Cenozoic oil-source correlation and exploration significance in Linhe depression, the Hetao Basin

doi:10.3969/j.issn.1672-7703.2019.03.005

Abstract

Abstract: Linhe depression in the Hetao Basin has been less explored. No significant oil and gas discoveries were made until some breakthroughs recently. Wells S5 and Jh2X delivered commercial oil flows of 62.6 m³/d and 10.26 m³/d, respectively, from Oligocene Linhe Formation during the production tests. In this study, the correlation between oil and source rock of Wells S5 and Jh2X was systematically analyzed from prospective of organic geochemistry, in order to determine the oil-source correlation and thereby facilitate the selection of exploration targets. Crude oil in Wells S5 and Jh2X is less mature to mature, generally reflecting the characteristics of a high-salinity and anoxic lacustrine environment. The source rocks in Lower Cretaceous Guyang Formation and Oligocene Linhe Formation are saline lacustrine facies, and less mature to mature locally with abundant organic matters, good kerogen types and high hydrocarbon-generating potential. The oil-source correlation reveals that the oil in Well S5 was originated from the source rock in Linhe Formation, and the oil in Well Jh2X might derive from the mature source rock in Guyang Formation. In conclusion, Linhe depression has a good exploration potential for its rich oil and gas resources, with Guyang and Linhe Formations as the key exploration targets.

Key words: Hetao Basin, Linhe depression, Cenozoic, oil-source correlation, exploration significance

CLC Number:

Luo Lirong, Li Jianfeng, Zhao Zhanliang, Liu Na, Ma Jun, Yang Weiwei. Cenozoic oil-source correlation and exploration significance in Linhe depression, the Hetao Basin[J]. China Petroleum Exploration, 2019, 24(3): 323-330.

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