CN100562764C - Natural potential continuous section exploration method - Google Patents
Natural potential continuous section exploration method Download PDFInfo
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- CN100562764C CN100562764C CNB200710300738XA CN200710300738A CN100562764C CN 100562764 C CN100562764 C CN 100562764C CN B200710300738X A CNB200710300738X A CN B200710300738XA CN 200710300738 A CN200710300738 A CN 200710300738A CN 100562764 C CN100562764 C CN 100562764C
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Abstract
The invention belongs to the geophysical survey field, it is a kind of natural potential continuous section exploration method, the present invention is laid in a plurality of electric transducers on each exploration point with arrangement mode, measure the stake resistance Ri between adjacent exploration point earlier, survey point as reference point with one again, repeatedly each exploration point of duplicate measurements is with respect to the potential difference (PD) between reference point, lay next the arrangement then, two arrange end exploration point overlaps, and measures stake resistance and current potential between this arrangement exploration point, and the rest may be inferred; At last the potential difference (PD) of obtaining is carried out denoising, overlap-add procedure, obtain effective potential difference (PD) Δ Ui ', again according to Δ Ui=Ki* Δ Ui ', Ki=(R1+R2+ ... + Rn-1)/[(n-1) * Ri], the spontaneous potential difference Δ Ui after obtaining proofreading and correct, through the ring adjustment, promptly obtain required natural electric field information.The present invention can be used to detect the spontaneous potential that the oil gas hydro carbons produces, and then estimates the oil-gas possibility of trap.
Description
Technical field
The present invention belongs to the geophysical exploration technology field, and particularly a kind of natural potential continuous section exploration method can be used to detect the spontaneous potential that the oil gas hydro carbons produces, and then estimates the oil-gas possibility of trap, promptly direct means as a kind of oil-gas exploration.The present invention also can be used for other electrical methods of geological problems such as reconnoitring of metal, nonmetallic minerals and the hydrology, engineering, environmental hazard and reconnoitres.
Background technology
Spontaneous potential (field) method is as a kind of geophysical exploration method of classics, in metal, nonmetal and oil-gas exploration, obtain general application always, its traditional practice is mainly the bipolar electrode gradient method: lay two electric transducers simultaneously, record the potential difference (PD) between first, second point, then with two electric transducers of moved further, record the potential difference (PD) between second, third point again, by that analogy, record the potential difference (PD) between each consecutive point, calculate the current potential of each measurement point at last by " algebraic sum ".The accumulated error of this measuring method is generally bigger, and in a closed measurement ring, resulting is not a potential curve that head and the tail overlap, and the potential curve of a dullness often, as shown in Figure 4, the current potential of its curve head and the tail differs and reaches thousands of millivolts.Obviously, the data that obtains like this will be on a precision level, and is very unfavorable to the further analysis of data.In addition, because the interference of the near surface of natural electric field phenomenon is various, as artificial difference that reaches industrial travelling powder current, soil and the variation of weather humidity, topographic relief, formation lithology or the like, and very powerful (can reach more than tens of even hundreds of millivolts).As everyone knows, the natural electric field effect that hydrocarbon-bearing pool self produces generally has only a few to tens of millivolts because there are the problems referred to above in present investigation method, so be difficult to objective, observe and extract the spontaneous potential (field) that hydrocarbon-bearing pool produces effectively.How to suppress above-mentioned said various powerful interference, reduce to survey error as much as possible, will reflect that really required natural electric field information extracts, and has also just become spontaneous potential exploration engineering problem demanding prompt solution.
Summary of the invention
Problem to be solved by this invention is: a kind of natural potential continuous section exploration method is provided, the near surface that this method can be got rid of the natural electric field phenomenon to greatest extent disturbs, reduces to survey error, required natural electric field information is extracted, for example, the natural electric field information relevant with hydrocarbon-bearing pool is extracted.
