Theory, technology and practice of shale gas three-dimensional development: A case study of Fuling shale gas field in Sichuan Basin, SW China

Sun, Hao; Cai, Xiaobin; Hu, Degao; Lü, Zifeng; Zhao, Peirong; Zheng, Aiwei; Wang, H. T.

doi:10.1016/s1876-3804(23)60417-3

Cited by 10 publications

(3 citation statements)

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“…Fuling block is located in the Sichuan basin east Sichuan fold belt, the southern part of Wanxian compound dyke and the western part of Fangdoushan dorsal belt of the convergence zone Jiaoshiba tectonics, Jiaoshiba tectonics is a broken backslope, surrounded by fracture confinement, the main body of the tectonics is gentle, the depth of burial in the northeast is high, the southwest is low, and the depth of burial at the bottom of the Wufeng Formation ranges from 2250 to 5200 m. 19 The Jiaoshiba tectonics is a rhombic backslope controlled by two sets of northeastern and near-south-south oriented fractures, with an axial direction of northeast, the main body of the deformation is relatively weak, showing a box-like backslope morphology, i.e., the top of the wide and gentle stratigraphic dip is small and faults are undeveloped, while the two flanks are steeply dipping and faults are developed (Figure 1). In this study, the main target layer is the Longmaxi Formation, in which there are tectonic and diagenetic fractures in the overlying and underlying strata, and the tendency of tectonic fractures varies greatly, but the dip angle is relatively concentrated and small, and it is mainly dominated by smooth slip joints.…”

Section: Background Of the Studymentioning

confidence: 99%

Correlation between Natural Seepage and Ionic Diffusion in Shales

Yang,

Liu

2024

Energy Fuels

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The contact between fracturing fluid and shale reservoir induces water-rock reactions such as self-absorption, hydration damage, and ion diffusion, which leads to disturbed reservoir test results and makes it impossible to scientifically formulate extraction plans. Currently, there is a lack of interaction analyses, so we took the shale gas reservoir core in Fuling, Sichuan Basin, as the research object and carried out simultaneous tests of shale self-absorption and conductivity and the correlation between natural seepage and ion diffusion with the help of elemental geochemical measurements. The study concludes that self-absorption and ion diffusion have synchronous response characteristics, and self-absorption develops significantly in the early stage and then tends to stabilize gradually; the presence of cavities or clay-type hydrolysis-prone minerals in the shale pore space leads to a step-like pause in the absorption and conductivity curves at the specific self-absorption time.

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Section: Background Of the Studymentioning

confidence: 99%

Correlation between Natural Seepage and Ionic Diffusion in Shales

Yang,

Liu

2024

Energy Fuels

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“…Coal-bed methane, shale gas, and tight sandstone gas are abundant in coal measure formations and have been of considerable interest to the energy industry in recent years. , Effective joint exploitation of coal measure gas resources is of great significance for promoting energy revolution and low-carbon green development . At present, many field tests have been carried out to develop gas exploitation through single reservoirs by using fracturing techniques. − However, the joint exploitation of the gas through multi-reservoirs through fracturing techniques is still in its early stages.…”

Section: Introductionmentioning

confidence: 99%

Cracks Propagation and Permeability Enhancement Caused by Supercritical CO₂ and Water Fracturing in Natural Coal–Rock Combination

Wu,

Luo,

Chen

et al. 2024

Energy Fuels

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Coal-bed methane (CBM), shale gas, and tight sandstone gas are abundant in coal measure formations. In order to achieve the joint exploitation of the gas through multilayers, the penetrating fracturing, achieving crack propagation across different layer interfaces, was used to increase the overall permeability of coal measure formations. The true triaxial tests were conducted to investigate the crack propagation through the natural coal−rock combination with using supercritical CO 2 (ScCO 2 ) and hydraulic fracturing. The morphological characteristics of crack propagation within the coal after fracturing were analyzed. Meanwhile, the fracturing-induced anisotropic permeability within the natural coal−rock combination was explored. The main results showed that (1) compared with hydraulic fracturing, ScCO 2 fracturing is beneficial to the cracks crossing the interface into coal and forming a complex fracture network. (2) After hydraulic fracturing, the permeability parallel to and perpendicular to the bedding plane are 22.5 and 21.9 times higher than that before fracturing, respectively. Compared to hydraulic fracturing, the ScCO 2 fracturing induced a larger increase, 40.3 and 39.6 times, respectively. (3) The anisotropic ratio of the permeability parallel to and perpendicular to the bedding plane is 2.01, and after ScCO 2 and hydraulic fracturing, it becomes 2.05 and 2.15, respectively. In addition, both sides of the main crack (along the bedding plane) showed an evident increase in the permeability. The results indicate that ScCO 2 fracturing brings a larger permeability enhancement of the natural rock−rock combination compared to that of hydraulic fracturing.

