Single-stage underwater distributary channel identification method

Abstract

The invention relates to a single-stage underwater distributary channel identification method. The identification method includes the following steps: 1) in a braided river delta, classifying stages of drilling sand bodies of each well according to the thickness from a target bed to a marker bed; 2) studying sedimentary microfacies of sand bodies of the same stage, and analyzing distribution directions of underwater distributary channels; 3) in the distribution directions of the underwater distributary channels, classifying all underwater distributary channels according to contact relations ofunderwater distributary channels of adjacent wells; and 4) determining a distribution range of all distributary channels of underwater distributary channels of a single stage according to seismic properties and boundaries of seismic inversion in predicting sand body distribution. The single-stage underwater distributary channel identification method provided by the invention can determine a distribution range of all distributary channels of underwater distributary channels of a single stage, and more clearly display spatial variations of lithology and lithofacies of a front belt of a braidedriver delta so as to further provide technical support for the exploration and exploitation of complex lithologic reservoirs.

Description

technical field [0001] The invention belongs to the field of petroleum exploration and development, and in particular relates to an identification method of a single-stage underwater distributary channel. Background technique [0002] With the increasing degree of oil and gas exploration, the geological objects for exploration and development are getting smaller and more subtle, mainly small and thin sand bodies, these sand bodies belong to different branch channels due to their multiple development stages , the heterogeneity of the sand body plane is strong, which makes it difficult to deploy wells and seriously restricts the exploration and development process of oil and gas reservoirs. [0003] At present, many attempts have been made to identify single-stage underwater distributary channel sand bodies in terms of its formation mechanism, exploration and development methods, etc., but due to the complexity of single-stage underwater distributary channel sand bodies, no si...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a single-stage underwater distributary channel identification method to solve the problem that the existing methods cannot clearly show the spatial variation of each branch channel of the underwater distributary channel

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