A Method for Quantitative Characterization of Fracture Mechanics Properties Based on Structural Style Analysis

Abstract

A method for quantitatively characterizing fracture mechanical properties based on structural style analysis: based on 3D seismic data, coherent data volume and curvature data volume data, read the structural style characteristics related to the fault; Select five types of structural styles that can reflect the properties of fracture mechanics, and establish a detailed structural style database; through the establishment of membership functions and evaluation matrices, obtain the weight coefficients and degrees of membership of the five structural styles, and initially realize the transformation of geological characteristics into quantitative data; Based on the weight coefficients of five types of structural styles and the degree of membership of a single structural style, a quantitative evaluation mathematical model is established to obtain the numerical value of the mechanical properties of each breakpoint; based on the numerical value of the mechanical properties of each breakpoint, the mechanical properties of each main fracture are drawn using Petrel software Numerical plane distribution map, completes the division of quantitative evaluation standards for fracture mechanics properties of continental faulted basins. The invention can efficiently, accurately and quantitatively characterize the properties of fractures.

Description

technical field [0001] The invention relates to a method for analyzing and quantitatively characterizing the mechanical properties of a fault zone. In particular, it relates to a method for quantitatively characterizing fracture mechanical properties based on structural style analysis. Background technique [0002] The development and evolution of Cenozoic continental fault-depressed hydrocarbon-bearing basins in eastern China are generally controlled by the dual tectonic effects of horizontal extension caused by mantle upwelling and strike-slip shear caused by the activity of the Tan-Lu fault zone (Ma Xingyuan, 1983; Xu Jiawei, 1995 ; Qi Jiafu, 2014; et al.), resulting in the development of faults in the basin and the complex and diverse nature of the faults, which also leads to the fact that the complex control of faults has always been a hot and difficult research topic. [0003] In recent years, with the continuous deepening of exploration and development research in Bo...

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Problems solved by technology

However, the scale of in-situ stress generated by plate movement is relatively large, and there will be some differences in the release of stress on the target faults in the actual exploration practice. In-situ stress is nothing more than tensile stress, torsional (shear) or What is experienced in the process is not all a single in-situ stress, but more of a composite superposition of two or even three stresses, which also makes the judgment of fracture mechanics properties more complicated

[0005] Taking the Cenozoic faults in faulted basins in eastern China as an example, based on the dual dynamic background of strike-slip and shear, predecessors qualitatively divided the mechanical properties of fractures into tension, tension-torsion (or torsion tension), There are three types of strike-slip (Qi Jiafu, 2004; Yu Yixin, 2012; Wu Zhiping, 2013; etc.), but this classification scheme does not clearly define the basis and standard of classification, and it is easily subject to changes in human subjective cognition during the application process

The qualitative understanding of this "ambiguous" can no longer meet the increasingly refined needs of exploration and development. Therefore, it will be an important direction for future exploration and development to transform the qualitative geological understanding of fracture mechanics properties into quantitative numerical representation.

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