Distribution and hydrocarbon generation potential of the Nanhua-Cambrian source rocks in Tarim Basin

doi:10.3969/j.issn.1672-7703.2022.04.009

Abstract

Abstract: Tarim Basin has large scale marine oil and gas reserves. However, it is still uncertain whether the Lower Cambrian source rocks which have high TOC content but thin thickness are sufficient for the current huge reserves. On the other hand, there is a lack of understanding on the development of the Precambrian source rocks and their contribution to hydrocarbon accumulation. In order to comprehensively evaluate the potential of marine oil and gas resources in Tarim Basin, the carbon isotope curve, sedimentary filling and seismic reflection characteristics are used to establish the stratigraphic correlation framework of Nanhua-Cambrian between Tarim Basin and the world, identify the potential source rocks of the Nanhua Triaiken Formation, Sinian Yukengou Formation and Shuiquan Formation, and define the development section, thickness and TOC of the Cambrian source rocks. Furthermore, an innovated technology of TOC normalized evaluation of source rocks is established, which enables to more accurately reflect the organic carbon abundance of source rocks. The hydrocarbon generation evaluation of source rocks indicates that oil and gas resources of the Cambrian source rocks are about 7500×10⁸ t oil equivalent, which contribute the most to marine oil and gas resources in Tarim Basin.

CLC Number:

TE122

Zhang Ke, Pan Wenqing, Su Jin, Zhang Min. Distribution and hydrocarbon generation potential of the Nanhua-Cambrian source rocks in Tarim Basin[J]. China Petroleum Exploration, 2022, 27(4): 121-134.

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