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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, and achieve the effects of reducing near-surface interference, reducing drilling costs and high success rate

Inactive Publication Date: 2008-07-09
西安西凌地球物理技术开发有限责任公司 +1
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  • Summary
  • 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) As shown in Figure 1: the length of each row is 1.5 kilometers, and the distance between adjacent survey points is 100 meters. Each electric sensor 1 is arranged, and each electric sensor 1 is connected with the measuring instrument 3 through a coaxial cable; Determine the survey points of the endpoints of the arrangement as the reference measurement points, and arrange three parallel electrical sensors 2 at 120 degrees around the measurement points at both ends, and they are 3-5 meters apart from the endpoints.

[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 obtain the graph of multiple repeated measuremen...

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 deployed and implemented drilling of 5 wells according to the exploration results, among which 3 wells were found to be industrial oil flows, 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 relates to a natural potential continuous profile exploration method. The method comprises the following steps of : laying a plurality of sensors on each exploration point in an arrangement; measuring ground resistance Ri between adjacent exploration points, selecting one exploration point as the reference point; measuring the potential difference between each exploration point and the reference point repeatedly; laying an arrangement, wherein the exploration points on end portions of the two arrangement coincides with each other; measuring the ground resistance and the potential between the exploration points of the arrangement, and so forth; and subjecting the potential difference to denoising and superposition treatment to obtain an effective potential difference DeltUi'; calculating a corrected natural potential difference DeltUi according to the formula DeltUi=Ki*DeltUi', where Ki=(R1+R2+ ellipsis +Rn-1) / [(n-1)*Ri]; and subjecting the corrected natural potential difference DeltUi to leveling treatment to obtain desired natural electric field information. The invention can be used for detecting natural potential produced by oil-gas hydrocarbons to evaluate oil-gas possibility in trap.

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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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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