CN111158048B - Analysis method for improving reservoir prediction precision through seismic waveform envelope interpretation - Google Patents
Analysis method for improving reservoir prediction precision through seismic waveform envelope interpretation Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/30—Analysis
- G01V1/306—Analysis for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles
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- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/30—Analysis
- G01V1/307—Analysis for determining seismic attributes, e.g. amplitude, instantaneous phase or frequency, reflection strength or polarity
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- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
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Abstract
The invention provides an analysis method for improving reservoir prediction precision by seismic waveform envelope interpretation, which comprises the following steps: 1) Calibrating a seismic waveform main lobe corresponding to a research target interval on a seismic reflection waveform section by finely synthesizing seismic record calibration and seismic phase 90-degree conversion by using seismic data interpretation software; 2) Defining an interpretation horizon top layer and an interpretation bottom layer, respectively carrying out horizon tracking interpretation along the top and bottom of a seismic waveform main lobe corresponding to a target layer, and interpreting density 2x2; 3) Explaining a time window between the top layer and the bottom layer of the horizon to extract a time window for seismic waveform attributes and determining the time window as a non-isochronous optimal window for waveform seismic attribute extraction analysis; 4) Extracting and analyzing the arc length, the deflection and the torsion of the earthquake waveform in the time window in the non-isochronous optimal window, drawing an attribute plane diagram and carrying out reservoir prediction; the prediction precision is higher, the method is closer to the actual geological reality reflected by the actual target interval, and better foundation geological basis can be provided for petroleum exploration decision-making.
Description
Technical Field
The invention relates to the technical field of oil exploration, in particular to an analysis method for improving reservoir prediction precision through seismic waveform envelope interpretation.
Background
The reservoir prediction is carried out by utilizing the seismic waveform attribute extraction, and the method is widely applied to oil exploration and development. The basic principles of seismic stratigraphy assume that the event of a reflected wave on a seismic section has the meaning of a geologic time interface. The reservoir prediction by using the seismic waveform attribute must give an attribute analysis time window, and the conventional attribute analysis time window is determined by firstly tracing and explaining a seismic horizon along the seismic waveform peak homophase axis, then respectively drifting upwards and downwards for a certain time along the horizon, and using the time window to perform the seismic waveform attribute analysis. However, the seismic waveform information in the time window cannot truly reflect the real information of the target layer of the research, and often contains seismic waveform information of a non-target layer, or the seismic waveform information of the target layer is not contained in the analysis time window because the definition of the time window is not proper, so that the reservoir prediction precision by utilizing the seismic waveform attribute is influenced; and an 'isochronous window' generated by the isochronous drift along the layer is used for seismic waveform attribute prediction, the analysis time window is not set accurately, and non-target layer seismic waveform attribute information is contained in the analysis window.
Disclosure of Invention
In view of the technical deficiencies, the invention aims to provide an analysis method for improving the reservoir prediction precision by seismic waveform envelope interpretation, which carries out 'seismic waveform envelope interpretation' on seismic waveform information reflecting a target interval, determines an optimal time window reflecting the seismic waveform information of the target interval to the maximum extent, is more accurate than a time window which is drifted up and down along the interval by conventional interpretation, has higher reservoir prediction precision by using the method, is closer to the geological reality reflected by the actual target interval, and can provide better foundation geological basis for petroleum exploration decision.
In order to solve the technical problems, the invention adopts the following technical scheme:
an analysis method for improving reservoir prediction accuracy by seismic waveform envelope interpretation, which utilizes a computer provided with seismic data interpretation software to perform seismic waveform analysis, and is characterized by comprising the following steps:
1) Calibrating a seismic waveform main lobe corresponding to a research target interval on a seismic reflection waveform section by finely synthesizing seismic record calibration and seismic phase 90-degree conversion by using seismic data interpretation software;
2) Defining an interpretation horizon top layer and an interpretation bottom layer, respectively performing horizon tracking interpretation along the top and bottom of a main lobe of a seismic waveform corresponding to a target layer, interpreting density 2x2, and performing 1x1 interpolation after the interpretation is completed;
3) Explaining a time window between the top layer and the bottom layer of the horizon, extracting the time window for seismic waveform attributes, and determining the time window as a non-isochronous optimal window for waveform seismic attribute extraction analysis;
4) And extracting and analyzing the arc length, the deflection and the torsion of the earthquake waveform in the time window in the non-isochronous optimal window, drawing an attribute plane diagram and carrying out reservoir prediction.
