涪陵区块凉高山组页岩气储层特征及关键参数评价

Characteristics and key parameter evaluation of shale gas reservoirs in Lianggaoshan Formation in Fuling Block

涪陵区块凉高山组作为页岩气勘探的新层系,存在着岩性复杂、非均质性强、实验分析数据较少、研究程度低的难点。在系统整理1 491项次的分析测试资料基础上,开展页岩气储层特征分析,应用陆相页岩气测井解释评价技术对储层参数开展定量计算。凉高山组页岩储层总有机碳含量较高,演化程度适中、厚度大、储集性能较好、整体含气性较好,表明其富有机质泥页岩具有良好的页岩油气地质条件。对页岩储层评价参数进行定量计算,其模型的解释精度均在80%以上。

As a new strata series for shale gas exploration,the Lianggaoshan Formation in the Fuling Block has the difficulties of complex lithology,strong heterogeneity,less experimental analysis data,and low research level.Based on systematically sorting out the analysis and testing data of 1,491 items,the shale gas reservoir characteristic analysis is carried out,and the continental shale gas logging interpretation and evaluation technology are applied to quantitatively calculate the reservoir parameters.The Lianggaoshan Formation shale reservoir has high total organic carbon content,moderate evolution degree,large thickness,good storage performance,and good overall gas-bearing properties,indicating that its organic-rich mud shale has good shale oil and gas geological conditions.The shale reservoir evaluation parameters are quantitatively calculated,and the interpretation accuracy of the models is above 80%.