二连盆地呼仁布其凹陷南洼下白垩统烃源岩分布特征与油源分析

doi:10.12108/yxyqc.20200310

Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (3): 104-114.doi: 10.12108/yxyqc.20200310

• PETROLEUM GEOLOGY • Previous Articles Next Articles

Distribution characteristics and oil-source analysis of Lower Cretaceous source rock in southern trough of Hurenbuqi sag，Erlian Basin

SHAN Xinjie^1,2, WANG Feiyu^1,2, LIU Nian^1,2, FENG Weiping^1,2, JIANG Tao^1,2, DU Xi^1,2, CHENG Zhiqiang^1,2, LI Sijia^1,2, LI Yue^1,2

1. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China

Received:2019-09-16 Revised:2019-10-17 Online:2020-05-21 Published:2020-04-30

Abstract

Abstract: The Hurenbuqi sag is located in the middle of the Bayinbaolige uplift in the western part of the Erlian Basin. It is one of the many oil-rich sags in the Erlian Basin. The early exploration has found high-quality source rocks and better oil and gas display,but the current research on source rock is weak. The study of source rocks is still relatively weak. Based on the geochemical evaluation of source rock and the organic geochemical analysis of source rock and crude oil samples,the distribution of organic facies and geochemical characteristics of source rocks and oil-source relationships in the southern trough of the Huerenbuqi sag were revealed. The results show that the source rocks of the southern trough in the Huerenbuqi sag are mainly distributed in the eastern belt,and three sets of source rocks in the K₁ ba,K₁ bt₁ and K₁ bt₂ are developed. The source rocks of the K₁ ba are in the stage of low maturation,the source rocks of the K₁ bt₁ are in a low maturation stage,and the source rocks of the K 1 bt₂ are in the immature to lowmature stage. The C source rocks and D/E source rocks are developed in the three layers of the Lower Cretaceous in the southern part of the Hurenbuqi sag. The C source rocks of the main body of the depression are mainly distributed in the K₁ bt₁,the thickness is 300-400 m,the initial hydrogen index is 400- 800 mg/g TOC,and the maceral is composed of sapropelinite and exinite and vitrinite. The parent material is mainly low level aquatic organisms such as algae,formed in brackish water to salt water and reducing environment. The D/E source rocks are mainly distributed in the K₁ ba,with a thickness of 100-200 m,the initial hydrogen index is 200-400 mg/g TOC,and the microscopic composition is mainly composed of exinite,vitrinite and inertinite. The parent material is mainly terrestrial plants formed in fresh water to micro-salt water and weak reducing environment. The hydrocarbon center is located in the eastern belt. According to the oil-source analysis,the mature crude oil of the K₁ ba was derived from the source rocks of the K₁ ba. The low mature crude oil of the K₁ bt₁ was derived from the source rocks of the K₁ bt₁,while the crude oil of the K₁ bt₂ may be derived from the K₁ bt₁ source rock.

Key words: organic facies, oil source analysis, Alshan Formation, Tenger Formation, Lower Cretaceous, Erlian Basin

CLC Number:

TE122.1+13

SHAN Xinjie, WANG Feiyu, LIU Nian, FENG Weiping, JIANG Tao, DU Xi, CHENG Zhiqiang, LI Sijia, LI Yue. Distribution characteristics and oil-source analysis of Lower Cretaceous source rock in southern trough of Hurenbuqi sag，Erlian Basin[J].Lithologic Reservoirs, 2020, 32(3): 104-114.

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Distribution characteristics and oil-source analysis of Lower Cretaceous source rock in southern trough of Hurenbuqi sag，Erlian Basin

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