The invention has the beneficial effects that: the invention carries out 'seismic waveform enveloping interpretation' on the seismic waveform information reflecting the target interval, determines the optimal time window reflecting the seismic waveform information of the target interval to the maximum extent, is more accurate than the time window which is opened by the conventional interpretation along the up-and-down drift of the layer, has higher reservoir prediction precision by utilizing the invention, is more close to the geological reality reflected by the actual target interval, and can provide better foundation geological basis for petroleum exploration decision.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart of an analysis method for improving reservoir prediction accuracy through seismic waveform envelope interpretation according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an analysis method for improving reservoir prediction accuracy by seismic waveform envelope interpretation utilizes a computer installed with seismic data interpretation software to perform seismic waveform analysis, and comprises the following steps:
1) Calibrating a seismic waveform main lobe corresponding to a research target interval on a seismic reflection waveform section by finely synthesizing seismic record calibration and seismic phase 90-degree conversion by using seismic data interpretation software;
2) Defining an interpretation horizon top layer and an interpretation bottom layer, respectively performing horizon tracking interpretation along the top and bottom of a main lobe of a seismic waveform corresponding to a target layer, interpreting density 2x2, and performing 1x1 interpolation after the interpretation is completed;
3) Explaining a time window between the top layer and the bottom layer of the horizon, extracting the time window for seismic waveform attributes, and determining the time window as a non-isochronous optimal window for waveform seismic attribute extraction analysis;
4) And extracting and analyzing the arc length, the deflection and the torsion of the earthquake waveform in the time window in the non-isochronous optimal window, drawing an attribute plane diagram and carrying out reservoir prediction.
When the seismic interpretation data processing method is used, firstly, the obtained original seismic data (sgy standard data), well drilling and logging curve data, well drilling and well deviation data and well position coordinate data are sorted and standardized, and a seismic interpretation work area is established; determining a target layer through stratum division and comparison, synthesizing a seismic record manufacturing module by using software, manufacturing a fine synthetic seismic record to carry out the corresponding relation of the target layer section and a seismic reflection waveform in-phase axis, corresponding the target layer (a single sand body or a sand layer group combination) to a seismic reflection main lobe through 90-degree phase conversion, and synthesizing seismic record manufacturing and 90-degree phase conversion.
Secondly, defining an interpretation horizon top layer (top) and an interpretation bottom layer (bot), and respectively carrying out horizon tracking interpretation along the top and bottom of the seismic waveform main lobe corresponding to the target layer, wherein the interpretation density is 2x2, and 1x1 is preferred. If the interpretation is 2x2, 1x1 interpolation is performed after the interpretation is finished.
And after the top layer (top) and the bottom layer (bot) are interpreted, the time window between the two layers is the 'non-isochronous optimal window' of the waveform seismic attribute extraction analysis through the horizon interpolation calculation. Compared with an 'isochronous window' obtained by shifting up and down for a certain millisecond number after the homophase axis tracking of a conventional peak, the 'non-isochronous optimal window' can completely contain the seismic information corresponding to the target interval in an analysis window.
And finally, extracting and analyzing seismic waveform arc length, deflection and torsion seismic attributes in the time window by utilizing a software corresponding attribute extraction module in the non-isochronous optimal window, drawing a corresponding attribute plane diagram, and developing reservoir prediction.
The invention carries out 'seismic waveform enveloping interpretation' on the seismic waveform information reflecting the target interval, determines the optimal time window reflecting the seismic waveform information of the target interval to the maximum extent, is more accurate than the time window which is opened by the conventional interpretation along the up-and-down drift of the layer, has higher reservoir prediction precision by utilizing the invention, is more close to the geological reality reflected by the actual target interval, and can provide better foundation geological basis for petroleum exploration decision.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (1)
1. An analysis method for improving reservoir prediction accuracy by seismic waveform envelope interpretation, which utilizes a computer provided with seismic data interpretation software to perform seismic waveform analysis, and is characterized by comprising the following steps:
1) Arranging and standardizing the obtained original seismic data volume, well drilling and logging curve data, well drilling well deviation data and well position coordinate data, establishing an earthquake interpretation work area, determining a target layer through stratum division and comparison, synthesizing a seismic record manufacturing module by using software, manufacturing a fine synthetic seismic record, carrying out the same-phase axis corresponding relation between a target layer and a seismic reflection waveform, enabling the target layer, namely a single sand body or sand layer group combination to correspond to a seismic reflection main lobe through 90-degree phase conversion, manufacturing the synthetic seismic record and carrying out 90-degree phase conversion, and calibrating the seismic waveform main lobe corresponding to the target layer to be researched on a seismic reflection waveform section;
2) Defining an interpretation horizon top layer and an interpretation bottom layer, respectively carrying out horizon tracking interpretation along the top and bottom of a seismic waveform main lobe corresponding to a target layer, interpreting density 2x2, and carrying out 1x1 interpolation after the interpretation is finished;
3) Explaining a time window between the top layer and the bottom layer of the horizon to extract a time window for seismic waveform attributes and determining the time window as a non-isochronous optimal window for waveform seismic attribute extraction analysis;
4) And extracting and analyzing the arc length, the deflection and the torsion of the earthquake waveform in the time window in the non-isochronous optimal window, drawing an attribute plane diagram and carrying out reservoir prediction.
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