辽河西部凹陷页岩油聚集条件及有利区优选

Shale oil accumulation conditions and optimization of favorable ureas in the West Liaohv sag

为了查明辽河西部凹陷沙三中亚段页岩油发育有利区,通过地质研究及各类实验测试分析页岩油聚集条件。结果表明:目的层泥页岩厚度大、分布面积广,有机碳质量分数均值为2.18%,有机质类型以Ⅱ型为主,热演化成熟度均值为0.59%,具备良好的页岩油形成条件;泥页岩脆性矿物含量较高,孔隙和裂缝发育,含油量大,具备良好的页岩油储集及后期改造条件。根据多信息叠合法预测有利区,认为清水洼陷页岩油聚集条件和储集性能较优越,是辽河西部凹陷沙三中亚段页岩油勘探开发的有利区域。

In order to identify the favorable areas fur shale oil developing in the mid Sha 3 sub-member of the West Liaohe sag conditions of shale oil accumulation are analyzed based on geologic background and various tests.It is indicated from the results that the target mudstone/shale has features of thick and extensive distribution,with an average muss fraction of organic carbon 2.18%as H type dominanlly and an average thermal evolution maturity 0.59%,favorable for shale oil occurrence.The mudstone/shale rock has high content of brittle minerals with pores and fractures well developed and high oil bearing capacity,good for shale oil accumulation and late alteration.From prediction of favorable areas by means of multi- information superposition,il is suggested that the conditions of shale oil accumulation and reservoir properties in the Qingshui sub-sag are excellent,and il is the favorable area fur exploration and development of the mid Sha 3 sub- member shale oil in the West Liaohe sag.