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Reservoir feature inversion method based on seismic scattered wave field analysis

A seismic scattering and wave field technology, applied in the field of petroleum geophysical exploration, can solve the problems of difficult to achieve accurate inversion, difficult attribute structure of complex geological bodies, etc.

Active Publication Date: 2021-11-02
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, the above studies are all approximate equations derived under the constraints of a series of idealized assumptions, without combining the actual seismic signal information, and it is very difficult to invert the actual attribute structure of complex geological bodies only from the approximate equations. So that it is difficult to realize the accurate inversion of the rock physical parameters of the actual geological medium and the parameters of oil and gas reservoirs

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  • Reservoir feature inversion method based on seismic scattered wave field analysis
  • Reservoir feature inversion method based on seismic scattered wave field analysis
  • Reservoir feature inversion method based on seismic scattered wave field analysis

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Embodiment 1

[0042] Example 1: A certain research area is an anisotropic geological reservoir. At this time, we can build an isotropic forward modeling model to obtain simulated seismic signals corresponding to isotropic media, and obtain actual seismic observation data and benchmark rock physical models. The difference of seismic response data is used to obtain the corresponding seismic scattering wave field, and the anisotropy of the anisotropic geological reservoir can be well analyzed according to the difference of the obtained seismic scattering wave.

Embodiment 2

[0043] Embodiment 2: Taking the difference in seismic scattering wavefields of gas wells, water wells, and gas-water wells in a reservoir of a Leikou section formation in the Sichuan Basin as an example. At this time, we can construct corresponding seismic forward modeling models according to the differences of gas wells, water wells, and gas-water wells, and obtain corresponding model seismic response signals. On this basis, the differences between the actual seismic signals and the model seismic response signals of gas wells, water wells, and gas-water wells are calculated to obtain the corresponding seismic scattering wavefields. According to the seismic scattering wave field changes corresponding to gas wells, water wells, and gas-water wells, the inversion of the petrophysical parameters of the actual geological medium and the parameters of oil and gas reservoirs is realized.

[0044] The present invention is described in detail by taking Embodiment 2 as an example. This ...

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Abstract

The invention discloses a reservoir feature inversion method based on seismic scattered wave field analysis, and belongs to the field of oil-gas exploration and development. The method comprises the following steps: constructing a reference rock physical model according to well data or prior geological knowledge, calculating the seismic response of the reference rock physical model by using a seismic forward modeling method, solving the difference between actual seismic observation data and seismic response data of the reference rock physical model, namely, the difference as a seismic scattering wave field. By analyzing the scattered wave field, the difference of the actual geological medium relative to the reference rock physical model can be obtained. Different reference rock physical models can be constructed by adjusting parameters such as the longitudinal wave speed, the transverse wave speed, the density, the porosity, permeability and saturation parameters and the anisotropy parameters, and then scattered fields of different actual observation data relative to the reference rock physical models can be obtained. By analyzing the relationship between model parameter adjustment and scattered field quantity change, the inversion of actual geological medium rock physical parameters and oil and gas reservoir parameters can be realized.

Description

technical field [0001] The invention relates to the field of petroleum geophysical exploration, in particular to a reservoir feature inversion method based on seismic scattering wave field analysis. First, a benchmark rock physics model is constructed based on well data or prior geological knowledge, and the seismic response of the benchmark rock physics model is calculated using the seismic forward modeling method, and the scattering field of different actual observation data relative to the benchmark rock physics model is obtained. The analysis of the relationship between the parameter adjustment and the change of the scattering field quantity realizes the inversion of the petrophysical parameters of the actual geological medium and the parameters of the oil and gas reservoir. Background technique [0002] Seismic data has always played a vital role as a medium for subsurface geological conditions. Rock physics is a bridge connecting reservoir characteristics and paramete...

Claims

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Application Information

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IPC IPC(8): G01V1/40G01V1/30
CPCG01V1/40G01V1/306G01V2210/624Y02A10/40
Inventor 曹俊兴蒋旭东王俊
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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