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“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 natural gas accumulation formed by a special trap of “gas-water inversion”. The formation of unconventional gas with gentle structure, dense reservoir and uninterrupted gas supply is the main condition. The Upper Paleozoic in the Ordos Basin is characterized by tight lithology, gentle structure and large amount of coal-bearing strata, with the geological conditions of forming deep basin gas, regional gas-water inversion, and widespread gas and formation pressure anomalies in the central basin Features. Therefore, the accumulation of natural gas in the Upper Paleozoic Ordos Basin seems to be “deep basin gas”. However, its “broad-type” hydrocarbon generation strata and reservoir connectivity are poorly correlated with the “deep basin gas” in Alberta, Canada. The determination of “deep basin gas” implies huge resource potential. At present exploration, it is necessary to find the relatively “high permeability zone” that can be mined under the existing technological conditions; when mining, large-scale fracturing-based stimulation measures should be adopted while paying attention to Prevent reservoir damage.