鄂尔多斯盆地天然气地质条件、资源潜力及勘探方向

The geological conditions,resource potential and exploration direction of natural gas in Ordos Basin

近年来随着勘探不断深入,勘探目标向中深层和致密气藏拓展,需要对鄂尔多斯盆地的资源现状、类型和数量进行全新的认知。分析了盆地天然气成藏地质条件,建立了下古生界碳酸盐岩气和上古生界致密砂岩气成藏模式,明确了天然气富集规律。同时,为了满足精细勘探的需求,在"层区带"划分的基础上,优选和细化评价参数,采用小面元容积法、EUR类比法等6种方法,评价盆地天然气地质资源量为15.68×10^(12)m^3,剩余地质资源量为8.79×10^(12)m^3。其中,常规气剩余地质资源量为1.67×10^(12)m^3,非常规气剩余地质资源量为7.12×10^(12)m^3。预测了剩余资源层系及地区分布规律,分层次优选了有利勘探目标区带。

In recentyears,exploration target expanded into middle-deep formation and tight-gas along with the development of explorationwork.So,it is needed toreunderstand the resource status,resource type and resource quantity in Ordos Basin. In this paper,we analyzed the geological conditions of gas reservoir for mation, established the reservoir formationmodel of the carbonate gas in Lower Palaeozoic and the tight sandstone gas in Upper Paleozoic, and made clear the natural gas enrichment taws in Ordos Basin. Mean- while,in order to meet the needs of precise prospecting,we optimized and refined the evaluation parame- ters,evaluated the quantity of natural gas resources in Ordos Basin using 6 methods which include the small surface element method and the EUR-analogy method etc.on the basis of ＂layer-zone＂ division. The quantity of natural gas geological resources is 15.68×10^2m^3 and the surplus is 8.79×10^12m^3 in total.The amount of residual geological resources of conventional gas is 1.67×10^12m^3 ,and the mount of residual geo logical resources of unconventional gas is 7.12×10^12 m^3.we forecast the distribution law in different layers and different regions, and optimize favorable exploration target zone hierarchically.