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Characterization of 3D pore nanostructure and stress-dependent permeability of organic-rich shales in northern Guizhou Depression,China

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第2期14卷 407-422页

作者： Xiaofang Jiang Shouchun Deng Haibo Li Hong Zuo State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China

The three-dimensional(3D)pore structures and permeability of shale are critical for forecasting gas production capacity and guiding pressure differential control in practical reservoir ***,few investigations have analyzed the effects of microscopic organic matter(OM)morphology and 3D pore nanostructures on the stress sensitivity,which are precisely the most unique and controlling factors of reservoir quality in *** this study,ultra-high nanoscale-resolution imaging experiments,*** ion beam-scanning electron microscopy(FIB-SEMs),were conducted on two organic-rich shale samples from longmaxi and wufeng formations in northern Guizhou Depression,*** morphology,porosity of 3D pore nanostructures,pore size distribution,and connectivity of the six selected regions of interest(including clump-shaped OMs,interstitial OMs,framboidal pyrite,and microfractures)were qualitatively and quantitatively *** decay permeability(PDP)measurement was used to investigate the variation patterns of stress-dependent permeability and stress sensitivity of shales under different confining pressures and pore pressures,and the results were then used to calculate the Biot coefficients for the two shale *** results showed that the samples have high OM porosity and 85%of the OM pores have the radius of less than 40 *** OM morphology and pore structure characteristics of the longmaxi and wufeng formations were distinctly *** particular,the OM in the wufeng formation samples developed some OM pores with radius larger than500 nm,which significantly improved the *** macroscopic permeability strongly depends on the permeability of OM *** stress sensitivity of permeability of wufeng formation was significantly lower than that of longmaxi formation,due to the differences in OM morphology and pore *** Biot coefficients of 0.729 and 0.697 were obtained for the longmaxi and wufeng formations,respectively.

关键词： Focused ion beam scanning electron microscopy(FIB-SEM) Three-dimensional(3D)reconstruction Pulse decay permeability(PDP) Stress sensitivity wufeng-longmaxi formation

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Gas-in-Place(GIP) Variation and Main Controlling Factors for the Deep wufeng-longmaxi Shales in the Luzhou Area of the Southern Sichuan Basin,China

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Journal of Earth Science 2023年第4期34卷 1002-1011页

作者： Wei Wu Peng Cheng Shenyang Liu Chao Luo Haifeng Gai Haitao Gao Qin Zhou Tengfei Li Kesu Zhong Hui Tian Research Institute of Shale gas PetroChina Southwest Oil and Gas FieldsChengdu 610002China State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China CAS Center for Excellence in Deep Earth Science Guangzhou 510640China

The wufeng-longmaxi formation shales with burial depths > 3 500 m in the southern Sichuan Basin are believed to have large shale gas ***,the reservoir properties and gasin-place(GIP) contents of these shales exhibit variations across different *** this study,a set of wufeng-longmaxi shales with burial depths of 4 000–4 200 m was derived from the Well Y101H2 in the Luzhou area,and the differences in geological and geochemical characteristics,porosity,water saturation and GIP content of various sublayer shales were *** results indicate that the TOC content and effective porosity of the upper(LMX1-4) and lower(LMX1-3) sublayer shales of the first member of the longmaxi formation are better than those of the wufeng formation(WF) shales,which results in the LMX1-4 and LMX1-3 shales having higher GIP contents than the WF *** GIP contents of the LMX1-3 shales are higher than those of the LMX1-4 shales,and this is likely because the organic matter of the LMX1-3 shales had more aquatic organisms and was preserved in a stronger reductive environment,which leads to a stronger gas generation *** contrast to the middle-shallow LMX1-4 shales in the Sichuan Basin,the deep LMX1-4 shales in the Luzhou area have advantageous reservoir properties and GIP contents,and thus it is promising to synchronously exploit the deep LMX1-4 and LMX1-3 shales in some regions of the southern Sichuan Basin.

关键词： the Sichuan Basin wufeng-longmaxi formation shales deep shales reservoir proper-ties GIPcontents.

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Performance of free gases during the recovery enhancement of shale gas by CO_(2) injection:a case study on the depleted wufeng–longmaxi shale in northeastern Sichuan Basin,China

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Petroleum Science 2021年第2期18卷 530-545页

作者： Jun Liu Ling-Zhi Xie Bo He Peng Zhao Huai-Yu Ding State Key Laboratory of Hydraulics and Mountain River Engineering Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengdu610065China College of Architecture and Environment Sichuan UniversityChengdu610065China Liaohe Oilfield Company PetroChinaPanjin124010China

In this work, a novel thermal–hydraulic–mechanical (THM) coupling model is developed, where the real geological parameters of the reservoir properties are embedded. Accordingly, nine schemes of CO_(2) injection well (IW) and CH_(4) production well (PW) are established, aiming to explore the behavior of free gases after CO_(2) is injected into the depleted wufeng–longmaxi shale. The results indicate the free CH4 or CO2 content in the shale fractures/matrix is invariably heterogeneous. The CO_(2) involvement facilitates the ratio of free CH_(4)/CO_(2) in the matrix to that in the fractures declines and tends to be stable with time. Different combinations of IW–PWs induce a difference in the ratio of the free CH4 to the free CO_(2), in the ratio of the free CH_(4)/CO_(2) in the matrix to that in the fractures, in the content of the recovered free CH_(4), and in the content of the trapped free CO_(2). Basically, when the IW locates at the bottom wufeng–longmaxi shale, a farther IW–PWs distance allows more CO2 in the free phase to be trapped;furthermore, no matter where the IW is, a shorter IW–PWs distance benefits by getting more CH_(4) in the free phase recovered from the depleted wufeng–longmaxi shale. Hopefully, this work is helpful in gaining knowledge about the shale-based CO_(2) injection technique.

关键词： CO_(2)geological sequestration Enhanced shale gas recovery Free gas wufeng-longmaxi formation THM coupled modeling

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Geological Characteristics of Shale Gas in Different Strata of Marine Facies in South China

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Journal of Earth Science 2021年第4期32卷 725-741页

作者： Yufang Wang Gangyi Zhai Guoheng Liu Wanzhong Shi Yongchao Lu Juan Li Yunxiao Zhang Oil and Gas Survey China Geological SurveyBeijing 100083China Key Laboratory of Unconventional Oil and Gas Geology China Geological SurveyBeijing 100029China School of Earth Resources China University of GeosciencesWuhan 430074China

In the Middle and Upper Yangtze region of South China,there are well developed sets of marine shale *** only wufeng longmaxi shale gas has been developed in scale,while the Sinian and Cambrian shale gas are still under *** various shale strata show different characteristics in lithological features,such as lithofacies types and reservoir physical properties,which are due to the influence of tectonic pattern,sedimentary environment,and diagenesis caused by tectonic *** will affect the later fracturing technology and fracturing *** shale reservoirs of Sinian doushantuo,Cambrian Niutitang,Upper Ordovician wufeng,and the Lower Silurian longmaxi formation shale were evaluated and compared with each other with respect to their sedimentary environments,lithofacies,minerals compositions,and micro pore *** reservoir characteristics of the shale and the main control factors of shale gas enrichment were summarized in this study.

关键词： shale gas marine shale Doushantuo formation Niutitang formation wufeng-longmaxi formation reservoir characteristics comparison

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