Characteristics and Hydrocarbon Generation Potential of Chang 9 Source Rocks on Yishaan Slope, Ordos Basin

doi:10.7657/XJPG20220304

Abstract

Abstract:

A number of favorable oil-bearing areas have been discovered in the lower assemblage adjacent to the Chang 9 source rocks on Yishaan slope, Ordos basin. In order to promote the petroleum exploration of the lower assemblage in this area, it is urgent to deepen the research on the characteristics and hydrocarbon generation potential of the Chang 9 source rocks. The distribution of the Chang 9 source rocks were analyzed using well logging, mud logging and core data. The geochemical characteristics and hydrocarbon generation potential of the Chang 9 source rocks were studied by various methods such as rock pyrolysis analysis, total organic carbon analysis, kerogen maceral analysis, and biomarker analysis by saturated hydrocarbon gas chromatography-mass spectrometry. The results show that the Chang 9₁ source rocks are distributed in Wuqi, Jingbian, Zhidan, Ansai and other areas, with the maximum thickness of over 20 m, and the Chang 9₂ source rocks are mainly developed in Ganquan-Luochuan area, with the maximum thickness of over 12 m. The Chang 9 source rocks hold a high abundance of organic matters that were originated from lower aquatic organisms and terrestrial higher plants. With Type Ⅰ and Ⅱ₁ organic matters in dominance, which are in the mature stage, the Chang 9 source rocks exhibit high hydrocarbon conversion rate and especially strong hydrocarbon generation capability in Zhidan-Ansai area. The Chang 9 source rocks are mostly good and locally high-quality rocks with strong hydrocarbon generation and expulsion capacities, which provides a material basis for hydrocarbon accumulation in the lower assemblage of Yanchang formation on Yishaan slope.

Key words: Ordos basin, Yishaan slope, Yanchang formation, Chang 9 source rocks, geochemistry, hydrocarbon generation potential, oil-source correlation, lower assemblage

CLC Number:

TE122.1

LUO Lirong, LI Jianfeng, YANG Weiwei, MA Jun, LI Huan, WU Kai. Characteristics and Hydrocarbon Generation Potential of Chang 9 Source Rocks on Yishaan Slope, Ordos Basin[J]. Xinjiang Petroleum Geology, 2022, 43(3): 278-284.

Figures/Tables 6

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