Method and device for establishing relationship template between mineral composition of salt gypsum rock and rock velocity

Abstract

The invention relates to a method and apparatus for establishing a salt gypsum rock mineral composition and rock velocity relationship template. The method includes the following steps that: the matrix velocities of salt gypsum rock mineral compositions of a single well are obtained, wherein the salt gypsum rock mineral compositions include gypsum, salt, mud and holes; the salt gypsum rock mineral compositions of each stratum section of the single well are obtained; under a condition that porosity content is determined, when the content of mud changes, the content of corresponding gypsum and salt also changes; and corresponding rock velocities are obtained according to the matrix velocities of the salt gypsum rock mineral compositions, the porosity content, the mud content, the gypsum content and the salt content; rock velocities in salt gypsum rock which are corresponding to different porosity content are set in the same coordinate system, so that the salt gypsum rock mineral composition and rock velocity relationship template can be constructed; and the abscissa of the salt gypsum rock mineral composition and rock velocity relationship template indicates the content of the gypsum or the salt in the salt gypsum rock mineral compositions, and the ordinate of the salt gypsum rock mineral composition and rock speed relationship template indicates rock velocity.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to a method and a device for establishing a template for the relationship between mineral composition and rock velocity of salt-gypsum rock. Background technique [0002] Petroleum-bearing basins such as Kuqa Depression and Jianghan Basin in China are all salt-bearing basins. In the seismic exploration of saline basins, an important problem is how to obtain accurate imaging of the structure of saline basins. The core of this problem is to obtain accurate velocity of salt-gypsum rocks. Due to the existence of the abnormal velocity layer of salt-gypsum rock, it has a strong absorption and attenuation effect on the seismic wave energy, resulting in weak reflection energy of the target layer, and the trap of "false structure" in the seismic time section. Therefore, it is important to study the velocity of salt-gypsum rock. significance. At present, the main method to s...

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Problems solved by technology

[0003] In the relationship between rock velocity and mineral component content, it is generally aimed at sandy-shale formations, and the influence of shale content and porosity on rock velocity is measured in the laboratory, and the mineral component content of salt-gypsum rock has little effect on the velocity of salt-gypsum rock. Impact

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