板桥凹陷沙三段成岩作用及其对储层的影响

Diagenesis of Sha 3 member and its effects on reservoir in Banqiao Sag

通过对大量铸体薄片及部分普通薄片的分析鉴定,结合扫描电镜、阴极发光和黏土矿物X衍射分析,对板桥凹陷沙三段储层的成岩作用、成岩序列等进行了研究。结果表明:板桥凹陷沙三段成岩作用以胶结作用、交代作用和溶解作用为主,其中溶解作用对储层物性的改善起积极作用。在有机质演化及黏土矿物演化的基础上,对板桥凹陷的成岩阶段进行了划分,并认为沙三段主要处于中成岩A期和B期。同时通过多因素的叠合分析开展了储层综合评价,为油田深层油气勘探提供了依据。

Bymeans of casting thin sections and part of the ordinary thin sections and combined with scanning electronic microscope,cathodeluminescence and claymineral X-ray diffraction analysis method,the diagenesis,diagenetic sequence of the third member of Shahejie Formation in Banqiao Sag were analyzed.The result shows that diagenesis is mainly of cementation,metasomatism and dissolution.On the basis of the evolution of organic matter and clay minerals,the diagenetic stage ofBanqiao Sag is divided,and Sha 3 member is mainly in middle diagenetic Aand B stage.Dissolution is constructive for reservoir properties.Throughmulti-factor analysis,the comprehensive reservoir evaluation was carried out,which provides foundation for the deep oil and gas exploration.