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Two-dimensional numerical simulation method and system of hydrate stability bottom boundary of salt diapirism structure belt

A two-dimensional numerical and simulation method technology, applied in the field of natural gas hydrate exploration, can solve problems such as BSR upward migration

Active Publication Date: 2018-10-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

In addition, the increase of pore water salinity will inhibit the formation of hydrate, so that the hydrate phase equilibrium curve will shift to the left, and it will also cause the upward shift of BSR.

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  • Two-dimensional numerical simulation method and system of hydrate stability bottom boundary of salt diapirism structure belt
  • Two-dimensional numerical simulation method and system of hydrate stability bottom boundary of salt diapirism structure belt
  • Two-dimensional numerical simulation method and system of hydrate stability bottom boundary of salt diapirism structure belt

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[0070] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0071] The present invention comprehensively considers the influence of geothermal gradient, different thermal conductivity of salt and sediment, and high salinity anomaly of salt bottom split structure belt on the stable bottom boundary of hydrate (shown as BSR on seismic data), and reflects it in Numerical simulation of BSR under hydrate phase equilibrium conditions. The high degree of fitting between the simulated BSR and the observed BSR means that the selected parameters such as geothermal gradient, thermal conductivity, and salinity are more realistic. After confirming that the simulation method is feasible, the simu...

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Abstract

The invention belongs to the technical field of natural gas hydrate exploration, and discloses a two-dimensional numerical simulation method and system of a hydrate stability bottom boundary of a saltdiapirism structure belt. Influences of geothermal gradients, different thermal conductivity of salt and sediment and high salinity abnormalities of the salt diapirism structure belt on the hydrate stability bottom boundary (shown as BSR on seismic data) are analyzed, and are reflected in a hydrate phase equilibrium condition for numerical simulation on the BSR. The system includes a BSR featureselection module, a double-pass travel time determination module, a phase equilibrium stability curve selection module of natural gas hydrate, a pressure value determination module of BSR developmentdepth, a depth value calculation module of the BSR, a temperature value determination module of all points of a seabed on a seismic section, a temperature field distribution calculation module of theseismic section, a hydrate stability bottom boundary moving module and a comparing and analysis module. The method and the system can be used for any salt diapirism structure belt with obvious boundaries to predict a position of a hydrate stability bottom boundary thereof.

Description

technical field [0001] The invention belongs to the technical field of natural gas hydrate exploration, and in particular relates to a two-dimensional numerical simulation method and system for the stable bottom boundary of hydrate in a salt bottom split structural zone. Specifically, it relates to a method for describing and predicting the stable bottom boundary of hydrate in the salt split structural zone by using seismic interpretation and numerical simulation methods. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] The bottom boundary of the gas hydrate stability zone in the sea area (BHSZ: Base of Gas hydrate stability zone) generally appears as a bottom simulating reflection (BSR) in seismic data, representing the hydrate-bearing formation and the bottom free gas-bearing formation. The phase boundary between them is an important seismic reflection sign of gas hydrate. It is generally consider...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 杨金秀卢双舫王民薛海涛肖佃师
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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