川东北飞仙关组鲕滩储层成岩作用和孔隙演化

川东北飞仙关组鲕滩储层是四川盆地重要的勘探目的层,受成岩作用的改造非常强烈。通过对岩心、普通薄片、铸体薄片、阴极发光、碳氧同位素、微量元素和流体包裹体等多种资料进行综合研究,详细阐述了主要成岩作用的类型、形成机理及其产物,分析了其对储层的影响。胶结作用和压实作用是原生孔隙和部分次生孔隙的主要破坏者;混合水白云石化作用、溶蚀(岩溶)作用、破裂作用是次生孔隙的主要建造者,其产生的溶孔、溶洞和裂缝是天然气的主要储集空间和运移通道。成岩作用是储层物性的主要控制者,控制了孔隙的演化过程。

Diagenesis and pore evolution of the oolitic shoal reservoir in the Feixianguan Formation in northeastern Sichuan

The oolitic shoal reservoir in the Feixianguan Formation in the northeastern Sichuan basin, which has undergone strong diagenesis, is an important exploration target in the Sichuan basin. On the basis of an integrated analysis of all kinds of data, such as the core, common thin sections, mold thin sections, cathodoluminescence images, carbon and oxygen isotopes, trace elements and fluid inclusions, the paper deals with the main type, mechanism and product of diagenesis and analyzes the effects of diagenesis on the reservoir. Cementation and compaction were the leading destroyers of primary pores and part of secondary pores. Mixed-water dolomitization, corrosion (karstification) and rupturing were the leading builders of secondary pores and the solution pores, solution cavities and fractures produced by them are the dominant accumulation spaces and migration passageways for gas. The physical properties of the reservoir are mainly controlled by diagenesis, which controlled the evolution of pores.