-
公开(公告)号：EP0397318A3
公开(公告)日：1991-07-31
申请号：EP90303552.5
申请日：1990-04-03
CPC分类号： G01V1/145 , B06B1/0611
摘要： A seismic energy source apparatus (20) includes a stack (92,92′) of piezoelectric elements, means (58,96) for applying voltages thereto to cause the stack to vary in length. A hydraulic system including a power piston (90,90′) coupled to the stack, a drive piston (84,84′) and an incompressible fluid therebetween, amplifies the small movements of the stack, and the amplified movements are imparted to an earth formation. The amplified movements may be reciprocating torsional or radial, for example.
-
公开(公告)号：EP0397318B1
公开(公告)日：1994-01-05
申请号：EP90303552.5
申请日：1990-04-03
CPC分类号： G01V1/145 , B06B1/0611
-
公开(公告)号：EP0203227B1
公开(公告)日：1992-07-22
申请号：EP85200868.9
申请日：1985-05-31
-
公开(公告)号：EP0184231B1
公开(公告)日：1992-01-22
申请号：EP85201658.3
申请日：1985-10-10
-
公开(公告)号：EP0400775A3
公开(公告)日：1991-10-30
申请号：EP90301917.2
申请日：1990-02-22
CPC分类号： G01V1/3808 , G01V1/364 , G01V2210/3246
摘要： A marine seismic reflection prospecting method and system in which coherent noise is attenuated through reinforcement of primary reflection data by the addition of corrected ghost reflection data. The system includes a seismic energy source, a detector, a wavefield separator, a time-shift element, and an element for generating an output signal representative of an additive linear combination of time-aligned primary and ghost signal components. The system's output is suitable for further pre-stack processing, e.g. NMO correction.
-
6.发明公开Marine seismic surveying utilizing dual streamers 失效Seeseismische Untersuchungen unter Verwendung von zwei Messkabeln。
公开(公告)号：EP0400776A2
公开(公告)日：1990-12-05
申请号：EP90301918.0
申请日：1990-02-22
IPC分类号： G01V1/38
CPC分类号： G01V1/3808 , G01V1/364 , G01V2210/3246
摘要： A marine seismic surveying method utilizes two vertically spaced marine streamers (18,20) each having a plurality of seismic detectors (22,24) contained therein, and a seismic energy source (16) positioned at or near the surface (38) of a body of water (10) to generate seismic waves (30,32,34) which propagate into earth formations (26,28) below the water and reflect back up to be detected at each streamer. Seismic waves also reflect from the water/air interface back down toward the streamers. The seismic waves detected at two selected vertically displaced seismic detectors (22,24) are combined to form a sum signal which is then combined with a scaled time integral of a difference signal to form a resultant signal which preserves either the upgoing or downgoing seismic waves. In a preferred embodiment of the present invention, the sum signal and the integral signal are both filtered to remove DC bias and low frequency components prior to the combination. Additionally, the time integral of the difference signal is preferably scaled by balancing the power therein with the power in the sum signal, thereby automatically adjusting for variations in detector spacing which may occur. In one embodiment of the present invention, the upgoing signal and downgoing signal are time shifted and combined to maximize the resultant signal-to-noise ratio.
摘要翻译： 海洋地震测量方法利用两个垂直间隔的海洋拖缆（18,20），每个海洋拖缆具有容纳在其中的多个地震检测器（22,24），以及一个位于或靠近一个地面（38）的地震能量源 水体（10），以产生传播到水下方的地层（26,28）的地震波（30,32,34），并反射回以在每个拖缆处检测。 地震波也从水/空气界面反射回流光。 在两个选定的垂直位移地震检测器（22,24）处检测到的地震波被组合以形成和信号，然后将其与缩放的差分信号的时间积分组合以形成合成信号，其保存上行或下行的地震波 。 在本发明的优选实施例中，对信号和积分信号进行滤波以在组合之前去除DC偏置和低频分量。 此外，差分信号的时间积分优选地通过平衡和中的信号中的功率来平衡其功率，由此自动调整可能发生的检测器间隔的变化。 在本发明的一个实施例中，上行信号和下行信号被时移并组合以最大化所得到的信噪比。
-
公开(公告)号：EP0400775A2
公开(公告)日：1990-12-05
申请号：EP90301917.2
申请日：1990-02-22
CPC分类号： G01V1/3808 , G01V1/364 , G01V2210/3246
摘要： A marine seismic reflection prospecting method and system in which coherent noise is attenuated through reinforcement of primary reflection data by the addition of corrected ghost reflection data. The system includes a seismic energy source, a detector, a wavefield separator, a time-shift element, and an element for generating an output signal representative of an additive linear combination of time-aligned primary and ghost signal components. The system's output is suitable for further pre-stack processing, e.g. NMO correction.
