高粘度重油化学成分的表征：宏观特性以及利用高分辨率质谱对分子成分进行半定量分析

IF 6 1区工程技术 Q2 ENERGY & FUELS

Petroleum Science

Pub Date : 2024-10-01 DOI: 10.1016/j.petsci.2024.02.019

Heavy oil is an important resource in current petroleum exploitation, and the chemical composition information of heavy oil is crucial for revealing its viscosity-inducing mechanism and solving practical exploitation issues. In this study, the techniques of high-temperature gas chromatography and high-resolution mass spectrometry equipped with an electrospray ionization source were applied to reveal the chemical composition of typical heavy oils from western, central, and eastern China. The results indicate that these heavy oils display significant variations in their bulk properties, with initial boiling points all above 200 °C. Utilizing pre-treatment and ESI high-resolution mass spectrometry, an analysis of the molecular composition of saturated hydrocarbons, aromatic hydrocarbons, acidic oxygen compounds, sulfur compounds, basic nitrogen compounds, and neutral nitrogen compounds within the heavy oil was conducted. Ultimately, a semi-quantitative analysis of the molecular composition of the heavy oil was achieved by integrating the elemental content. The semi-quantitative analysis results of Shengli-J8 heavy oil and a conventional Shengli crude oil show that Shengli-J8 heavy oil lacks alkanes and low molecular weight aromatic hydrocarbons, which contributes to its high viscosity. Additionally, characteristic molecular sets for different heavy oils were identified based on the semi-quantitative analysis of molecular composition. The semi-quantitative analysis of molecular composition in heavy oils may provide valuable reference data for establishing theoretical models on the viscosity-inducing mechanism in heavy oils and designing viscosity-reducing agents for heavy oil exploitation.

重油是当前石油开采的重要资源，而重油的化学成分信息对于揭示其致粘机理、解决实际开采问题至关重要。本研究采用高温气相色谱法和电喷雾离子源高分辨质谱法揭示了中国西部、中部和东部典型重油的化学成分。结果表明，这些重油的体积特性差异显著，初始沸点均高于 200 °C。利用预处理和 ESI 高分辨率质谱仪，对重油中饱和碳氢化合物、芳香烃、酸性氧化合物、硫化合物、碱性氮化合物和中性氮化合物的分子组成进行了分析。最终，通过整合元素含量，实现了对重油分子组成的半定量分析。胜利-J8 重油和常规胜利原油的半定量分析结果表明，胜利-J8 重油缺乏烷烃和低分子量芳香烃，因此粘度较高。此外，根据分子组成的半定量分析，确定了不同重油的特征分子组。重油分子组成的半定量分析可为建立重油致粘机理的理论模型和设计重油开采的降粘剂提供有价值的参考数据。

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引用次数: 0

Effect of cyclic hydraulic stimulation on pore structure and methane sorption characteristics of anthracite coal: A case study in the Qinshui Basin, China 循环水力刺激对无烟煤孔隙结构和甲烷吸附特性的影响：中国沁水盆地案例研究

