Natural potential continuous section exploration method

A technology of natural potential and profile, applied in the field of geophysical exploration, can solve problems such as difficult observation and extraction of natural potential, achieve the effects of reducing near-surface interference, high success rate, and reducing drilling costs

Inactive Publication Date: 2009-11-25
西安西凌地球物理技术开发有限责任公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, the natural electric field effect generated by the oil and gas reservoir itself is generally only a few to tens of millivolts. Due to the above-mentioned problems in the current survey methods, it is difficult to objectively and effectively observe and extract the natural electric potential (field) generated by the oil and gas reservoir.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Use the method of the present invention to carry out oil and gas reservoir exploration to a certain exploration area in eastern my country:

[0034] 1) if figure 1 As shown: Each electric sensor 1 is laid out according to the arrangement length of each row is 1.5 kilometers, and the distance between adjacent survey points is 100 meters. Each electric sensor 1 is connected with the measuring instrument 3 through a coaxial cable; The survey point is used as a reference measurement point, and three parallel electrical sensors 2 are respectively arranged at 120 degrees around the measurement points at both ends, and they are 3-5 meters away from the end points.

[0035] 2) Measure the grounding resistance Ri between the above-mentioned adjacent survey points.

[0036] 3) Measure the potential difference between each survey point relative to the reference measurement point, and repeat the scanning measurement 80 times, and the graph of multiple repeated measurements of the...

Embodiment 2

[0040] Using the method of the present invention to survey a prospecting area in eastern my country, the oil field has deployed and implemented drilling of 13 wells according to the exploration results, among which the results are 8 industrial oil flows, with a success rate of 62%.

Embodiment 3

[0042] Using the method of the present invention to survey a prospecting area in eastern my country, the oil field has deployed and implemented drilling of 5 wells according to the exploration results, among which the results are 3 industrial oil wells, with a success rate of 60%.

[0043]It can be seen from the above examples that the success rate of drilling is relatively high when the method provided by the present invention is used to evaluate the distribution of oil and gas reservoirs.

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Abstract

The invention belongs to the field of geophysical exploration, and is a natural potential continuous profile exploration method. The invention arranges a plurality of electrical sensors on each survey point in an arrangement, first measures the grounding resistance Ri between adjacent survey points, and then uses A survey point is used as a reference point, and the potential difference between each survey point relative to the reference point is repeatedly measured, and then the next arrangement is laid out, and the survey points at the ends of the two arrangements coincide, and the grounding resistance and potential between the survey points of the arrangement are measured. By analogy; finally, denoise and superimpose the obtained potential difference to obtain the effective potential difference ΔUi′, and then according to ΔUi=Ki*ΔUi′, Ki=(R1+R2+…+Rn-1) / [(n-1 )*Ri], the corrected natural potential difference ΔUi is obtained, and after ring adjustment, the required natural electric field information is obtained. The invention can be used to detect the natural potential generated by oil and gas hydrocarbons, and then evaluate the oil and gas of traps.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, in particular to a method for spontaneous potential continuous profile exploration, which can be used to detect the natural potential generated by oil and gas hydrocarbons, and then evaluate the oil and gas of traps, that is, directly as a kind of oil and gas exploration method. s method. The invention can also be used for prospecting of metal and non-metallic minerals and other electrical prospecting for geological problems such as hydrology, engineering and environmental disasters. Background technique [0002] As a classic geophysical exploration method, the spontaneous potential (field) method has been widely used in metal, non-metal and oil and gas exploration. Get the potential difference between the first and second points, then move the two electrical sensors synchronously, and then measure the potential difference between the second and third points, and so on, measure t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/06
Inventor 杨高印
Owner 西安西凌地球物理技术开发有限责任公司
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