Natural gas hydrate reservoir information evaluation method and application thereof
An information evaluation, hydrate technology, applied in the field of natural gas hydrate reservoir exploration
Active Publication Date: 2020-10-30
OCEAN UNIV OF CHINA
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Problems solved by technology
[0003] To sum up, the problem existing in the existing technology is that AVO forward modeling plays an important role in identifying gas hydrate reservoirs using seismic exploration methods
[0005] (1) The influence of thin layer thickness on the calculation of reflection coefficient
Method used
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[0043] In order to make the object, technical solution and advantages of the present invention clearer, 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.
[0044] Aiming at the problems existing in the prior art, the present invention provides a method for assessing natural gas hydrate reservoir information. The present invention will be described in detail below in conjunction with the accompanying drawings.
[0045] Such as figure 1 As shown, the gas hydrate reservoir information evaluation method provided by the embodiment of the present invention includes the following steps:
[0046] S101: Starting from the four influencing factors of gas hydrate microscopic model, reservoir porosity, hydrate saturation and reservoir thickness, multiple gas hydrate reservoir models are gene...
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Abstract
The invention belongs to the technical field of natural gas hydrate reservoir exploration, and discloses a natural gas hydrate reservoir information evaluation method and application thereof. Generating a plurality of natural gas hydrate reservoir models from the microcosmic mode, reservoir porosity, hydrate saturation and reservoir thickness of the natural gas hydrate based on a biphasic medium theory; a Brekhovski equation is used for accurately describing an AVO curve of a natural gas hydrate model, indirect relation between typical hydrate reservoir AVO marks and reservoir rock physical parameters is established, and therefore prediction and evaluation of a hydrate reservoir are achieved. According to the method, a Brekhovski equation considering the thickness of the thin layer is usedas a basic formula, the limitation of semi-infinite medium hypothesis of a Zoeppritz equation is avoided, the calculation of the AVO curve of the thin layer is more accurate, and the prediction and evaluation precision of the hydrate reservoir is improved.
Description
technical field [0001] The invention belongs to the technical field of exploration of natural gas hydrate reservoirs, and in particular relates to a method for evaluating information of natural gas hydrate reservoirs and its application. Background technique [0002] In the identification of gas hydrate reservoirs using seismic AVO technology, AVO forward modeling research is one of the important links. The theoretical basis of the traditional AVO forward analysis of the gas hydrate model is the Zoeppritz equation and its approximate formula under the assumption of an infinite half-space. The research object is a single formation or a thick formation, and the thickness of the thin layer where the gas hydrate occurs is not considered. The influence on the reflection coefficient, the reflection coefficient in the thin layer cannot be accurately calculated, and it is difficult to describe the actual AVO curve of the thin reservoir. Therefore, the traditional AVO analysis based...
Claims
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Login to View More IPC IPC(8): G01V1/28G01V1/30G06F17/11
CPCG01V1/282G01V1/306G01V1/30G06F17/11Y02A10/40
Inventor 张进王尧刘怀山邢磊王林飞尹燕欣
Owner OCEAN UNIV OF CHINA