川东飞仙关组鲕滩气藏控制因素及其储集条件研究

根据川东地区飞仙关组已钻资料,对飞仙关组的鲕滩气藏控制因素及储集条件进行了研究。研究表明:飞仙关组的鲕滩气藏控制因素为沉积相、白云石化作用和埋藏溶解作用;从飞仙关组的鲕滩气藏储集条件看,鲕滩气藏多为构造圈闭气藏,保存条件良好。飞仙关组鲕滩气藏成藏条件的关键因素是储层与圈闭。在以上研究的基础上,综合沉积相、成岩相、烃类运聚优势相、局部构造、钻井显示和油气测试结果等因素,对川东的北部地区进行了有利区带预测和划分,即环开江—梁平海槽外缘分布的川东碳酸盐连陆台地边缘鲕粒滩发育区、环开江—梁平海槽内缘分布区是川东飞仙关组鲕滩气藏有利分布区。

Study of controlling factors and accumulation condition of oolitic beach gas reservoir in Feixianguan Formation in the east of Sichuan

According to exploration drilling data of the Feixianguan Formation in the east of Sichuan,this paper has researched into the accumulation condition and controlling factors of oolitic beach gas reservoir in Feixianguan Formation.The research indicates that controlling factors of oolitic beach gas reservoir here are precipitation facies,dolomitization and burial dissolution.Through the accumulation conditions of oolitic beach gas reservoirs in Feixianguan Formation,gas reservoirs are mainly structural traps and its seal conditions are well.Critical factors of oolitic beach gas reservoir's accumulation condition in Feixianguan Formation are reservoir and trap.On the base of above research,precipitation facies,diagenetic facies,profitable hydrocarbons accumulation facies,partial structure,drilled show and hydrocarbon test result,this paper has anticipated and classified beneficial area is land-tied Sichuan-carbonate tableland's fringe oolitic beach on Kaijiang-Liangping ocean trough's outer edge area and Kaijiang-Liangping ocean trough's outer edge inner margin area.