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Differences in and factors controlling organic matter enrichment in the ziliujing formation shale in the Sichuan Basin

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Petroleum Science 2024年第1期21卷 77-86页

作者： Peng Li Zhong-Bao Liu He Bi Tao Jiang Rui-Kang Bian Peng-Wei Wang Xiao-Yu Shang State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development Beijing102206China Key Laboratory of Shale Oil/Gas Exploration and Production Technology SINOPECBeijing102206China Petroleum Exploration and Production Research Institute SINOPECBeijing102206China Research Institute of Petroleum Exploration and Development PetroChinaBeijing100083China Chinese Academy of Geological Sciences Beijing100037China No.4 Oil Production Plant in Daqing Oilfield Co Ltd. Daqing163511HeilongjiangChina

Lacustrine shale oil and gas are important fields for unconventional exploration and development in China,and organic-rich shale deposition lays down the critical foundation for hydrocarbon *** are two sets of shale,the Dongyuemiao and Da’anzhai Members,in the ziliujing formation in the Sichuan *** identify the differential enrichment characteristics of organic matter and clarify its controlling factors,geochemical analyses of organic and inorganic geochemical analyses were *** results showed that the total organic carbon content of the Dongyuemiao shale(1.36%)is slightly higher than that of the Da’anzhai shale(0.95%).The enrichment of organic matter in the two shales resulted from the comprehensive controls of paleoproductivity,paleoenvironment,and terrigenous input,but different factors have different *** addition,driven by climate,the change in the sulfate concentration in the bottom water further led to the different intensities of bacterial sulfate reduction in early *** made a great difference regarding organic matter accumulation in the two *** general,climate may have played a dominant role in organic matter enrichment in the two sets of shale.

关键词： Lacustrine shale ziliujing formation Sichuan Basin Enrichment mechanism of organic matter

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Anti-drilling ability of ziliujing conglomerate formation in Western Sichuan Basin of China

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Petroleum 2023年第1期9卷 41-52页

作者： Nian Peng Tianshou Ma Gongsheng Zhu Qiang Su State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Drilling&Production Engineering Technology Research Institute CNPC Chuanqing Drilling Engineering Co.Ltd.Guanghan618300China Engineering Technology Research Institute PetroChina Southwest Oil&Gas Field CompanyChengdu610052China

The conglomerate rock is usually featured by strong heterogeneity,high abrasiveness,and poor drillability due to its complex composition and texture,which brought a huge challenge for drilling *** order to guide the drill bit selection and high-efficiency drilling,the physical,mechanical,and drillability characteristics were investigated for conglomerate rock that collected from the lower Jurassic ziliujing formation in the Western Sichuan Basin of *** mineral composition,SEM micro-structure,P-and S-wave velocities,uniaxial and triaxial compressive testing,drillability,abrasiveness were systematically tested and *** mechanical properties and anti-drilling ability of ziliujing formation were proposed for a typical deep well of S-07,and the distribution characteristics were *** results indicated that the ziliujing rock is rich-in quartz and clay minerals,due to the co-existing of strong quartz gravel and weak argillaceous cement,the ziliujing rock shows strong *** relationships are roughly linear among UCS,drillability,and grinding weight loss with P-wave *** Young's modulus,UCS,internal friction angle,drillability,and abrasiveness meet the Weibull distribution pattern,while only the Poisson's ratio meets the Kernel Smooth distribution *** interpretation results reval that the ziliujing formation has the Young's modulus of 38.61±17.08 GPa,the Poisson's ratio of 0.327±0.006,the internal friction angle of 49.21±11.00°,the drillability of 8.04±1.54,and the abrasiveness grade of 4.32±*** mechanical properties and anti-drilling ability of logging interpretation are in good agreement with the experimental *** ziliujing formation is a kind of hard rock with strong heterogeneity,high strength,poor drillability,and medium *** on the characteristics of ziliujing formations,the SV516TAUL PDC bit with non-planar cutters was selected for the field application due to the good abrasion resi

关键词： Conglomerate rock ziliujing formation Mechanical properties Drillability Drill bit selection

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