River channel sand body fine-identification method

Abstract

The invention relates to a river channel sand body fine-identification method comprising the following steps: determining seismic response characteristics corresponding to different sand body sedimentation modes in order to identify the characteristics of a river channel; determining the phase relationship of sand layers on the time section through de-sanding test, and identifying the envelope surface of the sand body of the river channel based on the seismic response characteristics of the river channel; cutting stratum slices at equal time intervals from top to bottom to obtain the superimposed relationship of the river channel in different periods; making clustering analysis of five basic attributes and other unconventional attributes and determining the boundary of the sand body of the river channel; and carrying out fine stratigraphic correlation to determine the superimposed relationship of the internal space of the sand body, accurately working out the oil-bearing area and reserves of a single sand body, and determining the scope of development well network deployment. Through the process, technical problems, for example, reservoir plane distribution in a multi-source convergence area is complex, sand bodies are of high heterogeneity, and the resolution of seismic data does not meet the requirement of a predicted thin reservoir, are solved, the success rate of drilling is greatly improved, and the method has a broad market prospect.

Description

technical field [0001] The invention relates to a method for finely identifying channel sand bodies, which belongs to the technical field of petroleum exploration and development. Background technique [0002] In continental basins where channels are widely distributed, accurate prediction of channel sandbody boundaries is very important. In the "double high" oil region with high maturity and high resource proven rate in the east, the detailed description of channel sand bodies can not only find the distribution area of ​​hidden remaining oil, but also lay a solid foundation for the deployment of development well pattern and the acquisition of actual production. [0003] In recent years, the prediction methods of channel sand bodies have become more and more diversified. The discussion is purely from the aspects of seismic identification and slice analysis, but when the channel sand bodies are vertically superimposed and continuous, the lateral changes are fast, and the thi...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a fine identification method for channel sand bodies, so as to solve the problem of complex plane distribution of reservoirs in multi-provenance intersection areas, strong heterogeneity of sand bodies, and seismic data resolution that cannot meet the requirements of predicting thin reservoirs and other technical issues

Images