辽河盆地陈家洼陷沙三段下亚段有利储层预测

Reservoir prediction of lower Sha3 sub-member in Chenjia depression, Liaohe basin

（1.中国石油大学（北京）资源与信息学院物探重点实验室，北京102249；2.中国石油天然气股份有限公司辽河油田分公司勘探开发研究院，辽宁盘锦124010）

CNPC Geophysical Key Lab, College of Resource and information, China University of Petroleum, Beijing 102249, China

陈家洼陷是辽河盆地西部凹陷内的一个生油洼陷，洼陷内沙三段下亚段发育有多套浊积砂体和厚层泥岩，具有自身发育地层岩性圈闭的条件。利用地震属性分析、地震分频处理和模型约束波阻抗反演等技术，对沙三段下亚段的砂体沉积规律和分布特征进行了分析和描述，预测了砂体分布的优势区。在此基础上，结合钻井、测井和岩心资料，对沙三段下亚段4thSQ2和4thSQ3层序顶界面的有利砂体进行了预测。结合沉积相划分结果，对沙三段下亚段地层岩性圈闭的形成模式进行了分析，预测了有利圈闭的分布区域。

Chenjia depression is the main oil source area in the west sag of Liaohe basin. Several series of turbidite sandbodies and huge thick mudstone are developed in its lower Sha3 sub-member. The depression has the condition of forming formation lithologic trap. Using the seismic attribute analysis, frequency division and model-based impedance inversion, the sedimentary laws and distribution characteristics of sandbody in lower Sha3 sub-member was described and analyzed, and the favorable area of sand distribution was forecasted. Based on the results，combined with the drilling, logging and core data, the beneficial sandbody of the top of 4thSQ2 and 4thSQ3 was identified. Referred with the division results of sedimentary faceis, the forming pattern of formation lithologic trap in lower Sha3 sub-member was analyzed, and the distribution of beneficial traps was predicted.