Hydrate stratum earthquake physical simulation test equipment and method based on reflected wave field

Abstract

The invention belongs to the field of geophysical exploration, and discloses hydrate stratum earthquake physical simulation test equipment and method based on a reflected wave field, and the equipmentcomprises a hydrate preparation device and a reflected sound wave test device. The hydrate preparation device is used for generating simulated hydrate; the reflected sound wave testing device is usedfor continuously emitting ultrasonic waves to the simulated hydrate in the generation process, receiving reflected waves, performing signal processing on the received reflected waves to identify andextract reflection characteristic information and acoustic velocity change information, and continuously monitoring the saturation degree of a simulated hydrate to obtain a corresponding relationshipbetween the reflection characteristic information and the acoustic velocity change information and the saturation degree of the simulated hydrate. According to the equipment and the method, hydrate stratum reflection characteristics and sound wave speed changes are acquired through hydrate stratum reflection wave field acquisition, the relationship with the hydrate saturation is obtained, and theequipment and the method have relatively important guiding significance for gas hydrate offshore seismic exploration data interpretation and gas hydrate saturation estimation.

Description

technical field [0001] The invention belongs to the field of geophysical exploration, and in particular relates to a seismic physical simulation test device and method 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 ...

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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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