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Transient electromagnetic exploration method and apparatus for tundra natural gas hydrate

A transient electromagnetic and natural gas technology, applied in the field of natural gas hydrate exploration, can solve problems affecting the detection results of natural gas hydrate

Active Publication Date: 2015-12-02
PETROCHINA CO LTD
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Problems solved by technology

All these reasons will affect the detection results of deep gas hydrates

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  • Transient electromagnetic exploration method and apparatus for tundra natural gas hydrate
  • Transient electromagnetic exploration method and apparatus for tundra natural gas hydrate
  • Transient electromagnetic exploration method and apparatus for tundra natural gas hydrate

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Embodiment Construction

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0029] Embodiments of the present invention provide a transient electromagnetic prospecting method and device for natural gas hydrate in permafrost zones. The present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] An embodiment of the present invention provides a transient electromagnetic prospecting method for natural gas hydrates in permafrost zones, such as figure 1 As shown, the transient electromagnetic pro...

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Abstract

The invention provides a transient electromagnetic exploration method and apparatus for tundra natural gas hydrates. The method comprises the following steps: exploration data of an exploration zone is obtained; apparent resistivity characteristics of formation lithology at different depths are analyzed according to frozen soil data, soil resistivity data and rock resistivity data; and a distribution mode of the apparent resistivity is determined; according to the geological data and exploratory well data, geological structure characteristics of the geological exploration area are determined, and measuring lines and measuring points of transient electromagnetic data acquisition are determined; transient electromagnetic data of the exploration area is acquired; apparent resistivity at different depths is respectively calculated according to the transient electromagnetic data in a full-time channel mode and a time-channel segmented mode, and a corresponding apparent resistivity sectional drawing is generated; the actual apparent resistivity sectional drawing is determined according to the distribution mode; and according to the apparent resistivity characteristics, the geological structure characteristics and the real resistivity sectional drawing, the distribution condition of a natural gas hydrate occurrence layer is determined.

Description

technical field [0001] The invention relates to natural gas hydrate exploration technology, in particular to a transient electromagnetic exploration method and device for natural gas hydrate in permafrost zones using electromagnetic technology with depth detection capability. Background technique [0002] Gas hydrate is an insulating solid with high resistivity, which has the physical basis of electromagnetic exploration. Using resistivity logging to identify deep gas hydrate is a commonly used method for gas hydrate exploration. Transient Electromagnetic Method (TEM, Transient Electromagnetic Method) can also detect the electrical characteristics of deep geological bodies, using a grounded wire source (galvanic couple source) or an ungrounded loop (magnetic source) to send a pulsed magnetic field underground. During the intermittent period, the coil or ground electrode is used to observe the secondary eddy current field, and its change over time is studied to detect the ele...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08
Inventor 邢学文刘松张一民邹立群董文彤张强谢兴
Owner PETROCHINA CO LTD
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