Method and device for calculating thickness of natural gas hydrate reservoir

Abstract

The invention discloses a method and a device for calculating the thickness of a natural gas hydrate reservoir. The method comprises the following steps: carrying out three-dimensional seismic data acquisition in a natural gas hydrate reservoir work area, carrying out amplitude preservation processing on the acquired seismic data, and carrying out superposition to obtain a post-stack seismic data volume; performing structural interpretation on the post-stack seismic data volume, and determining a top layer position and a bottom layer position of a stratum where the natural gas hydrate reservoir is located; cutting out a seismic data volume according to the top layer position and the bottom layer position of the stratum where the natural gas hydrate reservoir is located, and obtaining a target seismic data volume; and acquiring the natural gas hydrate reservoir thickness between the top layer position and the bottom layer position. The method and the device for calculating the thickness of the natural gas hydrate reservoir, disclosed by the invention, can be applied to estimating the thickness of the marine natural gas hydrate reservoir in allusion to the condition that a stratum containing the natural gas hydrate and a mudstone stratum are in equal thickness alternation frequently occurring in the marine natural gas hydrate reservoir. Therefore, the problem that the thickness of the thin interbed cannot be estimated, which puzzles exploration workers all the time, is solved.

Description

technical field [0001] The invention relates to the field of natural gas hydrate exploration, and relates to a calculation method and device for the thickness of natural gas hydrate reservoirs. Background technique [0002] At present, the more commonly used technique to calculate the thickness of underground oil and gas reservoirs is to use the tuned thickness to estimate. After research, Neidell et al. gave the definition of tuning thickness, that is, when a formation with a thickness of λ / 4 (λ is the wavelength of seismic wavelet) is embedded in a certain medium, the reflected wave generated from the top and bottom of the thin layer The coherence is strengthened and the amplitude is the strongest. This thickness is the tuning thickness. When the thickness of the formation is equal to λ / 4, not only the maximum amplitude appears on the corresponding seismic record, but also the peak time difference at this time is exactly equal to the thickness of the formation. [0003] ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for calculating the thickness of natural gas hydrate reservoirs to solve the problem of inaccurate calculation of the thickness of natural gas hydrate reservoirs

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