Synthetic focusing method for excited polarized logging

A technology of excitation polarization and focusing method, which is applied in the direction of electric/magnetic detection for well logging records, can solve the problems of limited practical application range, low resolution and measurement accuracy, and achieve the purpose of improving layering ability and improving The effect of measurement accuracy

Inactive Publication Date: 2005-02-16
BC P INC CHINA NAT PETROLEUM CORP
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  • Abstract
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Problems solved by technology

[0006] The above measurement methods are easily affected by boreholes, surrounding rocks and intrusion zones, the resolution and measurement accuracy are not high, the detection depth is only 0.6-0.8 meters, and the layering ability is only 1 meter, which limits the scope of practical application

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  • Synthetic focusing method for excited polarized logging
  • Synthetic focusing method for excited polarized logging
  • Synthetic focusing method for excited polarized logging

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Embodiment Construction

[0019] Embodiment of the invention

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] The electrode system of the present invention has nine annular electrodes embedded in a cylindrical insulating rod. The main electrode is A 0 ,M 1 , M 1 ' and M 2 , M 2 ′ are two pairs of supervisory electrodes, and two pairs of shielding electrodes are A 1 、A 1 ' and A 2 、A 2 ’, taking the main electrode as the center, and aligning each pair of electrodes with respect to A 0 The electrodes are arranged symmetrically, and each pair of electrodes is short-circuited with each other. B is the power supply loop electrode, N is the measurement loop electrode.

[0022] The object of the present invention is achieved in the following way: no matter the deep survey or the shallow survey, the induced polarization logging is divided into two sub-fields or a plurality of sub-fields, and the ...

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Abstract

The present invention relates to a synthetic focusing method for induced polarization logging. It is characterized by that logging can be divided into two partial fields, the first partial field uses main electrode to transmit constant current, its guard electrode does not transmit current, and can record the partial field induced polarization potential on its correspondent monitoring electrode and current-interrupted secondary potential attenuation curve; the second partial field uses guard electrode to transmit constant current, and its main electrodes does not transmit current, and can fit secondary partial field potential attenuation curve to obtain secondary potential amplitude, and can make the secondary partial field potential be equivalent on the partial field induced polarization potential to obtain induced polarization potential curve when the partial field is powered on, then superimposes the electric field and monitoring electrode potential focusing and synthesizes polarization total field potential so as to obtain the focused first potential, induced polarization total field potential and secondary potential attenuation curve. Said invention can raise measurement accuracy.

Description

technical field [0001] The invention relates to a logging technology for petroleum geological exploration and metal mineral deposit exploration, in particular to a synthetic focusing method for induced polarization logging that can be used for deep logging and shallow logging. Background technique [0002] The induced polarization logging method is a relatively mature electrical logging technology currently used. Its principle is to apply a constant external electric field in the well to be logged, record the potential after power supply and power failure, and then calculate the formation conductivity and other parameters. The existing induced polarization logging methods at home and abroad only have a single electric field non-focusing method. First, a constant external electric field is applied to the sand-shale formation to generate a polarization field, that is, the deformation of the dielectric layer and the local concentration change. When After the external electric f...

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Application Information

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IPC IPC(8): G01V3/26
Inventor 曾花秀陈鹏王敬农孙宝佃何三宇方荣贵章海宁余卫东王成龙
Owner BC P INC CHINA NAT PETROLEUM CORP
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