鄂尔多斯盆地志丹地区三叠系长7泥页岩非均质性及控油作用

doi:10.12108/yxyqc.20260209

Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (2): 97-110.doi: 10.12108/yxyqc.20260209

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Heterogeneity and oil control effects of Triassic Chang 7 shale in Zhidan area, Ordos Basin

GUO Yuxin¹^,²(), BAI Yubin¹^,²(), ZHAO Jingzhou¹^,², ZHANG Jun¹^,², CAO Dandan³

¹ School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an 710065, China
² Shaanxi Provincial Key Laboratory of Petroleum Accumulation Geology, Xi’an 710065, China
³ Production Construction Headquarters， Yanchang Oilfield Co., Ltd., Yan’an 716000, Shaanxi, China

Received:2025-08-26 Revised:2025-09-29 Online:2026-03-01 Published:2026-01-15

Abstract

Abstract:

The shale oil resource potential of continental petroliferous basins in China is significant，and heterogeneity of the mud shale reservoir controls its oil-bearing and fracability. Based on testings, such as core observation, total organic carbon (TOC) and pyrolysis, whole rock and clay mineral X-ray diffraction analysis, high-pressure mercury intrusion and nitrogen (N₂) adsorption experiment, heterogeneity characteristics of Triassic Chang 7 shale reservoir in Zhidan area of Ordos Basin were systematically revealed, and its control effect on shale oil enrichment was discussed. The results show that: （1） Triassic Chang 7 in Zhidan area of Ordos Basin is mainly composed of dark mudstone and black shale, which can be divided into felsic mudstone facies, clayey mudstone facies, and mixed shale facies. The macroscopic heterogeneity of different lithofacies is mainly influenced by terrestrial input,volcanic activity frequency, and sedimentary environments, manifested as the greater frequency of bedding distribution and more frequent changes in lithology, and stronger heterogeneity. On a microscopic level, from clayed mudstone, felsic mudstone to mixed shale, the heterogeneity gradually increases with the increasing frequency of bedding. （2） The mineral composition and TOC content of different lithologies vary significantly, exhibiting strong heterogeneity characteristics. （3） The pore types of Chang 7 mud shale re-servoir in the study area are diverse, including intergranular pores, intragranular pores, clay mineral intercrystalline pores, pyrite intercrystalline pores, and microfractures. The pore structure is mainly mesoporous, with pore diameters ranging from 10 to 100 nm, developing “ink bottle” shaped pores and parallel plate-shaped pores. （4） Lithology, mineral content, TOC content, and pore structure all have controlling effects on Chang 7 shale oil in the study area. Among them, lithofacies, TOC content and average pore diameter have relatively obvious positive correlations with oil-bearing property indicators, which are the main controlling factors for shale oil enrichment. The “sweet spot” segment of shale oil enrichment can be predicted by integrating the heterogeneity characteristics of mud shale, oil-bearing property, brittleness index and movable oil evaluation criteria.

Key words: mud shale, heterogeneity, oil control effect, TOC, shale lithofacies, “sweet spot” evaluation, Chang 7, Triassic, Zhidan area, Ordos Basin

CLC Number:

TE122.2

GUO Yuxin, BAI Yubin, ZHAO Jingzhou, ZHANG Jun, CAO Dandan. Heterogeneity and oil control effects of Triassic Chang 7 shale in Zhidan area, Ordos Basin[J].Lithologic Reservoirs, 2026, 38(2): 97-110.

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TRENDMD:

岩相类型	样品编号	w（伊利石）/%	w（高岭石）/%	w（绿泥石）/%	w（伊蒙混层）/%
长英质泥岩	Z4	26.0	1.0	0	73.0
	Z29	45.0	10.0	33.0	12.0
	Z34	10.0	41.0	26.0	23.0
	Z28	65.0	1.0	23.0	11.0
黏土质泥岩	Z10	62.0	1.0	3.0	34.0
	Z11	25.0	10.0	10.0	55.0
	Z56	47.0	6.0	25.0	22.0
	Z59	77.0	0	13.0	10.0
混合质页岩	Z31	34.0	17.0	25.0	24.0
	Z33	56.0	9.0	21.0	14.0
	Z35	18.0	25.0	27.0	30.0
	Z1	9.0	7.0	28.0	56.0
	Z2	17.0	4.0	13.0	66.0
	Z3	14.0	4.0	12.0	70.0
	Z5	8.0	6.0	15.0	71.0
	Z7	11.0	13.0	20.0	56.0

“甜点” 等级	可压性		含油性		可动性
“甜点” 等级	脆性指数/%	非均质性结果（级差）	S₁/ （mg·g^-1）	非均质性结果（级差）	OSI/ （mg·g^-1· TOC ^-1）	非均质性结果（级差）
有利靶点类（一类）	≥ 60	1.44	≥ 5	1.19	> 100	1.73
潜在资源类（二类）	40~60	1.34	3~5	1.13	> 70	1.76
补充资源类（三类）	40~60	1.27	3~5	1.09	< 70	1.18

Heterogeneity and oil control effects of Triassic Chang 7 shale in Zhidan area, Ordos Basin

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