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Characteristics and the formation mechanism of the heterogeneous microfractures in the tight oil reservoir of Ordos Basin, China

文献类型：期刊论文

作者Du SH(杜书恒)
刊名JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
出版日期2020-08-01
卷号191页码:11
ISSN号0920-4105
关键词Microfracture Formation mechanism Tight oil Sandstone Characterization
DOI10.1016/j.petrol.2020.107176
通讯作者Du, Shuheng(dushuheng@imech.ac.cn)
英文摘要This study aims to investigate the characteristics and the formation mechanism of the heterogeneous microfractures in the upper Triassic Yanchang Formation tight oil reservoir of Ordos Basin, China with some new perspectives. In this paper, we define two sets of parameters describing the size and geometry of microfractures by using Feret diameter calculation and Legendre ellipse fitting. Then the unidirectional fracture zone and multidirectional fracture zone are also be defined. Results of the microfractures characterization show that when the lengths of microfractures are less than 600 mu m (and the widths are less than 90 mu m), the above two set of data show a good linear positive correlation, but when the lengths of microfractures continue to increase, the widths of microfractures begin to deviate from the linear relationship and gradually diverge. This indicates that the lengths and widths of microfractures are not strictly and steadily correlated, but their correlation has a threshold value. If the lengths of microfractures increase due to the change of internal or external stress, when the length value is higher than a certain value, the opening process of microfractures will begin to lose stability, and the widths will change gradually irregularly. Once the compaction process reach a certain extent, some of the microfractures opened previously will be temporarily closed, which will greatly promote the process of pressure-solution, and thus increase the microfracture tortuosity. The length, width, solidity and boundary tortuosity of microfractures could be used to distinguish two zones include the multi-directional fracture zone from the unidirectional fracture zone. The conclusion would provide the important scientific basis for the EOR applications of tight oil.
分类号一类
WOS关键词SANDSTONE RESERVOIR ; FRACTURE NETWORK ; PERMEABILITY ; INSPIRATION ; SIMULATION ; ANISOTROPY ; MODELS ; SHALE ; FLOW
资助项目National Natural Science Foundation of China (NSFC)[41902132] ; National Natural Science Foundation of China (NSFC)[11872363] ; National Natural Science Foundation of China (NSFC)[51861145314] ; Open Fund of Key Laboratory of Oil and Gas Resources Research[KLOR2018-6] ; Chinese Academy of Sciences, Chinese Academy of Sciences (CAS) through the CAS Key Research Program of Frontier Sciences[QYZDJ-SSW-JSC019] ; CAS Strategic Priority Research Program[XDB22040401] ; Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology)[PLC20190401]
WOS研究方向Energy & Fuels ; Engineering
语种英语
WOS记录号WOS:000536835200013
资助机构National Natural Science Foundation of China (NSFC) ; Open Fund of Key Laboratory of Oil and Gas Resources Research ; Chinese Academy of Sciences, Chinese Academy of Sciences (CAS) through the CAS Key Research Program of Frontier Sciences ; CAS Strategic Priority Research Program ; Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology)
其他责任者Du, Shuheng
源URL[http://dspace.imech.ac.cn/handle/311007/82072]  
专题力学研究所_非线性力学国家重点实验室
作者单位Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714		 Du SH. Characteristics and the formation mechanism of the heterogeneous microfractures in the tight oil reservoir of Ordos Basin, China[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2020,191:11.
APA 杜书恒.(2020).Characteristics and the formation mechanism of the heterogeneous microfractures in the tight oil reservoir of Ordos Basin, China.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,191,11.
MLA 杜书恒."Characteristics and the formation mechanism of the heterogeneous microfractures in the tight oil reservoir of Ordos Basin, China".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 191(2020):11.

入库方式： OAI收割

来源：力学研究所

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