The technical scheme that addresses the above problem is: the natural potential continuous section exploration method step that is provided is as follows:
1) a plurality of electric transducers are laid on each exploration point with arrangement mode, wherein the electric transducer as the exploration point of two ends is that parallel connection is distributed in this end exploration point a plurality of electric transducers on every side;
2) measure stake resistance between each adjacent exploration point;
3) with an exploration point in above-mentioned each exploration point as the reference measurement point, measure each exploration point with respect to the potential difference (PD) between reference measurement point, preferably selected with the exploration point that is positioned at the arrangement end as the reference measurement point;
4) repeating step 3 repeatedly); The number of times of duplicate measurements requires to determine that measuring accuracy requires higher according to measuring accuracy, the number of times of duplicate measurements the more;
5) set by step 1) lay next the arrangement, wherein one or two electric transducer of this arrangements end is laid on the exploration point of an arrangement end, the exploration points coincidence of promptly adjacent two arrangement ends;
6) repeating step 2), 3) 4);
7) set by step 5), 6) repeat to arrange and lay, measure, until the exploration of finishing desired zone;
8) according to the measurement data of step 4) gained, the potential difference (PD) that each the exploration point that obtains is arranged between reference measurement point with respect to the place is carried out denoising, overlap-add procedure, obtain each exploration point with respect to the effective potential difference (PD) Δ Ui ' between this arrangement reference measurement point;
9) the effective potential difference (PD) Δ Ui ' to each exploration point of above-mentioned gained presses the following formula processing:
ΔUi＝Ki*ΔUi′
Ki=(R1+R2+ ... + Rn-1)/((n-1) * Ri) in the formula
Ki is the neutralizing factor corresponding to each exploration point, i=1,2,3 ... n-1,
R1 is the stake resistance between the 1st exploration point and the 2nd exploration point, and R2 is the stake resistance between the 2nd exploration point and the 3rd exploration point, and Rn-1 is the stake resistance between n-1 exploration point and n exploration point;
Spontaneous potential was poor after Δ Ui was the required correction of respectively surveying point;
10),, promptly obtain the natural electric field information on each exploration point of exploration area through the ring adjustment processing according to proofreading and correct back spontaneous potential difference Δ Ui.
The present invention surveys point as the reference measurement point with one in the laying of every arrangement, measure each exploration point with respect to the potential difference (PD) between reference measurement point, thereby solved a transmission and an accumulation problem of arranging internal error, this point can find out that at the closed hoop potential curve of certain basin exploration of China middle part the head and the tail of curve are near closed from the present invention that Fig. 5 provides; And the duplicate measurements technology in each arrangement observation can effectively identify the suffered near surface interference of each exploration point.
The present invention measures the stake resistance between each adjacent exploration point, and proofreaies and correct the potential difference (PD) of surveying with this, and then can suppress the influence of face of land resistivity to the exploration targets spontaneous potential.
Fig. 3 has provided the corresponding curve with stake resistance of current potential of the present invention's arrangement exploration point in certain exploratory area.As can be seen from Figure 3, in the open air under the situation, it is unusual that the variation of face of land view often forms a large amount of ' falseness ', the actual observation data is that various factors ' mixes and piles up ' in the natural electric field data, have only stake resistance is also measured, could eliminate the influence of face of land view factor, it is inappropriate that attempt utilizes the mode of indoor ' maths game ' that this factor is made compacting.When measuring potential difference (PD), stake resistance is made measurement, when data processing, carry out the correction of stake resistance, can suppress the influence of face of land view variation preferably to observational data.
According to basic physics theory, spontaneous potential U that ground surveys and stake resistance R, little electric current system I should satisfy Ohm law, and stake resistance is subjected to the influence of face of land view (vegetation, soil, weather humidity and formation lithology etc.) again, so little electric current system for same hydrocarbon-bearing pool formation, because the difference of face of land resistivity, an additional current potential that produces because of change in resistance will superpose on the basis of its current potential.The present invention adopts normalization to proofread and correct and suppresses this additional current potential, and its thinking is: since current potential U is directly proportional with resistance R, promptly U ∝ R designs a neutralizing factor K, makes U ∝ 1/R.
For further compacting interference, eliminate measuring error, when electric transducer is laid in each exploration point by arrangement, be that parallel connection is distributed in a plurality of electric transducers around this end exploration point wherein as the electric transducer of the exploration point of two ends, can form ' equipotential ' environment in the certain limit around this end exploration point like this, and then part is suppressed possible random disturbance.
