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通过对芽坪区内岩相、沉积构造、录井测井资料及电测曲线的综合认识,结合地层划分,对该区长6油层的沉积相类型以及砂体展布特征进行了研究。认为研究区三叠系延长组长6时期处于安塞三角洲上游地带,主要为三角洲发育区,将长6油层组划分为三角洲平原和三角洲前缘亚相,其中在长64、长63、长62时期研究区属于三角洲前缘亚相,长61时期属于三角洲平原亚相。确定了长6油层小层沉积微相展布特征,为预测有利区奠定基础。
Based on the comprehensive understanding of lithofacies, sedimentary structures, well log data and electrical measuring curve in the area of Bud Ping, combined with the stratigraphic division, the sedimentary facies types and the sand body distribution characteristics of Chang 6 reservoir in this area were studied. It is considered that the Triassic Yanchang Formation in the study area was located in the upper reaches of the Ansai Delta during the 6th period, mainly in the Delta development area. The Chang 6 reservoir group is divided into delta plain and delta front subfacies, of which 64 are long, 63 are long, 62 are long The study area belongs to the delta front facies, and the Chang 61 period belonged to the delta plain subfacies. The distribution characteristics of sedimentary microfacies in Chang 6 reservoir are confirmed, which lays the foundation for the prediction of favorable area.