渤中凹陷南部低渗透储层成岩作用及孔隙演化

Diagenesis and Pore Evolution of Low Permeability Reservoirs in Southern Bozhong Depression

王震 李敬松 刘汝敏 李换浦

WANG Zhen LI Jingsong LIU Rumin LI Huanpu

中海油田服务股份有限公司油田生产研究院, 河北燕郊 065201

Oilfield Optimization Research & Development Institute of COSL, Yanjiao Hebei 065201, China

针对渤中凹陷南部低渗透储层成岩作用以及孔隙演化规律进行理论及实践研究。根据5口探井薄片、储集层物性分析等资料,进行成岩作用和成岩过程中孔隙演化的定量分析。研究表明,渤中凹陷南部沙河街组三段以低渗储层为主,长石含量高、埋藏深度大及孔隙结构复杂等是储集层物性变差的重要因素;沙三段储层经过了压实、胶结、溶蚀及交代等成岩作用改造,目前已处于中成岩阶段A2、B亚期,其中压实作用造成原生孔隙大量丧失,是储集层物性变差的最主要原因,为认清该渤中凹陷南部储层致密原因提供了可靠依据

Theoretical and practical research has been conducted on diagenesis and porosity evolution of low permeability reservoir in southern Bozhong depression. Based on thin-section and reservoir properly data from five exploration wells, diagenesis study and quantitative analysis on pore evolution have been finished. It is shown that in southern Bozhong depression, E2S3 Fm is dominated by low permeable reservoir ,with high feldspar contents, deep buried depth and complicated pore structure, which are important factors for poor reservoir quality. Through reformation of compaction, cementation, dissolution and metasomatism, the reservoirs are now in the middle diagenesis periods of A2 and B sub-phase, during which reservoir pores were lost due to compaction, and the reservoir quality became poor. This study has provided a reliable basis for understanding the reasons of tight reservoirs in this region.

中海石油(中国)有限公司研究项目"低渗油田开发油藏及工艺方案"(SC08TJ-XSZ-071)

https://doi.org/10.3969/j.issn.1008-2336.2012.04.023