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大港探区扣村潜山带二叠系优质砂岩储层成因机制
孙沛沛1,操应长1,2,周立宏3,远光辉1,2,靳子濠1,吴智平1,张飞鹏3,付立新3,李宏军3,楼达3,李玉海4,王文庆4
(1.中国石油大学(华东)地球科学与技术学院,山东青岛 266580;2.青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛 266071;3.中国石油大港油田公司,天津 300280;4.中石油东方地球物理公司研究院大港分院,天津 300280)
摘要:
综合利用岩心观察、薄片鉴定、阴极发光分析、扫描电镜观察、碳氧同位素及氢氧同位素组成分析、压汞及岩石物性测试等技术方法,结合埋藏演化史和油气充注史,对大港探区扣村潜山带二叠系砂岩储层进行研究。研究表明:扣村潜山带二叠系优质砂岩储层以高成分成熟度、较高的结构成熟度为特征,优质储层储集空间以次生粒间孔及粒内孔为主;在构造运动的控制下,成岩作用演化序列依次为压实作用—早期菱铁矿胶结作用—长石溶蚀/自生高岭石胶结—长石溶蚀、自生高岭石沉淀/少量自生石英—晚期铁方解石胶结;优质储层的发育受多种因素控制,高成熟度的中粗砂岩是优质储层形成的物质基础,两次地层抬升剥蚀导致的长期大气淡水淋滤作用形成大量次生孔隙是优质储层发育的关键,晚期地层浅埋藏弱压实有利于次生孔隙的保存;重力作用下的地层水下降流促使砂岩中的储集物性分异,潜山顶部溶蚀产物随水流动,在此过程中逐渐沉淀,形成了自潜山顶部向山腰依次发育的溶解带、过渡带与沉淀带。
关键词:  成因机制  成岩作用  砂岩储层  二叠系  大港探区
DOI:10.3969/j.issn.1673-5005.2022.02.002
分类号::TE 122.2
文献标识码:A
基金项目:国家自然科学基金项目(41872140,41821002); 泰山学者青年专家项目(tsqn201909061);青岛海洋科学与技术试点国家实验室山东省专项经费(2021QNLM020001) 
Genetic mechanisms of high quality sandstones reservoirs in Permian of Koucun buried hill, Dagang exploration area
SUN Peipei1, CAO Yingchang1,2, ZHOU Lihong3, YUAN Guanghui1,2, JIN Zihao1, WU Zhiping1, ZHANG Feipeng3, FU Lixin3, LI Hongjun3, LOU Da3, LI Yuhai4, WANG Wenqing4
(1.School of Geosciences in China University of Petroleum(East China), Qingdao 266580, China;2.Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;3.Exploration and Development Research Institute, Dagang Oilfield Company, Tianjin 300280, China;4.Dagang Branch of GRI, BGP Incorporated Company, CNPC, Tianjin 300280, China)
Abstract:
Combined with the history of burial evolution, organic matter thermal evolution and hydrocarbon charge, genetic mechanisms of the sandstones reservoirs in the Permian of Koucun buried hill were investigated,based on a series of analyses including core observation, thin section examination, cathode luminescence analysis, scanning electron microscopy, fluid inclusions, carbon and oxygen isotope, hydrogen and oxygen isotopes, mercury penetration, porosity-permeability test. The results show that the reservoirs in the Permian of Koucun buried hills are characterized by a high compositional maturity and a relatively high textural maturity, and the porosity types are mainly secondary pores. Under the control of tectonic movements, the diagenetic sequence includes successive compaction, early siderite cementation, early feldspar dissolution accompanied by authigenic kaolinite precipitation, late feldspar dissolution accompanied by quartz overgrowth and authigenic kaolinite precipitation, and late carbonate cementation. High quality sandstones reservoirs are controlled by multiple factors. Medium-coarse sandstone of high maturity made up the favorable material foundation of reservoirs, multi-stage dissolution is the key element to form reservoirs, and weak compaction after dissolution effectively preserved the secondary pores. The formation water flew under gravity, and differentiated the physical property of the reservoir. As a result, the areas of dissolution, transition and precipitation are located from the top of buried hill to the hillside successively.
Key words:  genetic mechanisms  diagenesis  sandstones reservoirs  Permian  Dagang exploration area
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