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

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]