Random modeling method for hyperspectral alteration information of drilling core in three-dimensional space

Abstract

The invention belongs to the technical field of earth science, and particularly relates to a random modeling method for hyperspectral alteration information of a drilling core in a three-dimensional space. The method comprises the following steps: step 1, performing hyperspectral measurement on a drilled core to obtain hyperspectral data of the drilled core; step 2, processing hyperspectral data of the drilled rock core; step 3, carrying out quantitative calculation of alteration information; step 4, carrying out counting and logging; step 5, constructing an alteration information space attribute library; step 6, constructing a three-dimensional grid; step 7, carrying out variation function analysis; step 8, carrying out sequential Gaussian simulation; and step 9, carrying out random modelanalysis, optimization and verification. According to the invention, the depiction of the alteration by the hyperspectral information of the drilling core is very fine; a more real three-dimensionalmodel of the alteration information can be established by comparing and analyzing the differences of a plurality of random models through the idea of random simulation, so that the reliability of three-dimensional modeling of the deep alteration information is improved, and a new technical support is provided for deep prospecting prediction.

Description

technical field [0001] The invention belongs to the technical field of earth science, and in particular relates to a stochastic modeling method for hyperspectral alteration information of borehole cores in three-dimensional space. Background technique [0002] Drilling core hyperspectral measurement is a new technology to study core material composition based on spectral characteristics, and it is the development direction of hyperspectral remote sensing for deep geological applications. Since the bands covered by hyperspectral data include not only visible light, but also various infrared spectrum bands in the near, middle and far range, it can identify different types of information that are much richer than the human eye. unique advantage. 3D modeling of alteration information is an important part of 3D geological modeling of deposits. By performing 3D geological modeling and visualization of alteration information, it can help geologists to display the spatial distribut...

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Problems solved by technology

[0004] From the perspective of modeling objects and methods, deep alteration information, especially hydrothermal alteration, is heterogeneous and uncertain. When the number of boreholes is limited and unevenly distributed, traditional deterministic modeling methods For example, the distance inverse power method has obvious limitations

Although the kriging method can reflect the spatial structure of variables and obtain estimation accuracy, it is still a local estimation method and does not take into account the overall spatial correlation of estimated values.

The kriging method can guarantee the local optimum of the data, but not the overall optimum, because the variance of the kriging estimate is smaller than the variance of the original data

Therefore, large estimation errors may occur when there are few well points and the distribution is uneven, especially in the non-well area outside the well points.

Moreover, Kriging is a smooth interpolation method, which smoothes the real observation data to reduce the estimated variance. Although a smooth and beautiful mapping effect can be obtained, some meaningful anomalies may be filtered out, and these anomalies may happen to be is a key element related to ore prospecting

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