Method and system for comparing lateral accretion sand body of meandering river

Abstract

The invention provides a method and a system for comparing the lateral accretion sand body of a meandering river. The method for comparing the lateral accretion sand body of the meandering river comprises the following steps: establishing a well-connected comparison grid diagram for multiple wells according to well spacing; according to the gamma values of different positions of each well, markingthe development position of the flooding mudstone in each well, the development position of the side-accumulated mudstone and the development position of the mud plug in the well-connected comparisongrid diagram; adopting the development position of the flooding mudstone in one of the wells as a sign layer for layer leveling; recognizing the development position of the mud plug to obtain the tendency of the lateral accretion mudstone; calculating the inclination angle of the lateral accretion mudstone; on the basis of the development position of the lateral accretion mudstone; the inclination of the lateral accretion mudstone and the inclination angle of the lateral accretion mudstone, drawing a plurality of lateral accretion sand body segmentation curves of the meandering river in the well-connected comparison grid diagram so as to obtain a comparison cross-sectional view of the lateral accretion sand body of the meandering river. In this way, the internal separation interlayer distribution rule and the sand body overlapping relation of the lateral accretion sand body can be accurately depicted, so that the reserve utilization rate and the residual oil prediction precision are further improved.

Description

technical field [0001] The invention relates to the technical field of geological research, in particular to a method and system for comparing lateral accretion sand bodies of meandering rivers. Background technique [0002] As most oilfields in my country have entered the high water-cut development stage, the contradiction between injection and production has become increasingly prominent, and fine sand body correlation has become an important means to tap the remaining reserves and improve the production rate of reserves. [0003] The current sandbody correlation method based on lithological similarity cannot truly reflect the distribution of internal interlayers and the superposition relationship of sandbodies in lateral accretion sandbodies, and cannot meet the current requirements for fine exploration and development, resulting in the production rate of reserves and the remaining Oil prediction accuracy is low. Contents of the invention [0004] The main purpose of t...

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Problems solved by technology

[0003] The current sandbody correlation method based on lithological similarity cannot truly reflect the distribution of internal interlayers and the superposition relationship of sandbodies in lateral accretion sandbodies, and cannot meet the current requirements for fine exploration and development, resulting in the production rate of reserves and the remaining Oil forecasting accuracy is low

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