Advanced Hydrocarbon Mapping As

Eduard B Fainberg

Pavel Barsukov

Bension Sh Singer

A method is proposed for a marine electromagnetic survey based on the TM mode, for the purpose of prospecting for and detecting subsurface hydrocarbon reservoirs. The method includes an electromagnetic field source () that, in a submerged, essentially vertical transmitter antenna, generates and injects electric current pulses () with a sharply defined termination. An electromagnetic field generated by these pulses () is measured by at least one receiver () provided with an essentially vertical receiver antenna () submerged in water, during the interval when the current in the transmitter antenna () of the electromagnetic field source () is switched off. The distance between the electromagnetic field source () and the at least one receiver () is smaller than the depth of the target object. An apparatus is also described, for implementation of the method.

Method for hydrocarbon reservoir mapping and apparatus for use when performing the method

A sensor (S) for marine measurements of an electric field, the sensor (S) including at least two electrodes (); signal transmission means () for transmitting measured signals from the sensor (S) to a signal processing (); at least two closed containers () which are formed of a non-conductive material and are filled with an electrolyte (E); at least two flexible hoses () formed of an electrically non-conductive material; there being attached in a fluid-communicating manner to each of the containers at least one first hose end (), and a second hose end () being open and attached to means () for exact positioning of the second hose end (); the hoses () being arranged to be filled with a medium (W) of the same type as that, in which the sensor (S) is arranged to be immersed in an operative condition; and two containers () forming a pair of containers, the two containers (), relatively, being placed close to each other under approximately identical thermal, pressure and chemical conditions.

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Amersfoort, Netherlands

Eduard B Fainberg