致密砂岩储层成岩作用及其控制因素分析——以塔里木盆地顺托果勒地区志留系柯坪塔格组下段为例  

Diagenesis and controlling factors of tight sandstone reservoirs:A case study of the lower member of Silurian Kepingtage Formation in Shuntuoguole area,Tarim Basin

作　　者：张涵冰[1] 彭军[1] 杨素举[2] 鲁明 夏青松[1] 李斌[1] 

机构地区：[1]西南石油大学地球科学与技术学院,成都610500 [2]中国石化西北油田分公司勘探开发研究院,乌鲁木齐830011 [3]中国石油华北油田勘探开发研究院,河北任丘062552

出　　处：《石油实验地质》2016年第4期543-550,共8页Petroleum Geology & Experiment

基　　金：国家科技重大专项"塔里木盆地碎屑岩层系大中型油气田富集规律与勘探方向"(2011ZX05002-003)资助

摘　　要：利用岩心观察、薄片鉴定、扫描电镜、X-衍射及包裹体测温等方法,对塔里木盆地顺托果勒地区志留系柯坪塔格组下段致密砂岩储层进行了研究,认为该储层以细粒岩屑砂岩为主,物性较差;发育压实作用、胶结作用、溶蚀作用、交代作用、构造破裂作用等5种成岩作用类型。压实作用是储层物性变差的最主要原因,溶蚀作用是改善储层物性的关键;成岩阶段处于中成岩A期,局部已达到中成岩B期;成岩作用受到多方面因素的影响,沉积环境及碎屑成分主要控制了压实作用及溶蚀作用的强弱,埋藏史和地温场从宏观上控制着成岩作用的发育程度,烃类充注从微观上减缓了胶结作用速率,并促进易溶组分的溶蚀。Tight sandstone reservoirs in the lower member of Silurian Kepingtage Formation in Shuntuoguole area of the Tarim Basin were studied through core observation, thin section identification, scanning electron microscopy, X-ray diffraction and fluid inclusion homogenization temperatures. They mainly consist of fine-grained debris sand-stones with poor physical properties. Five types of diagenetic effects occurred, including compaction, cementation, erosion, metasomatism, and tectonic fracturing. Compaction made the reservoir physical properties become poorer, while erosion improved them. They are mainly within the middle diagenesis stage A, and locally in the middle dia-genesis stage B. Diagenetic effects were dominated by many factors. Sedimentary environment and debris predomi-nated the degree of compaction and erosion, burial history and temperature macroscopically controlled diagenesis development, while hydrocarbon charging microscopically reduced the cementation rate and enhanced the erosion of soluble components.

关 键 词：成岩作用 致密砂岩 柯坪塔格组下段 志留系 顺托果勒地区 塔里木盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]