Evaluation of Shale Gas Reservoir Characteristics and Exploration Potential of Longtan Formation in Zhina Area
In order to identify the exploration prospect of shale gas in Longtan Formation in Zhina area,the mineral composition,or-ganic geochemical characteristics,microscopic pore characteristics,thickness and distribution of bored mud shale and gas content charac-teristics of Z2 well Longtan Formation were analyzed,and the characteristics of shale gas reservoirs in Longtan Formation were studied and the exploration potential of shale gas was evaluated.The results show that the organic matter type of shale is type Ⅱ2-Ⅲ,and mainly Ⅱ2,the total organic carbon content is 1.34％～8.25％,the average is 3.68％,and the maturity of organic matter is 0.92％-3.24％,with an average of 2.45％,which belongs to the high-high maturity evolution stage and has good vitality potential.The results of scanning electron microscopy show that the mud shale samples mainly develop four types of microscopic pores,including endogranular science,in-tergranular pores,organic matter pores and microfractures,and the internal pores are developed,which provid a good storage space for shale gas.The brittle mineral content of mud shale in Z2 well is 24.40％～63.08％,the average is 41.22％,the total thickness of mud shale is 170.74 m,accounting for 42％,and five mud shale layers with effective continuous thickness greater than 15 m are developed,and two shale sections can be formed with adjacent wells,which are suitable for fracturing transformation.The shale of Longtan Formation in Zhina area has good vitality conditions,reservoir conditions and fracturability,and has great exploration potential.
万方数据
维普
