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通过对镰刀湾探区近200口井的岩心观察及对镰2井、镰18井、化103井等的重点分析,结合野外露头、测井分析、砂体变化等资料,对镰刀湾探区延长组长6油层组沉积微相进行了研究.镰刀湾探区三叠系延长组长6油层组主要发育三角洲沉积体系,并以三角洲前缘沉积为主,研究区北部发育三角洲平原.研究区以三角洲前缘沉积为主,并进一步细分为水下分流河道、水下天然堤、河口坝及分流间湾等;三角洲平原沉积可细分为分流河道、决口扇、河漫滩等微相.
Based on the core observation of nearly 200 wells in the area of sickle bay and key analysis of sickle 2, sickle 18 and chemical 103 wells, combined with the data of outcrop, logging analysis and sand body change, Chang 6 reservoirs are extended to study the sedimentary microfacies.The Chang 6 reservoir of Triassic Yanchang Formation in Keya Bay exploration area mainly develops delta sedimentary system and is mainly composed of delta front sediments and delta plain in the northern part of the study area.The study area The sediments of the delta front are mainly subdivided into underwater distributary channel, underwater natural dike, estuarine dam and shunt bay. Delta sediments can be subdivided into micro-facies such as distributary channel, ripple fan and river floodplain.