Fracture development degree characterization method

Abstract

The invention discloses a fracture development degree characterization method, which comprises the following steps that: a high-resolution sequence stratigraphy method is adopted to determine the calculation step length of fracture strength, and the value of the calculation step length is a sedimentary cycle thickness similar to seismic data identification accuracy; crack basic parameters comprising the number of cracks and crack inclination angles are acquired; the crack linear density and the crack apparent cutting ratio are quantitatively calculated through a fixed step length and windowingmethod, the crack linear density is the ratio of the number of cracks in the calculation step length to the calculation step length, and the crack apparent cutting ratio is the ratio of the sum of tangent values of crack inclination angles in the calculation step length to the calculation step length; and the fracture development degree of the single-well coring well section is characterized according to the fracture linear density and the fracture apparent cutting ratio. On the basis of research of a high-resolution sequence stratigraphy method, the definition of the linear length in the fracture linear density is perfected by clearly calculating the step length, and the fracture development degree difference caused by the fracture inclination angle difference is solved by adopting fracture apparent cutting ratio quantitative characterization.

Description

technical field [0001] The invention relates to the technical field of fracture research, in particular to a method for characterizing the degree of fracture development. Background technique [0002] Accurate characterization of fracture development degree is the basic and important link in fracture research. The results of this link will directly affect the conclusion of follow-up work in fracture research. The established characterization methods and standards must have the principles of analogy, predictability, and quantification. Accurate and effective characterization of fracture development strength is of great significance to fracture research. [0003] How to accurately characterize the degree of fracture development has not been conclusive. Different scholars have proposed different evaluation schemes or standards for the degree of fracture development based on the fracture development characteristics and evaluation parameters of field outcrops, cores, and imaging ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages existing in the prior art that a scientific and complete fracture development degree system cannot be established, which cannot provide accurate guidance and reference for oil and gas field exploration and development, thus causing adverse effects on in-depth research on oil and gas field exploration and development. , to provide a characterization method for fracture development degree, to achieve analogous, predictable and quantitative characterization of fractures

Images