Whole-aperture characteristics and controlling factors of pore structure in the Chang 7th continental shale of the Upper Triassic Yanchang Formation in the southeastern Ordos Basin, China

doi:10.1190/INT-2017-0090.1

	Whole-aperture characteristics and controlling factors of pore structure in the Chang 7th continental shale of the Upper Triassic Yanchang Formation in the southeastern Ordos Basin, China
	Yang, Wei 1,2; Song, Yan 1,2; Jiang, Zhenxue 1,2; Luo, Qun 1,2; Wang, Qianyou 1,2; Yuan, Yuan 3; Zhang, Chen 1,2; Chen, Lei 1,2
刊名	INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION
	2018-02-01
卷号	6 期号:1 页码:T175-T190
ISSN号	2324-8858
DOI	10.1190/INT-2017-0090.1
英文摘要	Quantitative assessment is still lacking on the pore-sizes distribution of micropores and mesopores, and the major controlling factors remain enigmatic for the continental Chang 7th shale reservoirs in southeastern Ordos Basin. In this study, scanning electron microscopy, organic geochemical analysis, low-temperature gas adsorption, high-pressure mercury injection, and X-ray diffraction analysis were conducted on 29 core samples from representative eight wells in the Xiasiwan-Yanchang area, yielding a particular investigation on characteristics and controlling factors of the structure in the Chang 7th shale. The Chang 7th shale is mainly characterized by organic and secondary micropore and mesopore, respectively, ranging the peaks of pore size from 0.35 to 0.65 nm, 0.75 to 1.00 nm, 1.10 to 1.35 nm, and from 4 to 13 nm. Whole-aperture characterization of the pore structure shows that meso- and macropores demonstrate a major contribution to total pore volume (PV), and the surface area is mainly provided by micro- and mesopores with pore radii less than 20 nm. A weak positive variation was identified between the PV of micromesopores and total organic carbon content, implying that micropores are currently in the process of developing. The micromesopore specific surface area and volume, respectively, yield a significant positive and weak variation with the quartz and clay mineral content, suggesting that siliceous minerals are favorable for micromesopore development. The infusion of siliceous biogenic debris and silica-replaced carbonate biogenic debris from the northeastern and southwestern source areas, respectively, is likely responsible for development of biogenic siliceous minerals in the Chang 7th shale. Furthermore, the hollow cavities in siliceous organisms have considerably contributed to the preservation of primary pores owing to their characteristic skeleton-supported framework.
资助项目	National Science and Technology Major Project[2016ZX05034-001] ; National Science and Technology Major Project[2017ZX05035-002] ; Science Foundation of China University of Petroleum, Beijing[2462014YJRC023] ; Science Foundation for top-notch innovative talents of China University of Petroleum, Beijing[2462017BJB07] ; Foundation of State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing[PRP/indep-4-1406] ; National Natural Science Foundation of China[ZX20160343] ; National Science and Technology Major Project Foundation of China "Occurrence and enrichment of shale gas in different types of Mesozoic basins in China"[2016ZX05034001-005] ; National 973 Technology Project "Desert origin and fine labeling of continental tight oil"[2015CB250901]
WOS关键词	SILURIAN LONGMAXI FORMATION ; GAS-ADSORPTION ; ELECTRON-MICROSCOPY ; METHANE SORPTION ; WOODFORD SHALE ; SICHUAN BASIN ; SURFACE-AREA ; SOURCE ROCKS ; RESERVOIRS ; POROSITY
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SOC EXPLORATION GEOPHYSICISTS
WOS记录号	WOS:000443642000029
资助机构	National Science and Technology Major Project ; Science Foundation of China University of Petroleum, Beijing ; Science Foundation for top-notch innovative talents of China University of Petroleum, Beijing ; Foundation of State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing ; National Natural Science Foundation of China ; National Science and Technology Major Project Foundation of China "Occurrence and enrichment of shale gas in different types of Mesozoic basins in China" ; National 973 Technology Project "Desert origin and fine labeling of continental tight oil" ; National Science and Technology Major Project ; Science Foundation of China University of Petroleum, Beijing ; Science Foundation for top-notch innovative talents of China University of Petroleum, Beijing ; Foundation of State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing ; National Natural Science Foundation of China ; National Science and Technology Major Project Foundation of China "Occurrence and enrichment of shale gas in different types of Mesozoic basins in China" ; National 973 Technology Project "Desert origin and fine labeling of continental tight oil" ; National Science and Technology Major Project ; Science Foundation of China University of Petroleum, Beijing ; Science Foundation for top-notch innovative talents of China University of Petroleum, Beijing ; Foundation of State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing ; National Natural Science Foundation of China ; National Science and Technology Major Project Foundation of China "Occurrence and enrichment of shale gas in different types of Mesozoic basins in China" ; National 973 Technology Project "Desert origin and fine labeling of continental tight oil" ; National Science and Technology Major Project ; Science Foundation of China University of Petroleum, Beijing ; Science Foundation for top-notch innovative talents of China University of Petroleum, Beijing ; Foundation of State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing ; National Natural Science Foundation of China ; National Science and Technology Major Project Foundation of China "Occurrence and enrichment of shale gas in different types of Mesozoic basins in China" ; National 973 Technology Project "Desert origin and fine labeling of continental tight oil"
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88460]
专题	中国科学院地质与地球物理研究所
通讯作者	Yang, Wei
作者单位	1.China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing, Peoples R China 2.China Univ Petr, Unconvent Nat Gas Inst, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Yang, Wei,Song, Yan,Jiang, Zhenxue,et al. Whole-aperture characteristics and controlling factors of pore structure in the Chang 7th continental shale of the Upper Triassic Yanchang Formation in the southeastern Ordos Basin, China[J]. INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION,2018,6(1):T175-T190.
APA	Yang, Wei.,Song, Yan.,Jiang, Zhenxue.,Luo, Qun.,Wang, Qianyou.,...&Chen, Lei.(2018).Whole-aperture characteristics and controlling factors of pore structure in the Chang 7th continental shale of the Upper Triassic Yanchang Formation in the southeastern Ordos Basin, China.INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION,6(1),T175-T190.
MLA	Yang, Wei,et al."Whole-aperture characteristics and controlling factors of pore structure in the Chang 7th continental shale of the Upper Triassic Yanchang Formation in the southeastern Ordos Basin, China".INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION 6.1(2018):T175-T190.