CN108242069B - Oil reservoir profile compiling and drawing method based on seismic profile and time-depth relation - Google Patents
Oil reservoir profile compiling and drawing method based on seismic profile and time-depth relation Download PDFInfo
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- CN108242069B CN108242069B CN201611215757.8A CN201611215757A CN108242069B CN 108242069 B CN108242069 B CN 108242069B CN 201611215757 A CN201611215757 A CN 201611215757A CN 108242069 B CN108242069 B CN 108242069B
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Abstract
The invention provides an oil reservoir profile compiling and drawing method based on a seismic profile and time-depth relation, which comprises the following steps: cutting a well-connected seismic section with the same position as an oil reservoir section; step 2, measuring time information of the control point and calculating the depth of the control point; step 3, using the well-connected seismic profile as a bottom map of the oil reservoir profile; step 4, establishing a depth scale according to an oil reservoir profile compilation standard, and marking depth information of the control points; step 5, putting the single-well logging chart into a drawing area; and 6, compiling an oil reservoir profile according to the control point constraints. The oil reservoir profile compiling and drawing method based on the seismic profile and time-depth relation can accurately and quickly draw the oil reservoir profile matched with the actual geological condition, and can accurately reflect the development and distribution characteristics of the oil reservoir.
Description
Technical Field
The invention relates to the technical field of petroleum exploration, in particular to an oil reservoir profile compiling and drawing method based on seismic profiles and time-depth relations.
Background
The method for compiling the oil reservoir profile is formed by accurately and quickly drafting the oil reservoir profile matched with the actual geological condition aiming at the problems that the structure height of the stratum between a plurality of drilled wells is changed greatly and the fault is developed, so that the complexity of compiling the oil reservoir profile is high.
In oil and gas exploration work, in order to express the development and distribution characteristics of an oil reservoir, the oil reservoir profile is often required to be compiled, the oil reservoir profile is generally compiled through a plurality of drilling wells along a certain direction, the geological stratification and the oil reservoir depth disclosed by the drilling wells are generally credible due to the accuracy of drilling information, but the structural height change, the fault distance and the like of the stratum between the wells have less accuracy in the oil reservoir profile due to the lack of control point information, and the factors such as the structural height change, the fault distance and the like of the stratum have greater influence on the development and distribution of the oil and gas reservoir no matter whether the target stratum system is a recent system of a shallow layer or an ancient system or a former third system of a middle-deep layer, and the like, so that more accurate implementation is required. In the original oil reservoir profile compiling and drawing process, information such as the structure height change, fault distance and the like of stratums between wells is generally determined subjectively by a mapper, the accuracy is relatively low, therefore, an oil reservoir profile compiling and drawing method based on the seismic profile and the time-depth relation is invented, and the problems are solved.
Disclosure of Invention
The invention aims to provide a method for compiling an oil reservoir profile map for accurately realizing the position and the stratum form of an exploratory well based on a seismic profile and a time-depth relation.
The object of the invention can be achieved by the following technical measures: the oil reservoir profile compiling and drawing method based on the seismic profile and time-depth relation comprises the following steps: cutting a well-connected seismic section with the same position as an oil reservoir section; step 2, measuring time information of the control point and calculating the depth of the control point; step 3, using the well-connected seismic profile as a bottom map of the oil reservoir profile; step 4, establishing a depth scale according to an oil reservoir profile compilation standard, and marking depth information of the control points; step 5, putting the single-well logging chart into a drawing area; and 6, compiling an oil reservoir profile according to the control point constraints.
The object of the invention can also be achieved by the following technical measures:
in step 1, a seismic well tie profile is cut in the seismic workstation according to the well tie direction of the reservoir profile.
In step 2, when the time information of the control points is measured, the time information of the control points, namely reflection axes corresponding to geological layers in the earthquake, in the range of the vertical well section of the oil reservoir profile, at the boundary of the earthquake profile and each high-low turning point and each breakpoint of the fault is measured on the well-connected earthquake profile cut in step 1.
In step 2, when the depth of the control points is calculated, the time-depth relation corresponding to the multi-well synthetic record in the research area is synthesized, and a time-depth relation formula is regressed, so that the depth information corresponding to the time information measured in the control points of the geological stratification at the section boundary, the high-low turning points and the fault breakpoints is calculated.
In step 3, the well-connected seismic profile is used as a base map of the oil reservoir profile, and the boundary of the well-connected seismic profile is used as the boundary of the oil reservoir profile to establish a drawing area.
In step 4, when the depth scale is established, marking the depth scale lines on the outer sides of the boundaries at two sides of the oil reservoir profile in the drawing area established in step 3 according to the oil reservoir profile establishment standard, correcting the depth scale to be the altitude depth, and establishing the depth scale.
In step 4, when the depth information of the control points is marked, the horizontal positions of the seismic profile base map related in step 3 are taken as constraints, firstly, the horizontal positions of each geological stratification at the profile boundary, the high-low turning point and the fracture point of each fault are marked by vertical lines, and then, the depth data of each control point obtained by calculation is marked at each horizontal position by short lines according to the established depth scale.
