吴起油田楼坊坪区块北部长6沉积微相分析研究

Sedimentary Characteristics of Chang 6 in Northern Loufangping Area of Wuqi Oilfield

为阐明吴起油田楼坊坪区块北部长6沉积特征,在岩心观察描述的基础上,结合取心井段沉积微相分析、砂体对比分析及砂体展布特征研究认为,研究区长6发育三角洲前缘亚相,主要包括水下分流河道、分流间湾和河口坝。其中水下分流河道砂体最大,大部分处于研究区中部。长6主要分布2~3支三角洲前缘分流河道砂体,整体呈南北方向分布。结果表明,在研究区长6中长61和长62的连通性最好,而长61的水下分流河道砂体最为发育,连通性也好。油气主要存在于长61和长62的水下分流河道砂体中。

order to clarify the sedimentary characteristics of Chang 6 in the northern loufangping block of Wuqi oilfield,on the basis of core observation and description,combined with the analysis of sedimentary microfacies,comparative analysis of sand bodies and study of sand body distribution characteristics,it is considered that delta front subfacies are developed in Chang 6,mainly including underwater distributary channel,mouth bar and interdistributary bay microfacies.The larger sandbodies are mainly underwater distributary channel sandbodies,most of which are located in the middle of the study area.Chang 6 is mainly distributed with 2 to 3 distributary channel sandbodies in delta front,and the sandbodies are generally distributed in north-south direction.The results show that Chang 61 and Chang 62 are well connected in Chang 6 oil layer group,and Chang 61 underwater distributary channel sandbody has the best overall development degree and good connectivity.Oil and gas mainly occur in the underwater distributary channel sand bodies of Chang 61 and Chang 62.