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DOI	10.2516/ogst/2021015
	The formation mechanism of authigenic chlorite in tight sandstone and its effect on tight oil adsorption during hydrocarbon filling
	Zhou, Qianshan; Li, Chao; Chen, Guojun; Lyu, Chengfu; Qu, Xuefeng; Ma, Xiaofeng; Li, Chengze; Lei, Qihong; Xie, Qichao
通讯作者	Li, C (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China. ; Li, C (通讯作者)，Key Lab Petr Resources Res, Lanzhou 730000, Gansu, Peoples R China.
发表日期	2021
ISSN	1294-4475
EISSN	1953-8189
卷号	76
英文摘要	Authigenic chlorite, which is frequently found in sandstone, has a controlling effect on the reservoirs in which tight oil is adsorbed during hydrocarbon filling. In this study, the content, occurrence state, timing, mechanism and influence of authigenic chlorite on the micro-occurrence states of tight oil were studied using Thin Section (TS), Fluorescent Thin Section (FTS), X-Ray Diffraction (XRD), Field Emission-Scanning Electron Microscopy (FE-SEM), Environmental Scanning Electron Microscopy (ESEM), and Energy Dispersive Spectroscopy (EDS). The results indicate: (1) a spatial coupling between chlorite development, a brackish water delta front facies depositional environment, and biotite-rich arkosic sandstone. (2) Authigenic chlorite can be divided into three types: grain-coating chlorite, pore-lining chlorite, and rosette chlorite. Chlorite forms after early compaction but before other diagenetic phases, and grows via precipitation from pore waters that contain products released during the dissolution of volcanic rock fragments and biotites. Porewater is also pressure-released from feldspars and mudstone. (3) The micro-occurrence states of tight oil can be divided into five types: emulsion form, cluster form, throat form, thin-film form, and the isolated or agglomerated particle form. (4) During hydrocarbon filling, tight oil mainly occurs on the surface of grain-coating and pore-lining chlorite in the form of a thin film, the granular or agglomerated forms are mainly enriched within the intercrystalline pores within the authigenic chlorite, and the cluster forms are mainly enriched in dissolution pores. Isolated or agglomerated particles of tight oil primarily occur in the intercrystalline pores of the rosette chlorite. (5) The specific surface area and the authigenic chlorite's adsorption potential of authigenic chlorite control the micro-occurrence of tight oil on the surface of the chlorite and in intercrystalline pores. The adsorption capacity of chlorite lies in the following order: pore-lining chlorite intercrystalline pores > rosette chlorite > chlorite in feldspar dissolution pores > pore-lining chlorite surface > grain-coating chlorite intercrystalline pores > grain-coating chlorite surface.
关键词	TRIASSIC YANCHANG FORMATION PORE-LINING CHLORITE RESERVOIR QUALITY ORDOS BASIN GAS POROSITY CEMENTS DEPRESSION ORIGIN GROWTH
语种	英语
WOS研究方向	Energy & Fuels ; Engineering
WOS类目	Energy & Fuels ; Engineering, Chemical ; Engineering, Petroleum
WOS记录号	WOS:000662780400003
来源期刊	OIL & GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/253870
作者单位	[Zhou, Qianshan; Li, Chao; Chen, Guojun; Lyu, Chengfu; Ma, Xiaofeng; Li, Chengze] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; [Zhou, Qianshan; Li, Chao; Chen, Guojun; Lyu, Chengfu] Key Lab Petr Resources Res, Lanzhou 730000, Gansu, Peoples R China; [Qu, Xuefeng; Lei, Qihong; Xie, Qichao] PetroChina Changqing Oil Field Co, Xian 710000, Peoples R China; [Qu, Xuefeng; Lei, Qihong; Xie, Qichao] Natl Engn Lab Explorat & Dev Low Permeabil Oil&F, Xian 710000, Peoples R China; [Li, Chengze] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Qianshan,Li, Chao,Chen, Guojun,et al. The formation mechanism of authigenic chlorite in tight sandstone and its effect on tight oil adsorption during hydrocarbon filling[J]. 中国科学院西北生态环境资源研究院,2021,76.
APA	Zhou, Qianshan.,Li, Chao.,Chen, Guojun.,Lyu, Chengfu.,Qu, Xuefeng.,...&Xie, Qichao.(2021).The formation mechanism of authigenic chlorite in tight sandstone and its effect on tight oil adsorption during hydrocarbon filling.OIL & GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES,76.
MLA	Zhou, Qianshan,et al."The formation mechanism of authigenic chlorite in tight sandstone and its effect on tight oil adsorption during hydrocarbon filling".OIL & GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES 76(2021).