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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 study on the caprock sealing ability in the Upper Paleozoic in the southwestern Ordos Basin shows that the local caprock thickness distributes between 20 and 40 m, while the regional caprock thickness is mainly between 50 and 130 m. The time of spatial distribution and sealing ability control the formation and distribution of natural gas. The industrial gas wells in section 1 of Shan 1 are all distributed in the area of more than 30 m with the direct caprock of mountain 1, and the boxes of 8 industrial gas wells are distributed in section 1 The direct caprock is less than 30 m, and the formation of mudstone caprock is earlier than that of the early Cretaceous gas source rocks, which is favorable for the massive accumulation of gas in the Upper Paleozoic in southwestern basin.