IF 6 1区工程技术 Q2 ENERGY & FUELS

Petroleum Science

Pub Date : 2024-10-01 DOI: 10.1016/j.petsci.2024.08.001

Rui-Shuai Ma , Ji-Yuan Zhang , Qi-Hong Feng , Xue-Ying Zhang , Yan-Hui Yang

The cyclic hydraulic stimulation (CHS) has proven as a prospective technology for enhancing the permeability of unconventional formations such as coalbeds. However, the effects of CHS on the microstructure and gas sorption behavior of coal remain unclear. In this study, laboratory tests including the nuclear magnetic resonance (NMR), low-temperature nitrogen sorption (LTNS), and methane sorption isotherm measurement were conducted to explore changes in the pore structure and methane sorption characteristics caused by CHS on an anthracite coal from Qinshui Basin, China. The NMR and LTNS tests show that after CHS treatment, meso- and macro-pores tend to be enlarged, whereas micro-pores with larger sizes and transition-pores may be converted into smaller-sized micro-pores. After the coal samples treated with 1, 3, 5 and 7 hydraulic stimulation cycles, the total specific surface area (TSSA) decreased from 0.636 to 0.538, 0.516, 0.505, and 0.491 m²/g, respectively. Fractal analysis based on the NMR and LTNS results show that the surface fractal dimensions increase with the increase in the number of hydraulic stimulation cycles, while the volume fractal dimensions exhibit an opposite trend to the surface fractal dimensions, indicating that the pore surface roughness and pore structure connectivity are both increased after CHS treatment. Methane sorption isothermal measurements show that both the Langmuir volume and Langmuir pressure decrease significantly with the increase in the number of hydraulic stimulation cycles. The Langmuir volume and the Langmuir pressure decrease from 33.47 cm³/g and 0.205 MPa to 24.18 cm³/g and 0.176 MPa after the coal samples treated with 7 hydraulic stimulation cycles, respectively. The increments of Langmuir volume and Langmuir pressure are positively correlated with the increment of TSSA and negatively correlated with the increments of surface fractal dimensions.

循环水力刺激（CHS）已被证明是提高煤层等非常规地层渗透性的一项前瞻性技术。然而，CHS 对煤的微观结构和气体吸附行为的影响仍不清楚。本研究通过核磁共振（NMR）、低温氮吸附（LTNS）和甲烷吸附等温线测量等实验室测试，探讨了 CHS 对中国沁水盆地无烟煤孔隙结构和甲烷吸附特性的影响。核磁共振和LTNS测试表明，CHS处理后，中孔和大孔有增大的趋势，而尺寸较大的微孔和过渡孔可能转化为尺寸较小的微孔。经过 1、3、5 和 7 个水力刺激周期处理的煤样，总比表面积（TSSA）分别从 0.636 m/g 降至 0.538、0.516、0.505 和 0.491 m/g。基于核磁共振和 LTNS 结果的分形分析表明，表面分形尺寸随着水力刺激循环次数的增加而增加，而体积分形尺寸的变化趋势与表面分形尺寸的变化趋势相反，这表明 CHS 处理后孔隙表面粗糙度和孔隙结构连通性都有所增加。甲烷吸附等温测量结果表明，随着水力刺激循环次数的增加，Langmuir 体积和 Langmuir 压力都显著下降。经过 7 个水力刺激周期处理的煤样，朗姆体积和朗姆压力分别从 33.47 厘米/克和 0.205 兆帕降至 24.18 厘米/克和 0.176 兆帕。朗姆厄体积和朗姆厄压力的增加与TSSA的增加呈正相关，与表面分形尺寸的增加呈负相关。

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引用次数: 0

Optimal depth of in-situ pressure-preserved coring in coal seams considering roadway excavation and drilling disturbance 考虑巷道开挖和钻孔扰动因素的煤层原位保压取心的最佳深度

IF 6 1区工程技术 Q2 ENERGY & FUELS

Petroleum Science

Pub Date : 2024-10-01 DOI: 10.1016/j.petsci.2024.05.014

Using pressure-preserved coring technique to determine in-situ gas content provides a more precise assessment of gas resource reserves and safeguard of mining safety in coal seams. How coring technique and depth affect the determination of gas content is unclear due to borehole zoning rupture caused by roadway excavation and drilling disturbance. To this end, a proposed coupling model of stress distribution and gas migration was simulated and validated by FLAC^3D and COMSOL Multiphysics considering superposition effects of roadway excavation and drilling disturbance. The findings indicate that the roadway surrounding rock displays distinct zoning features including stress relief zone, stress concentration zone that is composed of plastic zone, elastic zone, and original stress zone; and the broken situations depending on the borehole peeping are consistent with the corresponding simulation results. On this basis, this study proposes a set of drilling coring depth calculation and prediction model for the gas desorption affected area under engineering disturbance. Optimal depth of coring drilling is not only approach to the in-situ coal bulk, but also can get the balance of the drilling workload and cost controlling. According to the typical mine site geological conditions and the numerical simulation results in this study, if the roadway excavation time is ∼1 year, it is recommended that the pressure-preserved coring depth should be greater than 17 m.

