Seismic prospecting method

FIELD: seismic prospecting.

SUBSTANCE: method can be used when prospecting oil and gas fields. Method is based upon forming of random wave field (microseism) on the base of microseisms received during seismic prospecting works at profile and area observations. Wave field is formed by creating series of time fields composed by totality of routes being equally distant from explosion site for areas, which are free of recording of regular waves, and summary time fields composed by seismograms of multiple overlapping integrated by the same point of reception. Received wave fields are subject filter filtration and spectral analysis. Parts of abnormal values of low-frequency component and specific energy of the component in total random wave field is determined. Gradients of spectra are determined and maps of those parameters distributed along the area are built. If drilled holes are available, correlation links of c calculated parameters are found and those data is used in complex interpretation of seismic prospecting works of materials or for expert evaluation and specification of given before drilling recommendations for search or survey holes.

EFFECT: simplified technology.

4 dwg

 

The invention relates to seismic exploration and can be used in the exploration of oil and gas fields.

There is a method of seismic exploration, which makes it possible to predict the spatial location of fractured-cavernous reservoir zones in the thickness of the massive rocks according to standard seismic two-dimensional and three-dimensional observations (patent No. 2168187, CL G 01 V 1/00).

The method includes seismic excitation signal, the recording of seismic fields and data processing, the selection of the diffuse components of the seismic field by eliminating the regular reflected and repeated waves of determining the energy and spectral characteristics, the degree of irregularity of seismic signals scattered components and abnormal values for these parameters, the selection of fractured-cavernous reservoir zones.

The disadvantage of this method is that there is no information about the hydrodynamic processes, always flowing in fractured media.

These processes give rise to an independent field of irregular waves (seismic noise), which registration and restoration of noise sources on them are made by the method of emission tomography, which is taken as a prototype (abstracts of the Second Russian-Chinese seminar "Optimization of exploration, R is trabocchi and exploitation of oil and gas geophysical research and technology", Moscow, 2000, p.36-40, Bsmbi, A.V.Nikolayev, Abermals (oil and gas research Institute of RAS), "Methods of seismic surveys, based on the principles of emission tomography"). The method includes forming a wave field of random waves by special registration gathers on the surface, highlighting it coherent component, mapping microseismic activity environment and tomographic images seismically noisy objects.

The disadvantage of this method is the inability to use archival materials previously seismic data for the analysis of field emission waves.

The objective of the invention is to simplify the technology through the use of standard seismic data, including archival materials on the previously performed studies.

The task is solved in that in the method of seismic exploration, including the formation of the wave field of random waves, mapping microseismic activity environment, according to the invention a random wave field wave form on the basis of seismograms obtained by seismic work under profile and areal observations of reflected waves by creating a series of fields, composed of the aggregate of runs equal distances from the shot point to the areas that are free from writing regular waves, and pivot the time the data fields, composed of seismograms multiple floors, all United by one point, perform frequency filtering, isolated areas of anomalous values of energy of the low-frequency component, determine its share in the total field of microseisms, determine the amplitude-frequency spectra and their gradients in the low frequency range, build maps of the distribution of these parameters on the area if the area has drilled wells are correlation parameters calculated from the test results and use this data as an additional prognostic parameters in integrated interpretation of seismic observations on the reflected waves or for additional expert evaluation of previously issued recommendations to the drilling of a prospecting or exploration wells.

Figure 1. see field seismograms obtained by the method of multiple slabs of common depth point (CDP) with the selected intervals (1-4), free from writing regular waves, which are used to form and field analysis of random waves (microseisms).

Figure 2 - shows the installation records of microseisms on slopes equal deletions (l=const), obtained from all seismograms on the profile with the record length 1 with filter 0-15 Hz, indicating the location of exploration wells drilled(304, 73, 18).

Figure 3 shows a map of what raspredeleniya the specific energy of the low-frequency component of the microseismic field area detailed 3D works.

Figure 4 shows the graph of the mapping shown in figure 3 parameter with daily well flow rates obtained during their trials.

The method is as follows.

Form of the wave field of random waves on the basis of seismograms obtained by seismic work under profile and areal observations, by creating a series of fields, composed of the aggregate of runs equal offsets in areas free from the records of regular waves (1, 2), and a summary of the temporary fields composed of seismograms multiple floors, all United by one point, which extends the length of the recording (and analysis) of microseisms in accordance with the frequency of the surveillance system.

