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Research method for determining intersecting position of gas hydrate BSR (Bottom Simulating Reflection) interface and sea bottom

A hydrate and natural gas technology, applied in the field of natural gas hydrate exploration, can solve problems such as ecological environment and climate impact, and achieve the effects of strong universality, simple operation, and reliable accuracy

Inactive Publication Date: 2018-03-30
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Leakage of methane at this location into seawater or the atmosphere can also have serious ecological and climate impacts

Method used

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  • Research method for determining intersecting position of gas hydrate BSR (Bottom Simulating Reflection) interface and sea bottom
  • Research method for determining intersecting position of gas hydrate BSR (Bottom Simulating Reflection) interface and sea bottom
  • Research method for determining intersecting position of gas hydrate BSR (Bottom Simulating Reflection) interface and sea bottom

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Embodiment Construction

[0038] Below in conjunction with the accompanying drawings, the present invention will be described in detail through specific embodiments, but the use and purpose of these exemplary embodiments are only used to illustrate the present invention, and do not constitute any form of any limitation on the actual protection scope of the present invention, let alone The protection scope of the present invention is limited thereto.

[0039] Such as figure 1 As shown, the present invention discloses a research method for determining the intersecting position of the gas hydrate BSR interface and the seabed, comprising the following steps:

[0040] Step ①: Select the research area where hydrates are developed and the BSR features are obvious in the seismic data, and select the seismic section along the slope direction at the shallow part of the BSR distribution on the landward side. For details, refer to Figure 2a ;

[0041] Step ②: Determine the phase equilibrium stability curve of n...

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Abstract

The invention discloses a research method for determining the intersecting position of a gas hydrate BSR (Bottom Simulating Reflection) interface and the sea bottom, and belongs to the technical fieldof gas hydrate exploration. According to the method, the intersecting position of the BSR interface and the sea bottom of a global sea area hydrate development zone can be accurately judged, and thusthe landward-side distribution boundary of a marine gas hydrate stabilization zone is mastered, namely, the shallowest water depth position of the hydrate stabilization zone. The method is simple tooperate and reliable in accuracy, does not consider geothermal gradient and sea water temperature variation curves, can work out the intersecting position by only utilizing sea bottom temperature andpressure parameters through combining hydrate phase balance conditions and has very high universality. If the method is applied to a hydrate development zone of the global sea area, the landward-sideshallow boundary of the global sea area hydrate stabilization zone is drawn, so that the research method has important significance for the research on the aspects such as sea bottom disasters, ecology and climate changes and can be widely applied to gas hydrate exploration.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploration, in particular to a research method for determining the intersection position of a natural gas hydrate BSR interface and a seabed. Background technique [0002] Hydrates are mainly formed under the environmental conditions of low temperature and high pressure, and their stability is very sensitive to the temperature and pressure conditions. Bottom simulating reflection (BSR for short: BSR) on seismic data is generally considered to be a seismic indicator for the existence of gas hydrate, and represents the bottom boundary of the gas hydrate stability zone (GHSZ for short). It is generally believed that the hydrate stability zone GHSZ in the marine environment ranges from the seabed to the BSR, and is a wedge-shaped body thickening toward the sea. However, not all GHSZs have natural gas hydrates. In addition to stable temperature and pressure conditions, the formation of hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/38
CPCG01V1/38G01V1/3808
Inventor 杨金秀王民卢双舫肖佃师张天宇
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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