摘要:
根据岩心观察并结合铸体薄片、扫描电镜、粒度分析和测井资料,划分了安塞油田王侯杏坪地区长6油层长62、长63小层沉积微相类型,分析了沉积演化、沉积相与油气分布关系。结果表明:研究区以湖泊河控三角洲前缘亚相为主,发育水下分流河道、水下分流间湾、前缘席状沙和水下天然堤等沉积微相,骨架砂体为水下分流河道沉积;受河道迁徙冲刷影响,水下分流河道和分流间湾相间分布,形成研究区主要生储盖组合;沉积相对长6油层下段油藏分布起主要控制作用,油气聚集主要受分流河道砂体展布控制,储层发育的水下分流河道砂体是该区今后勘探的主要目标。
Abstract:
The present paper deals,on the basis of cores,cast sections,SEM,grain-size analysis and well logs,with the sedimentary microfaciestypes,sedimentary facies evolution and its bearings on the hydrocarbon distribution in the lower member of the Chang-6 oil measures in the Wangyao-Houshui-Xinghe-Pingqiao zone,Ansai Oil Field.The sedimentary facies in the study area is involved in the stream-dominated delta subfacies in the lacustrine environment,including the subaqueous distributary channel,subaqueous interdistributary bay,frontal sand sheet and natural levee microfacies.The hydrocarbon accumulation is controlled by the subaqueous distributary channel sandstones,which may be regarded as the target for further exploration of oil and gas.
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