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“…Important discoveries were made successively in some organic-rich continental shale formations. These included the Permian Lucaogou Formation in the Jimusar Sag of the Junggar Basin [3][4][5][6], the 7 3 Sub-member of the Triassic Yanchang Formation in the Ordos Basin [7,8], the Second Member of the Paleogene Kongdian Formation in the Cangdong Sag at the center of the Bohai Bay Basin [9,10], the Third and Fourth Members of the Paleogene Shahejie Formation in the Boxing Sag, the Niuzhuang Sag, and the Bonan Sag of the Jiyang Depression [11][12][13], the First and Second Members of the Cretaceous Qingshankou Formation in the Songliao Basin [14][15][16][17][18], and the Jurassic shales in the northeastern Sichuan Basin [19,20]. These shale formations show bright prospects for the development of continental shale oil.…”

Section: Introductionmentioning

confidence: 99%

Classification and potential of continental shale oil resources in China and resource evaluation methods and criteria

Mi,

Guo,

Zhang

et al. 2023

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Continental shale oil resource is an important alternative source for increasing and stabilizing China's crude oil production. China has abundant continental shale oil resources. The opinions of researchers are divided over the classification of shale oil resources in China, resource evaluation methods and criteria, and resource potential prediction. Considering this fact, the authors of this article first summarized and analyzed the exploration progresses made in the typical shale oil exploration areas in China and the geological insights gained through exploration activities. Then, based on the current shale oil research status and actual oil production conditions in China, shale oil resources were classified into three types: interlayer shale oil, pure shale oil, and in-situ converted shale oil. Furthermore, the corresponding resource evaluation methods and quantitative models were proposed, the key parameters and their lower limits were determined and the resources of the three major types of shale oil in the shale formations in China's major basins were evaluated using a set of unified evaluation criteria. The in-place resources of pure shale oil, interlayer shale oil and in-situ converted shale oil are 145.4 × 10 8 t, 95.1 × 10 8 t and 708.2 × 10 8 t, respectively, and the recoverable resources are respectively 9.4 × 10 8 t, 7.1 × 10 8 t and 460.3 × 10 8 t. The research results can provide guidance for the evaluation of shale oil resources in China and the exploration planning for such resources and serve as valuable references for international peers to understand China's current status of research and development potential of shale oil.

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Theory, technology and practice of shale gas three-dimensional development: A case study of Fuling shale gas field in Sichuan Basin, SW China

Cited by 10 publications

References 10 publications

Correlation between Natural Seepage and Ionic Diffusion in Shales

Correlation between Natural Seepage and Ionic Diffusion in Shales

Cracks Propagation and Permeability Enhancement Caused by Supercritical CO₂ and Water Fracturing in Natural Coal–Rock Combination

Classification and potential of continental shale oil resources in China and resource evaluation methods and criteria

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Theory, technology and practice of shale gas three-dimensional development: A case study of Fuling shale gas field in Sichuan Basin, SW China

Cited by 10 publications

References 10 publications

Correlation between Natural Seepage and Ionic Diffusion in Shales

Correlation between Natural Seepage and Ionic Diffusion in Shales

Cracks Propagation and Permeability Enhancement Caused by Supercritical CO2 and Water Fracturing in Natural Coal–Rock Combination

Classification and potential of continental shale oil resources in China and resource evaluation methods and criteria

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Cracks Propagation and Permeability Enhancement Caused by Supercritical CO₂ and Water Fracturing in Natural Coal–Rock Combination