气候变化领域集成服务门户(CCPortal): Structural features and genesis of microscopic pores in lacustrine shale in an oil window: A case study of the Dongying depression

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DOI	10.1306/1218181522717084
	Structural features and genesis of microscopic pores in lacustrine shale in an oil window: A case study of the Dongying depression
	Zhang L.; Chen Z.; Li Z.; Zhang S.; Li J.; Liu Q.; Zhu R.; Zhang J.; Bao Y.
发表日期	2019
ISSN	0149-1423
卷号	103 期号:8
英文摘要	The Paleogene shale of the Dongying depression, a continental basin in eastern China, is taken as the study subject to examine the microscopic features of lacustrine shale reservoirs in the oil window. This study shows that shale pores in this evolutionary stage are present at the micrometer to nanometer scale, but fractures commonly have extension distances at the millimeter scale. Pores and fractures can be divided into three types, namely, primary pores, secondary pores, and cracks. Primary pores commonly have good connectivity at shallow burial depth. With the increase of burial depth, primary porosity is reduced because of compaction and cementation. Secondary pores are important in shale, including dissolved pores inside grains and at grain edge, and dissolution pores inside the hybrid of organic matter (OM) and clayminerals, and evaporite minerals, including carbonates or sulfates. Types of cracks were observed: bedding fissures, dissolution fractures, and structural fractures. The development of bedding fissures is related to the deposition of shale laminae. The formation of dissolution fractures is related to acidic fluids, such as organic acids and hydrogen sulfide, whereas the formation of structural fractures is jointly controlled by fault development, fluid overpressure, and lithofacies. The pores and fractures in the oil window of lacustrine shale can store and channel oil and gas. The hybrid OM-clay-carbonate (sulfate) and the pores inside are important through the oil window. Moreover, the development of the pores depends not only on hydrocarbon generation but also on the interaction of hydrocarbons and organic acid dissolution. This finding has important significance in the accumulation of oil and gas in continental shales. Copyright © 2019. The American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Cracks; Dissolution; Fracture; Hydrocarbons; Organic acids; Organic minerals; Petroleum reservoir engineering; Sulfur compounds; Dongying depression; Hydrocarbon generation; Microscopic features; Organic acid dissolutions; Pores and fractures; Shallow burial depths; Structural feature; Structural fracture; Shale; dissolution; hydrocarbon generation; hydrocarbon reservoir; hydrogen sulfide; organic acid; Paleogene; shale; China; Dongying Depression; Shandong
来源期刊	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/125062
作者单位	Exploration and Development Research Institute of Shengli Oilfield, Sinopec, Dongying, Shandong, China; State Key Laboratory of Continental Dynamics, Northwest University, Xi'an, Shaanxi, China; Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, Shandong University of Science and Technology, Qingdao, China; School of Geoscience, China University of Petroleum (East China), Huangdao, Qingdao, China
推荐引用方式 GB/T 7714	Zhang L.,Chen Z.,Li Z.,et al. Structural features and genesis of microscopic pores in lacustrine shale in an oil window: A case study of the Dongying depression[J],2019,103(8).
APA	Zhang L..,Chen Z..,Li Z..,Zhang S..,Li J..,...&Bao Y..(2019).Structural features and genesis of microscopic pores in lacustrine shale in an oil window: A case study of the Dongying depression.AAPG Bulletin,103(8).
MLA	Zhang L.,et al."Structural features and genesis of microscopic pores in lacustrine shale in an oil window: A case study of the Dongying depression".AAPG Bulletin 103.8(2019).