Quantitative prediction method for slope break belt by utilizing seismic data

Abstract

The invention relates to a quantitative prediction method for a slope break belt by utilizing seismic data. The method comprises A according to the background data, such as geology and earthquake, performing fine three dimensional seismic horizon explanation for the series of strata of the developed slope break belt, and obtaining the horizon data of the target horizon; B solving the gradient and the exposure value of the target horizon; C according to the gradient and the distribution characteristic on an exposure planar graph, preliminarily identifying the distribution range of the slope break belt; if the boundary of the slope break belt is clear, directly solving the geometrical parameters of the slope break belt: rupture, slope toe, gradient, altitude difference and horizontal width; if the boundary of the slope break belt is fuzzy (such as influence of breakage), performing the step D; D counting and solving the mean value theta for all the exposure values in the preliminarily identified slope break belt range; E taking the theta as the center and Delta as the step length, scanning and solving the optimal apparent gradient Phi in the theta+-Epsilon range; and F according to the solved optimal apparent gradient in the step E, identifying the boundary of the slope break belt, and respectively solving the geometrical parameters of the slope break belt. The quantitative prediction method for a slope break belt by utilizing seismic data can realize plane depiction of the gradient of the slope break belt, and can improve the accuracy for gradient calculation.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method for quantitatively predicting slope break zones using seismic data. Background technique [0002] Slope breaks were originally a geomorphological concept, referring to areas with sudden changes in terrain slopes, and slope breaks may develop in both sedimentary basins and denudation areas. The slope break belt is mainly composed of the following parts: slope break (slopebreak): refers to the line connecting the turning points where the terrain changes from gradual to steep, and is an upward convex ridge; Zone; slope toe (slopetoe): refers to the line connecting the turning points from steep to gentle, which is a concave groove. Based on the study of synsedimentary structural slope breaks in half-graben basins, Lin Changsong et al. considered that the structural slope breaks in faulted lacustrine basins restrict the change of the basin’s accommodating space...

AI Technical Summary

Problems solved by technology

However, there are two shortcomings of the existing methods. The first is that the division of slope breaks is mostly done manually. There are many factors affecting the division scheme, and it is a qualitative understanding of slope breaks. The identification of slope breaks and slope toes Inaccurate; the second is that it cannot describe the plane changes inside the slope break belt and its up and down slopes

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