Multi-stage fracture characteristics and determination of stages in Ordovician carbonate reservoirs of the Tarim Basin

doi:10.3969/j.issn.1006-6535.2025.06.005

Abstract

Abstract: Aiming at the challenges of deep burial, complex stages and difficulty in quantitative characterization of fractures in Ordovician carbonate reservoirs in the Tarim Basin, taking typical outcrops in northwestern Tarim as research objects, digital outcrop characterization technology was used to systematically identify and describe fractures. Based on fracture occurrence statistics and structural trace analysis, the superposition relationships of multiple fracture sets were analyzed. Through carbon-oxygen isotope analysis, acoustic emission experiments,other testing methods, the main fracture-forming stages and stress field evolution characteristics of outcrop fractures were determined. The study shows that fractures in the northwestern Tarim outcrop area can be divided into multiple sets based on strike: 330°fracture set, 270°fracture set, 250°and 210° fracture sets, 300°and 0° fracture sets, etc. Their formation corresponds to Middle Caledonian, Late Caledonian-Early Hercynian, Late Hercynian-Indosinian, and Himalayan,four main tectonic stages.After comparing the fracture development characteristics of the Halahatang Oilfield, it was clarified that the reservoir mainly develops three stages of tectonic fractures and the quantitative distribution law of multi-stage fractures was revealed. Compared with the fracture parameters interpreted by imaging logging, the average compliance rate reached 80%. The research conclusions confirm the effectiveness of outcrop studies in determining the stages of subsurface reservoir fractures and can provide reliable geological basis for the exploration and development of karst fracture-cavity reservoirs in the Tarim Basin.

Key words: carbonate rock, multi-stage fractures, fracture stages, tectonic evolution, tectonic stress field, Ordovician, Tarim Basin

CLC Number:

TE121

DU He, FENG Jianwei, WAN Dongping, XU Shouyu, XING Huilin. Multi-stage fracture characteristics and determination of stages in Ordovician carbonate reservoirs of the Tarim Basin[J]. Special Oil & Gas Reservoirs, 2025, 32(6): 40-49.

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