Quantitative prediction method and device for carbonate fracture density

Abstract

The invention provides a quantitative prediction method and device for the crack density of carbonate rocks. The method comprises the following steps: calculating the crack density of a correspondingdrilled well point by utilizing imaging logging information; calculating a difference value between stratum wave impedance and rack framework wave impedance based on acoustic logging information, density acoustic logging and a three-dimensional post-stack seismic data body; extracting a seismic attribute body from the three-dimensional post-stack seismic data body based on the difference value andthe crack density; dividing all drilled wells into training wells and inspection wells which are used as a training well data set and an inspection well data set respectively; training a probabilistic neural network model corresponding to seismic attributes with different quantities by utilizing the training well data set; determining an optimal attribute set for quantitative prediction by utilizing inspection errors of an inspection data set and the inspection wells; calculating a quantitative data body of the crack density of the carbonate rocks according to the optimal attribute set and the probabilistic neural network model. The quantitative prediction method and device can realize quantitative description of a three-dimensional space of crack development density.

Description

technical field [0001] The invention relates to a fracture detection technology of carbonate rock reservoirs, in particular to a method and device for quantitatively predicting the density of carbonate rock fractures. Background technique [0002] The development of carbonate reservoirs has strong heterogeneity, and the development degree and opening of fractures play a vital role in the storage and permeability performance, hydrocarbon migration and accumulation, and production capacity construction of carbonate reservoirs. . Since the carbonate reservoirs in my country generally have low porosity and low permeability, fractures play a more prominent role in improving reservoir properties and improving the availability of oil and gas. [0003] In the exploration geophysical technical methods of fracture detection, there are mainly two types of petroleum geophysical logging (referred to as logging) technical methods and petroleum geophysical seismic exploration (referred to...

AI Technical Summary

Problems solved by technology

However, this kind of method must use 3D wide-azimuth seismic exploration data or multi-wave seismic exploration data, which often leads to a significant increase in exploration costs, so they are not widely used at present.

Images