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Method and device for induced polarization mapping of submarine hydrocarbon reservoirs

A technology of hydrocarbons and polarization effects, applied in electric/magnetic exploration, geophysical measurement, electromagnetic wave detection, etc., can solve the problem of inability to control ice floe movement, reduce possibility and productivity, lack of noise suppression and interpretation And other issues

Inactive Publication Date: 2010-12-01
ADVANCED HYDROCARBON MAPPING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this invention is the inability to control the movement of the ice floes, which significantly reduces its possibilities and productivity; the lack of measurement of the vertical component of the electric field in different layers of the ocean limits the possibility of noise suppression and interpretation

Method used

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  • Method and device for induced polarization mapping of submarine hydrocarbon reservoirs
  • Method and device for induced polarization mapping of submarine hydrocarbon reservoirs
  • Method and device for induced polarization mapping of submarine hydrocarbon reservoirs

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Embodiment Construction

[0053] In a first exemplary embodiment, a single transmitter is mounted on a ship, the transmitter comprising a vertically deployed, elongated single core conductive cable terminated by electrodes, and the cable is submerged in a body of water . The ship moves slowly and the transmitter emits intermittent current pulses with sharp terminations, while the same cable with electrodes is used to measure the medium response during the lapse of time between adjacent current pulses. This is further described in NO 323889, which is hereby incorporated by reference in its entirety.

[0054] Figure 1a A first exemplary embodiment is shown in which a vessel 1 is floating on a water surface 82, which tows a vertically elongated cable 2 terminating in an electrode 4, said cable 2 being submerged in a body of water 8 , towards the seabed 81 . A generator (not shown) is mounted on the ship 1 and is used to emit intermittent current pulses with sharp ends into the cable 2 . The cable wit...

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Abstract

An electromagnetic surveying method based on the detection of induced polarization effect and evaluation of its characteristics for mapping marine hydrocarbon targets, is characterized by a) the vertical deployment in a body of water (8) of at least one electric wire (2, 3, 3') which forms an electromagnetic transmitter which emits electromagnetic energy arranged to excite an electromagnetic field in the body of water (8) and underlying medium (83), the same wire (2, 3, 3') being used as a receiver for measurements of the vertical component of the electric field; the method including: b) providing survey data as the spatial distribution of the vertical component of the electric field and the medium response in the form of apparent resistivity versus time in the body of water (8); c) performing a space / time analysis of the vertical component of the electric field and response with the purpose of detecting induced polarization effect and d) mapping the anomalous zones.

Description

technical field [0001] The present invention describes a method for rapid and direct mapping of irregularities associated with subsea hydrocarbons. The method is based on induced polarization effects observed in the electromagnetic field measured by a congruent vertical transmitter / receiver line moving over the seafloor reservoir. Background technique [0002] Two methods are currently used to detect and characterize hydrocarbon-laden aquifers in deep water. [0003] The first method is based on the acoustic detection of a horizontally layered conductance section located below the seawater layer. This section represents sediment. Embedded at some depth in these deposits are thin resistive reservoirs containing hydrocarbons. Powerful transmitters excite alternating currents in the seawater layer and below, and one or more electrical and / or magnetic recorders located at various locations above the seabed record electromagnetic responses from said sections. Images of these ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/12
CPCG01V3/12G01V3/083Y02A90/30
Inventor E·B·法因贝格P·巴尔苏科夫J·K·谢斯塔德
Owner ADVANCED HYDROCARBON MAPPING