安塞油田中部长6油层组沉积相特征

Research on Sedimentary Characteristics of Chang 6 Layer in Upper Triassic Yanchang Formation, Central Ansai Oilfield

针对安塞油田中部老油区的储层地质特点,通过收集前人资料以及实际剖面和岩心分析,结合测井曲线解释,分析研究区目的层位沉积演化史,并得出安塞油田中部长6油层组主要沉积相为内陆湖泊三角洲,包括三角洲前缘亚相和前三角洲亚相,主要微相类型有水下分流河道、水下天然堤、水下分流河道间洼地、前缘席状砂、河口砂坝等,其中以水下分流河道为主。

Based on reservoir properties of old oil exploration region in central Ansai oilfield, through referring to former research data, core analysis and interpretation of logging curves, the sedimentary evolution of Chang 6 layer in this area was analyzed. The results show that the Chang 6 layer is basically inland lake delta facies including front-delta deposition and prodelta subfacies. The microfacies are varies in this region including underwater distributary channel, subsea natural barrier, interdistributary bay, frontal sheet sand and estuarine bar; underwater distributary channel plays a dominant role in study area.