A dual-source seismic exploration method and system for offshore seismic exploration

Abstract

The invention discloses a double-source seismic exploration method and system based on marine seismic exploration. The method comprises the following steps that the current position of an exploration ship is detected, the time that the exploration ship arrives at a predicted shot point is calculated, and a trigger signal is sent to a control device Tms before the ship arrives at the predicted shot point; after the trigger signal is received, a random array sequence An (S, T1, T2) is generated, and excitation signals are sent to a first gun control system and a second gun control system according to the random array sequence An (S, T1, T2); after the excitation signals are received, a first seismic origin and a second seismic origin are triggered; seismic waves triggered by the first seismic origin and the second seismic origin are sensed and corresponding first seismic data and second seismic data are generated; the first seismic data and the second seismic data are received and are recorded on a recording channel. According to the double-source seismic exploration method and system based on marine seismic exploration, the conventional towing mode of a seismic collection workboat is not changed, multiple seismic data are acquired under the condition that a small amount of activity cost is increased, and therefore requirements for deep-layer seismic exploration are satisfied.

Description

technical field

[0001] The invention relates to the field of marine geophysical exploration, in particular to a dual-source seismic exploration method and system for marine seismic exploration. Background technique

[0002] The marine geophysical surveying system is a system used to collect geophysical data from the strata below the bottom of the water body of a lake or ocean, such as marine seismic data acquisition systems, marine seismic survey systems, and electromagnetic survey systems. A marine seismic survey system typically includes a seismic survey vessel with onboard navigation, seismic energy control, and geophysical data recording equipment. Seismic survey vessels typically tow one or more sensor streamers aft of the vessel. The seismic energy control device activates one or more seismic energy sources at selected times. Signals generated by individual sensors on the sensor streamers in response to the detected seismic energy are ultimately conducted to recordin...

Examples

Embodiment Construction

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0032] Currently used in offshore seismic exploration systems, the underwater equipment towing method of the offshore seismic exploration operation ship is to tow left and right air gun sources and multiple digital cables behind the exploration ship, and the sources are excited alternately every S meters or so, that is, when the source When excited, the energy passes through the seawater, propagates through the seabed to the deep part of the formation, part of the energy propagates downward through the formation, and part of the energy is reflected by the formation interface and propagates upward, and is loaded by a sensor streamer placed at a certain depth in seawater. Seismic sensors spaced apart pick it up and record ...

technical field

[0001] The invention relates to the field of marine geophysical exploration, in particular to a dual-source seismic exploration method and system for marine seismic exploration. Background technique

[0002] The marine geophysical surveying system is a system used to collect geophysical data from the strata below the bottom of the water body of a lake or ocean, such as marine seismic data acquisition systems, marine seismic survey systems, and electromagnetic survey systems. A marine seismic survey system typically includes a seismic survey vessel with onboard navigation, seismic energy control, and geophysical data recording equipment. Seismic survey vessels typically tow one or more sensor streamers aft of the vessel. The seismic energy control device activates one or more seismic energy sources at selected times. Signals generated by individual sensors on the sensor streamers in response to the detected seismic energy are ultimately conducted to recordin...

Examples

Embodiment Construction

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0032] Currently used in offshore seismic exploration systems, the underwater equipment towing method of the offshore seismic exploration operation ship is to tow left and right air gun sources and multiple digital cables behind the exploration ship, and the sources are excited alternately every S meters or so, that is, when the source When excited, the energy passes through the seawater, propagates through the seabed to the deep part of the formation, part of the energy propagates downward through the formation, and part of the energy is reflected by the formation interface and propagates upward, and is loaded by a sensor streamer placed at a certain depth in seawater. Seismic sensors spaced apart pick it up and record ...

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