A deterministic method for qualitative identification of hydrate top-bottom interface at sea

A deterministic method and qualitative identification technology, applied in geophysical surveying, seismology, instruments, etc., to achieve the effect of reducing limitations and multi-solution interference, wide application range and high precision

Active Publication Date: 2019-02-19
西安恒泰艾普能源发展有限公司
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Problems solved by technology

These three methods can predict the distribution of hydrate to a certain extent, but each method has multiple solutions

Method used

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  • A deterministic method for qualitative identification of hydrate top-bottom interface at sea
  • A deterministic method for qualitative identification of hydrate top-bottom interface at sea

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Embodiment 1

[0035] In the present invention, the calculation method of weight coefficient in described step B comprises the following steps:

[0036] a. The relationship between sensitive attributes and gas hydrate characteristics is a nonlinear function; the contribution of sensitive attributes and hydrate geological characteristics is determined by the degree of agreement;

[0037] b. Calculate the non-linear weighting coefficient based on the degree of agreement between the sensitive attributes and the hydrate geological characteristics, and fuse the weighted information to obtain the attributes used to identify the hydrate characteristics.

[0038] In the present invention, the collaborative kriging algorithm in step C includes as follows:

[0039] a. According to the characteristics of the information, the information is classified, and the variables of the same nature or the variables of different natures are combined for spatial weighting calculation;

[0040] b. When a variable i...

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Abstract

The invention discloses a deterministic method for qualitatively identifying the top and bottom interfaces of hydrate in the sea, which includes the following steps: A, getting multiple sensitive attributes for identifying hydrate through seismic reflection characteristic research, AVO, elastic wave impedance inversion and other research methods; B, calculating the weight coefficients of the attributes by analyzing the relationship between the sensitive attributes and hydrate characteristics, and getting attributes used to identify the hydrate characteristics through information fusion analysis; C, studying the spatial correlation between the weighted attributes and sonic skew log variables, and building a model capable of reflecting the hydrate characteristics through a collaborative Kriging algorithm based on the information of the weighted attributes; and D, on the basis of collaborative Kriging modeling, carrying out global optimization broadband constrained inversion to qualitatively identify the top and bottom interfaces of hydrate. The limitation brought by a single technology and the multi-solution interference are reduced. A favorable target of hydrate can be found more accurately, and the top and bottom interfaces of hydrate can be identified.

Description

technical field [0001] The invention relates to the technical field of identifying hydrate top-bottom interfaces, in particular to a deterministic method for qualitatively identifying hydrate top-bottom interfaces at sea. Background technique [0002] Gas hydrate is an ice-like crystalline substance distributed in deep sea sediments or permafrost in land areas, formed by natural gas and water under high pressure and low temperature conditions. Because it looks like ice and can burn when exposed to fire, it is also called combustible ice or solid gas and air ice. The methane content of natural gas hydrate accounts for 80%-99.9%. The combustion pollution is much smaller than that of coal, oil, and natural gas, and the reserves are abundant. The global reserves are enough for human use for 1,000 years. Therefore, it is regarded by various countries as an alternative energy source for future oil and gas. [0003] At present, geological and geophysical research has been carried ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/301G01V2210/647G01V2210/6652
Inventor 张艳张志让孙庚文汤承锋崔刚张时文王兆峰苟其勇刘荣汤金彪
Owner 西安恒泰艾普能源发展有限公司
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