The geophysical method of detecting areas of abnormal exit to the surface of volatile gases (and its variants)

 

Use: when searching for and control the exploitation of oil and gas fields, the detection zones of activation of the contemporary movements of the earth's crust, deep geometrizing processes of natural and anthropogenic origin, the mapping from the surface of injection and sampling fluid in the geological environment. Essence: in the first scenario take samples from the surface layer at selected points of the study area. Determined in the samples the concentration of radon, and in each selected point of the study area determine the intensity of the atmospheric electric field (AEP). Allocate plots with the results of the measured parameters, different from the background. Make a judgment about the presence of anomalous outcrops of volatile gases at selected sites on the coincidence of extreme strength values of the atmospheric electric field and concentration of radon. The second option take samples from the surface layer at selected points of the study area and define them in concentration of at least one volatile gas components and concentrations of radon. Make a judgment about the presence of anomalous outcrops of volatile gases is concentratie radon and concentration of at least one volatile gas components. Effect: increase the efficiency of search. 2 S. and 3 C.p. f-crystals, 6 ill.

The invention relates to the field of Geophysics and can be used for geophysical detection of anomalous areas of the surface of the volatile gases from the gas storage and oil and gas, search and control the exploitation of oil and gas fields, the detection zones of activation of the contemporary movements of the earth's crust, deep geometrizing processes of natural and anthropogenic origin, the mapping from the surface of injection and sampling fluid in the geological environment.

There is a method of determining razortooth anomalies, including the measurement of radon and mercury on the soil surface and at a height of not less than 1 meter from the surface of the Earth, and the judgment of the presence razortooth anomalies (see and.with. The USSR 1402999, CL G 01 V 9/00, 1988).

The disadvantage of this method is the low reliability of determining razortooth anomalies.

There is a method of geophysical prospecting comprising selecting points in the study area, sampling of air in the atmospheric surface layer, the measurement of physico-chemical characteristics of the environment and the determination of statistically significant an is there intelligence due to the averaging effect of turbulent mixing of the surface layer of the atmosphere, a dominant presence in the sample atmospheric air, the impossibility of separating the contributions of deep and shallow sub-vertical flow of soil air, which is especially important if necessary, highlight zones signs of gas.

Closest to the proposed invention is a method of exploration, including the sampling of near-surface layer at selected points of the study area and define them in the concentration of volatile gas components. (see and.with. The USSR 996974, CL G 01 V 9/00, 1983).

However, this method has low reliability of search, because it can not distinguish the degree of participation of the deep and shallow sub-vertical flow, which is especially important when working at the emergency signs of gas - Grigorovich above the hydrocarbon accumulation; moreover, if necessary, to achieve high resolution, deprived of efficiency, because it requires the subsequent laboratory analysis of samples of gas.

The proposed invention solves the problem of increasing the efficiency of the search. The technical result is to increase the accuracy and reliability of detecting areas of abnormal exit on the surface of the volatile gases and the efficiency of obtaining the result.

Technical the exit on the surface of the effluent gases, includes a sampling of the near-surface layer at selected points of the investigated area definition in each selected point on the tension of the atmospheric electric field determination in the samples of the radon concentration, the allocation of plots with the results of the measured parameters, different from the background, and making judgments about the presence of anomalous outcrops of volatile gases at selected sites on the coincidence of extreme strength values of the atmospheric electric field and concentration of radon.

About the presence of anomalous outcrops of volatile gases at selected sites is judged if the inequalitywhere Ee- the extreme value of the intensity of the atmospheric electric field, V/m; CRn.e- extreme value of radon activity concentration, Bq/l; Fcf. von- the average background intensity of the atmospheric electric field, V/m; CRn.background- the average background radon concentration, Bq/l;- the standard deviation of the ratio of background-strength values of the atmospheric electric field to the background concentrations of radon (l)/(m

About the presence of anomalous outcrops of volatile gases at selected sites is judged if the inequalitywhere Ee- the extreme value of the intensity of the atmospheric electric field, V/m; CRn.e- extreme value of radon activity concentration, Bq/l;
WithL., e- the extreme value of the concentration of volatile components of the gas (gases), mg/l;
Ecf. von- the average background intensity of the atmospheric electric field, V/m,
WithRn.background- the average value of the background is his gas, mg/l;
- the standard deviation of the ratio of background-strength values of the atmospheric electric field to the background values of radon concentrations and background concentrations of volatile components of the gas (Inl)/[(mBq)(mg/l)].

Volatile components of gas selected from a number of: hydrogen, nitrogen, helium, carbon dioxide.

Distinctive features of the proposed method according to the second variant are defined in each selected point of the investigated territory tension atmospheric electric field (AEP), the definition in the samples concentrations of at least one volatile components of the gas and radon, the allocation of plots with the results of the measured parameters different from the background and making judgments about the presence of anomalous outcrops of volatile gases at selected sites on the coincidence of extreme strength values of the atmospheric electric field, the radon concentration and the concentration of at least one volatile gas components.

This allows to improve the accuracy and reliability in detecting areas of abnormal exit on the surface of the volatile gases: glubinnye in prizemnog atmosphere, ionization which, and therefore the atmospheric electric field determines transported in prizemnog atmosphere of volatile gases radon.

