Hydrate Formation Seismic Physical Simulation Test Equipment Based on Reflected Wavefield

Abstract

The invention belongs to the field of geophysical exploration, and discloses a seismic physical simulation test equipment for hydrate formations based on reflected wave fields. The equipment includes a hydrate preparation device and a reflected acoustic wave testing device; the hydrate preparation device is used to generate simulated hydrate , the reflected acoustic wave testing device is used to continuously emit ultrasonic waves to the simulated hydrate in the generation process, and perform signal processing on the received reflected wave to identify and extract reflection characteristic information and sound wave velocity change information, and continuously monitor the simulated hydrate The saturation of the hydrate is obtained to obtain the corresponding relationship between the reflection characteristic information and the change information of the acoustic wave velocity and the saturation of the simulated hydrate. The present invention obtains the reflection characteristics of the hydrate formation and the change of the sound wave velocity through the acquisition of the reflection wave field of the hydrate formation, and obtains the relationship with the hydrate saturation, which has relatively important guidance for the interpretation of the gas hydrate offshore seismic exploration data and the estimation of the gas hydrate saturation significance.

Description

technical field [0001] The invention belongs to the field of geophysical exploration, and in particular relates to a seismic physical simulation test equipment for a hydrate formation based on a reflected wave field. Background technique [0002] The gas hydrate on the continental seabed has been confirmed by seismic technology, and BSR (Bottom Simulating Reflector, similar to the bottom reflector) has become an important basis for explaining the existence of gas hydrate. The BSR is basically parallel to the seafloor reflection layer. It is a negative polarity reflection located at a depth of several hundred meters below the seafloor, corresponding to the bottom of the hydrate stability zone. From the perspective of acoustic wave impedance, the BSR represents a high impedance layer caused by gas hydrates A formation combination overlaid by a low-resistance layer caused by free gas. Searching for differences in the seismic response characteristics of hydrate-bearing formatio...

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Problems solved by technology

At present, the reflection wave field simulation is mainly through numerical simulation, and the experimental simulation method has not yet proposed an effective solution, because the seismic physical experiment simulation method of hydrate needs the use of natural gas hydrate cores, but the natural gas hydrate cores in sea areas are very easy to Broken, hard to obtain and expensive

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