鄂尔多斯盆地海相烃源岩系发育特征与勘探新领域

发布时间：2018-01-23 02:10

本文关键词： 鄂尔多斯盆地海相烃源岩碳酸盐岩资源潜力勘探新领域　出处：《石油学报》2016年08期 　论文类型：期刊论文

【摘要】：鄂尔多斯盆地油气勘探已进入储量发现高峰期,围绕延长组烃源岩的石油资源和来自上古生界煤系地层的天然气资源基本探明。随着盆地油气勘探的深入,急需寻找新的油气勘探接替领域。研究认为,古老海相烃源岩发育2套:即中上奥陶统海相碳酸盐岩烃源岩系和中上元古界海相碎屑岩烃源岩系。中上奥陶统海相烃源岩在不同海域有不同的特征。中奥陶统海相烃源岩发育于盆地东部华北海台内盐坳周边,以泥灰岩为主,单层厚度薄,但层系多,有机质丰度差—中等,高成熟度,有规模生烃潜力,对奥陶系盐下自源气藏有重要贡献。上奥陶统海相烃源岩主要发育于盆地西部和南部"L"型秦祁海槽斜坡相带,以泥页岩、泥灰岩为主,有机质丰度中等,累计厚度大,在天环凹陷上达到高—过成熟生气阶段,分布范围有限,在盆地西缘逆冲带上盘处于成熟生油阶段,生烃潜力较大。而中上元古界海相泥岩烃源岩系在邻区为有效烃源岩,以泥板岩为主,厚度大,有机质丰度中等,高过成熟度。在盆地本部甘陕裂陷槽新钻井中也有部分揭示。围绕2套海相烃源岩系分布的奥陶系海相碳酸盐岩和中上元古界深层海相层系是未来天然气勘探的2个新领域,其中5个有利勘探区带天然气勘探潜力大,有望形成天然气勘探接替区带。
[Abstract]:The exploration of oil and gas in Ordos Basin has entered the peak of reserves discovery. The oil resources of source rocks and natural gas resources from the Upper Paleozoic coal measure strata have been basically proved around the source rocks of Yanchang formation. With the development of oil and gas exploration in the basin. It is urgent to find a new oil and gas exploration replacement field. 2 sets of ancient marine source rocks:. That is, the source rock series of marine carbonate rocks of middle and upper Ordovician and the source rock series of marine clastic rocks of middle and upper Proterozoic. The source rocks of marine facies of middle and upper Ordovician have different characteristics in different sea areas. The source rocks of marine facies of middle and upper Ordovician are developed in the eastern part of the basin. Around the salt depression in the Huabei platform. It is mainly mudstone with thin monolayer thickness, but there are many layers, organic matter abundance is poor-medium, high maturity, and has the potential of hydrocarbon generation on a large scale. The source rocks of the Upper Ordovician marine facies mainly developed in the "L" type Qinqi trough slope facies belt in the western and southern part of the basin, mainly composed of shale and marlite, with moderate organic matter abundance. The accumulative thickness is large, in Tianhuan sag the stage of high-over-mature gas generation is reached, the distribution range is limited, and the plate of thrust belt in the western margin of the basin is in the mature stage of oil generation. The source rocks of marine mudstone in the middle and upper Proterozoic are effective source rocks in the adjacent area, mainly of mudstone slate, with large thickness and moderate abundance of organic matter. The Ordovician marine carbonate rocks and the middle and upper Proterozoic deep marine facies strata around two sets of marine source rock series distribution are the future of natural gas exploration. 2 new areas. Among them, 5 favorable exploration zones have great potential for natural gas exploration, which is expected to form a natural gas exploration replacement zone.
【作者单位】：中国石油勘探开发研究院;中国石油长庆油田勘探开发研究院;
【基金】：国家重大科技专项(2011ZX05004-002) 中国石油天然气集团公司重大科技专项(2014E-3201)资助
【分类号】：P618.13
【正文快照】： 鄂尔多斯盆地是中国第二大沉积盆地,盆地面积约25×104km2。该盆地是一个稳定沉降、坳陷迁移、扭动明显的多旋回沉积型克拉通类含油气盆地,是中新生代和元古代—古生代的多元复合型沉积盆地。经历了中晚元古代陆缘裂谷盆地、早加里东期克拉陆表海盆地、晚加里东期秦祁海槽、海

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