CN111736216A - Oil-water interface seismic horizon determination method based on earthquake - Google Patents
Oil-water interface seismic horizon determination method based on earthquake Download PDFInfo
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- CN111736216A CN111736216A CN202010448539.9A CN202010448539A CN111736216A CN 111736216 A CN111736216 A CN 111736216A CN 202010448539 A CN202010448539 A CN 202010448539A CN 111736216 A CN111736216 A CN 111736216A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000011160 research Methods 0.000 claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
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- 238000004364 calculation method Methods 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 4
- 238000005070 sampling Methods 0.000 description 7
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- 238000012935 Averaging Methods 0.000 description 2
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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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- 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
- G01V1/301—Analysis for determining seismic cross-sections or geostructures
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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
- G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
- G01V1/44—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging using generators and receivers in the same well
- G01V1/48—Processing data
- G01V1/50—Analysing data
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Abstract
The invention provides an oil-water interface seismic horizon determination method based on earthquake, which comprises the following steps: loading geological data and inverting the stratum velocity; the production well determines the depth value DEP of an oil-water interface of a research area; calculating seismic horizons of an oil-water interface; application to seismic horizons at oil-water interfaces. The seismic-based oil-water interface seismic horizon determination method has practical significance for effective reservoir development distribution research, improves precision and efficiency, saves drilling cost, and solves the problem of well position deployment. The invention is from the scientific research and production practice of oil and gas reservoirs and has good practicability.
Description
Technical Field
The invention relates to the technical field of seismic exploration, in particular to an oil-water interface seismic horizon determination method based on earthquake.
Background
In the research and development of oil and gas exploration, research on oil-water interfaces (including gas-water interfaces and gas-oil interfaces) is an extremely important topic.
In the prior art, the oil-water interface depth value of well data in a research area is conventionally adopted to draw out the plane development distribution of an effective reservoir, particularly the drawing between wells, the man-made subjectivity is large, the traditional method is low in precision, low in efficiency and high in well position deployment risk, the drilling cost is increased, and problems are brought to well position deployment.
Disclosure of Invention
The object of the present invention is to solve at least one of the technical drawbacks mentioned.
Therefore, the invention aims to provide an oil-water interface seismic horizon determination method based on earthquake.
In order to achieve the above object, an embodiment of the present invention provides a seismic-based method for determining seismic horizons of an oil-water interface, including the following steps:
step S1, geological data loading and interval velocity inversion;
step S2, the production well determines the depth value DEP of the oil-water interface of the research area;
step S3, calculating the seismic horizon of the oil-water interface;
and step S4, applying the seismic horizon of the oil-water interface.
Further, in step S1, the top and bottom seismic horizons and reservoir development boundary achievement data of the reservoir in the research area, and the logging and production well data of the research area are loaded into the software system, and the interval velocity achievement data volume of the research area is obtained through inversion calculation according to the seismic achievement data and logging data of the research area.
Further, in step S2, the oil-water interface value is calculated by performing statistical averaging based on the oil-water interface value in each production well data of the research area, and the oil-water interface value is used as the oil-water interface value DEP of the reservoir of the research area.
Further, in step S3, starting from zero milliseconds of the seismic imaging surface, the value of the depth of the sampling point is calculated by multiplying the value of the horizon value of each sampling point by the value of the time value of the sampling point, the depth value is compared and judged with the oil-water interface value DEP, when the value of the oil-water interface value DEP is approached, the sampling point close to the sampling point is obtained by analysis, and the time is assigned as the horizon time of the oil-water interface seismic channel of the seismic channel, so as to obtain the oil-water interface seismic horizon of the reservoir in the whole research area.
Further, in the step S4, the seismic horizon of the reservoir oil-water interface of the research area is calculated according to the step S3, and an effective reservoir plane distribution thickness map and a profile above the oil-water interface are obtained.
According to the oil-water interface seismic horizon determining method based on the earthquake, the seismic horizon velocity inversion method, the oil-water interface depth value determining method, the oil-water interface seismic horizon calculating method and the oil-water interface seismic horizon application method are adopted. The method solves the problem of seismic horizon determination of oil-water interfaces (including gas-water interfaces and gas-oil interfaces) based on earthquakes, has the characteristics of high precision, high efficiency and good practicability, and can rapidly and accurately carry out scientific research and production work of effective reservoir, oil-gas reservoirs and well position deployment. In order to reduce artificial subjectivity, improve precision and quickly and accurately carry out scientific research and production work of oil and gas reservoirs deeply, the invention provides an oil-water interface seismic position determining method based on earthquake, which has practical significance for effective reservoir development distribution research, improves precision and efficiency, saves drilling cost and solves the problem of well position deployment. The invention is from the scientific research and production practice of oil and gas reservoirs and has good practicability.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a seismic-based oil-water interface seismic horizon determination method according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a seismic-based seismic horizon determination method for an oil-water interface in accordance with an embodiment of the invention;
FIG. 3a is a plan view of the oil-water interface to the upper effective reservoir thickness profile achieved by the conventional method;
FIG. 3b is a plan view of the effective reservoir thickness at the oil-water interface, as achieved by the method of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention provides an oil-water interface seismic horizon determination method based on earthquake, wherein the mentioned effective reservoir is a reservoir above an oil-water interface (including an air-water interface and an air-oil interface) seismic horizon and between reservoir top boundaries. The method is suitable for determining the seismic horizon of an oil-water interface, a gas-water interface and a gas-oil interface.
