Characteristics and main controlling factors of hydrocarbon accumulation of
Permian-Triassic in Lukeqin structural zone, Tuha Basin

doi:10.3969/j.issn.1672-7703.2021.04.011

Abstract

Abstract: The Permian-Triassic in Tuha Basin has great potential for oil and gas exploration and a large amount of remaining resources.However, the degree of exploration is low and only sporadic oil and gas breakthroughs have been made in Tuokexun Sag, Sanpu Sag and Taibei Sag. The current exploration activities mainly concentrate in Lukeqin structural zone in Kumu Bulge. The study shows that the Lukeqin large complex nose bulge zone has the richest Permian-Triassic oil reservoirs in Tuha Basin with complex tectono-stratigraphic framework and multiple types of oil reservoirs. The stratigraphic onlapping, reversion fold of fault depression, unconformity surface and faulted fan surrounding the paleo bulge are favorable conditions for the formation of multiple types of traps, which determine the hydrocarbon accumulation characteristics of complex oil and gas enrichment zone in Lukeqin large nose bulge zone. The source rocks of Taodonggou group in main hydrocarbon generation center of adjacent Taibei Sag are material basis for the large-scale hydrocarbon accumulation. The paleo uplift provides favorable tectonic settings for hydrocarbon accumulation in the Early Yanshanian period. The early deep and major faults controlling structures are the main channels for vertical hydrocarbon migration, which are also the key factors for differential hydrocarbon accumulation. The oil reservoir of Permian Wutonggou Formation is mainly controlled by the distribution of favorable sand bodies of fan delta front facies, while that of the Triassic Karamay Formation is mainly controlled by fault blocks.

CLC Number:

TE122.3

Wu Chao, Li Hongwei, Sheng Shuangzhan, Cheng Tian, Shi Xiaofei, Jiang Menglei. Characteristics and main controlling factors of hydrocarbon accumulation of Permian-Triassic in Lukeqin structural zone, Tuha Basin[J]. China Petroleum Exploration, 2021, 26(4): 137-148.

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Characteristics and main controlling factors of hydrocarbon accumulation of Permian-Triassic in Lukeqin structural zone, Tuha Basin

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