An industrialized process for identification of dominant seepage channels in clastic oil and gas reservoirs

Abstract

The present invention is an industrial process for identification of dominant seepage channels in clastic rock oil and gas reservoirs, comprising the following steps: 1) Divide n development stages, and divide wells into n groups according to the development stages of the drilling time; 2) Divide the data of the research area Grid; 3) Interpolate the permeability parameters of the well points in well group 1 to obtain the permeability plane distribution grid of development stage 1; 4) use the method of step 3) to sequentially obtain the permeability plane distribution grid R1 of n development stages , R2,...Rn; 5) Use the results of step 4 to calculate the coefficient of variation of the permeability value of each grid point as the development stage changes, and obtain the grid P of the coefficient of variation; 6) Subtract R1 from Rn, and the difference is positive Assign the value 1 to the grid point, assign ‑1 to the negative grid point, and get the grid T; 7) multiply the grid P and T to get the grid Q, draw the Q contour map, and the contour map is greater than 0.3 The region is the dominant seepage channel. The invention can guide oil field water injection development and residual oil prediction.

Description

technical field [0001] The invention relates to the field of petroleum development geology, and is an industrial process for identifying dominant seepage channels in clastic rock oil and gas reservoirs. Background technique [0002] In the process of oil and gas water injection development, the high porosity and high permeability (or ultra-high permeability) zone formed by long-term water flooding in the reservoir is called the dominant seepage channel. When the reservoir enters the high (ultra-high) water cut period, the role of the dominant seepage channel in the reservoir will appear, especially in the reservoir with high permeability, this phenomenon is more obvious. Due to the heterogeneity of the reservoir plane and the difference in development conditions, the development of the dominant seepage channels in the reservoirs in different areas in the ultra-high water-cut period is very different, and the dominant seepage channels at different levels have different geolog...

AI Technical Summary

Problems solved by technology

[0007] Although domestic and foreign scholars and oil companies have carried out a lot of research and field tests on the dominant seepage channels of reservoirs, and summarized a series of identification methods, due to the heterogeneity of reservoirs and the uniqueness of different reservoir geology and development processes, At present, there is still a lack of simple, universal and practical methods and technical processes