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Undulating tunnel space forward simulation system and method based on irregular fan-shaped mesh subdivision

A technology of grid division and forward modeling, applied in the field of petroleum exploration, can solve the problems of inaccurate simulation of seismic wave field and so on

Active Publication Date: 2019-01-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In special geological environments such as tunnels, well logging, and boreholes, the traditional Cartesian coordinate elastic wave equation based on rectangular grids cannot accurately simulate the seismic wave field

Method used

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  • Undulating tunnel space forward simulation system and method based on irregular fan-shaped mesh subdivision
  • Undulating tunnel space forward simulation system and method based on irregular fan-shaped mesh subdivision
  • Undulating tunnel space forward simulation system and method based on irregular fan-shaped mesh subdivision

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Experimental program
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Effect test

Embodiment 1

[0069] A space forward modeling simulation system for undulating tunnels based on irregular fan-shaped grid division, its structure is as follows: Figure 10 As shown, it includes input module, grid generation module, coordinate transformation module, wave field continuation module, absorption boundary module, coordinate inverse transformation module and output module; the above modules are connected sequentially;

[0070] The input module is configured to input the spatial elevation function of the undulating tunnel, the geodetic coordinates of the seismic source and the geophone, and the compressional and shear wave velocity and density model of the tunnel space model;

[0071] a mesh generation module configured to perform irregular sector meshing for the undulating tunnel space model;

[0072] A coordinate transformation module configured to map the undulating tunnel space model to a rectangular grid subdivided model in a curved fan coordinate system;

[0073] The wave fi...

Embodiment 2

[0078] On the basis of the above-mentioned embodiments, the present invention also mentions a space forward simulation method for undulating tunnels based on irregular fan-shaped grid division, the process of which is as follows figure 1 As shown, it specifically includes the following steps:

[0079] Step 1: Input the spatial elevation function of the undulating tunnel, the geodetic coordinates of the source and receiver, and the velocity and density models of the longitudinal and shear waves of the tunnel space model.

[0080] Step 2: The space model of the undulating tunnel is divided into irregular sector grids.

[0081] Step 3: Map the space model of the undulating tunnel to the rectangular grid subdivision model in the curved fan coordinate system, and transform it through the coordinate transformation formula shown below:

[0082]

[0083] Among them, θ represents the angle variable in the polar coordinate system, r represents the radius variable in the polar coordi...

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Abstract

The invention discloses an undulating tunnel space forward simulation system and method based on irregular fan-shaped mesh subdivision, and belongs to the field of oil exploration. The undulating tunnel space forward simulation method comprises the following steps that the undulating tunnel space elevation function, geodetic coordinates of an earthquake focus and a detector, longitudinal and transverse wave speed and density of a tunnel space model are input; the undulating tunnel space model is subjected to irregular fan-shaped mesh subdivision and mapped to a model subjected to rectangular mesh subdivision under a curved fan coordinate system; a first-order speed-stress equation of elastic waves of the curved fan coordinate system is deduced; wave field updating is conducted through a fully-staggered mesh mechanism under the curved fan coordinate system; artificial boundary reflection is absorbed through three-direction absorbing boundary conditions under the curved fan coordinate system; and snapshots of a wave field are converted to the positions under a Cartesian coordinate system, and shot records and snapshots of the wave field of the undulating tunnel space model are output. According to the undulating tunnel space forward simulation system and method, earthquake wave field propagation under certain special geological environments such as tunnels and logging and drilling spaces can be simulated more accurately.

Description

technical field [0001] The invention belongs to the field of petroleum exploration, and in particular relates to a space forward simulation system and method for undulating tunnels based on irregular sector grid division Background technique [0002] Petroleum is an important strategic resource to ensure national security. With the rapid increase in the dependence of my country's oil supply and demand on foreign countries year by year, it is urgent to strengthen theoretical research on seismic exploration to increase my country's oil and gas reserves and production. The complex underground structures and large differences in reservoir lithology in major oil and gas exploration areas in my country have brought great challenges to seismic exploration. The main difficulties are as follows: complex seismic wave propagation laws, weak seismic effective information, and difficulties in high-precision seismic imaging. In view of the complexity of geological structures in my country...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/282G01V2210/66G01V2210/67
Inventor 曲英铭李振春孙军治
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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