TH86846A - How to use electromagnetic devices in shallow water Using regulated origin - Google Patents

Abstract

DC60 Method for analyzing data from electromagnetic-derived measurements (R) performed at sea or at sea (4) above the seafloor (1) to shale (3) with relatively low resistivity (Row 3). For detecting strata Store containing petroleum, possibly underneath (2), relatively high resistance (Ro 2), where the transmitter The low frequency electromagnetic signal (5) arranged in the sea (4) emits the electromagnetic field (P) that spreads in the sea (4), in the rocks (3, 2) and in the air (0) over the sea, where The electromagnetic receiver (6) is arranged with the required separation distance (x) in the sea (4) for measuring the electromagnetic field (P (x)) as the field propagates. This gives it the effect that one or more of the electromagnetic field (P) components That would be measured at at least one large junction (XL) from the transmitter (5), where the field (P) originated from the spreading field (P0) through the air (0). Indeed, one or more of the electromagnetic field (P) components that are measured at large junction (XL) are calculated back. To the recalculated field (F0 (x)) given one or more junctions (x) shorter than the large junction (XL) and the recalculated field (P0 (x)) is removed. From the field (P (x)) to make it possible to Highlight the field formed from petroleum-containing reservoirs in a possible manner (2) with relatively high resistivity (Ro 2) (Figure 1 for summary). Method for analyzing data from electromagnetic measurements. Acquired (R) which is performed at sea or in the sea (4) above the seafloor (3) with relatively low resistance (formula 3) for detecting quarantine strata. It is possible to store petroleum (2) with relatively high resistance (formula 2) where the transmitter The low frequency electromagnetic signal (5) arranged in the sea (4) emits the electromagnetic field (P) that spreads in the sea (4), in the rocks (3,2) and in the air (0) over the sea, where The electromagnetic receiver (6) is arranged with the required separation distance (X) in the sea (4) for the electromagnetic field (P (x)) as the field propagates. This gives the effect that part of the electromagnetic field (P) component is Than to be measured at at least one large junction (formula l) from the transmitter (5), where the field (P) originates from the field propagated in the form of a field (formula 0) through the air ( Indeed, one or more of the electromagnetic field components (P) that are measured at large junctions (formula l) are calculated back. To the recalculated field (formula 0 (x)) given to be one or more junction (x) distances shorter than the large junction (X), and the recalculated field (formula (x)) is removed. Out of the field (P (x)) to make it possible to Emphasize the field formed from petroleum-containing reservoirs in a possible manner (2) with relatively high resistance (Formula 2).

Claims (7)

Disclaimer (all) which will not appear on the advertisement page: Hot edit 24/12/18 (No disclaimer) -------------------- ------------------ 1. A method for processing and analyzing data from derived (R) electromagnetic measurements performed at sea or at sea (4). Above the seafloor (1) with relatively low resistivity (p3) shale (3) for detecting petroleum-containing reservoirs, possibly below (2) of relatively high resistivity (p2). ) Where the low frequency electromagnetic transmitters (5) are arranged in sea (4) and emit electromagnetic fields (F) that spread in the sea (4), in rocks (3,2) and in the air (0 ) Over the sea, with the electromagnetic receiver (6) arranged with the desired separation distance (x) in the sea. (4) For measuring electromagnetic field (p (x)) as the field spreads Which makes it special in that One or more electromagnetic field (F) components are measured at at least one large junction (XL) from the transmitter (5), where the field (F) will begin from the radiated field. Diffuse in form of field (p0) that only literally passes through air (0). Electromagnetic field components (F) One or more parts that were measured at the large junction (XL) are calculated back to the recalculated field. (F0 (x)) is one or more intersections (x). The shorter the larger junction (XL), the newly calculated field (F0 (x)) is removed from the field. (F (x)) to make it possible to highlight the field which There is a starting point in the basement resistance fault, for example, petroleum-containing reservoirs of any possible manner (2) with relatively high resistance (p2) 2. Method according to claim 1. Where such transmitter (5) will be towed in the sea and the receiver It is stationary 3. Method of claim 1 where the electromagnetic field (F) released is an alternating field. The frequency ranges from 0.01 to 20O HZ 4. Method according to claim 3 where the electromagnetic field (F) released is an alternating field. The frequency ranges from 0.1 to 1 Hz. 5. Claim Method 1 where the said component of the electromagnetic field (F) that is measured as an electric field (E). 6. Claims method. 1 where such component of the said electromagnetic field (F) is measured as a magnetic field (B) 7. Method according to claim 1 where such transmitter (5) applied will consist of electrodes. (50A, 50B) are arranged with such isolation at sea (4) to make up the transmitter. Electrical signal pair (5) 8. Method according to claim 7 where the transmitter (5) is a signal antenna. In general, such electrodes (50A, 50B) are arranged at a typical depth only. 9. Method according to claim 8 whereby such receiver (6) will They are arranged in pairs of electrodes on a separate measuring station or in the form of electrodes along the receiver connection cable. Which is arranged along a straight line (7), generally spanning from the aforementioned transmitter (5) 1 0. Method according to claim 9 whereby the main axis of the transmitter (5) is The core between the aforementioned electrodes (50A, 50B), for the case where the source is a pair of electrodes, will go in the same vertical plane as the aforementioned line (7) 1. 1. Method according to claim 9, where the core of the aforementioned transmitter (5) is the core between the aforementioned electrodes (50A, 50B), for the case where the source is a bipolar electrode, Lie perpendicular to the vertical plane, generally in such lines (7) with such electrodes (6) 1. 2. Method according to claim 1, whereby such (5) transmitters are arranged in, on or near the surface of the sea (4), as mentioned 1 3. Method according to claim 1, where such transmitter will be submerged in the sea (4) as mentioned 1 4. Method for claim 13, where such transmitter (5) will be arranged on or near (on the seafloor (1) 1. 5. Means of claim 13 whereby the transmitter (5) is arranged between the seabed (1) and the sea surface (4) 1. 6.The method follows claim 1, where the depth of the seabed (1) beneath the sea surface (4) is less / shallow than the depth of the petroleum-containing reservoir (2). ) Under the sea floor (1) literally 1 7. Method for claim 1 whereby the applied transmitter (5) will consist of A bipolar magnetic source or a combination of a bipolar electrode source and a bipolar magnetic source.