摘要
济阳坳陷沙四段上亚段—沙三段下亚段泥页岩具有复杂的成分及结构非均质性,对其储集性控制因素尚不明确,制约了页岩油勘探进展。利用岩石薄片分析等资料将研究区以富碳酸盐为特征的泥页岩分为A—J共10种层理结构类型,以B—D类最为发育,所占比例达80%;利用岩石薄片、氩离子抛光-扫描电镜对泥页岩基质孔隙类型进行观察与综合分析,认为研究区孔隙类型主要有刚性颗粒间孔、有机质及黏土矿物收缩孔和碳酸盐晶间孔。从层理结构类型来看,G,H,B和D类储集性较好,其次为E和F类,A和C类较差,其他类型储集性更差。分析不同类型层理结构泥页岩储集性控制因素发现:碳酸盐呈泥晶结构的泥页岩,矿物成分对孔隙发育程度具有主导控制作用;碳酸盐呈晶粒结构(包含柱纤结构)的泥页岩,层理结构对储集性的控制作用较强。根据泥页岩出油井段分析结果,指出下步应以寻找碳酸盐含量为30%～50%的G,H,B和D类层理结构泥页岩为主要勘探方向,优选碳酸盐含量满足上述条件且G和H类层理结构泥页岩层段。
Mud shale in Upper Es4 to Lower Es3 Members of Jiyang Depression has complicate composition and structural heterogeneity,and controlling factors of reservoir property difference are unclear,restricting the progress of shale oil exploration.Bedding structures in mud shale characterized by rich carbonate in Upper Es4 to Lower Es3 Members of Jiyang Depression can be divided into 10 types by using thin slice analysis data.Results show that types of B,C and D are the most developed in mud shale,which proportion can reach 80%.By analyzing and observing pore types of mud shale matrix through thin section and argon ion polishing-scanning electron microscopy,the main pore types in the study area are considered to be rigid intergranular pore,organic matter and clay shrinkage pore,and carbonate intergranular pore.According to the bedding structure type,G,H,B and D have the best reservoir property,followed by E and F,A and C,and other types are the worst.By analyzing the controlling factors of mud shale reservoir property of different types of bedding structure,the mineral composition plays a leading role in controlling the degree of pore development in mud shale with muddy crystal structure carbonate.Bedding structure strongly affects the degree of pore development in mud shale with carbonate grain structure(including columnar fiber structure).According to the analysis of mud shale oil production section,it is clear that the further main exploration direction should be to turn to mud shale of G,H,B and D types with 30%-50%carbonate content,and it is preferable to consider shale sections with more concentrated G and H types with carbonate content meeting the above conditions.
作者
方正伟
张守鹏
刘惠民
滕建彬
朱丽鹏
FANG Zhengwei;ZHANG Shoupeng;LIU Huimin;TENG Jianbin;ZHU Lipeng(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;School of Geosciences,China University of Petroleum(East China),Qingdao City,Shandong Province,266580,China;Key Laboratory of Shale Oil/Gas Exploration and Production,SINOPEC,Dongying City,Shandong Province,257015,China;Key Laboratory of Sedimentary Simulation and Reservoir Evaluation,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;Oil and Gas Exploration Management Center,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257001,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2019年第1期101-108,共8页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"济阳坳陷页岩油勘探开发目标评价"(2017ZX05049-004)
国家"973"计划"中国东部古近系陆相页岩油富集机理与分布规律"子课题"陆相页岩油储集空间及发育模式"(2014CB239102)
关键词
泥页岩
层理结构
储集性
控制因素
勘探方向
济阳坳陷
mud shale
bedding structure
storage property
controlling factor
exploration direction
Jiyang Depression
