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油藏地质特征是认识与研究油藏开发的基础,是静态资料与开发动态相互验证的过程,贯穿于整个油藏开发的始终。根据岩心观察、薄片观察、地面露头观察及钻井和注水开发动态资料,对安塞油田三叠系延长组长6油层物性特征、沉积微相及油气富集规律进行研究分析。结果表明:安塞油田局部发育鼻状隆起,对油气富集起到一定的控制作用。该区储层物性较差,油气储集性能主要受成岩作用控制,研究区主要属三角洲前缘亚相沉积,油气主要储存在三角洲前缘水下分流河道、河道侧翼及河口坝体。
Reservoir geological features is the basis for understanding and researching reservoir development. It is a process of dynamic mutual verification of static data and development, which runs through the entire reservoir development. According to core observation, thin sheet observation, surface outcrop observation and dynamic data of drilling and waterflooding development, physical characteristics, sedimentary microfacies and hydrocarbon accumulation regularities of Chang 6 reservoir of Triassic Yanchang Formation in Ansai Oilfield were studied. The results show that the nose formation in Ansai oilfield locally plays a role in controlling oil and gas accumulation. The reservoirs in this area are poor in physical property and hydrocarbon reservoir performance is mainly controlled by diagenesis. The study area mainly belongs to the delta front deposition. The hydrocarbons are mainly stored in delta front distributary channel, river flank and estuary dam.