A plurality of electric transducers that parallel connection is distributed in around this end exploration point can be 2-5, but preferably 3, they are mutually 120 degree and distribute.
Compare with existing natural current potential (field) method, the present invention because taked above-mentioned arrangement to lay to measure, repeatedly duplicate measurements and earth point resistance measurement and treatment measures, the near surface that greatly reduces the natural electric field phenomenon disturbs, and the spontaneous potential that is extracted (field) information relatively meets the actual conditions of exploration targets.Experiment shows that the success ratio that the data of utilizing the inventive method to obtain is drilled is higher, thereby has reduced drilling cost.
Description of drawings
Fig. 1 is the present invention lays electric transducer by arrangement mode a synoptic diagram.
Fig. 2 is the curve map of exploration point of the present invention with respect to the repeatedly duplicate measurements of potential difference (PD) between reference measurement point.
Fig. 3 is the corresponding curve map with stake resistance of current potential of the present invention's arrangement exploration point in certain exploratory area.
Fig. 4 is China basin closed hoop potential curve figure that adopts traditional bipolar electrode gradient method to obtain.
Fig. 5 is the closed hoop potential curve figure of the present invention in certain the basin exploration of China middle part.
Embodiment
Embodiment one
With method of the present invention reservoir exploration is carried out in the east China exploratory area:
1) as shown in Figure 1: by every row's spread length is that distance is 100 meters each electric transducers 1 of laying between 1.5 kms, the adjacent exploration point, and each electric transducer 1 is by linking with core cable and measuring instrument 3; The exploration point of setting this arrangement end points is respectively laid the electric transducer 2 of three parallel connections by 120 degree orientation as the reference measurement point around the measurement point of two ends, they and end points are at a distance of 3-5 rice.
2) the stake resistance Ri between above-mentioned each the adjacent exploration point of measurement.
3) measure each exploration point with respect to the potential difference (PD) between reference measurement point, and multiple scanning is measured 80 times, can obtain the curve map of each exploration point with respect to the repeatedly duplicate measurements of potential difference (PD) between reference measurement point, Fig. 2 has provided an exploration point with respect to the time dependent curve of potential difference (PD) between reference measurement point.As can be seen from Figure 2, A in the time period this spontaneous potential take place than great fluctuation process, illustrate to exist bigger near surface to disturb in this time period, should be rejected.
4) lay next and arrange, and make the end points of two arrangements overlap repeating step 2), 3), until the measurement of finishing survey area.
5) data processing: each exploration point is carried out denoising, overlap-add procedure with respect to the potential difference (PD) between reference measurement point (for example can adopt a kind of denoising mode commonly used at present: the mode of the time series section that the selection interference ratio is less; Can adopt a kind of stacked system commonly used at present: average for the data after the denoising), obtain each exploration point with respect to the effective potential difference (PD) Δ Ui ' between this arrangement reference measurement point; By formula Δ Ui=Ki* Δ Ui ' proofreaies and correct effective potential difference (PD) Δ Ui ' then, Ki=(R1+R2+ in the formula ... + Rn-1)/((n-1) * Ri); According to the spontaneous potential difference Δ Ui after proofreading and correct, encircle adjustment processing (for example the mis-tie mean allocation being surveyed on the point to each), can obtain having in the exploration area hydrocarbon-bearing pool distribution situation of extraction value.
Embodiment two
With the exploration that method of the present invention is carried out the east China exploratory area, the probing of 13 mouthfuls of wells is disposed and implemented in the oil field according to exploring achievement, and wherein the result is 8 that oil is flowed in industry, and success ratio is 62%.
Embodiment three
With the exploration that method of the present invention is carried out the east China exploratory area, the probing of 5 mouthfuls of wells is disposed and implemented in the oil field according to exploring achievement, and wherein the result is 3 that oil is flowed in industry, and success ratio is 60%.
As seen above example utilizes method provided by the present invention that the hydrocarbon-bearing pool distribution situation is estimated, and the success ratio of its probing is higher.
