塔里木盆地西南地区早中寒武世岩相古地理

发布时间：2018-10-18 09:12

【摘要】：塔里木盆地西南地区早中寒武世岩相古地理存在一定争议,这制约了该区的勘探评价。综合利用露头、钻井和地震资料,开展沉积相、地震相分析,并结合区域构造背景,恢复了岩相古地理格局,提出了相应的沉积模式。中下寒武统发育陆棚相、开阔台地相、局限台地相、蒸发台地相和缓坡相。震旦纪末期麦盖提斜坡南部形成水下低隆起,向南在西南坳陷区残留部分被动陆缘,主要发育缓坡相、陆棚相;麦盖提斜坡区地势较高,地层较薄,主要发育局限台地和蒸发台地潮坪;巴楚隆起区水体局限,在干燥炎热气候下形成了厚度较大的蒸发台地膏盐湖沉积。巴楚隆起区和麦盖提斜坡区中下寒武统膏盐岩分布广泛,与下伏碳酸盐岩可构成良好的储盖组合,西南坳陷区残留部分被动陆缘,烃源岩发育条件较好,这表明塔西南具有较好的油气前景。
[Abstract]:The early and middle Cambrian lithofacies paleogeography in the southwest of Tarim Basin is controversial, which restricts the exploration and evaluation in this area. Based on outcrop, drilling and seismic data, sedimentary facies and seismic facies were analyzed, and the lithofacies paleogeographic pattern was restored and the corresponding sedimentary model was put forward. Shelf facies, open platform facies, limited platform facies, evaporation platform facies and gentle slope facies are developed in the middle and lower Cambrian. At the end of the Sinian period, a low uplift was formed in the southern part of the Maigeti slope, and a part of passive continental margin remained southward in the southwest depression, where the gentle slope facies and shelf facies were mainly developed, and the slope area of the Maigeti slope was relatively high in topography and thin in formation. The water bodies in the Bachu uplift area were limited and formed a thicker salt lake deposit in the dry and hot climate. The middle and lower Cambrian gypsum salt rocks are widely distributed in the Bachu uplift area and the Maigaiti slope area, and can form a good reservoir cap assemblage with the underlying carbonate rocks. The remaining part of passive continental margin in the southwest depression area is well developed in the source rocks. This indicates that the southwest of the tower has good oil and gas prospects.
【作者单位】：中国石化石油勘探开发研究院无锡石油地质研究所;中国石化西北油田分公司勘探开发研究院;
【基金】：中石化科技部项目“巴麦地区古生界油气成藏条件与勘探方向”(编号:P10023) 中石化西北石油局项目“塔里木盆地南部奥陶纪岩相古地理研究”(编号:KY-2013-S-039)资助
【分类号】：P618.13;P534.41

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