Palaeotectonic pattern at the end of Sinian and its hydrocarbon significance in the southwest depression of Tarim Basin

doi:10.3969/j.issn.1672-7703.2018.04.008

Abstract

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

CLC Number:

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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