Initial value filling method and device of gravity-magnetic-electric-seismic joint inversion common grid cells

Abstract

The invention provides an initial value filling method and device for gravity-magnetic-electric-seismic joint inversion common grid cells, and relates to the technical field of comprehensive geophysical exploration. The method comprises the steps of firstly, obtaining logging data when a drilling well is in a measurement region, and obtaining target logging data; secondly, acquiring seismic data of the measurement region, and further performing inversion to obtain seismic attribute data; then, establishing an initial value estimation incidence relation model; then, establishing an initial inversion stratigraphic framework model based on a structure interpretation result of the seismic data, and performing consistency gridding processing on the initial inversion stratigraphic framework model and the gravity magnetoelectric observation data to obtain a common grid unit; and finally, based on the initial value estimation incidence relation model, converting the seismic attribute data in the common grid cells into initial values of various geophysical methods, and filling the common grid cells with the initial values to complete construction of an initial inversion model. The method can achieve the quick, high-precision and automatic filling of the initial values.

Description

technical field [0001] The invention relates to the technical field of comprehensive geophysical exploration, in particular to a method and device for filling an initial value of a common grid unit in joint inversion of gravity, magnetism, electric and seismic. Background technique [0002] At present, the modeling method dominated by gravity, magnetic, electric and seismic joint inversion is still based on the early traditional theoretical modeling method, which not only needs to solve complex ultra-large-scale nonlinear equations, but also needs to make many assumptions, for example: the The original nonlinear model is simplified to a linear model, which greatly restricts the accuracy of joint inversion and the speed of iterative solution, especially in the case of insufficient or lacking prior knowledge (drilling and logging data) and model parameters (physical property test data) However, it is difficult for these inversion methods to adapt to complex and variable deep g...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for filling the initial value of the common grid unit in joint gravity, magnetic, electric and seismic inversion, so as to alleviate the artificial value assignment, low precision, poor correlation and low time consumption in the prior art effective technical issues

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