采用保压取心技术测定原地瓦斯含量，可以更精确地评估瓦斯资源储量，保障煤层开采安全。由于巷道开挖和钻孔扰动造成钻孔分区破裂，取芯技术和深度对瓦斯含量测定的影响尚不明确。为此，考虑到巷道掘进和钻孔扰动的叠加效应，利用 FLAC3D 和 COMSOL Multiphysics 模拟并验证了所提出的应力分布和瓦斯迁移耦合模型。研究结果表明，巷道围岩呈现出明显的分区特征，包括应力释放区、由塑性区、弹性区和原始应力区组成的应力集中区；钻孔掘进造成的破碎情况与相应的模拟结果一致。在此基础上，本研究提出了一套工程扰动下瓦斯解吸影响区钻孔取心深度计算与预测模型。最佳钻孔取心深度不仅可以接近原位煤体，还可以兼顾钻孔工作量和成本控制。根据矿区典型地质条件和数值模拟结果，若巷道掘进时间为 1 年，建议保压取心深度应大于 17 m。

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引用次数: 0

Seismic modeling by combining the finite-difference scheme with the numerical dispersion suppression neural network 将有限差分方案与数值弥散抑制神经网络相结合的地震建模方法

IF 6 1区工程技术 Q2 ENERGY & FUELS

Petroleum Science

Pub Date : 2024-10-01 DOI: 10.1016/j.petsci.2024.06.014

Hong-Yong Yan

Seismic finite-difference (FD) modeling suffers from numerical dispersion including both the temporal and spatial dispersion, which can decrease the accuracy of the numerical modeling. To improve the accuracy and efficiency of the conventional numerical modeling, I develop a new seismic modeling method by combining the FD scheme with the numerical dispersion suppression neural network (NDSNN). This method involves the following steps. First, a training data set composed of a small number of wavefield snapshots is generated. The wavefield snapshots with the low-accuracy wavefield data and the high-accuracy wavefield data are paired, and the low-accuracy wavefield snapshots involve the obvious numerical dispersion including both the temporal and spatial dispersion. Second, the NDSNN is trained until the network converges to simultaneously suppress the temporal and spatial dispersion. Third, the entire set of low-accuracy wavefield data is computed quickly using FD modeling with the large time step and the coarse grid. Fourth, the NDSNN is applied to the entire set of low-accuracy wavefield data to suppress the numerical dispersion including the temporal and spatial dispersion. Numerical modeling examples verify the effectiveness of my proposed method in improving the computational accuracy and efficiency.

地震有限差分（FD）建模受到数值离散的影响，包括时间离散和空间离散，这会降低数值建模的精度。为了提高传统数值建模的精度和效率，我将有限差分方案与数值离散抑制神经网络（NDSNN）相结合，开发了一种新的地震建模方法。该方法包括以下步骤。首先，生成由少量波场快照组成的训练数据集。低精度波场数据和高精度波场数据的波场快照是配对的，低精度波场快照涉及明显的数值色散，包括时间色散和空间色散。其次，训练 NDSNN，直到网络收敛，同时抑制时间和空间色散。第三，利用大时间步长和粗网格的 FD 模型快速计算整组低精度波场数据。第四，将 NDSNN 应用于整套低精度波场数据，以抑制包括时间和空间色散在内的数值色散。数值建模实例验证了我提出的方法在提高计算精度和效率方面的有效性。

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引用次数: 0

Efficient anti-aliasing and anti-leakage Fourier transform for high-dimensional seismic data regularization using cube removal and GPU 利用立方体去除和 GPU 为高维地震数据正则化提供高效抗锯齿和抗泄漏傅立叶变换

