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在前人沉积相研究的基础上,根据铸体薄片观察、扫描电镜、压汞等相关测试资料,对鄂尔多斯盆地东南部延长组长6储层特征进行研究,并采用透射光和荧光显微镜相结合的方法,对流体包裹体特征进行分析,探讨长6油藏的成藏特征。结果表明:鄂尔多斯盆地东南部延长组长6储层以长石砂岩和岩屑长石砂岩为主,储层物性差,岩性较致密,填隙物以铁方解石和水云母为主,储层孔隙空间以残余粒间孔和溶蚀孔隙为主,喉道类型为微喉道;包裹体测温分析表明研究区长6油藏石英内流体包裹体烃类多形成在早白垩世,距今105~125 Ma之间;烃类主要在残余粒间孔和溶蚀孔隙等处聚集成藏,后期的胶结及破裂作用对油气的二次运移起到关键作用。
Based on the previous study of sedimentary facies, the characteristics of Chang 6 reservoir of Yanchang Formation in the southeast Ordos Basin were studied based on the observation data of cast thin sections, scanning electron microscopy and mercury intrusion, and the combination of transmitted light and fluorescence microscope The characteristics of fluid inclusions are analyzed to discuss the reservoir forming characteristics of Chang 6 reservoir. The results show that the Chang 6 reservoir of the Yanchang Formation in the southeast Ordos Basin is dominated by feldspar sandstone and feldspathic feldspar sandstone with poor reservoir properties and tight lithology. The interstitial materials are dominated by iron calcite and hydromica, The pore space is dominated by remnant intergranular pores and dissolved pores, and the throat type is micro throat. The temperature measurement of the inclusions shows that the hydrocarbon inclusions in the fluid inclusions in Chang 6 reservoir of the study area were formed in the Early Cretaceous, ~ 125 Ma. Hydrocarbons mainly accumulate in reservoirs such as residual intergranular pores and dissolved pores, and cementation and fracture in the later stage play a key role in the secondary migration of oil and gas.