As shown in fig. 1 and fig. 2, the seismic-based oil-water interface seismic horizon determining method according to the embodiment of the invention includes the following steps:
and step S1, geological data loading and layer velocity inversion.
Specifically, top boundary and bottom boundary seismic position and reservoir development boundary result data of a reservoir in a research area, and well logging and production well data of the research area are loaded into a software system, and a layer velocity result data volume of the research area is obtained through inversion calculation according to seismic result data and well logging data of the research area.
In the embodiment of the invention, an EPoffice EPS + software system inversion technology is used for carrying out inversion calculation to obtain a layer velocity result data body of a research area.
And step S2, the production well determines the depth value DEP of the oil-water interface of the research area.
Specifically, according to the oil-water interface value in each production well data of the research area, statistical averaging is carried out, the oil-water interface value is obtained through calculation, and the oil-water interface value is used as the oil-water interface value DEP of the reservoir of the research area.
And step S3, calculating the seismic horizon of the oil-water interface.
Specifically, starting from zero millisecond of a seismic imaging surface, multiplying each sample value layer velocity value by a sample point time value, calculating to obtain a depth value of the sample point, comparing and judging the depth value with an oil-water interface value DEP, analyzing to obtain a sample point close to the sample point when the sample point is close to the oil-water interface value DEP, assigning the sample point time as the oil-water interface seismic channel layer time of the seismic channel, and further obtaining the oil-water interface seismic layer of the reservoir layer of the whole research area. That is, when the DEP value is approached, the time of which sampling point the point is close to is analyzed, and the time is assigned as the sampling point time as the horizon time of the oil-water interface seismic channel of the seismic channel.
And step S4, applying the seismic horizon of the oil-water interface.
Specifically, the reservoir oil-water interface seismic horizon in the research area is obtained through calculation according to the step S3, and geological analysis drawings such as an effective reservoir plane distribution thickness diagram and a section diagram above the oil-water interface are accurately made and applied to scientific research and production.
Fig. 3a is a plane distribution diagram of effective reservoir thickness above an oil-water interface, which is realized by a conventional method, and fig. 3b is a plane distribution diagram of effective reservoir thickness above an oil-water interface, which is realized by the method of the present invention. By comparing fig. 3a and fig. 3b, it can be seen that the method provided by the present invention has effectively improved the accuracy of the available reservoir through the verification of the data of the drilled well and the production well.
According to the oil-water interface seismic horizon determining method based on the earthquake, the seismic horizon velocity inversion method, the oil-water interface depth value determining method, the oil-water interface seismic horizon calculating method and the oil-water interface seismic horizon application method are adopted. The method solves the problem of seismic horizon determination of oil-water interfaces (including gas-water interfaces and gas-oil interfaces) based on earthquakes, has the characteristics of high precision, high efficiency and good practicability, and can rapidly and accurately carry out scientific research and production work of effective reservoir, oil-gas reservoirs and well position deployment. In order to reduce artificial subjectivity, improve precision and quickly and accurately carry out scientific research and production work of oil and gas reservoirs deeply, the invention provides an oil-water interface seismic position determining method based on earthquake, which has practical significance for effective reservoir development distribution research, improves precision and efficiency, saves drilling cost and solves the problem of well position deployment. The invention is from the scientific research and production practice of oil and gas reservoirs and has good practicability.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. An oil-water interface seismic horizon determination method based on earthquake is characterized by comprising the following steps:
step S1, geological data loading and interval velocity inversion;
step S2, the production well determines the depth value DEP of the oil-water interface of the research area;
step S3, calculating the seismic horizon of the oil-water interface;
and step S4, applying the seismic horizon of the oil-water interface.
2. The seismic-based oil-water interface seismic horizon determining method of claim 1, wherein in step S1, top and bottom seismic horizon and reservoir development boundary achievement data of a reservoir in a research area, and research area logging and production well data are loaded into a software system, and a layer velocity achievement data volume of the research area is obtained through inversion calculation according to the seismic achievement data and the logging data of the research area.
3. The seismic-based method for determining seismic horizons at oil-water interfaces as claimed in claim 1, wherein in step S2, the statistical average is performed according to the oil-water interface values in the data of each production well in the research area, the oil-water interface value is calculated, and the oil-water interface value is used as the oil-water interface value DEP of the reservoir in the research area.
4. The seismic-based oil-water interface seismic horizon determining method according to claim 1, wherein in step S3, starting from zero milliseconds of a seismic imaging plane, a product of a horizon value and a time value of each sample point is calculated to obtain a depth value of the sample point, the depth value is compared and judged with an oil-water interface value DEP, when the oil-water interface value DEP is approached, the sample point close to the sample point is obtained through analysis, and the time is assigned as the horizon time of the oil-water interface seismic channel of the seismic channel, so as to obtain the oil-water interface seismic horizon of the reservoir in the whole research area.
5. The seismic-based method for determining seismic horizons at the oil-water interface of the reservoir as claimed in claim 1, wherein in the step S4, the reservoir oil-water interface seismic horizon of the research area is obtained by calculation according to the step S3, and an effective reservoir plane distribution thickness map and a profile above the oil-water interface are obtained.
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