摘要
“深盆气”是由一种“气水倒置”的特殊圈闭形成的非常规天然气聚集 ,构造平缓、储层致密和具有不间断供气的气源是其形成的主要条件。鄂尔多斯盆地上古生界岩性致密、构造平缓 ,又存在生气量巨大的煤系地层 ,具有形成深盆气的地质条件 ;同时又具有区域性的气水倒置、盆地中部普遍含气及地层压力异常等特点。所以 ,鄂尔多斯盆地上古生界天然气的聚集为“深盆气”似应无疑。但是 ,其“广布型”的生烃层系及储层连通性很差 ,与加拿大阿尔伯达地区的“深盆气”有一定的差异。“深盆气”的确定意味着巨大的资源潜力 ,目前勘探需寻找现有工艺技术条件下可开采的相对的“高渗区” ;开采时要采用大型压裂为主的增产措施 ,同时注意防止对储层的伤害。
Deep Basin Gas” is an unconventional gas accumulation with an upside-down relation of water to gas in a special trap and its major formation conditions include gentle structure,tight reservoir and succeeding gas source.The Upper Paleozoic in E′erduosi Basin is of the geological conditions of forming the deep basin gas because of its tight rocks and gentle structure and the existence of coal measure strata which can generate a great number of natural gas;meanwhile it also possesses a regional upside-down relation of water to gas and the properties as wide-distributed abnormal formation pressures and gas shows in the central part of the basin.Therefore it is undoubted that the natural gas accumulation in the Upper Paleozoic in E′erduosi Basin is the deep basin gas.However there is still a certain difference between it and the “Deep Basin Gas” found in Alberta of Canada because of its wide-distributed hydrocarbon generation series of strata and the reservoirs with a very bad connectivity.The determination of the deep basin gas means a giant resource potential.Currently it is necessary for gas exploration to survey the relatively high permeability area where the reservoir may be put into production with existing technological conditions.Such a stimulation which mainly uses a large-scale fracturing should be adopted when the reservoir is being put into production and it is ,meanwhile,very important to pay attention to preventing the reservoir from being damaged.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2000年第6期11-15,共5页
Natural Gas Industry
关键词
鄂尔多斯盆地
晚古生代
致密砂岩
气藏
深盆气
E′erduosi Basin,Late Paleozoic Era,Tight sandstone,Gas reservoir,Pressure anomaly,Stimulation,Deep basin gas
