A method of mapping hydrocarbon reservoirs in shallow waters and also an apparatus for use when practicing the method
A technology for hydrocarbons and reservoirs, applied in the direction of special electric/magnetic detection, measurement devices, water resource assessment, etc. during transportation, can solve problems such as restrictions and impermissible measurement of important levels of signals
Inactive Publication Date: 2012-10-17
ADVANCED HYDROCARBON MAPPING
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Problems solved by technology
In addition, the normal use of this system in shallow water is problematic, since the vertical orientation of the transmitter and receiver cables does not allow to achieve significant levels of the measurement signal
This condition imposes limitations on at what depth a target can be detected by using TEMP-VEL in shallow water
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[0029] The method proposed according to the present invention can be applied in both shallow and deep waters. It is characterized by high sensitivity and high resolution equivalent to resistive targets. Furthermore, the new method and device provide greater effectiveness in surveying than the TEMP-VEL system using vertical transmitter and receiver cables.
[0030]First, the use of one of two possible configurations is implemented. In a first configuration, the electric field is applied by using vertical cables that generate only TM electromagnetic fields in the layered medium. In this configuration, a horizontal, radially oriented cable is used to record the cross-sectional response. In a second configuration, a horizontal transmitter cable is used to apply current to the water, while a vertical receiver is used to measure the vertical component of the electric field associated with the TM field. In this way, a system with mutually orthogonal transmitter and receiver cables...
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A system for marine electromagnetic surveying of hydrocarbon reservoirs is proposed. The system proposed is characterized by high sensitivity to targets containing hydrocarbons and an ability to work in shallow and deep waters. The system includes a transmitter setting up current pulses in water (2) through a submerged, vertical or horizontal transmitter cable (7a, 7b, 8) and a registration subsystem (9) connected to electrodes (11) on vertical or horizontal receiver cables (10a, 10b). The transmitter generates a special sequence of sharply terminated pulses of the electric current, the electric field being measured in the water in the pauses between these pulses. The straight line through the receiver electrodes lies in the same vertical plane as the terminations of the transmitter cable(7a, 7b). The measurements are carried out with an offset between the transmitter cable (7a, 7b) and the receiver cables (10a, 10b) which is smaller than the depth of the targeted reservoir of hydrocarbons, measured from the sea floor (3).
Description
technical field [0001] The present invention relates to methods and apparatus for mapping subsea hydrocarbon reservoirs, more specifically by using TM-mode electromagnetic fields for registering transverse magnetic (TM) responses measured by one or more submerged receivers source by using a substantially vertically or horizontally oriented transmitter and one or more substantially horizontally or respectively vertically oriented receivers and by submerging the transmitter in water during the time intervals when the current on the source of the electromagnetic field is turned off Intermittent current pulses with sharp terminals are generated, and the electromagnetic field is generated by these pulses measured by a receiver immersed in water. The dipoles of the electromagnetic field source and the dipoles of the receiver are offset by less than the depth to the target object. Background technique [0002] Seismic surveys provide reliable information about the presence, locati...
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IPC IPC(8): G01V3/12G01V3/17
CPCG01V3/12G01V3/083Y02A90/30
Inventor 帕维尔·巴尔苏考夫埃杜尔德·B.·费恩伯格班申·Sh.·辛格
Owner ADVANCED HYDROCARBON MAPPING