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3D electromagnetic fast inversion method of minimized target

A three-dimensional electromagnetic technology with the smallest target, which is applied in the field of magnetotelluric exploration data processing and can solve problems such as underutilization

Active Publication Date: 2007-07-25
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as well logging data and shallow seismic data have not been fully utilized

Method used

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  • 3D electromagnetic fast inversion method of minimized target
  • 3D electromagnetic fast inversion method of minimized target
  • 3D electromagnetic fast inversion method of minimized target

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0032] The first step of the present invention is to determine the known area according to the known data such as earthquakes and drilling, and to determine the conductivity parameters of the non-research area according to the known data at the same time, and to establish a three-dimensional background conductivity parameter combination through three-dimensional interpolation; for the three-dimensional background conductivity The parameter combination adopts the integral equation method to calculate the background field, and the entire inversion process only needs to be calculated once; determine the unknown area of ​​the three-dimensional inversion according to the actual production requirements, and establish the initial conductivity parameter combination of the research target; use the integral equation for the initial conductivity parameter combination The anomalo...

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Abstract

A 3-D electromagnetic fast inversing method of object minimization includes confirming known object region according to known geologic data, setting up background conductivity combination according to known conductivity parameter and 3-D interpolation, calculating background field of said combination, inversing unknown region as per requirement of production, obtaining general field, carrying out 3-D interpolation on phase curve and actually measured conductivity curve, inversing frequency and fitting inversed frequency to obtain underground conductivity set of object.

Description

technical field [0001] The invention relates to a data processing technology for magnetotelluric prospecting in geophysical prospecting, and is a three-dimensional electromagnetic rapid inversion method with target minimization. Background technique [0002] Magnetotellurics is a method of geophysical exploration. Generally, changes in the conductivity of underground media are known by observing changes in the electromagnetic field on the ground. In the 1990s, a new electromagnetic prospecting method was developed from the magnetotelluric prospecting method (abbreviated as MT), called the continuous electromagnetic array profiling method (abbreviated as CEMP), which developed from the simple magnetotelluric single-point acquisition method to Array multi-channel acquisition method along the survey line; at the same time, due to the rapid development of computer technology, the two-dimensional finite element method and the two-dimensional continuum inversion method have mature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38G01V3/08G01V3/26
Inventor 王永涛何展翔
Owner BC P INC CHINA NAT PETROLEUM CORP
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