IMECH-IR  > 非线性力学国家重点实验室
Characteristics and the formation mechanism of the heterogeneous microfractures in the tight oil reservoir of Ordos Basin, China
Du SH(杜书恒)
Corresponding AuthorDu, Shuheng(dushuheng@imech.ac.cn)
Source PublicationJOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
2020-08-01
Volume191Pages:11
ISSN0920-4105
AbstractThis 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.
KeywordMicrofracture Formation mechanism Tight oil Sandstone Characterization
DOI10.1016/j.petrol.2020.107176
Indexed BySCI ; EI
Language英语
WOS IDWOS:000536835200013
WOS KeywordSANDSTONE RESERVOIR ; FRACTURE NETWORK ; PERMEABILITY ; INSPIRATION ; SIMULATION ; ANISOTROPY ; MODELS ; SHALE ; FLOW
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Petroleum
Funding ProjectNational 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]
Funding OrganizationNational 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)
Classification一类
Ranking1
ContributorDu, Shuheng
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/82073
Collection非线性力学国家重点实验室
AffiliationChinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
Recommended Citation
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.
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