公开(公告)号：WO2010002263A2

公开(公告)日：2010-01-07

申请号：PCT/NO2009/000097

申请日：2009-03-16

Applicant: MultiField Geophysics AS ,  JOHNSTAD, Svein, Erling

Inventor： JOHNSTAD, Svein, Erling

IPC: G01V1/20 ,  G01V11/00

CPC classification number: G01V11/00 ,  G01V1/201 ,  G01V3/083 ,  G01V3/12 ,  G01V2210/6163

Abstract: The invention is a marine geophysical sensor cable (1) with one or more sensor cable sections (2), - each of said sensor cable sections (2) provided with seimic and electromagnetic sensors (10, 20) arranged along said cable (1), - the seismic sensors (10) comprising a hydrophone (11) and a seismic component receiver (12) for seimic vector measurments while said sensor cable (1) being at the seafloor, - the electromagnetic sensors (20) comprising both E-field sensors (22) and H-field sensors (24) - said E-field sensors (22) comprising pairs of first and second electrodes (22a, 22b) arranged with different positions along the cable (1) and connected to a voltage amplifier (23), - The H-field sensors (24) comprising three mutually orthogonally arranged H-field component sensors (24x, 24y, 24z).

Abstract translation: 本发明是一种具有一个或多个传感器电缆部分（2）的海洋地球物理传感器电缆（1）， - 每个所述传感器电缆部分（2）设置有沿着所述电缆（1）布置的感性和电磁传感器（10,20） ， - 所述地震传感器（10）包括水听器（11）和地震成分接收器（12），用于在所述传感器电缆（1）处于海底时进行神经矢量测量，所述电磁传感器（20）包括两个E场 传感器（22）和H场传感器（24） - 所述E场传感器（22）包括沿着电缆（1）布置有不同位置的第一和第二电极对（22a，22b），并连接到电压放大器 23），H场传感器（24）包括三个相互正交排列的H场分量传感器（24x，24y，24z）。

公开(公告)号：EP1987375B1

公开(公告)日：2012-12-12

申请号：EP07709226.0

申请日：2007-02-12

Applicant: Multifield Geophysics AS

Inventor： WESTERDAHL, Harald ,  JOHNSTAD, Svein, Erling ,  FARRELLY, Brian, Anthony

IPC: G01V3/12 ,  G01V3/38

CPC classification number: G01V3/12 ,  G01V3/083 ,  Y02A90/344

Abstract: A method for analyzing acquired electromagnetic measurements (R) made at or in a sea (4) over a seafloor (1) with rock formations (3) having relatively low resistivity (&rgr;3) for detecting a possibly underlying petroleum bearing reservoir formation (2) having relatively high resistivity (&rgr;2), wherein a low frequency electromagnetic transmitter (5) arranged in the sea (4) emits an electromagnetic field (P) propagating in the sea (4), in the rocks (3, 2) and in the air (0) above the sea; wherein electromagnetic sensors (6) are arranged with desired offsets (x) in the sea (4) for measuring the electromagnetic field (P(x)) while the field propagates, characterized in that one or more component of the electromagnetic field (P) is measured at least one large offset (xL) from the transmitter (5) where the field (P) essentially only has its origin from the field propagating as a field (P0) through the air (0); that the one or more components of the electromagnetic field (P) measured at the large offset (xL) is calculated back to a recalculated field (F0(x)) to one or more offsets (x) being shorter than the large offset (xL); that the recalculated field (P0(X)) is subtracted from the field (P(x)) for possibly highlighting a field which arising due to the possibly petroleum bearing reservoir formation (2) having relatively high resistivity (&rgr;2).

公开(公告)号：EP2307913A2

公开(公告)日：2011-04-13

申请号：EP09773796.9

申请日：2009-03-16

Applicant: Multifield Geophysics AS

Inventor： JOHNSTAD, Svein, Erling

IPC: G01V11/00

CPC classification number: G01V11/00 ,  G01V1/201 ,  G01V3/083 ,  G01V3/12 ,  G01V2210/6163

Abstract: A geophysical sensor cable has one or more sensor cable sections. Each of the sensor cable sections is provided with seismic and electromagnetic sensors arranged along said cable. The seismic sensors include a hydrophone and a seismic component receiver for seismic vector measurements while the sensor cable is at the sea-floor. The electromagnetic sensors include both E-field sensors and H-field sensors. The E-field sensors include pairs of first and second electrodes arranged with different positions along the cable and connected to a voltage amplifier. The H-field sensors include three mutually orthogonally arranged H-field component sensors.

公开(公告)号：EP1987375A1

公开(公告)日：2008-11-05

申请号：EP07709226.0

申请日：2007-02-12

Applicant: Multifield Geophysics AS

Inventor： WESTERDAHL, Harald ,  JOHNSTAD, Svein, Erling ,  FARRELLY, Brian, Anthony

IPC: G01V3/12 ,  G01V3/38

CPC classification number: G01V3/12 ,  G01V3/083 ,  Y02A90/344

Abstract: A method for analyzing acquired electromagnetic measurements (R) made at or in a sea (4) over a seafloor (1) with rock formations (3) having relatively low resistivity (&rgr;3) for detecting a possibly underlying petroleum bearing reservoir formation (2) having relatively high resistivity (&rgr;2), wherein a low frequency electromagnetic transmitter (5) arranged in the sea (4) emits an electromagnetic field (P) propagating in the sea (4), in the rocks (3, 2) and in the air (0) above the sea; wherein electromagnetic sensors (6) are arranged with desired offsets (x) in the sea (4) for measuring the electromagnetic field (P(x)) while the field propagates, characterized in that one or more component of the electromagnetic field (P) is measured at least one large offset (xL) from the transmitter (5) where the field (P) essentially only has its origin from the field propagating as a field (P0) through the air (0); that the one or more components of the electromagnetic field (P) measured at the large offset (xL) is calculated back to a recalculated field (F0(x)) to one or more offsets (x) being shorter than the large offset (xL); that the recalculated field (P0(X)) is subtracted from the field (P(x)) for possibly highlighting a field which arising due to the possibly petroleum bearing reservoir formation (2) having relatively high resistivity (&rgr;2).