A Quantitative Grading Evaluation Method for Three-Dimensional Pore Throats in Tight Reservoirs

Abstract

A method for quantitatively grading pore throats in tight reservoirs in three-dimensional space provided by the present invention includes: 1) using avizo software to construct a digital core model and extract pore data and throat data; 2) according to the coordination number and the pore data, Pores are divided into effective pores and ineffective pores; 3) BOX-COX transforms the data of effective pores, ineffective pores and throats respectively; 4) Dimensionless processing is performed respectively; 5) Effective pores, ineffective pores and K-means clustering analysis was performed on the throat data, and the classification results were stored in database 1, database 2, and database 3 respectively; The pore throats inside the layer are subdivided. The method provided by the invention can improve the accuracy of classification evaluation, and accurately and quantitatively characterize the three-dimensional space pore-throat structure characteristics of tight sandstone reservoirs.

Description

technical field [0001] The invention belongs to the technical field of unconventional oil and gas exploration and development, and in particular relates to a method for quantitatively grading pore throats in three-dimensional space of tight reservoirs. Background technique [0002] In recent years, 3D digital core technology has gradually become the mainstream technology in the field of unconventional oil and gas analysis and testing. Digital core technology visualizes the pores and throats inside the core in three-dimensional space, analyzes the spatial characteristics of the shape and connectivity of the pores and throats, and can extract the parameters of pores and throats. For tight reservoirs, The pore-throat scale is mostly micro-nano-scale pores, which are distributed in large quantities in the reservoir, and the data sources in the space can reach thousands. How to realize the effective classification and evaluation of the quantitative data of the 3D digital core Th...

AI Technical Summary

Problems solved by technology

Digital core technology visualizes the pores and throats inside the core in three-dimensional space, analyzes the spatial characteristics of the shape and connectivity of the pores and throats, and can extract the parameters of pores and throats. For tight reservoirs, The pore-throat scale is mostly micro-nano-scale pores, which are distributed in a large number in the reservoir, and the data sources in the space can reach thousands. How to realize the effective classification and evaluation of the quantitative data of the 3D digital core rarely reported in the literature

Images