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
龚金祥 1廖明光 1孙博 2蒋汶卓 1陈艺娴1
作者信息
- 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
- 折叠
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.
Abstract
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Key words
pore evolution/diagenesis/Ansai area/Yanchang Formation/Ordos Basin引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据