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Transient electromagnetic prospecting method and device for natural gas hydrate in permafrost zone

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: 2017-10-17
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
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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 prospecting method and device for natural gas hydrate in permafrost zone
  • Transient electromagnetic prospecting method and device for natural gas hydrate in permafrost zone
  • Transient electromagnetic prospecting method and device for natural gas hydrate in permafrost zone

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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 present invention provides a method and device for transient electromagnetic exploration of natural gas hydrate in permafrost zones. The method includes: obtaining exploration data of the exploration area; Determine the distribution pattern of apparent resistivity; determine the geological structure characteristics of the exploration area according to geological data and exploration well data, and determine the survey lines and points for transient electromagnetic data collection; collect transient electromagnetic data in the exploration area Data; use the full-time channel method and the time-channel segmentation method to calculate the respective apparent resistivities according to the transient electromagnetic data, and generate the corresponding apparent resistivity section diagram; determine the actual apparent resistivity section diagram according to the distribution mode; according to the apparent resistivity The distribution of natural gas hydrate reservoirs can be judged based on the characteristics, geological structure characteristics and actual apparent resistivity cross-section diagram.

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 of the magnetic field, the coil or ground electrode is used to observe the secondary eddy current field, and to study its change over ti...

Claims

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Application Information

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Patent Type & Authority Patents(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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