Abstract:
In one embodiment the invention comprises a particle velocity sensor that includes a housing with a geophone mounted in the housing. A fluid that substantially surrounds the geophone is included within the housing. The particle velocity sensor has an acoustic impedance within the range of about 750,000 Newton seconds per cubic meter (Ns/m3) to about 3,000,000 Newton seconds per cubic meter (Ns/m3). In another embodiment the invention comprises method of geophysical exploration in which a seismic signal is generated in a body of water and detected with a plurality of co-located particle velocity sensors and pressure gradient sensors positioned within a seismic cable. The output signal of either or both of the particle velocity sensors or the pressure gradient sensors is modified to substantially equalize the output signals from the particle velocity sensors and the pressure gradient sensors. The output signals from particle velocity sensors and pressure gradient sensors are then combined.
Abstract translation:在一个实施例中,本发明包括粒子速度传感器,其包括具有安装在壳体中的地震检波器的壳体。 基本上围绕地震检波器的流体包括在壳体内。 粒子速度传感器的声阻抗在每立方米约750,000牛顿秒(Ns / m 3)至约3,000,000牛顿秒/立方米(Ns / m 3 / SUP>)。 在另一个实施例中,本发明包括地球物理勘探方法,其中在水体中产生地震信号并且利用位于地震缆索内的多个共同定位的粒子速度传感器和压力梯度传感器进行检测。 粒子速度传感器或压力梯度传感器中的任一个或两者的输出信号被修改为基本上均衡来自粒子速度传感器和压力梯度传感器的输出信号。 然后组合来自粒子速度传感器和压力梯度传感器的输出信号。
Abstract:
A seismic streamer includes a jacket covering an exterior of the streamer. At least one strength member extends along the length of the jacket, and is disposed inside the jacket. At least one seismic sensor is disposed is mounted in a respective sensor spacer affixed to the at least one strength member. The streamer include means for retaining the at least one sensor in the respective sensor spacer. The means for retaining provides acoustic isolation between the at least one sensor and the respective spacer.
Abstract:
A marine seismic streamer has a hydrophone housing positioned in the streamer with the hydrophone housing having ends and rigid side walls, a hydrophone positioned in the hydrophone housing, a soft compliant solid material filling the housing, and openings in the hydrophone housing adapted to substantially permit passage of pressure waves and to substantially attenuate passage of shear waves. Another embodiment is a hydrophone housing having ends, rigid side walls, and openings in the hydrophone housing adapted to substantially permit passage of pressure waves and to substantially attenuate passage of shear waves. The openings are open ends of the housing, in the side walls of the housing, in the end walls of the housing, or in both the side walls and end walls of the housing.
Abstract:
A seismic sensor is disclosed which includes at least one particle motion sensor, and a sensor jacket adapted to be moved through a body of water. The particle motion sensor is suspended within the sensor jacket by at least one biasing device. In one embodiment, a mass of the sensor and a force rate of the biasing device are selected such that a resonant frequency of the sensor within the sensor jacket is within a predetermine range.
Abstract:
Depth triggers for marine geophysical survey cable retriever systems. At least some of the illustrative embodiments include causing a submerged geophysical survey cable to surface. In some cases, the causing the cable to surface may include: fracturing a frangible link wherein the frangible link, before the fracturing, affixes position of a piston within a cylinder bore of a housing coupled to the geophysical survey cable, and the fracturing of the frangible link responsive to pressure exerted on a face of the piston as the geophysical survey cable reaches or exceeds a predetermined depth; moving the piston within the cylinder bore; and deploying a mechanism that makes the geophysical survey cable more positively buoyant.
Abstract:
A marine sensor cable comprises a jacket covering an exterior of the sensor cable, wherein the jacket comprises an outer portion containing biocide disposed in a co-extrusion process. A method for producing a marine sensor cable jacket comprises providing a co-extruder to construct a polyurethane jacket for a sensor cable with a first extruder constructing an inner portion of the jacket and a second extruder constructing an outer portion of the jacket; producing a mixture of thermo polyurethane and biocide; supplying thermo polyurethane to the first extruder; supplying the mixture of thermo polyurethane and biocide to the second extruder; and constructing the polyurethane jacket with the outer portion containing the biocide.
Abstract:
A system comprises marine geophysical equipment, adapted for towing through a body of water; and tightly fitting covers, attached to the marine seismic equipment, to fill-in indentations in the marine geophysical equipment, for gathering marine geophysical data. A method comprises marine geophysical equipment having tightly fitting covers, to fill-in indentations in the marine geophysical equipment, attached thereto, for gathering marine geophysical data.
Abstract:
A seismic streamer includes a jacket covering an exterior of the streamer, at least one strength member extending along the length of and disposed inside the jacket, at least one seismic sensor mounted in a sensor spacer affixed to the at least one strength member, and a void filler made from a material introduced into the jacket in liquid form and undergoing state change thereafter. The jacket includes an inner layer in contact with and having adhesiveness to the void filler, and an outer layer disposed over the outer layer and having substantially no adhesiveness.
Abstract:
A seismic streamer includes a jacket covering an exterior of the streamer, at least one strength member extending along the length of and disposed inside the jacket, at least one seismic sensor mounted in a sensor spacer affixed to the at least one strength member, and a void filler made from a material introduced into the jacket in liquid form and undergoing state change thereafter. The jacket includes an inner layer in contact with and having adhesiveness to the void filler, and an outer layer disposed over the outer layer and having substantially no adhesiveness.
Abstract:
A seismic streamer includes a jacket covering an exterior of the streamer. At least one strength member extends along the length of the streamer and is disposed inside the jacket. At least one seismic sensor is disposed in a sensor spacer affixed to the at least one strength member. An encapsulant is disposed between the sensor and the sensor spacer. The encapsulant is a substantially solid material that is soluble upon contact with a void filling material. A void filling material is disposed in the interior of the jacket and fills substantially all void space therein. The void filling material is introduced to the interior of the jacket in liquid form and undergoing state change to substantially solid thereafter.