鄂尔多斯盆地天然气圈闭类型初探

A Primary Discussion on the Types of Natural Gas Traps in Eerduosi Basin

据对鄂尔多斯盆地天然气勘探所获各种信息及该盆地的地质特征,将该区天然气圈闭类型划分为:古地貌披盖圈闭、构造圈闭、地层圈闭及岩性圈闭四大类,并分别研究了其特征。确定了古地貌披盖圈闭的重要性,中央古隆起特别是其东侧的志丹—富县地区是寻找奥陶系顶部古地貌披盖圈闭气藏的主要地区;构造圈闭气藏主要发育于盆地周缘地区;伊盟隆起南坡、中央古隆起的围斜部位是寻找区域地层圈闭气藏的重要地区;盆地东部和伊盟地区是上古生界砂岩体圈闭气藏发育的重要区域。

According to the various informations obtained in the stage of exploring natural gas in Eerduosi Basin and its geological characteristics,the types of natural gas traps in this region are primarily divided into four ones as follows:paleo-geomorphic drape trap,structural trap,stratigraphic trap and lithologic trap, etc., and the characteristics of each one are studied. The importance of the paleo-geomorphic drape trap in Eerduosi Basin is affirmed and the Central Uplift,especially the Zhidan-Fuxian district at its east side,is the main region for surveying gas reservoirs in paleo-geomorphic drape traps in the top of Ordovician. The gas reservoirs in structural traps are mainly developed around the basin. The south declivity of Yimeng Uplift and the slope places around Central Uplift are the important areas for surveying gas reservoirs in regional stratigraphic traps. The east of the basin and Yimeng district are the important areas of developing sandstone body traps in Upper Paleozoic. In addition,salt-structural traps in Yanwa area may not be ignored also.