【摘要】：塔里木盆地西南地區(qū)早中寒武世巖相古地理存在一定爭議,這制約了該區(qū)的勘探評價。綜合利用露頭、鉆井和地震資料,開展沉積相、地震相分析,并結合區(qū)域構造背景,恢復了巖相古地理格局,提出了相應的沉積模式。中下寒武統(tǒng)發(fā)育陸棚相、開闊臺地相、局限臺地相、蒸發(fā)臺地相和緩坡相。震旦紀末期麥蓋提斜坡南部形成水下低隆起,向南在西南坳陷區(qū)殘留部分被動陸緣,主要發(fā)育緩坡相、陸棚相;麥蓋提斜坡區(qū)地勢較高,地層較薄,主要發(fā)育局限臺地和蒸發(fā)臺地潮坪;巴楚隆起區(qū)水體局限,在干燥炎熱氣候下形成了厚度較大的蒸發(fā)臺地膏鹽湖沉積。巴楚隆起區(qū)和麥蓋提斜坡區(qū)中下寒武統(tǒng)膏鹽巖分布廣泛,與下伏碳酸鹽巖可構成良好的儲蓋組合,西南坳陷區(qū)殘留部分被動陸緣,烴源巖發(fā)育條件較好,這表明塔西南具有較好的油氣前景。
[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.
【作者單位】： 中國石化石油勘探開發(fā)研究院無錫石油地質研究所;中國石化西北油田分公司勘探開發(fā)研究院;
【基金】：中石化科技部項目“巴麥地區(qū)古生界油氣成藏條件與勘探方向”(編號:P10023) 中石化西北石油局項目“塔里木盆地南部奧陶紀巖相古地理研究”(編號:KY-2013-S-039)資助
【分類號】：P618.13;P534.41

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