If necessary, it is possible to further increase the accuracy and reliability of allotments abnormal exit on the surface of the volatile gases. For this purpose it is necessary to use the measurement results of 2 or more volatile gases.

Entered inequality relations with two and three parameters allow you to select the areas where the measured value is different from the background - the accuracy and reliability increases due to the overlap areas of extreme values relationship for two and three parameters. Moreover, the difference of the amplitudes at the points with extreme and background values in the input relations will grow with the increase in the number of parameters used in the relationship.

The present invention is illustrated in the drawings, which depict: Fig. 1 - strength variation of the atmospheric electric field and concentration of radon (in the first embodiment), Fig.2 - change the relationship of tension atmospheric electric field to the concentration of radon (in the first embodiment), Fig.3 - change the tension of atmospheric ELEKTRIChESKOGO field and concentration of volatile components hydrogen gas (the second option), in Fig.5 - change the relationship of tension atmospheric electric field to radon (second version), in Fig.6 - change the relationship of tension atmospheric electric field to the radon concentration and the concentration of volatile components of a gas - hydrogen (the second option).

Offered by the first embodiment method of geophysical detection areas of the surface of volatile gases is carried out as follows.

Take samples from the surface layer at selected points of the study area. Determined in the samples the concentration of radon, and in each selected point of the study area determine the intensity of the atmospheric electric field (AEP). Allocate plots with the results of the measured parameters, different from the background. Make a judgment about the presence of anomalous outcrops of volatile gases at selected sites on the coincidence of extreme strength values of the atmospheric electric field and concentration of radon. About the presence of anomalous outcrops of volatile gases at selected sites is judged if the inequality

where Eeextreme tension and the/sub> - the average background intensity of the atmospheric electric field, V/m;
WithRn.backgroundthe average radon concentration, Bq/l;
- the standard deviation of the ratio of background-strength values of the atmospheric electric field to the background concentrations of radon (l)/(mBq).

Example 1
The study was subjected to the area above the oil reservoir with a total area of ~ 18 km2. On-site on-line with a total length of 2,800 m were selected 29 of the measuring points in increments of 100 meters

In each selected point of the study area was selected sample of soil gas from the subsurface layer of holes with a depth of 0.6 m, which were promptly measured radon concentrations. The measurements were performed using a commercial radiometer DSA-01. To reduce errors of measurement, each sample of analizirovali 4 times in the working chamber of the measuring instrument.

Simultaneously linear profile, connecting all the selected point of the investigated area was measured intensity of the atmospheric electric field. The measurements were performed with the use of sensor "Field-2" installed on a motor sreddy selected point study area were averaged over four consecutive measurements. Average results of the measurements of the two parameters is shown in Fig.1.

From the analysis of the changes in the tension of the atmospheric electric field and the concentration of radon in Fig.1, the data on a plot measuring points 3-8 were recognized as different from the background. The selection may include one or more points with the results of the measured parameters, different from the background. In the case of coverage plot multiple points, determine the average value of the measured parameters.

The average values of the parameters Ee=113,3/mRn.e=3.7 Bq/l, the ratio of Ee/SRn.e=31,8 (l)/(mBq) were considered extreme.

Measurements at sites 1-2 and 9-29 were considered background. The average background value of Ebackground=231,4/mRn.background=2.8 Bq/l, the ratio of Ebackground/SRn.background= 83.8 (l)/(mBC), the standard deviation of the relations= 10,5 (l)/(mBq).(l)/(mBq), which is more(l)/(m

Offer according to the second variant of the method of geophysical detection areas of the surface of volatile gases is carried out as follows.

Take samples from the surface layer at selected points of the study area and define them in concentration of at least one volatile gas components and concentrations of radon. In each selected point of the study area determine the intensity of the atmospheric electric field. Allocate plots with the results of the measured parameters, different from the background. Make a judgment about the presence of anomalous outcrops of volatile gases at selected sites on the coincidence of extreme strength values of the atmospheric electric field, the radon concentration and the concentration of at least one volatile gas components. About the presence of anomalous outcrops of volatile gases at selected sites is judged if the inequality

where Eeextreme tension of the atmospheric electric field, V/m;
WithRn.e- extreme radon concentration, Bq/l;
WithL., ethe extreme concentration of Comala, V/m;
WithRn.background- the average background radon concentration, Bq/l;
WithL. H. vonthe average background concentration of volatile components of the gas, mg/l;
- the standard deviation of the ratio of background-strength values of the atmospheric electric field to the background values of radon concentrations and background concentrations of volatile components of the gas (Inl)/[(mBq)(mg/l)].

Volatile components of gas selected from a number of: hydrogen, nitrogen, helium, carbon dioxide.

Example 2
The study was subjected to the territory of underground gas storage facilities with a total area of ~25 km2. On-site on-line with a total length of 1300 m were selected 27 measuring points in increments of 50 meters

In each selected point of the study area was selected sample of soil gas from the subsurface layer of holes with a depth of 0.6 m, which are sequentially pumped into a working camera sensors radon and hydrogen. The radon concentration in the sample was measured using a commercial radiometer DSA-01. To reduce errors of measurement, each sample of analizirovali 4 times in the working chamber of the measuring instrument. The concentration of the components years the ODA unit SIV-01 was analyzed 2 samples.

