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岩石学特征是判断油气储层性质的重要标志,也是进行有利储层划分的重要基础。通过岩芯观察和描述,结合岩石薄、片铸体薄片、扫描电镜等资料,对吉木萨尔凹陷东斜坡梧桐沟组吉7井区储层特征进行了综合分析研究。结果表明:根据研究区梧桐沟组吉7井区取芯段87块岩石薄片观察及统计得出研究区砂岩为岩屑砂岩和长石质岩屑砂岩为主。胶结物中碳酸盐岩矿物组分以泥质、方解石、铁方解石和白云石组合为特征。胶结类型主要以接触-孔隙型、孔隙型、孔隙-压嵌型等胶结方式,胶结程度表现为致密和中等致密。支撑类型主要为颗粒支撑,颗粒间主要点接触为主。孔隙类型以剩余粒间孔为主。
Petrology is an important indicator to judge the nature of oil and gas reservoirs and also an important foundation for favorable reservoir division. Based on the observation and description of the core, combined with the information of thin rock, thin cast film, scanning electron microscope and other data, the reservoir characteristics of Ji 7 well in Wutonggou Formation in east slope of Jimusar Sag have been comprehensively analyzed. The results show that: According to the observation and statistics of 87 rock fragments in the core section of Ji 7 well in Wutonggou Formation in the study area, it is concluded that the sandstone in the research area is dominated by lithic sandstone and feldspathic lithic sandstone. Carbonate minerals in the cements are characterized by a combination of argillaceous, calcite, calcitic calcite and dolomite. The types of cementation are mainly cemented by contact-pore type, pore type and pore-pressure type, and the degree of cementation is dense and moderately dense. The main types of support for the particle support, the main point of contact between the particles. The pore type is dominated by the remaining intergranular pores.