Method for determining carbonate rock hydrocarbon reservoir structure

Abstract

The invention relates to a seismic prospecting technology which is a method of determining a carbonate reservoir structure. The concrete steps are as follows: wave field reconstruction parameters are obtained by using a field observation system; type parameters corresponding to an underground geological structure are obtained by processing data, a discrete strata property model is established; wave field values on various discrete mesh points at each moment are reconstructed, and wave fields of the positions where a detection point is positioned at each moment are taken as a wave field reconstruction record; and sections obtained by the wave field reconstruction are compared with stacked and migrated sections obtained by processing the field acquisition data to determine the distribution, and the fracture development direction and the development degree of an underground carbonate reservoir. The technology is applicable to the wave field reconstruction of any completed structure, has the ability of determining underground oil-gas reservoir structures, and has the characteristics of high accuracy, high efficiency, low frequency dispersion and improving the calculation efficiency.

Description

technical field [0001] The present invention relates to seismic exploration technology, specifically the anisotropic elastic wave field reconstruction of carbonate rock oil and gas reservoirs realized under staggered grids with high precision, high efficiency and low frequency dispersion. Methods of oil and gas reservoir construction. Background technique [0002] In reflected wave seismic exploration, we excite seismic waves on the ground and use geophones to receive reflection information from underground geological bodies—seismic records. For the obtained reflection information, through a series of seismic data processing and interpretation, various attributes of the depth domain are obtained, so as to determine the reservoir distribution. According to the obtained formation attribute parameters, simulate the field seismic data acquisition process to reconstruct the reflection information of the geological body (this process of reconstructing the reflection information o...

AI Technical Summary

Problems solved by technology

[0033] The above second-order partial differential equations represented by displacements contain four mixed spatial derivative terms. When solving the difference, the central difference is required, and the accuracy is low.

Moreover, as the expansion order of the partial derivative increases, the amount of calculation increases in a quadratic relationship with the expansion order, which greatly increases the calculation cost and makes the wave field reconstruction period longer.

The root cause of the problems in the existing technology is that the selected displacement equation is not suitable for the propagation characteristics of seismic waves in carbonate rocks, let alone accurately determine the structure of carbonate rock reservoirs

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