安塞地区长8段储层成岩作用及孔隙定量演化  

Diagenesis and Pore Evolution of Chang 8 Reservoir in Ansai Area

作　　者：龚金祥 廖明光[1] 孙博[2] 蒋汶卓 陈艺娴 GONG Jin-xiang;LIAO Ming-guang;SUN Bo;JIANG Wen-zhuo;CHEN Yi-xian(Southwest Petroleum University,Chengdu 610500,China;The 2nd Oil Prod ction Plant,Changqing Oilfield Company,PetroChina,Qingyang 745100,China)

机构地区：[1]西南石油大学地球科学与技术学院,四川成都610500 [2]中国石油天然气股份有限公司长庆油田分公司第二采油厂,甘肃庆阳745100

出　　处：《河北地质大学学报》2024年第4期26-33,48,共9页Journal of Hebei Geo University

摘　　要：通过铸体薄片鉴定、扫描电镜分析等方法,在储层基本特征、成岩作用与成岩序列分析的基础上,对安塞地区长8段储层的孔隙演化进行定量分析,建立储层孔隙演化模式。研究表明:压实作用对储层的破坏性最强,是储层致密的主要原因,减孔67.56%;胶结作用减孔23.65%,是储层在中成岩A期达到致密的关键;溶蚀作用则对储层物性具有一定的改善作用,在一定程度上延缓储层致密化的进程,增孔1.47%。孔隙演化在早成岩A期经历了快速压实—早期胶结阶段,在早成岩B期经历了压实减缓—早期溶蚀阶段,在中成岩A期经历了溶蚀—胶结致密阶段。该研究为安塞地区长8油层组下一步勘探开发提供依据。Based on the analysis of reservoir basic characteristics,diagenetic processes,and diagenetic sequences through methods such as thin section identification and scanning electron microscope analysis,the pore evolution of the Chang 8 reservoir in the Ansai area was quantitatively analyzed and a reservoir pore evolution model was established.The research indicates that compaction is the most destructive to the reservoir,being the primary cause of its tightness,reducing porosity by 67.56%.Cementation reduces porosity by 23.65%and is the key factor in achieving tightness during the mid-diagenetic phase A.Dissolution,on the other hand,has a certain ameliorative effect on the reservoir properties,partially slowing down the process of reservoir tightness and increasing porosity by 1.47%.The pore evolution underwent a rapid compaction-early cementation stage during the early diagenetic phase A,followed by a compaction slowing-early dissolution stage in the early diagenetic phase B,and finally an erosion-cementation densification stage during the mid-diagenetic phase A.This study provides a basis for the next step of exploration and development of the Chang 8 reservoir in the Ansai area.

关 键 词：孔隙演化 成岩作用 安塞地区 延长组 鄂尔多斯盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]