Perform frequency filtering of the received wave fields with obtaining low-frequency component (0-10÷0-15 Hz), determine the specific energy of this component in the overall field of random waves as the ratio of the energy of the filtered route to the energy of the full field, calculate the amplitude-frequency spectra and their gradients in the low frequency range, build maps of the distribution of these parameters on the area and give them lots of abnormally high geodynamic activity environment (figure 3).

If the study area drilled wells build diagrams of correlation with the connection parameters of the geodynamic activity with those obtained by testing the flow rate (figure 4), allocate areas of high and a low prospects, precise location and sequence of drilling exploratory wells in the process of integrated interpretation of seismic observations on the reflected waves or use this data for additional expert evaluation of previously issued recommendations to the drilling of a prospecting or exploration wells.

It is known that oil and gas deposits, being unstable thermodynamic systems are sources of high level geodynamic noise, on the basis of a study which attempts their contouring. Among elevated values geodynamic noise inherent in the oil and gas deposits, there are sources of abnormally intense signals associated with active interactions at the contact of the oil(gas) - water, with pockets of intense gidroperita that can be nepreodolimymi channels, with zones of active geodynamic interactions of the different blocks of the environment determining the zone of maximum compression and rarefaction of the control zones of increased productivity deposits.

Examples of the practical application of the method.

This method was applied to predict the contours of deposits and allocation within highly productive zones in some areas of Western Siberia, including with the installed according to the drilling of oil what onestly.

As an example, a clear separation of local zones of increased noise levels, which are SCV and 18, which gave industrial (over 60 tons/day.) tributaries when testing the productive formation SC1, figure 2 shows the nature of recording low-frequency (0-15 Hz) component of the field of random waves (microseisms) on one of the profile 2D shooting. Here is shown the bore 73, located on the border of abnormal, but poorly intensive zone, which is on the horizon unproductive, but given the influx of 5.2 t/d of the underlying, with local development and less productive horizons HUC-2-9. Such montages and graphics intensity microseisms were built on all profiles of this area and used to justify the locations for new wells.

Areal distribution of specific energy low-frequency component (0-15 Hz) random waves (microseisms) section detailed 3D works on one of the squares of the Krasnoleninsky arch of the West Siberian plate shown in figure 3. The oil content of this area established according to the drilling, but is variable in size and generally low productivity.

Figure 4 is a graph that shows a clear correlation between the location of the more productive wells with areas of increased intensity of random waves and in which mo is but to say, what industrial inflows (over 5 tons/day) can be expected in areas where the relative option geodynamic activity of more than 0.8. Based on these data was conducted expert evaluation of previously issued recommendations on drilling new exploration wells clarifying provisions 2 and canceling the drilling of one well.

Thus, the proposed method, due to the use of spatio-temporal plots of seismograms obtained by seismic work, free from the records of regular waves, allows no additional cost on a special field observations to identify and delineate areas of anomalous values geodynamic noise on the surface and use the resulting data as additional parameters in the prediction of highly productive areas of oil and gas deposits.

Method of seismic exploration, including the formation of a random wave field waves (microseisms), mapping of microseismic activity environment, characterized in that the random wave field wave form on the basis of seismograms obtained by seismic work under profile and areal observations of reflected waves by creating a series of fields, composed of the aggregate of runs equal distances from the point of explosion in areas free from the write reg is regular waves, and summary of temporary fields composed of seismograms multiple floors, all United by one point, perform frequency filtering of this field, highlighting areas of anomalous values of the low-frequency component, to determine the specific energy of this component in the overall field of random waves, determine the gradients of the spectra, build maps of the distribution of these parameters on the square, in the presence of drilled wells are correlation parameters calculated from the test results of wells drilled and use these data in an integrated interpretation of seismic studies or for peer review and Refine previously issued recommendations to the drilling of a prospecting or exploration wells.



 

Same patents:

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EFFECT: enhanced precision and reduced cost of prospecting.

4 cl, 2 dwg

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4 cl, 6 dwg

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EFFECT: higher reliability, higher precision, higher trustworthiness, higher efficiency.

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EFFECT: higher reliability, higher precision.

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3 dwg

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FIELD: seismic prospecting.

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EFFECT: improved design.

3 cl, 2 dwg

FIELD: seismic prospecting.

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EFFECT: enhanced efficiency and reduced service expenses.

8 dwg

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EFFECT: increased level of valid signal.

5dwg

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2 dwg

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EFFECT: enhanced efficiency and repetition frequency of force actions, simplified control of the amplitude and duration of the excited seismic waves.

3 dwg

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