鄂尔多斯盆地环县地区三叠系长7段烃源岩特征及油源对比

doi:10.12108/yxyqc.20260212

Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (2): 134-144.doi: 10.12108/yxyqc.20260212

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Characteristics and oil-source correlation of Triassic Chang 7 member source rocks in Huanxian area, Ordos Basin

LI Tao¹(), MA Guofu², ZHAO Leyi²(), YUAN Li², MA Qilin², XIE Jingyu², ZHANG Bo², LI Henan²

¹ Department of Exploration, PetroChina Yumen Oilfield Company, Jiuquan 735019, Gansu, China
² Research Institute of Exploration and Development, PetroChina Yumen Oilfield Company, Jiuquan 735019, Gansu, China

Received:2025-07-11 Revised:2025-09-23 Online:2026-03-01 Published:2026-01-20

Abstract

Abstract:

Triassic Chang 7 member shale is the main source rock in Huanxian area of the western Ordos Basin. Through rock pyrolysis, total organic carbon measurement, gas chromatography-mass spectrometry, and AI-assisted comprehensive biomarker analysis， geochemical characteristics of crude oils and source rocks were systematically studied，the origin of crude oil and the proportion of hydrocarbon supply from mudstones and shales were clarified, and their hydrocarbon accumulation models were explored. The results show that：（1） Triassic Chang 7 member in the eastern Huanxian area is primarily developed shale,characterized by high organic matter abundance, favorable organic matter type, significant hydrocarbon generation potential. In contrast, the western part is dominated by dark mudstone, with TOC values ranging from 0.40% to 6.23%, hydrocarbon generation potential （S₁ + S₂） of 0.50-13.13 mg/g, organic matter types of TypeⅡ and Ⅲ, and an average vitrinite reflectance (R_o) of 0.84%, indicating a mature stage. It belongs to a medium-poor source rock with relatively lower hydrocarbon generation potential compared to shale. （2） Biomarker compositions of eastern shales and western mudstones are fundamentally similar, but significant differences exist in certain biomarker parameter ratios. Eastern shales exhibit low Pr/Ph ratios, high Ts/Tm, C₂₉Ts/C₂₉H, C₃₀*/C₂₉H, and C₃₀*/C₃₀H values. In contrast, western dark mudstones display relatively high Pr/Ph ratios, low Ts/Tm, C₂₉Ts/C₂₉H, C₃₀*/C₂₉H, and C₃₀*/C₃₀H values. These differences reflect the controlling effect of paleo-sedimentary environments on the development of mudstones and shales in the study area. （3） Chang 8 member in the study area develops three types of crude oil: Type A is crude oil predominantly from the eastern Chang 8 member, exhibiting high Ts/Tm and C₂₉Ts/C₂₉H values, along with relative high C₃₀*/C₂₉H and C₃₀*/C₃₀H values, type A is primarily derived from eastern shales. Type C, though currently less abundant, is characterized by low Ts/Tm, C₂₉Ts/C₂₉H, C₃₀*/C₂₉H, and C₃₀*/C₃₀H values, predominant sourcing from western mudstone. Type B, found in the western Chang 8 member, displays intermediate biomarker between type A and type C, with moderate Ts/Tm, C₂₉Ts/C₂₉H, C₃₀*/C₂₉H, and C₃₀*/C₃₀H values. It is a mixed crude oil composition dominantly contributed by eastern shales.

Key words: shale, geochemical characteristics, biomarkers, oil-source correlation, the 7th member of Yanchang Formation, Triassic, Huanxian area, Ordos Basin

CLC Number:

TE122.2

LI Tao, MA Guofu, ZHAO Leyi, YUAN Li, MA Qilin, XIE Jingyu, ZHANG Bo, LI Henan. Characteristics and oil-source correlation of Triassic Chang 7 member source rocks in Huanxian area, Ordos Basin[J].Lithologic Reservoirs, 2026, 38(2): 134-144.

Figures/Tables 11

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TRENDMD:

样品类型		区域	井号	层位	沉积环境指数（DEI）
烃源岩	页岩	东部	H102	长7₃	0.085
	泥岩	东部	H102	长7₂	0.120
	泥岩	西部	H804	长7₃	0.065
	泥岩	西部	H82	长7₂	0.033
原油		东部	H12	长8	0.083
		西部	H92	长8	0.079
		西部	H94	长8	0.072

Characteristics and oil-source correlation of Triassic Chang 7 member source rocks in Huanxian area, Ordos Basin

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