IF 6 1区工程技术 Q2 ENERGY & FUELS

Petroleum Science

Pub Date : 2024-10-01 DOI: 10.1016/j.petsci.2024.04.002

Seismic data is commonly acquired sparsely and irregularly, which necessitates the regularization of seismic data with anti-aliasing and anti-leakage methods during seismic data processing. We propose a novel method of 4D anti-aliasing and anti-leakage Fourier transform using a cube-removal strategy to address the combination of irregular sampling and aliasing in high-dimensional seismic data. We compute a weighting function by stacking the spectrum along the radial lines, apply this function to suppress the aliasing energy, and then iteratively pick the dominant amplitude cube to construct the Fourier spectrum. The proposed method is very efficient due to a cube removal strategy for accelerating the convergence of Fourier reconstruction and a well-designed parallel architecture using CPU/GPU collaborative computing. To better fill the acquisition holes from 5D seismic data and meanwhile considering the GPU memory limitation, we developed the anti-aliasing and anti-leakage Fourier transform method in 4D with the remaining spatial dimension looped. The entire workflow is composed of three steps: data splitting, 4D regularization, and data merging. Numerical tests on both synthetic and field data examples demonstrate the high efficiency and effectiveness of our approach.

地震数据的采集通常是稀疏和不规则的，这就要求在地震数据处理过程中使用抗混叠和抗泄漏方法对地震数据进行正则化处理。针对高维地震数据中的不规则采样和混叠问题，我们提出了一种采用立方体去除策略的新型四维抗混叠和抗泄漏傅立叶变换方法。我们通过沿径向线堆叠频谱来计算加权函数，应用该函数来抑制混叠能量，然后迭代地选取主要振幅立方体来构建傅立叶频谱。由于采用了立方体移除策略来加速傅立叶重构的收敛性，并采用了精心设计的 CPU/GPU 协同计算并行架构，因此所提出的方法非常高效。为了更好地填补 5D 地震数据的采集漏洞，同时考虑到 GPU 内存的限制，我们开发了 4D 的抗锯齿和抗泄漏傅立叶变换方法，并对剩余空间维度进行了循环。整个工作流程由三个步骤组成：数据分割、4D 正则化和数据合并。在合成数据和实地数据实例上进行的数值测试证明了我们方法的高效性和有效性。

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引用次数: 0

Characteristics, preservation mechanisms, and significance of aragonite in lacustrine shale: A case study from the Jiyang Depression, Bohai Bay Basin 湖相页岩中文石的特征、保存机制及其意义：渤海湾盆地济阳凹陷案例研究

IF 6 1区工程技术 Q2 ENERGY & FUELS

Petroleum Science

Pub Date : 2024-10-01 DOI: 10.1016/j.petsci.2024.05.019

Aragonite is a metastable mineral, which is easily transformed into calcite, and generally difficult to preserve in the stratum. However, large amounts of aragonites were found in the Paleogene shale of the Jiyang Depression. The characteristics and preservation mechanisms of these aragonites were analyzed through a series of analytical methods, including cathodoluminescence, field-emission scanning electron microscopy (FESEM), laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), micro-area carbon and oxygen isotopes, Sr isotopes, and dissolution simulation experiments under high temperature and high pressure. The research results show that: ①Aragonite in the Paleogene shale of the Jiyang Depression is related to algal microbial fossils, primarily composed of coccoliths and characterized by two emission peaks at 420 nm and 480 nm in cathodoluminescence; ②The primary factor allowing biological aragonite to be preserved is the immaturity of the organic matter and the deficiency of abundant organic acids necessary for its dissolution or transformation, which is confirmed by the evidence of organic matter maturity and simulation experiments of organic acid dissolution on aragonite under high-temperature and high-pressure conditions. Additional factors that may aid in the preservation of aragonite are the ideal sedimentation conditions, the defense of organic coating, and the enclosed environment with tiny pores, low porosity, and low permeability; ③These aragonite-rich shales, characterized by coccolithophores, provide a solid evidence for seawater intrusion into terrestrial lake basin, and have a significant implication for the source and storage of shale oil.

