塔西南坳陷震旦纪末古构造格局及其油气意义

doi:10.3969/j.issn.1672-7703.2018.04.008

摘要/Abstract

摘要： 综合西昆仑露头资料、塔里木盆地内钻穿寒武系钻井信息和地震剖面特征，研究了盆地震旦系纪末的古构造格局，分析了震旦纪末古构造格局与下寒武统玉尔吐斯组烃源岩分布的关系，明确了塔西南坳陷玉尔吐斯组烃源岩分布特征。研究认为，震旦纪末巴楚—塔中地区存在近东西向展布的古隆起，隆起之上水体较浅，为一套潮坪相沉积，玉尔吐斯组没有沉积或相变，隆起南北两侧的坳陷内玉尔吐斯组有沉积。塔西南坳陷玉尔吐斯组分布在南华纪—震旦纪裂谷或加里东早期正断层形成的洼槽内，主要从昆仑山前中段北东向延伸至麦盖提斜坡区，规模较大。近期坳陷中段罗斯2井在奥陶系蓬莱坝组获得重大油气发现，间接证实了深层寒武系丰富的油气源条件。

关键词: 塔西南坳陷, 震旦纪, 古构造格局, 南华纪-震旦纪裂谷, 玉尔吐斯组, 烃源岩

Abstract: Based on the outcrop data of the West Kunlun Mountains, drilling information on drilled through Cambrian wells and seismic profile characteristics in the Tarim Basin, the paleotectonic pattern at the end of Sinian has been studied to analyze the relationship with the distribution of source rocks of lower Cambrian Yuertusi Formation of the basin, thus to clarify the distribution characteristics of source rocks of the Yuertusi Formation in southwest depression of the Tarim Basin. The results suggest that there is the nearly east-westward ancient uplift at the end of Sinian in the Bachu-Tazhong area. There is a set of tidal flat sedimentary deposits on the top of uplift and the water here is relatively shallow, where has no deposition or phase change in the Yuertusi Formation, but has deposition in the Yuertusi Formation of the depression on north and south sides of the uplift. The Yuertusi Formation in the southwest depression of Tarim Basin is distributed in the depression formed by normal fault in Nanhua-Sinian rift or early Caledonian and extended mainly from the northeastern front-middle section of Kunlun Mountains to the Maigaiti slope region with a large scale of rift. Well Ross 2 in the middle depression of Ordovician Penglaiba Formation recently has made significant oil and gas discoveries, which indirectly confirmed the rich hydrocarbon source conditions of the deep Cambrian.

Key words: southwest depression of the Tarim Basin, Sinian, Palaeotectonic pattern, Nanhua-Sinian rift, Yuertusi Formation, source rock

中图分类号:

崔海峰, 刘江丽, 田雷, 刘军, 张年春. 塔西南坳陷震旦纪末古构造格局及其油气意义[J]. 中国石油勘探, 2018, 23(4): 67-75.

Cui Haifeng, Liu Jiangli, Tian Lei, Liu Jun, Zhang Nianchun. Palaeotectonic pattern at the end of Sinian and its hydrocarbon significance in the southwest depression of Tarim Basin[J]. China Petroleum Exploration, 2018, 23(4): 67-75.

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