摘要翻译： 一种海洋地震反射探测方法和系统，其中通过增加校正的重影反射数据通过增强主反射数据来衰减相干噪声。 该系统包括地震能量源，检测器，波场分离器，时移元件和用于生成表示时间对准的主信号分量和虚反射信号分量的加性线性组合的输出信号的元件。 该系统的输出适用于进一步的预堆叠处理，例如， NMO修正。
-
公开(公告)号：EP0184231A2
公开(公告)日：1986-06-11
申请号：EP85201658.3
申请日：1985-10-10
摘要： A geophone spring system for suspending a reference mass which comprises first means (2,3,5) for centering the reference mass both laterally and along its axis and second means (4,7i for centering the reference mass laterally and for providing a heavily damped compliance in a radial direction to prevent the first means (2,3,5) from being stressed beyond its elastic limits.
摘要翻译： 一种地震检波器弹簧系统，用于悬挂一个参考质量块，该参考质量块包括第一装置（2,3,5）和第二装置（4,7i），该第一装置（2,3,5）用于使参考质量在侧面和沿着其轴线定心，用于使参考质量横向居中并用于提供重阻尼 沿径向方向的顺应性以防止第一装置（2,3,5）受到超过其弹性极限的应力。
-
公开(公告)号：EP0400776A3
公开(公告)日：1991-10-30
申请号：EP90301918.0
申请日：1990-02-22
IPC分类号： G01V1/38
CPC分类号： G01V1/3808 , G01V1/364 , G01V2210/3246
摘要： A marine seismic surveying method utilizes two vertically spaced marine streamers (18,20) each having a plurality of seismic detectors (22,24) contained therein, and a seismic energy source (16) positioned at or near the surface (38) of a body of water (10) to generate seismic waves (30,32,34) which propagate into earth formations (26,28) below the water and reflect back up to be detected at each streamer. Seismic waves also reflect from the water/air interface back down toward the streamers. The seismic waves detected at two selected vertically displaced seismic detectors (22,24) are combined to form a sum signal which is then combined with a scaled time integral of a difference signal to form a resultant signal which preserves either the upgoing or downgoing seismic waves. In a preferred embodiment of the present invention, the sum signal and the integral signal are both filtered to remove DC bias and low frequency components prior to the combination. Additionally, the time integral of the difference signal is preferably scaled by balancing the power therein with the power in the sum signal, thereby automatically adjusting for variations in detector spacing which may occur. In one embodiment of the present invention, the upgoing signal and downgoing signal are time shifted and combined to maximize the resultant signal-to-noise ratio.
-
公开(公告)号：EP0381367A3
公开(公告)日：1991-09-18
申请号：EP90300755.7
申请日：1990-01-24
发明人： Sallas, John J.
IPC分类号： G01V1/02
CPC分类号： G01V1/006 , Y10S367/905
摘要： A method of reducing horizontally propagating pressure waves in marine seismic exploration to improve the signal-to-noise ratio at associated receivers and reduce interference at unassociated receivers, comprises providing marine vibrators (12,14,16,18) in an array with a given separation between each vibrator, so that horizontally propagating pressure waves from the vibrators which generally traverse the array are out-of-phase at most frequencies of vibration. The amplitude output from each vibrator varies with the output frequency of each vibrator to maximise the cancellation of out-of-phase pressure waves along the array. A receiver, which usually includes a plurality of hydrophones (34,36,38) disposed in a streamer (20), is spaced from the marine vibrators at a distance sufficient to establish the receiver as being in the far-field. The output of each of the marine vibrators is locked in phase and frequency with a known pilot signal so that downwardly propagating pressure waves are substantially unaffected. The overall effect is a narrowing of the radiation pattern of the pressure waves. The resulting radiation pattern effectively directs pressure waves downwardly toward an underwater land formation; and reduces horizontally propagating pressure waves which normally result in interference with marine seismic receivers.
-
-
-
-
-
-
-
-
-
搜索结果
21 条记录 (耗时 0.013 秒)