Linear profile, connecting all points selected study area was measured intensity of the atmospheric electric field. The measurements were performed with the use of sensor "Field-2" installed on the vehicle. To improve the reliability of the results of measurements of the atmospheric electric field intensity at each measurement point was calculated from the results of four consecutive observations.

The average strength measurement of atmospheric electric field and concentration of radon 27 measuring points shown in Fig. 3; the average strength measurement of atmospheric electric field and concentration of hydrogen in Fig.4.

From the analysis of the variations of the tension of the atmospheric electric field, the volume concentration of radon and hydrogen - Fig.3, 4, data on a plot measuring points 19-21 were considered extreme. Extreme values of bulk hydrogen concentration was observed at the measurement points 18-20.

The transition to the relations Ebackground/SRn.backgroundand Ebackground/(CRn.backgroundWithH. von) - Fig.5 and 6, allows to unambiguously attributed the anomalous area to the measuring points 19-20. Background relations Rav is>n.backgroundWithN. background)= 3,6+/of-2.1 (l)/(mBq %); extreme relations Ee/SRn.e=79,8 (l)/(mBq) and Ee/(CRn.eWithN. e)= 19,9 (l)/(mBq %).(l)/(mBq), which is less extreme values relationships(l)/(mBq).(l)/[(mBq)(mg/l)], which is less extreme values relationships(l)/[(mBq)(mg/l)].

The highlighted area is abnormal exit on the surface of the volatile gases. Reason is a small sub-vertical flux of methane and its homologues in the zone of increased fracturing in mesocricetus the field of underground gas storage.

The present invention improves the accuracy and reliability of the geophysical detection of anomalous areas of the surface of the volatile gas is I, measurements which are made from a moving vehicle - speed up to 20-30 km/h and depends only on the road surface, is dramatically improves the performance of the work. The intensity of the atmospheric electric field effective to use primarily as reconnaissance option that allow you to narrow your subject study areas.

Check strength measurement of atmospheric electric field is carried out continuously, eliminating the possibility of missing the plot anomalous outcrops of volatile gases. Direct recording on PC, even with subsequent manual introduction to data measurement of gas parameters, allows to get the final results promptly, on-site fieldwork. The final result in real time increases the efficiency of the complex, especially when working in emergency situations when spontaneous signs of gas (the griffins) on the territories of underground gas storage facilities and fields, leaks in gas pipelines, etc.

The complex atmospheric-electric and gas observations for geophysical detection of anomalous areas in the STV. Mobility and autonomy - all measuring instruments are battery powered, including from on-Board vehicle network, ensures quick transfer of complex object of research, trouble-free operation even in remote areas.


Claims

1. The geophysical method of detecting areas of abnormal exit on the surface of the volatile gases, including sampling of the near-surface layer at selected points of the study area and determining the concentration, characterized in that each selected point of the study area determine the intensity of the atmospheric electric field, and in the samples to determine the concentration of radon, allocate plots with the results of the measured parameters, different from the background, and make a judgment about the presence of anomalous outcrops of volatile gases at selected sites on the coincidence of extreme strength values of the atmospheric electric field and concentration of radon.

2. The method according to p. 1, characterized in that the presence of abnormal exit on the surface of the volatile gases at selected sites is judged if the inequality

Ecf. von- the average background intensity of the atmospheric electric field, V/m;

CRn.background- the average background radon concentration, Bq/l;

- the standard deviation of the ratio of background-strength values of the atmospheric electric field to the background concentrations of radon (l)/(m BC).

3. The geophysical method of detecting areas of abnormal exit on the surface of the volatile gases, including sampling of the near-surface layer at selected points of the study area and determining their concentration, at least one volatile gas components, characterized in that each selected point of the study area determine the intensity of the atmospheric electric field, and in the samples additionally determine radon concentrations, produce plots with the results of the measured parameters, different from the background, and make a judgment about the presence of anomalous outcrops of volatile gases at selected sites on the coincidence of extreme strength values of the atmospheric electric field, the radon concentration and the concentration of at least one volatile gas components.

4. The method according to p. 3, distinguish what Anenii inequality

or

where Eeextreme tension of the atmospheric electric field, V/m;

WithRn.e- extreme radon concentration, Bq/l;

WithL., ethe extreme concentration of the volatile components of the gas, mg/l;

Ecf. von- the average background intensity of the atmospheric electric field, V/m;

WithRn.background- the average background radon concentration, Bq/l;

WithL. H. vonthe average background concentration of volatile components of the gas, mg/l;

- the standard deviation of the ratio of background-strength values of the atmospheric electric field to the background values of radon concentrations and background concentrations of volatile components of the gas, l/m Bq mg/l;

5. The method according to p. 3 or 4, characterized in that the volatile gas components selected from a number of: hydrogen, nitrogen, helium, carbon dioxide.

 

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