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松辽盆地大情字井地区油气勘探重点已由构造油藏转为隐蔽性岩性油藏,非主力油层青二段成为今后主要勘探目标。对区域地质资料、岩心资料、重矿物、地震以及测井曲线等资料进行综合分析,确定大情字井地区青二段油层主要为三角洲前缘—前三角洲沉积体系,并对主要沉积微相类型进行了识别,分析了主力小层沉积微相与砂体展布规律。砂体类型以水下分流河道和河口坝为主,其中,水下分流河道呈条带状SW—NE向展布,向东逐渐减薄,受河道侧向摆动影响,砂体呈叠置或切割分布,形成复合条带状砂体和断续砂。
The focus of oil and gas exploration in the Daxingzijing area of the Songliao Basin has shifted from tectonic reservoirs to concealed lithologic reservoirs. The second member of the non-main oil layer has become the major exploration target in the future. Based on the comprehensive analysis of the regional geological data, core data, heavy minerals, earthquakes and well logging curves, it is confirmed that the main reservoirs of the Qing 2 Member in the Daqingzijing area are mainly delta front-front delta sedimentary systems, and the major sedimentary microfacies Identified, analyzed the main small sedimentary microfacies and sand body distribution law. Sand bodies are dominated by underwater distributary channels and estuarine dams. Among them, the underwater distributary channels are distributed in a stripe pattern of SW-NE and are gradually thinned to the east. Due to the lateral swing of the channel, the sand bodies are stacked or Cutting distribution, the formation of complex strip sand bodies and intermittent sand.