Hydrocarbon accumulation pattern of reservoirs in Maigaiti slope, Southwest Tarim depression

Abstract

Abstract: There are different understandings on the hydrocarbon accumulation patterns of the Ordovician, Devonian and Carboniferous reservoirs in the Maigaiti slope, the Southwest Tarim depression. Based on the analysis of structure and evolution features of the Southwest Tarim depression and the Bachu uplift, and considering the reservoir development and distribution characteristics of source rocks, it is found that oil and gas are mainly distributed in the fault zone, and oil and gas properties are different in the structural traps formed during different periods. For example, the Bashituopu fault zone and the Yubei fault zone were formed in the late Hercynian contain oil while the Selibuya fault zone and the Mazhatage fault zone were formed in the Himalayan are rich with gas, suggesting the distribution feature as oil in the south and gas in the north. According to the study results, the hydrocarbon accumulation pattern of the Carboniferous and Devonian systems in the western Maigaiti slope is the same as that of the Carboniferous and Ordovician systems in the eastern Maigaiti slope. Moreover, hydrocarbons came from the Cambrian source rocks. Hydrocarbons accumulated in large scale in the Cambrian–Ordovician during the early Hercynian. During the late Himalayan, the Bachu uplift rose, and the oil pools formed earlier reached the conditions for pyrolysis, and oil and gas vertically migrated, forming the Yasongdi and Hetianhe gas fields. The Cambrian pre-salt dolomite formation is the major target for future exploration.

Key words: Maigaiti slope, hydrocarbon accumulation pattern, fault zone, vertical migration, Cambrian pre-salt dolomite

Cui Haifeng, Tian Lei, Liu Jun, Zhang Nianchun. Hydrocarbon accumulation pattern of reservoirs in Maigaiti slope, Southwest Tarim depression[J]. China Petroleum Exploration, 2016, 21(6): 34-42.

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