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本文在前人认识的基础上,经过“九五”前三年的勘探和研究,总结了准噶尔盆地天然气成藏的规律:即具有高成熟腐殖型气源岩的油气系统控制着气藏的层系及地理分布;圈闭条件控制了气藏的类型及规模;有效区域盖层严格地控制天然气藏的层系分布,其下的储集层才为有利目的层;断裂体系对天然气运聚有明显的控制作用。以此,确定天然气勘探方向依次为南缘背斜带、环盆1井西凹陷的各个凸起带、环中拐凸起带以及白家海凸起—五彩湾凹陷,其中玛湖、莫萦湾背斜为勘探大型气田的首选目标。
Based on the previous understanding, this paper summarizes the law of natural gas accumulation in the Junggar Basin after exploration and research in the first three years of the Ninth Five-year Plan period. That is, the petroleum system with high mature humic gas source rocks controls the gas reservoir Stratigraphic and geographical distribution; trapping conditions control the type and size of gas reservoirs; caprock in the effective area strictly controls the stratigraphic distribution of natural gas reservoirs, and the reservoirs beneath it are favorable target layers; fault systems transport natural gas Have obvious control effect. Therefore, it is determined that the natural gas exploration directions are in turn the south margin anticline, each of the uplift belts in the western depression of the Central Basin 1, the Central Shuihuai uplift and the Baijiahai uplift-Wucaiwan sag, in which Lake Mahu, Oblique is the preferred target for exploration of large gas fields.