鄂尔多斯盆地西南部上古生界盖层的控气作用  

Gas-controlling Action of the Caprock of Upper Paleozoic Group in the Southwest of Ordos Basin

作　　者：胡维强[1] 

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065

出　　处：《辽宁化工》2015年第1期80-82,共3页Liaoning Chemical Industry

摘　　要：通过对鄂尔多斯盆地西南部上古生界盖层封闭能力的研究表明,局部盖层厚度分布在20~4 0 m之间,而区域盖层厚度主要介于50~130 m之间;研究区盖层空间展布和封闭能力形成时期对天然气形成与分布有控制作用,山1段工业气流井均分布在山1段直接盖层大于30 m的区域,盒8段工业气流井均分布在山1段直接盖层小于30 m区域,并且泥岩盖层闭能力形成时期早于早白垩世气源岩的大量排气期,有利于盆地西南部上古生界天然气的大量聚集成藏。The sealing ability of the caprock of upper Paleozoic group in the southwest of Ordos basin was studied. The results show that local cap-rock thickness distribution is between 20-40m, while the thickness of the main region is between 50-130m; cap-rock space distribution and sealing ability control gas formation and distribution. Industrial gas wells of the first member of Shanxi Formation are located in the area whose direct cap-rock thickness is bigger than 30m, while industrial gas wells of the eighth member of Shihezi Formation are located in the area whose direct cap-rock thickness is less than 30m, and mudstone cap-rock sealing ability formed before early cretaceous when source rocks largely discharged gas, which was advantageous to form large gas accumulation in upper Paleozoic group in the southwest of Ordos basin.

关 键 词：上古生界 盖层 空间展布 封闭能力 

分 类 号：TE122[石油与天然气工程—油气勘探]