和田河气田奥陶系碳酸盐岩气藏类型再认识及其意义

和田河气田是在塔里木盆地发现和探明的第一个古生界碳酸盐岩大气田，但围绕其周缘钻探的一系列局部构造相继失利，迫切需要对其气藏类型重新进行认识。为此，通过分析该区地层水、天然气及储层特征，发现大多出水井段为非地层水或少量局部封存水，无大面积的块状底水；天然气性质在纵、横向上有变化，具有明显不均一性；古潜山储层不受现今构造高程控制，非均质性强，横向变化大，连通性差，以相对孤立的缝洞体储层为主。气藏模式分析结果表明：该区奥陶系气藏为沿古潜山顶面分布、受缝洞体储层控制的非构造型气藏，是和田河气田周缘奥陶系勘探的主攻类型，南部的麦盖提斜坡区发育奥陶系风化壳岩溶储层，是寻找大面积非构造油气藏的有利方向。

Recognition of the Ordovician carbonate reservoir types of the Hetianhe Gas Field,Tarim Basin,and Its Significance

The Paleozoic carbonate reservoirs are first discovered in the Hetianhe of the Tarim Basin,but the successive failures in the exploratory drilling at its marginal areas compel us to get a new understanding of reservoir types there.Therefore,through a deep investigation into formation water,characteristics of natural gas and reservoirs,and types of gas reservoirs,the following conclusions are presented herein in this paper.(1) Non-formation water or a small amount of local connate water presents at most wate...