Quantitative prediction method for slope break belt by utilizing seismic data

A technology of seismic data and slope breaks, applied in the field of petroleum exploration, can solve the problems of inability to describe the plane changes of slope breaks, many factors affecting the division scheme, and inaccurate identification of slope breaks and slope toe, so as to improve identification and parameter description Accuracy, reduction of breakage, and effect of improving calculation accuracy

Inactive Publication Date: 2016-05-11
SOUTHWEST PETROLEUM UNIV
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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 qualitat

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  • Quantitative prediction method for slope break belt by utilizing seismic data
  • Quantitative prediction method for slope break belt by utilizing seismic data
  • Quantitative prediction method for slope break belt by utilizing seismic data

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Embodiment Construction

[0027] A method for quantitatively predicting slope breaks using seismic data of the present invention comprises the following steps: A. According to the background data such as target geology and earthquakes, fine three-dimensional seismic horizon interpretation is carried out to the layer series developing slope breaks to obtain the target layer Horizontal data; B. Calculate the slope and aspect of the target layer according to the finely interpreted seismic horizon data and the slope calculation model; C. Preliminarily identify the distribution range of the slope break according to the distribution characteristics of the slope and aspect on the plane map; if If the boundary of the slope break is clear, then directly obtain the geometric parameters of the slope break: slope break, slope toe, slope, height difference, and horizontal width; And calculate the average value θ of all aspect values ​​within the initially identified slope break range; E, take θ as the center, and δ ...

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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...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306
Inventor 周路袁兵吴勇周洁玲
Owner SOUTHWEST PETROLEUM UNIV
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