Lithofacies and reservoir characteristics of the Lower Cretaceous continental Shahezi Shale in the Changling Fault Depression of Songliao Basin, NE China

doi:10.1016/j.marpetgeo.2018.08.035

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	Lithofacies and reservoir characteristics of the Lower Cretaceous continental Shahezi Shale in the Changling Fault Depression of Songliao Basin, NE China
	Gao, Fenglin 1,2,3; Song, Yan 1,2,4; Li, Zhuo 1,2; Xiong, Fengyang 5; Chen, Lei 1,2,3; Zhang, Yinghan 1,2; Liang, Zhikai 1,2; Zhang, Xinxin 6; Chen, Zhiyuan 1,2,3; Joachim, Moortgat 5
刊名	MARINE AND PETROLEUM GEOLOGY
	2018-12-01
卷号	98 页码:401-421
关键词	Changling Fault Depression Shahezi Shale Lithofacies Whole-range pore size distribution Pore volume Specific surface area Controlling factor
ISSN号	0264-8172
DOI	10.1016/j.marpetgeo.2018.08.035
英文摘要	The increasing enthusiasm for continental shale gas exploration in China has made the Shahezi shale in the Changling Fault Depression an important research target due to its impressive demonstrated gas capacity. In this work, geochemical and petrologic analyses, field emission-scanning electron microscopy (FE-SEM) observation, low-pressure adsorption isotherms and mercury intrusion porosimetry (MIP) were conducted on 19 core samples to comprehensively analyze the reservoir characteristics of different lithofacies. The results show that the Shahezi shale has the characteristics of low content of organic matter (OM), high R-o, high content of clay minerals and small fractions of calcite. The kerogen is type III, dominated by vitrinite and inertinite. Clay minerals are dominated by the mixed illite-smectite, followed by illite and a small amount of chlorite. The Shahezi shale develops three kind of stratification structures according to the thickness of laminae: laminated structures, bedded structures, and massive structures. On the basis of TOC, mineral composition and petrologic texture, eight types of lithofacies were recognized. The organic pores show strong heterogeneity and are poorly developed, while clay-related pores are ubiquitous. The Shahezi shale has a high pore volume (PV) (0.005-0.031 ml/g, averaging 0.0173 ml/g) and specific surface area (SSA) (2.57-27.48 m(2)/g, averaging 16.61 m(2)/g), indicating an excellent storage capacity. Low-pressure CO2 and N-2 isotherms and MIP were utilized to construct the whole-range pore size distribution (PSD). Based on the whole-range PSDs, mesopores were observed to contribute most to the PV, followed by macropores. Micropores and mesopores account for more than 99% of SSA. The reservoir capacity of different lithofacies is following the order in terms of PV and SSA, from high to low: organic-medium massive mixed shale (OMMMS), organic-medium massive argillaceous shale (OMMAS), organic-rich laminated argillaceous shale (ORLAS), organic-medium laminated argillaceous shale (OMLAS), organic-rich bedded mixed shale (ORBMS), organic-rich bedded siliceous shale (ORBSS), organic-medium bedded argillaceous shale (OMBAS), organic-poor shale (OPS). The main controlling factors of pore structure for the Shahezi shale are clay minerals rather than OM, which is similar to the continental Chang 7th shale but contrary to the Longmaxi shale. However, the Shahezi shale is mainly of low TOC and strong heterogeneity pores development result from OM macerals, while the Chang 7th shale is mainly of low maturity. R-o play an important role in promoting pore development Only high content of calcite can greatly improve the pore space due to its solubility. This work contributes to the theory of continental shales and how to identify continental high-quality shale reservoirs.
资助项目	National Science and Technology Major Project[2016ZX05034001-005] ; Ohio State University's Subsurface Energy Resource Center
WOS关键词	UNCONVENTIONAL HYDROCARBON RESOURCES ; PORE STRUCTURE CHARACTERIZATION ; MISSISSIPPIAN BARNETT SHALE ; GAS-STORAGE CAPACITY ; ORDOS BASIN ; LACUSTRINE SHALE ; ORGANIC-MATTER ; SICHUAN BASIN ; LONGMAXI FORMATIONS ; ALBANY SHALE
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000451360000026
资助机构	National Science and Technology Major Project ; National Science and Technology Major Project ; Ohio State University's Subsurface Energy Resource Center ; Ohio State University's Subsurface Energy Resource Center ; National Science and Technology Major Project ; National Science and Technology Major Project ; Ohio State University's Subsurface Energy Resource Center ; Ohio State University's Subsurface Energy Resource Center ; National Science and Technology Major Project ; National Science and Technology Major Project ; Ohio State University's Subsurface Energy Resource Center ; Ohio State University's Subsurface Energy Resource Center ; National Science and Technology Major Project ; National Science and Technology Major Project ; Ohio State University's Subsurface Energy Resource Center ; Ohio State University's Subsurface Energy Resource Center
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/89635]
专题	地质与地球物理研究所_其他部门
通讯作者	Song, Yan; Li, Zhuo
作者单位	1.China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China 2.China Univ Petr, Unconvent Nat Gas Inst, Beijing 102249, Peoples R China 3.China Univ Petr, Unconvent Oil & Gas Cooperat Innovat Ctr, Beijing 102249, Peoples R China 4.Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China 5.Ohio State Univ, Sch Earth Sci, Columbus, OH 43210 USA 6.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Gao, Fenglin,Song, Yan,Li, Zhuo,et al. Lithofacies and reservoir characteristics of the Lower Cretaceous continental Shahezi Shale in the Changling Fault Depression of Songliao Basin, NE China[J]. MARINE AND PETROLEUM GEOLOGY,2018,98:401-421.
APA	Gao, Fenglin.,Song, Yan.,Li, Zhuo.,Xiong, Fengyang.,Chen, Lei.,...&Joachim, Moortgat.(2018).Lithofacies and reservoir characteristics of the Lower Cretaceous continental Shahezi Shale in the Changling Fault Depression of Songliao Basin, NE China.MARINE AND PETROLEUM GEOLOGY,98,401-421.
MLA	Gao, Fenglin,et al."Lithofacies and reservoir characteristics of the Lower Cretaceous continental Shahezi Shale in the Changling Fault Depression of Songliao Basin, NE China".MARINE AND PETROLEUM GEOLOGY 98(2018):401-421.