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渡口河气田下三叠统飞仙关组气藏是四川盆地近年来钻探发现的重要气藏之一,也是目前川东地区在飞仙关组内发现的储层品质最佳、资源量最丰富的气藏,预测含气面积逾100 km2 ,天然气资源量达数百亿立方米。气藏的储集岩以白云石化改造形成的残余鲕粒云岩为主,辅以鲕粒灰岩;储层孔、洞、缝发育,有效厚度大;储层的空隙类型多,储集空间主要是残余粒间、粒内溶蚀孔、洞;裂缝和孔隙喉道为渗滤通道;气藏的圈闭类型为岩性圈闭,属常压、高含硫化氢的气藏。紧邻的五宝场地区地震预测存在5 个岩性圈闭,天然气资源量达数百亿立方米,可作为重要的勘探目标。
The Lower Triassic Feixianguan Formation gas reservoir in the Dukouhe gas field is one of the important gas reservoirs discovered in recent years in Sichuan Basin. It is also the reservoir of the highest quality and abundance found in the Feixianguan Formation in the eastern Sichuan region Of the gas reservoir, the predicted gas area of more than 100 km2, natural gas resources amounted to tens of billions of cubic meters. The reservoir rocks of the gas reservoirs are dominated by residual oolitic dolomite formed by the dolomitization alteration, supplemented by oolitic limestone. The pores, seams and seams of the reservoirs are developed with large effective thicknesses. The reservoirs have many types of voids and reservoir space Mainly residual grain, intragranular dissolution pores and holes; fissures and pore throats are percolation channels; the trap type of the gas reservoir is lithologic traps, and belongs to gas reservoirs with atmospheric pressure and high hydrogen sulfide content. There are five lithologic traps in the adjacent area of Wubao earthquake prediction, and the natural gas resources amount to tens of billions cubic meters, which can be an important exploration target.