文石是一种易变矿物，很容易转化为方解石，一般很难保存在地层中。然而，在济阳坳陷的古近纪页岩中发现了大量文石。通过阴极发光、场发射扫描电子显微镜（FESEM）、激光烧蚀电感耦合等离子体质谱（LA-ICP-MS）、微区碳氧同位素、锶同位素以及高温高压下的溶解模拟实验等一系列分析方法，分析了这些文石的特征和保存机制。研究结果表明济阳凹陷古近纪页岩中的文石与藻类微生物化石有关，主要由茧石组成，阴极发光在 420 nm 和 480 nm 处有两个发射峰；有机质成熟的证据和高温高压条件下有机酸溶解文石的模拟实验证实了这一点。有助于文石保存的其他因素还包括理想的沉积条件、有机涂层的保护以及孔隙微小、孔隙率低、渗透率低的封闭环境；③这些富含文石的页岩以茧石为特征，为海水侵入陆地湖盆提供了确凿证据，对页岩油的来源和储存具有重要意义。

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引用次数: 0

Evaluation of the combined influence of geological layer property and in-situ stresses on fracture height growth for layered formations 评估地质层特性和原位应力对层状地层断裂高度增长的综合影响

IF 6 1区工程技术 Q2 ENERGY & FUELS

Petroleum Science

Pub Date : 2024-10-01 DOI: 10.1016/j.petsci.2024.07.014

Peng Tan , Zhao-Wei Chen , Liu-Ke Huang , Qing Zhao , Sha-Rui Shao

Fracture geometry is important when stimulating low-permeability reservoirs for natural gas or oil production. The geological layer (GL) properties and contrasts in in-situ stress are the two most important parameters for determination of the vertical fracture growth extent and containment in layered rocks. However, the method for assessing the cumulative impact on growth in height remains ambiguous. In this research, a 3D model based on the cohesive zone method is used to simulate the evolution of hydraulic fracture (HF) height in layered reservoirs. The model incorporates fluid flow and elastic deformation, considering the friction between the contacting fracture surfaces and the interaction between fracture components. First, an analytical solution that was readily available was used to validate the model. Afterwards, a quantitative analysis was performed on the combined impacts of the layer interface strength, coefficient of interlayer stress difference, and coefficient of vertical stress difference. The results indicate that the observed fracture height geometries can be categorized into three distinct regions within the parametric space: blunted fracture, crossed fracture, and T-shaped fracture. Furthermore, the results explained the formation mechanism of the low fracture height in the deep shale reservoir of the Sichuan Basin, China, as well as the distinction between fracture network patterns in mid-depth and deep shale reservoirs.

在对低渗透储层进行天然气或石油开采时，裂缝的几何形状非常重要。地质层（GL）特性和原位应力对比是确定层状岩石中垂直裂缝生长范围和封闭性的两个最重要参数。然而，评估对高度增长的累积影响的方法仍不明确。本研究采用基于粘聚区方法的三维模型来模拟层状储层中水力裂缝（HF）高度的演变。该模型结合了流体流动和弹性变形，考虑了接触裂缝表面之间的摩擦以及裂缝成分之间的相互作用。首先，使用现成的分析解决方案对模型进行验证。然后，对层界面强度、层间应力差系数和垂直应力差系数的综合影响进行了定量分析。结果表明，在参数空间内，观察到的断裂高度几何形状可分为三个不同的区域：钝形断裂、交叉断裂和 T 形断裂。此外，研究结果还解释了中国四川盆地深部页岩储层低断裂高度的形成机制，以及中深部页岩储层和深部页岩储层断裂网络模式的区别。

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引用次数: 0