Characteristics and significance of the penecontemporaneous karst in lacustrine carbonate, Da'anzhai Member, Lower Jurassic, Beibei area, eastern Sichuan Basin
作者机构：State Key Laboratory of Oil and Gas Reservoir Geology and ExploitationSouthwest Petroleum UniversityChengdu610500China The Sedimentary and Accumulation Department of Key Laboratory of Carbonate ReservoirsPetroChinaSouthwest Petroleum UniversityChengdu610500China School of Geoscience and TechnologySouthwest Petroleum UniversityChengdu610500China Exploration and Development Research Institute of PetroChina Southwest Oil&Gas Field CompanyChengduSichuan 610041China
出 版 物：《Petroleum》 (油气（英文）)
年 卷 期：2017年第3卷第3期
页 面：292-300页
学科分类：081803[工学-地质工程] 0709[理学-地质学] 0819[工学-矿业工程] 0808[工学-电气工程] 08[工学] 0820[工学-石油与天然气工程] 0817[工学-化学工程与技术] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0816[工学-测绘科学与技术] 0827[工学-核科学与技术] 0813[工学-建筑学] 0703[理学-化学] 0814[工学-土木工程]
基 金：This study was supported by Unconventional Oil&Gas Scientific Research Innovation Team Building Project Universities Affiliated to Sichuan Province(Provincial Teaching Designed 127 Education Office of Sichuan Province).
主 题：Sichuan Basin Da'anzhai Member Lacustrine carbonate Penecontemporaneous karst Tight reservoir
摘 要：There are few reports about the penecontemporaneous karst of the lacustrine carbonate of Da anzhai Member which developed on the top of Lower Jurassic Ziliujing Formation,eastern Sichuan Basin.Based on the analysis of the macroscopic and microscopic characteristics of Heping Reservoir section in Beibei area,It is discovered that the penecontemporaneous karst in the lacustrine carbonate,Da anzhai Member,and its characters as follows:(1)The dissolved fractures and karrens are common,which have been filled with vadose silts,bioclasts,terrigenous quartzes,crystal and intergrown calcites;(2)The penecontemporaneous karstification mainly occurs in the micrites and shell limestones of the middle and upper part of the shallowing-upward sequence,and the desiccation cracks occur in some shallowing-upward sequences;(3)Three meteoric-water diagenetic lenses are identified in this section.By further study we also find the factures,stylolite and burial dissolution pores occur along the karst system(tubes,conduits and caves of the karst).And the asphalt not only fills the stylolites and fractures,but also is mixed with the vadose silt in the karst system,although the pore space formed by penecontemporaneous karstification is filled with vadose material and cements.Therefore it is concluded that the development and modification of the tight lacustrine carbonate reservoir of Da anzhai Member,to some extent,are relevant with the penecontemporaneous karstification,and the penecontemporaneous karst reservoir may develop in the buried Da anzhai carbonate of the basin.
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