江西宜春地区北型乐平组页岩气成藏条件分析

Analysis of Reservoir-forming Conditions of Shale Gas of North Type Leping Formation in the Yichun of Jiangxi Province

依据钻探资料,结合地球化学特征、矿物组成、岩石储集特征等实验数据,从沉积环境、展布特征、地球化学特征、储集物性、含气性等方面,分析了上古生界北型乐平组富有机质泥页岩在萍乐坳陷西段宜春袁州地区的成藏条件。结果表明,北型乐平组泥页岩在区内地层厚度大、有机质丰度高、有机质类型以Ⅰ型和III型为主、高成熟-过热演化程度、孔隙微裂隙发育。研究区属于典型高角度逆断层向斜成藏模式,页岩气、致密气、煤层气互层共存,结合资料井气显情况认为,研究区具备较好的成藏条件。

Based on drilling data and the experimental data of geochemical characteristics,mineral composition,and rock reservoir characteristics,etc.,this paper studied the gas reservoir condition of the upper Paleozoic north Leping formation in western segment of the Peling depression area in Yuanzhou district of Yichun,in sedimentary environment,regional distribution,geochemical features,the gas reservoir and gas-bearing property.The result has shown that the north type Leping formation have large thickness,high abundance of organic matter with mainly typeⅠandⅢ,high-post maturity,and well-developed pores and microfractures.The study area belongs to the typical gas reservoir of syncline with high angle reverse fault,and that shale gas,tight gas and coalbed methane are coexisted.It is considered that the study area has a relatively good reservoir-forming condition of shale gas based on the data from gas-bearing condition of wells.