摘要
探讨鄂尔多斯盆地陇东地区长9油层组砂岩成岩作用对储层物性的影响及孔隙演化模式。通过薄片鉴定、扫描电镜、X射线衍射、钻井岩心、孔渗测定等手段,对陇东地区长9油层组砂岩储层的岩石特征、成岩作用及孔隙演化进行研究。研究区长9油层组砂岩储层处于中成岩阶段A-B期,岩石类型主要为岩屑长石砂岩、长石岩屑砂岩,成分成熟度与结构成熟度均较低,为典型的中-低孔、低渗砂岩储层。主要成岩作用类型有压实作用、胶结作用、交代作用及溶蚀作用。通过对砂岩储层的原始孔隙度进行定量恢复,结果表明胶结作用导致储层孔隙损失约11.8%;而压实作用导致孔隙的损失达14.22%～25.37%,是造成原始孔隙度降低主要原因;后期的溶解作用及交代作用对改善储层孔隙度具有一定的建设性作用。
Such methods as thin section identification,scanning electron microscope,X-ray diffraction,logging of drilling core and measurement of porosity and permeability are used to study the rock characteristics,diagenesis and pore evolution of the Chang 9 sandstone reservoir in Longdong area of Ordos Basin and to discuss the influence of diagenesis on reservoir physical properties and pore evolution pattern.The results show that the lithology of Chang 9 reservoir are mainly composed of lithic feldspar sandstone and feldspar sandstone with lower composition maturity and structural maturity,characteristic of typical medium to low porosity and low permeability sandstone reservoirs.It reveals that the Chang 9 sandstone reservoir in the study area is in the A-B stage of the middle diagenetic stage and the main types of diagenesis include compaction,cementation,metasomatism and dissolution.Cementation and compaction are major factor resulting in the decrease of porosity in the rocks.In fact,the quantitative restoration of the original porosity of the sandstone reservoirs indicates that cementation leads to 11.8%loss of porosity and compaction leads to 14.22%~25.37%loss of porosity in the sandstone reservoir in the study area.However,late stage dissolution and metasomatism play a construction role in the improvement of reservoir porosity.
作者
陈威振
田景春
吕玉娟
刘玄春
王峰
余威
冯凯龙
滕骥
CHEN Weizhen;TIAN Jingchun;L Yujuan;LIU Xuanchun;WANG Feng;YU Wei;FENG Kailong;TENG Ji(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;Oil Production Plant,PetroChina Changqing Oilfield Company,Qingyang 745100,China;Chongqing Fanjia Shareholding Co.,Ltd.,Chongqing 400060,China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第3期342-353,共12页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家科技重大专项(2016ZX05046-005-001)
四川省教育厅重点项目(16ZA0103)
成都理工大学沉积地质学科研创新团队项目(KYTD201703)
