泥岩与页岩地化特征对比——以鄂尔多斯盆地安塞地区延长组7段为例

doi:10.11743/ogg20200601

Abstract

Abstract:

High-quality shale and mudstone source rocks are developed in the 7^th member of Yanchang Formation (Chang 7 member) in Ansai area within the Ordos Basin.A study of geochemical differences of the two rocks was considered necessary for evaluating their quality and identifying their contributions to oil and gas reservoirs.A core description of the Chang 7 member was then carried out based on 25 key exploration wells and a geochemical comparison of the rocks was also performed based on 81 mudstone and shale samples gathered from the member in the wells.The results show that both shale and mudstone samples are good source rocks with their thermal maturation and organic matter abundance values within favorable ranges, except that the shale samples are dominated by Types Ⅰ and Ⅱ₁ organic matters whereas the mudstone samples are dominated by Types Ⅱ₁ and Ⅱ₂ organic matters.Compared with mudstone in terms of geochemical features, shale has significantly higher abundance of organic matter with more shale samples having TOC values greater than 4% and is more oil-prone as it contains higher content of sapropel.Shale also has higher contents of free and pyrolysis hydrocarbons and greater hydrocarbon-generating potential than mudstone.However, it should be noted that the occurrence of more pores and micro-fractures in shale may have a greater impact on the content measurements of free hydrocarbon.Compared with shale, in which pores and micro-fractures are easily developed and serve as pathways for hydrocarbon expulsion and migration, mudstone demonstrates stronger retention capacity for hydrocarbons.In addition, there is no significant difference between shale and mudstone in terms of biomarker parameters.

Key words: mudstone, shale, geochemical difference, Yanchang Formation, Ansai area, Ordos Basin

CLC Number:

TE122.1

Bojiang Fan, Qiliang Mei, Xiaojun Wang, Yue Meng, Qijiang Huang. Geochemical comparison of mudstone and shale—A case study of the 7^th member of Yanchang Formation in Ansai area, Ordos Basin[J]. Oil & Gas Geology, 2020, 41(6): 1119-1128.

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	参数	TOC/%	(S₁+S₂)/ (mg·g^-1)	氯仿沥青“A”含量/%	总烃含量/10^-6	R_o/%	有机质类型
泥岩	数值范围	0.88~9.86	2.2~21.72	0.05~1.04	129.52~7282.20	0.72~1.10	Ⅱ₁与Ⅱ₂型为主
	平均数值	2.81	7.60	0.53	3569.44	0.87
	样品数/个	19	30	30	30	14
	评价	好	好	好	好
页岩	数值范围	0.86~10.81	3.00~32.41	0.33~1.48	253.95~8916.37	0.73~1.12	Ⅰ型与Ⅱ₁型为主
	平均数值	3.57	11.21	0.51	3208.80	0.94
	样品数/个	40	40	40	40	35
	评价	好	好	好	好

生标参数	泥岩(样品数17个)		页岩(样品数33个)
生标参数	数值范围	平均值	数值范围	平均值
伽马蜡烷/C₃₀藿烷	0.07~0.39	0.20	0.06~0.42	0.24
CPI(碳优势指数)	1.05~1.11	1.08	1.05~1.11	1.05
OEP(奇偶优势指数)	0.99~1.07	1.02	0.98~1.07	0.99
Ts/(Ts+Tm)	0.39~0.89	0.72	0.08~0.90	0.60
C₃₀重排藿烷/C₂₉Ts	0.58~4.85	2.31	0.60~6.87	2.05
C₃₁升藿烷22S/ (22S+22R)	0.41~0.59	0.50	0.30~0.59	0.49
C₃₂升霍烷22S/ (22S+22R)	0.52~0.58	0.56	0.45~0.60	0.53
孕甾烷/升孕甾烷	0.00~5.72	2.54	0~20.32	3.46
(孕甾烷+升孕甾烷)/ ααα20RC₂₉甾烷	0.08~3.40	1.68	0.07~4.41	1.47
C₂₉甾烷ββ/(αα+ββ)	0.27~0.50	0.42	0.24~0.52	0.38
αααC₂₉甾烷S/(S+R)	0.39~0.62	0.53	0.30~0.73	0.48
8β(H)-补身烷/ 8β(H)-升补身烷	0.79~1.61	1.23	0.79~3.17	1.51
Pr/Ph	1.22~2.17	1.64	1.22~2.17	1.65
C₂₇/C₂₉规则甾烷	0.40~0.78	0.56	0.39~1.24	0.65
Pr/nC₁₇	0.16~0.62	0.3	0.16~0.62	0.27
Ph/nC₁₈	0.09~0.25	0.14	0.09~0.25	0.14
C₂₇/(C₂₇+C₂₈+C₂₉)规则甾烷	0.20~0.28	0.24	0.19~0.40	0.27
C₂₈/(C₂₇+C₂₈+C₂₉)规则甾烷	0.26~0.37	0.33	0.17~0.40	0.30
C₂₉/(C₂₇+C₂₈+C₂₉)规则甾烷	0.36~0.52	0.43	0.35~0.54	0.43

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Geochemical comparison of mudstone and shale—A case study of the 7^th member of Yanchang Formation in Ansai area, Ordos Basin

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Geochemical comparison of mudstone and shale—A case study of the 7^th member of Yanchang Formation in Ansai area, Ordos Basin