Seismic response simulation method for heterogeneous hydrate reservoir

A technology of seismic response and simulation method, applied in the field of natural gas hydrate seismic exploration

Inactive Publication Date: 2021-01-22
JILIN UNIV
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  • Summary
  • Abstract
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Problems solved by technology

[0004] However, there is no geological and geophysical model based on the petrophysical model to establish the non-uniform change of hydration saturation with the formation depth, and to realize the seamless connectio...

Method used

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  • Seismic response simulation method for heterogeneous hydrate reservoir
  • Seismic response simulation method for heterogeneous hydrate reservoir
  • Seismic response simulation method for heterogeneous hydrate reservoir

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Embodiment 1

[0077] Such as figure 1 As shown, in order to achieve the above object, the present invention provides a method for simulating the seismic response of a heterogeneous hydrate reservoir, comprising the following steps:

[0078] A. For hydrate reservoirs, free gas formations and water-bearing formations, obtain the content, elastic modulus and density of various types of mineral components in the matrix skeleton, the elastic modulus and density of hydrates, and the elastic modulus and density of formation water , the reservoir porosity;

[0079] B. Establish a non-uniform model for the vertical variation of hydrate formation saturation and the lateral variation of formation thickness, and then use the BISQ model (1993) with given input parameters to obtain the variation law of the velocity and attenuation of the gas hydrate-bearing sandstone formation with frequency ;

[0080] C. Using the White patchy saturation model (1975) to calculate the velocity dispersion characteristic...

Embodiment 2

[0138] Explained by a set of data:

[0139] A. For hydrate reservoirs, free gas formations and water-bearing formations, obtain the content, elastic modulus and density of various types of mineral components in the matrix skeleton, the elastic modulus and density of hydrates, and the elastic modulus and density of formation water , the reservoir porosity;

[0140] B. Establish a non-uniform model for the vertical variation of hydrate formation saturation and the lateral variation of formation thickness, and then use the BISQ model (1993) with given input parameters to obtain the variation law of the velocity and attenuation of the gas hydrate-bearing sandstone formation with frequency ;

[0141] Among them, the velocity and attenuation of gas hydrate-bearing sandstone formations with frequency are calculated according to the BISQ model (1993), and the compressional wave velocity, attenuation coefficient and inverse quality factor are expressed as:

[0142] in,

[0143] ...

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Abstract

The invention relates to a seismic response simulation method for a heterogeneous hydrate reservoir. The method comprises the steps that the content, elasticity modulus and density of various mineralcomponents in a matrix framework, the elasticity modulus and density of hydrate, the elasticity modulus and density of formation water and reservoir porosity are obtained; establishing a non-uniform model of vertical change of hydrate stratum saturation and transverse change of stratum thickness, and obtaining a change rule of speed and attenuation of the sandstone stratum containing the natural gas hydrate along with frequency by utilizing the BISQ model; calculating the velocity dispersion characteristics of the underlying free gas stratum of the hydrate-containing stratum by using a White spotted saturation model; and based on a propagation matrix theory, calculating reflection waveforms of the heterogeneous hydrate stratum and the free gas stratum. The method comprises the following steps: establishing a non-uniform model of hydrate stratum saturation vertical change and stratum thickness transverse change; and calculating the seismic reflection waveform response of the non-uniformhydrate stratum through a rock physical model and a seismic simulation method based on a propagation matrix theory.

Description

technical field [0001] The invention belongs to the technical field of natural gas hydrate seismic exploration, in particular to a simulation method for seismic reflection waveform response of natural gas hydrate reservoirs, in particular to a seismic response simulation method for heterogeneous hydrate reservoirs. Background technique [0002] The seismic waveform identification feature of gas hydrate formations is Bottom Simulating Reflector (BSR, Bottom Simulating Reflector), which usually appears in slopes and seabed sedimentary strata in marine environments. However, not all occurrences of BSR correspond to gas hydrate reservoirs. Therefore, it is of great significance to establish a geological and geophysical model of gas hydrate on the basis of the rock physical model, and to use seismic reflection theory and numerical simulation technology to study the seismic reflection waveform response of gas hydrate formations. [0003] Based on the weight equation, Zhang et al....

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 王雪莹郭智奇
Owner JILIN UNIV
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