CN-122017983-A - Hydrate-containing stratum velocity and attenuation characteristic analysis and model construction method, device, equipment and storage medium

CN122017983ACN 122017983 ACN122017983 ACN 122017983ACN-122017983-A

Abstract

According to the method, the device, the equipment and the storage medium for analyzing the formation velocity and the attenuation characteristics of the hydrate and constructing the model, provided by the embodiment of the application, the influence of the hydrate on the elasticity parameters, the permeability and the fluid viscosity coefficient of a rock solid phase and a skeleton is particularly considered, the depicting precision of the model on an actual hydrate reservoir is improved, the association of a hydrate mineral component, a pore fluid and a microstructure with the macroscopic velocity and the attenuation attribute of an earthquake is established, the earthquake attributes of the hydrate reservoirs with different saturation, porosity, lithology and the like can be analyzed, the determination of the occurrence type has a certain guiding significance for estimating the hydrate saturation by utilizing the velocity and the attenuation attribute, the modeling method can be used for constructing various and practical hydrate models, can be used for researches such as seismic wave forward modeling and imaging of the hydrate reservoir, and a great amount of sample data are provided for artificial intelligent earthquake parameter inversion.

Inventors

NING YAXIN
WANG HONGQI
JIANG DAJIAN
XU KAI
LIU ZHIYUAN

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司石油勘探开发研究院

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (11)

1. A method of analyzing the velocity and attenuation characteristics of a multi-type hydrate-containing formation, comprising: S1, obtaining the elastic modulus of each mineral component of the rock; S2, calculating shear modulus and bulk modulus of rock solid phase and skeleton of different mineral components, different porosities, different hydrate saturation and occurrence types according to the result data of the step S1; and S3, calculating to obtain stratum speeds and quality factors of different lithologies, different porosities, different hydrate saturation and occurrence types according to the result data obtained in the step S2.
2. The method of analyzing the velocity and attenuation characteristics of a multi-type hydrate-containing formation according to claim 1, wherein the hydrate occurrence types include a particle contact mode, a suspension mode, and a cementing mode.
3. The method of analyzing the velocity and attenuation characteristics of a multi-type hydrate-containing formation according to claim 2, wherein, in step S2, In the particle contact mode, the solid phase elastic modulus K and G which do not contain the hydrate are corrected to obtain the solid phase elastic modulus of the stratum containing the hydrate, wherein the solid phase elastic modulus is as follows: where G h is the shear modulus of the pure hydrate and f h is the volume fraction of the hydrate, which can be calculated by the formula: The density of the solid phase also becomes ρ s '＝f h ρ h +(1-f h )ρ s due to the filling of the hydrate; In the cementing mode, the dry rock skeletal elastic moduli K dry and G dry were calculated according to the cementing theory of Dvorkin and Nur (1993 a): Wherein S n and S τ are values related to the cementing pressure and the hydrate content.
4. A method of multi-type hydrate-containing formation velocity and attenuation characterization according to claim 3, wherein in step S3, formation velocities and quality factors of different lithologies, different porosities and different hydrate saturation and occurrence types are obtained by correcting the permeability in the particle contact mode and the cementing mode and the bulk modulus and viscosity coefficient of the fluid in the suspension mode.
5. The method for constructing the multi-type hydrate-containing stratum adhesive medium model is characterized by comprising the following steps of: Firstly, randomly generating a relief stratum; A second step of calculating the formation velocity and quality factor of the undulating formation according to the multi-type hydrate-containing formation velocity and attenuation characteristics analysis method of any one of claims 1 to 4; step three, randomly generating a hydrate bottom interface, a top interface and a free gas layer bottom interface; Calculating the formation velocity and quality factor of the hydrate layer and the free gas layer according to the multi-type hydrate-containing formation velocity and attenuation characteristic analysis method of any one of claims 1 to 4; And fifthly, randomly generating a positive fault to obtain the viscous sound medium model.
6. The method of constructing a model of a multi-type hydrate-containing formation acoustic medium according to claim 5, wherein in the first step, the mesh size and sampling interval in the longitudinal and transverse directions of the model are set, then a plurality of formation interfaces are randomly generated by using sin (τχ χ i /n x /d x ) function, wherein τ is a random number, the fluctuation of the formation interfaces is controlled, x i is the horizontal coordinate position of the mesh points, n x is the number of horizontal mesh points, d x is the horizontal mesh interval, wherein the first layer is the subsea interface, and the depths of the remaining layers are randomly generated below the sea floor.
7. A multi-type hydrate-containing formation velocity and attenuation profile apparatus, comprising: The acquisition module is used for acquiring the elastic modulus of each mineral component of the rock; The modulus calculation module is used for calculating the shear modulus and the bulk modulus of the rock solid phase and the skeleton of different mineral components, different porosities, different hydrate saturation and occurrence types according to the result data obtained by the acquisition module; and the analysis module is used for calculating and obtaining stratum speeds and quality factors of different lithologies, different porosities, different hydrate saturation and occurrence types.
8. A multi-type hydrate-containing formation viscous acoustic medium model construction device, comprising: the generation module is used for randomly generating a relief stratum, and randomly generating a hydrate bottom interface, a top interface and a free gas layer bottom interface; A calculation module for calculating the formation velocity and quality factor of the undulating formation according to the multi-type hydrate-containing formation velocity and attenuation profile analysis method of any one of claims 1-4, and for calculating the formation velocity and quality factor of the hydrate layer and free gas layer according to the multi-type hydrate-containing formation velocity and attenuation profile analysis method of any one of claims 1-4; The model obtaining module is used for randomly generating a positive fault to obtain the viscous sound medium model.
9. An electronic device, comprising: A processor; a memory; And a computer program, wherein the computer program is stored in the memory, which computer program, when executed by the processor, implements the method of any of claims 1-4.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the method of any of claims 1-4.
11. A computer program product, characterized in that the computer program product comprises a computer program which, when executed by a processor, implements the method of any of claims 1-4.

