Formation conditions and exploration potential of tight oil in the Permian saline lacustrine dolomitic rock, Junggar Basin, NW China
Formation conditions and exploration potential of tight oil in the Permian saline lacustrine dolomitic rock, Junggar Basin, NW China
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DOI：
10.1016/s1876-3804(12)60095-0
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发表时间：
2012-12-01
影响因子：
7.5
通讯作者：
Liu Deguang
中科院分区：
文献类型：
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作者：
Kuang Lichun;Tang Yong;Liu Deguang
利用露头、岩心、地球化学等资料对准噶尔盆地二叠系致密油特征及勘探潜力进行了分析评价。准噶尔盆地早、中二叠世为盐湖盆地，残海封闭后，发育一套深湖暗色泥岩与白云岩混合沉积，优质泥岩烃源岩与白云岩泥岩交替发育。成熟阶段的优质烃源岩紧邻致密白云岩储层，为近源致密油的聚集提供了良好的条件。致密油藏主要分布在湖盆中部和斜坡区，局部存在“溶孔”和“裂缝-孔洞”两种类型的甜点。致密油的富集受控于有效源岩和白云岩的分布，致密油在纵向上分布于整个地层中，横向上分布在大片连续的区域内。准噶尔盆地有四个二叠系致密油分布区，即玛湖凹陷的汾城组、吉木萨尔凹陷的芦草沟组、沙张-石树沟凹陷的皮地泉组和博格达山前的芦草沟组。一些油井在这些地区获得了油流，这意味着巨大的资源潜力和未来勘探的有利目标。
The features and exploration potential of the Permian tight oil in the Junggar Basin were analyzed and evaluated using outcrop, core and geochemical data etc. The Junggar Basin in the Early-Mid Permian is a saline lacustrine basin after the residual sea is closed, a set of hybrid sedimentation of deep-lake dark mudstone and dolomitic rock is developed, and the high-quality mudstone source rocks and the dolomite mudstone are alternated. High quality source rocks in mature stage are next to tight dolomitic rock reservoirs closely and provide good conditions for tight oil accumulation of proximal source type. Tight oil reservoirs are mainly distributed in the centre and slope region of the lake basin, and two types sweetspots of "dissolved pore" and "fracture-pore" exist locally. The enrichment of tight oil is controlled by the distribution of effective source rocks and dolomitic rocks, and the tight oil occurs in the entire strata vertically and spreads across large continuous areas horizontally. The Junggar Basin has four Permian tight oil distribution areas, Fencheng Formation in the Mahu sag, Lucaogou Formation in the Jimusaer sag, Pidiquan Formation in the Shazhang-Shishugou sag, and Lucaogou Formation in the Bogeda piedmont. A number of wells obtained oil flow in these areas, suggesting great resource potential and favorable targets for future exploration.