Fault System and Its Controlling Effect on Fracture Distribution in Moxi-Gaoshiti Block, Sichuan Basin, China

doi:10.11885/j.issn.1674-5086.2018.01.10.01

Abstract

Abstract: In order to determine the fault and fracture distribution characteristics of the Moxi-Gaoshiti block, faults were classified into different types and levels based on geomechanical theory and seismic, logging, core, and relevant experimental data. Fractures were quantitatively predicted, and the relationship between the distributions of faults and fractures was established. The results showed that the faults in the Moxi-Gaoshiti block have a large scale in the vertical direction, long extensions, a large number of disconnected layers, and obvious delamination. They can be divided into 3 structural layers, and have significant plane partitioning and banding. Faults with different scales, directions, and characteristics have significant influences on fracture distribution. Fracture density is generally 1.5~5.0/m with a maximum of 7.0/m. Zones with high values are primarily distributed in the fault and its periphery. The maximum fracture opening in the fault development zone can reach 3 mm. The Moxi-Gaoshiti block is a fault-fracture symbiotic system. The primary fault controls the development of secondary faults and fractures, and the secondary fault controls the development of local fractures.

Key words: fault analysis, fracture distribution, numerical simulation, Longwangmiao formation, Moxi-Gaoshiti block

CLC Number:

TE122

XU Ke, DAI Junsheng, FENG Jianwei, REN Qiqiang. Fault System and Its Controlling Effect on Fracture Distribution in Moxi-Gaoshiti Block, Sichuan Basin, China[J]. 西南石油大学学报(自然科学版), 2019, 41(2): 10-22.

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