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Complex genesis of multiperiod fractures in the Middle Triassic Leikoupo formation in the Pengzhou gas field, western Sichuan Basin, China

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Petroleum Science 2023年第1期20卷 161-176页

作者： Xiao-Fei Hu Hu-Cheng Deng Jian-Hua He Zhong-Min Shen Xian-Feng Peng College of Energy Chengdu University of TechnologyChengduSichuan 610059China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Chengdu University of Technology) ChengduSichuan 610059China

The cumulative expression of multistage deformation is complex multiperiod fractures,which are commonly seen in tectonic zones.The Middle Triassic Leikoupo formation in the western Sichuan Basin Depression,China,is a typical marine carbonate reservoir with natural fractures caused mainly by tectonic movements.According to outcrops,drill cores,image logging,and fluid inclusions,the fracture characteristics,types of natural fractures,and interactions of fractures are determined.In total,419 natural fractures in 493.2 m of cores from 7 wells are investigated,which are mainly shear and tensile fractures with a small number of weathering generated fractures.Meanwhile,the results of the stable isotope analysis of δ13C and δ18O,as well as the flow fluid inclusion data,reveal four tectonic periods of fractures with different occurrences.Based on the history of regional tectonic evolution,indicating one period of weathering fractures ascribable to stratal uplift and three periods of structural fractures related to the sequential tectonic movements of the Longmenshan fault belt.By analyzing the interaction relationships of fractures,three types of fracture interaction relationships are observed:cutting,restraining,and overlapping.The four stages fractures are chronologically assigned to(1)the early Indosinian N-S trending compression,(2)the late Indosinian NW-SE compression,(3)the middle Yanshanian NE-SE compression,and(4)the early Himalayan E-W compression.The influence of natural fractures on gas migration and well production in marine carbonates is discussed,and indicates that tectonic fractures could provide seepage channels for gas migration and accumulation from near or distant hydrocarbon source rocks into the Middle Triassic Leikoupo formation.This study utilizes a pragmatic approach for understanding the fracture genesis mechanism in oil and gas field with multiperiod fractures.

关键词： Multiperiod fractures Interaction relationships Genesis mechanism Gas migration Leikoupo formation Sichuan basin

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Genetic types of carbonateshoal reservoirs: A case study of the Middle Triassic Leikoupo formation in Sichuan Basin, SW China

Genetic types of carbonateshoal reservoirs: A case study of ...

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第十五届全国古地理学及沉积学学术会议

作者： Xiong Ding Han Wu Yuefeng Sun Hanghang Yu Zihao Zhao Jingshan Chen Qingsong Tang School of Geosciences and Technology Southwest Petroleum University Department of Geology and Geophysics Texas A＆M University Petro China Southwest Oil and Gasfield Company Exploration Division Chuanzhong Oil and Gas Field of Petro China Southwest Petroleum Company

Carbonate shoal reservoirs of the Middle Triassic Leikoupo formation in the Sichuan Basin were investigated for potential gas resources. The carbonate shoal reservoirs of the Leikoupo formation in Sichuan basin can be divided by their genetic mechanism into residual intergranular pore type reservoirs, karstification type reservoirs（further divided into syndepositional, burial, and supergene types）, dolomitization type, and composite type. Residual intergranular pores and dissolved pores are the main reservoir spaces in the eponymous type. Isolated intragranular corroded pores and moldic pores are the main reservoir spaces in syndepositional karstification type. Dissolved pores and holes are the main reservoir spaces in burial karstification type. Different scales of pores and caves are the main reservoir spaces of supergene karstification type. Intercrystal pores and intercrystal solution pores are the main reservoir spaces of dolomitization type. Composite type reservoirs are characterized by a variety of reservoir spaces with pores, holes, and fissures. This analysis shows that the high-quality shoal reservoirs were formed by the superposition of carbonate shoals and constructive diagenetic modification.

关键词： genetic types reservoir carbonate shoal Leikoupo formation Sichuan Basin

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