Claims (4)
1, natural potential continuous section exploration method, its step is as follows:
1) a plurality of electric transducers are laid on each exploration point with arrangement mode, wherein the electric transducer as the exploration point of two ends is that parallel connection is distributed in this end exploration point a plurality of electric transducers on every side;
2) measure stake resistance between each adjacent exploration point;
3) with an exploration point in above-mentioned each exploration point as the reference measurement point, measure each exploration point with respect to the potential difference (PD) between reference measurement point;
4) repeating step 3 repeatedly);
5) set by step 1) lay next the arrangement, wherein one or two electric transducer of this arrangements end is laid on the exploration point of an arrangement end, the exploration points coincidence of promptly adjacent two arrangement ends;
6) repeating step 2), 3), 4);
7) set by step 5), 6) repeat to arrange and lay, measure, until the exploration of finishing desired zone;
8) according to the measurement data of step 4) gained, the potential difference (PD) that each the exploration point that obtains is arranged between reference measurement point with respect to the place is carried out denoising, overlap-add procedure, obtain each exploration point with respect to the effective potential difference (PD) Δ Ui ' between this arrangement reference measurement point;
9) the effective potential difference (PD) Δ Ui ' to each exploration point of above-mentioned gained presses the following formula processing:
ΔUi＝Ki*ΔUi′
Ki=(R1+R2+ ... + Rn-1)/((n-1) * Ri) in the formula
Ki is the neutralizing factor corresponding to each exploration point, i=1,2,3 ... n-1,
R1 is the stake resistance between the 1st exploration point and the 2nd exploration point, and R2 is the stake resistance between the 2nd exploration point and the 3rd exploration point, and Rn-1 is the stake resistance between n exploration point and n-1 exploration point;
Spontaneous potential was poor after Δ Ui was the required correction of respectively surveying point;
10) according to proofreading and correct back spontaneous potential difference Δ Ui, through the ring adjustment processing, promptly obtain the spontaneous potential data on each exploration point of exploration area, promptly obtain required natural electric field information.
2, method of exploration according to claim 1 is characterized in that in step 3) with the exploration point that is positioned at this arrangement end as the reference measurement point.
3, method of exploration according to claim 2 is characterized in that parallel connection is distributed in this end exploration point a plurality of electric transducers on every side and has 2-5.
4, method of exploration according to claim 3 is characterized in that parallel connection is distributed in this end exploration point a plurality of electric transducers on every side and has 3, and they are mutually 120 degree and distribute.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710463B (en) * | 2009-12-21 | 2011-04-20 | 吉林大学 | Experimental method for simulating direct current method indoors through plasticine models |
| CN106383363A (en) * | 2016-08-26 | 2017-02-08 | 中铁第四勘察设计院集团有限公司 | Geological exploration method based on two-dimensional charging method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950034B (en) * | 2010-08-16 | 2011-11-09 | 中国石油天然气股份有限公司 | Natural potential curve baseline drift correcting method for seismic inversion |
| CN112304274A (en) * | 2020-09-11 | 2021-02-02 | 雅砻江流域水电开发有限公司 | Core wall dam settlement monitoring method based on array type displacement meter |
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2007
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Non-Patent Citations (2)
| Title |
|---|
| 油气藏自然电位勘探原理及在开发中的应用. 王君恒，邓明胜等.石油勘探与开发，第27卷第3期. 2000 |
| 油气藏自然电位勘探原理及在开发中的应用. 王君恒，邓明胜等.石油勘探与开发，第27卷第3期. 2000 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710463B (en) * | 2009-12-21 | 2011-04-20 | 吉林大学 | Experimental method for simulating direct current method indoors through plasticine models |
| CN106383363A (en) * | 2016-08-26 | 2017-02-08 | 中铁第四勘察设计院集团有限公司 | Geological exploration method based on two-dimensional charging method |
| CN106383363B (en) * | 2016-08-26 | 2019-07-09 | 中铁第四勘察设计院集团有限公司 | A kind of geologic prospecting method based on two-dimentional mise-a-la-masse method |
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