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准噶尔盆地东部滴水泉油田侏罗系八道湾组依据岩性在纵向上表现为“粗—细—粗”的变化,将其自下而上划分为三段,识别出辫状河、辫状河三角洲、湖泊3种沉积相以及5种沉积亚相,主要发育2套大的储盖组合,辫状河道砂体和辫状河三角洲分流河道砂体是最有利的储集砂体,主要发育于J1b1段和J1b3段中下部,区域性的泥岩盖层主要发育于J1b2段和J1b3段上部。不整合面、断裂和骨架砂体构成输导体系。目前已发现的油气主要富集在J1b1段辫状河道亚相中,且位于克拉美丽山前古斜坡带与古沟谷相交处。造成这种油气聚集差异主要包括不整合面和沟谷型古地貌两方面原因,识别出7个古沟谷,沟谷型古地貌可与J1b1段广泛分布的辫状河道砂体组合形成地层—岩性油气藏,是研究区最有利的勘探目标。
According to the lithology, the Jurassic Badaowan Formation of the Lower Shui Shui-Chun Oilfield in the eastern part of the Junggar Basin changes longitudinally into “coarse-thin-coarse”, which is divided into three sections from bottom to top, identifying braided river and braided Three kinds of sedimentary facies, five kinds of sedimentary facies and five sedimentary subfacies. There are mainly two sets of major reservoir-cap assemblages. The braided channel sand body and braided river delta distributary channel sand body are the most favorable reservoir sand bodies, mainly Developed in the lower part of J1b1 and J1b3, the regional mudstone caprock mainly develops in the upper part of J1b2 and J1b3. Unconformity, fracture and skeleton sand constitute the transport system. The oil and gas discovered so far mainly accumulate in the braided channel subfacies J1b1 and are located at the intersection of the ancient slope zone and the ancient gully valley in the Kelameili Piedmont. The differences of these hydrocarbon accumulation mainly include unconformity and paleogeomorphology. Seven ancient valleys were identified. The paleo-topography of the valleys can be combined with the widely distributed braided channel sand bodies of J1b1 to form strata - lithologic oil and gas Tibet is the most favorable exploration target for the study area.