Description

Hydrate-containing stratum velocity and attenuation characteristic analysis and model construction method, device, equipment and storage medium Technical Field The application relates to the technical field of unconventional reservoir rock physical modeling and seismic exploration, in particular to a method, a device, equipment and a storage medium for analyzing and constructing hydrate-containing stratum velocity and attenuation characteristics. Background The natural gas hydrate is the most potent unconventional clean alternative energy source after the conventional fossil fuel, most of the natural gas hydrate is distributed in marine sediments, and the natural gas hydrate has the characteristics of high efficiency, cleanliness and large reserves, so the natural gas hydrate has important strategic significance for the exploration and development technical research of the natural gas hydrate. Along with the further deep research of hydrate resources, higher requirements are also put forward on the positioning and reservoir description of the hydrate, a hydrate target area often develops in complex structures such as fracture, bottom split, mud volcanic and the like, the hydrate reservoir is thinner, the general thickness is only tens of meters to hundreds of meters, the hydrate reservoir has strong transverse discontinuity, the main identification mark is similar to the relationship of submarine reflection (BSR) and the hydrate and is not completely in one-to-one correspondence, the petrophysical and pore medium modeling method aiming at the hydrate reservoir is to analyze the seismic attribute of the hydrate-containing stratum, establish the effective identification mark of the hydrate and establish the basis of a hydrate model, and can provide important data support for the researches such as seismic response characteristics, seismic imaging, seismic attribute parameter inversion and the like of the hydrate-containing stratum. The hydrate-containing stratum has abnormal attenuation characteristics, the existing rock attenuation theory based on a pore medium mainly comprises three theories of Biot, BISQ and White, a plurality of scholars at home and abroad research on the attenuation characteristics of the hydrate based on the three theories, but the method still has a certain dispute, the unified and reasonable hydrate attenuation rock physical characterization and the method for constructing an acoustic medium model are lacked, the influence of the hydrate on rock solids, frameworks and the like is generally considered in the existing method, and a novel hydrate seismic attribute analysis method and a novel acoustic medium model construction method are needed to be researched. It should be noted that the information disclosed in the background section of the present application is only for enhancement of understanding of the general background of the present application and should not be taken as an admission or any form of suggestion that this information forms the prior art that is well known to a person skilled in the art. Disclosure of Invention In view of the above, the application provides a method, a device, equipment and a storage medium for analyzing and constructing hydrate formation velocity and attenuation characteristics, in particular to a method for analyzing petrophysical characterization and velocity and attenuation characteristics of a plurality of different hydrate occurrence types of formations in sea areas and a method for automatically constructing a viscous sound medium model in batches, which are beneficial to solving the problem that the prior art lacks unified and reasonable analysis of the seismic velocity and attenuation properties of the hydrate formations and automatic construction of model samples in batches. Aiming at a natural gas hydrate reservoir, a complete system multi-type hydrate seismic attribute analysis method and an automatic sticky medium model batch construction method are provided, the model is based on petrophysical and pore medium theory, the influences of different types of hydrates on a rock solid phase, fluid volume modulus, viscosity coefficient, permeability and the like are particularly considered, the depicting precision of an actual hydrate reservoir is improved, the relation between the elastic parameters and contents of each component of rock in a hydrate stratum and the seismic wave velocity and attenuation characteristics is established, and a foundation is laid for the identification, occurrence type judgment, saturation estimation, wave field characteristic analysis, imaging and artificial intelligence seismic parameter inversion research of the hydrate reservoir. In a first aspect, embodiments of the present application provide a method for analyzing the velocity and attenuation characteristics of a multi-type hydrate-containing formation, comprising the steps of: S1, obtaining the elastic modulus of each mineral component of the rock; S2, c