准噶尔盆地车拐地区侏罗系八道湾组储层成岩作用特征分析

通过岩心、薄片、扫描电镜、测井、录井及稳定同位素分析，研究了准噶尔盆地西北缘车拐地区侏 罗系八道湾组储层的储集空间类型，认为研究区的砾岩主要发育原生粒间孔、次生粒内溶孔及构造裂缝， 砂岩主要发育原生粒间孔、次生粒间溶孔及粒内溶孔。在此基础上，对研究区侏罗系八道湾组储层经历的 压实作用、胶结作用、溶蚀作用等主要成岩作用的特征进行了研究，发现侏罗系八道湾组砂岩和砾岩都处 于晚成岩阶段A 期和B 期。总结了不同成岩作用对储层储集空间和储层物性的影响机理：压实作用造成 储层储集空间减少、物性变差；胶结作用一方面充填储集空间，降低储层物性，另一方面成为支撑颗粒骨 架，减弱压实作用的影响，同时在成岩作用晚期为溶蚀作用的发育提供物质基础；溶蚀作用是产生次生孔 隙和裂缝，并具有连通作用的最重要的建设性成岩作用。

Reservoir diagenesis characteristics of Jurassic Badaowan Formation in Che-Guai area,Junggar Basin

Based on well-core observation,slice,SEM,logging data and stable isotope analysis,the reservoir accumulating space types of Jurassic Badaowan Formation in Che-guai area,northwestern margin of Junggar Basin,are well studied.It is considered that conglomerate in the study area mainly developed primary intergranular pores,secondary intragranular dissolved pore and structural fractures;sandstones in the study area mainly developed primary intergranular pores,secondary intergranular dissolved pore and intragranular dissolved pore.The diagenesis characteristics of compaction,cementation and dissolution are studied.Conglomerate and sandstone of Jurassic Badaowan Formation are in stages A and B of late diagenetic stage.In addition,different diagenesis have different influential mechanism on reservoir space types and physical properties.Compaction can decrease the reservoir accumulating space,and makes the reservoir physical properties become worse.On the one hand,cementation can fill up the reservoir accumulating space,and make the reservoir physical properties become worse,on the other hand,it can support grain skeleton and decrease the influence of compaction,meanwhile,it can provide material for dissolution at the late diagenetic stage.Dissolution is a constructive communicating diagenesis,and it can produce secondary pores and fractures.