川东渡口河气田飞仙关组气藏地质特征与勘探前景
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摘要
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 gas reservoir of Feixianguan Formation,Lower Triassic,in Dukouhe gas field is one of the important gas reservoirs found in Sichuan Basin in recent years and also is the gas reservoir with the best quality reservoir beds and the most abundent resources in comparison with the gas reservoirs found in Feixianguan Formation in East Sichuan at present,being of predicted gas bearing area of more than 100 km 2 and gas resource extent of tens of billions cubic metres.The reservoir rocks of the gas reservoir are mainly the residual oolitic dolostones formed by dolomitization,then the oolitic limestones;the effective thickness of the reservoir bed is large,because the pores,cavities ard fractures are developed in it and make it be of multiple void types;the storage rooms are mainly the residual intergrannular and intragrannular solution pores and cavities;and the fractures and pore throats are the migration channels.The gas reservoir belongs in lithological trap,being of the properties of normal pressure and high hydrogen sulfide content.There are five lithological traps predicted by seismic exploration at the nearest Wubaochang region,being of gas resources of tens of billions cubic metres,where may be taken as the important exploration targets.
The gas reservoir of Feixianguan Formation,Lower Triassic,in Dukouhe gas field is one of the important gas reservoirs found in Sichuan Basin in recent years and also is the gas reservoir with the best quality reservoir beds and the most abundent resources in comparison with the gas reservoirs found in Feixianguan Formation in East Sichuan at present,being of predicted gas bearing area of more than 100 km 2 and gas resource extent of tens of billions cubic metres.The reservoir rocks of the gas reservoir are mainly the residual oolitic dolostones formed by dolomitization,then the oolitic limestones;the effective thickness of the reservoir bed is large,because the pores,cavities ard fractures are developed in it and make it be of multiple void types;the storage rooms are mainly the residual intergrannular and intragrannular solution pores and cavities;and the fractures and pore throats are the migration channels.The gas reservoir belongs in lithological trap,being of the properties of normal pressure and high hydrogen sulfide content.There are five lithological traps predicted by seismic exploration at the nearest Wubaochang region,being of gas resources of tens of billions cubic metres,where may be taken as the important exploration targets.
引文
1 王新建等.川东飞三段鲕状灰岩成岩作用与储层特征.天然气工业,1986;(2) :28 ～33
2 文应初等.四川地区早三叠世飞仙关期碳酸盐台地增生与有利储集相带展布.天然气工业,1988;(2) ;18 ～23
2 文应初等.四川地区早三叠世飞仙关期碳酸盐台地增生与有利储集相带展布.天然气工业,1988;(2) ;18 ～23
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