Title: Multi parameter fusion fracture comprehensive identification based on calibration data: a case study of shale reservoirs in southern Ordos

Authors: Jiaqi Sun; Kesai Li; Di Wang; Naihui Wang; Yufei Yang; Xianhong He; Jie Wang; Zehou Xiang

Addresses: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, National Energy Shale Oil Research and Development Center, College of Energy (College of Modern Shale Gas Industry), Chengdu University of Technology, Beijing, Chengdu, China ' College of Energy (College of Modern Shale Gas Industry), Chengdu University of Technology, Chengdu, China ' State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, National Energy Shale Oil Research and Development Center, Beijing, China ' School of Earth Resources, China University of Geosciences (Wuhan), Wuhan, China ' Sinopec North China Petroleum Bureau, No. 2 Gas Production Plant of Huabei Oil and Gas Company, Xianyang, China ' Geophysical R&D Institute, China Oilfield Services Limited, Zhanjiang, China ' College of Energy (College of Modern Shale Gas Industry), Chengdu University of Technology, Chengdu, China ' College of Energy (College of Modern Shale Gas Industry), Chengdu University of Technology, Chengdu, China

Abstract: As a migration channel and storage space for oil and gas, fractures are the key to oil and gas exploration and development. Due to the small scale and complex development of shale reservoir fractures, it is difficult to identify and characterise them quantitatively, so it is necessary to carry out shale fracture logging and identification. In this paper, the fracture characteristics of shale reservoirs are analysed based on core, imaging and conventional logging data in the Ordos Basin. The stratigraphic data were corrected by forward simulation, and the identification criteria were established by using the intrusion difference ratio, grey correlation degree and comprehensive fracture index method, with an identification accuracy of more than 80%. When the index is greater than 0.15, the fracture development is in good agreement with the actual fracture development, which can be used for shale fracture identification and lay the foundation for shale oil and gas exploration and development. [Received: August 16, 2024; Accepted: March 7, 2025]

Keywords: Ordos basin; shale fractures; intrusion difference ratio; grey correlation; fracture comprehensive index.

DOI: 10.1504/IJOGCT.2026.151699

International Journal of Oil, Gas and Coal Technology, 2026 Vol.39 No.2, pp.157 - 176

Received: 17 Jun 2024
Accepted: 07 Mar 2025
Published online: 16 Feb 2026 *

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