安塞油田候市地区长61油层沉积微相研究

候市地区是安塞油田的一个主力区块,区域构造是平缓的西倾单斜,长61油层为其主力产层。根据岩心、粒度、薄片及测井曲线等资料,运用沉积学理论将研究区长61油层确定为三角洲前缘亚相沉积环境,进一步识别出水下分流河道、河口砂坝、远砂坝、前缘席状砂以及水下分流河道间等五种微相。在此基础上结合物性以及试油成果,确定物性及含油性最好是水下分流河道,河口砂坝次之,前缘席状砂相对较差。

Sedimentary Microfacies Of Chang-61 Reservoir In Houshi District, Ansai Oilfield

Houshi district is one of the important oil field in Ansai oil fields whose regional tectonics are westdipping monoclinal layers,and the Chang-6_1 oil reservoirs are the chief production zones.The analyses on core,grain size,thin section,shape of the log curves show that pre-delta deposition is the main sedimentary system of Chang6_1 in Honshi district,Ansai oilfield.The main sedimentary microfacies including submerged distributary channel,debouch bar,distal bar,front sand sheet and interdistributary deposits were divided.According to the core analysis and well-test results,the submerged distributary channel was believed to be the main reservoir microfacies,debouch bar was the poor reservoir,and front sand sheet was worse reservoir relatively in this area.