In step 5, the log of each well involved in the reservoir profile is placed into the plot area according to its lateral position on the seismic profile base map involved in step 3.
In step 6, under the constraint of control points of each depth data annotation short line involved in the step 4 and the geological stratification depth of the single well logging map involved in the step 5, an oil reservoir profile map is compiled according to compilation standards.
The oil reservoir profile compiling and drawing method based on the seismic profile and the time-depth relation can accurately reflect the real forms of the stratum and the oil reservoir, accurately and quickly draw the oil reservoir profile matched with the actual geological condition, and accurately reflect the development and distribution characteristics of the oil reservoir.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for compiling a reservoir profile based on seismic profile and time-depth relationships in accordance with the present invention;
FIG. 2 is a schematic diagram of a cut seismic section in an embodiment of the invention;
FIG. 3 is a diagram illustrating control points to be measured according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of a cross-sectional bottom view of a reservoir in accordance with an embodiment of the present invention;
FIG. 5 is a schematic illustration of establishing a depth scale in a reservoir profile in an embodiment of the present invention;
FIG. 6 is a schematic illustration of annotated control point depth data in a reservoir profile in an embodiment of the invention;
FIG. 7 is a schematic of a bottom view of a section of a reservoir with a single well log placed therein in accordance with an embodiment of the present invention;
FIG. 8 is a cross-sectional view of a reservoir in an embodiment of the present invention.
Detailed Description
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
As shown in fig. 1, fig. 1 is a flow chart of the reservoir profile compiling method based on the seismic profile and time-depth relationship of the invention.
Step 101, cutting a well-connected seismic section with the same position as the oil reservoir section. The premise of drawing the oil reservoir profile is to cut the seismic profile of the connected wells, and to determine the position of the single well, the structural characteristics of the single well and the horizontal distribution of the stratum. It is therefore first necessary to cut a seismic well tie in the seismic workstation in the direction of the well tie of the reservoir profile, as shown in figure 2.
102, measuring time information of control points of reflection axes of geological layers on the earthquake, such as boundaries of earthquake sections, high and low turning points, fault break points and the like. On the well-connected seismic section cut in step 101, time information of reflection axes corresponding to geological layers in the vertical well section range of the oil reservoir section on the earthquake and control points such as high-low turning points and fracture points of the section and the like at the boundary of the seismic section is accurately measured, as shown in fig. 3.
And 103, synthesizing time-depth relations corresponding to the multi-well synthetic records in the research area, and regressing a time-depth relation formula to calculate depth information corresponding to the time information measured in the step 2 by the control points such as the geological stratification, the high-low turning points and the fault breakpoints, wherein the time-depth relations correspond to the time information, and the depth information is shown in fig. 3. In an embodiment, the depth-of-drilling relationship of 3 wells can be synthesized by the following calculation formula of the depth-of-drilling relationship:
D＝3846.153846×(e0.2444×T/1000-1)
wherein, D: a depth value; e: a natural constant; t: a time value.
And step 104, taking the well-connected seismic profile as a bottom map of the oil reservoir profile. The well-connected seismic profile is used as a base map of the reservoir profile, and the boundary of the well-connected seismic profile is used as the boundary of the reservoir profile to establish a drawing area, as shown in FIG. 4.
And 105, establishing a depth scale according to the reservoir profile compilation standard. And (4) marking the depth scale lines on the outer sides of the boundaries of the two sides of the oil reservoir profile in the drawing area established in the step (4) according to the oil reservoir profile establishment standard, establishing a depth scale, and setting the top surface to be the uniform altitude as shown in figure 5.
And step 106, with the horizontal position of the seismic profile base map related in the step 4 as a constraint, marking the horizontal positions of each geological stratification at the profile boundary, the high-low turning point and each fault breakpoint by using a vertical line, and marking the depth data of each control point obtained by calculation at each horizontal position by using a short line according to the depth scale established in the step 5, as shown in fig. 6.
Step 107, the logging histograms of the wells involved in the reservoir profile are placed into the plot area according to their lateral position on the seismic profile base map involved in step 4, as shown in FIG. 7.
And step 108, under the constraint of control points such as each depth data annotation short line involved in the step 6 and the geological stratification depth of the single-well logging map involved in the step 7, an oil reservoir profile map is compiled according to compilation standards, and is shown in fig. 8.
Claims (7)
1. The oil reservoir profile compiling and drawing method based on the seismic profile and time-depth relation is characterized by comprising the following steps of:
cutting a well-connected seismic section with the same position as an oil reservoir section;
step 2, measuring time information of the control point and calculating the depth of the control point;
step 3, using the well-connected seismic profile as a bottom map of the oil reservoir profile;
step 4, establishing a depth scale according to an oil reservoir profile compilation standard, and marking depth information of the control points;
step 5, putting the single-well logging chart into a drawing area;
step 6, compiling an oil reservoir profile according to control point constraints;
in step 2, when time information of control points is measured, measuring time information of control points, namely reflection axes corresponding to geological layers in the earthquake, at the boundary of the earthquake section, and high and low turning points and fracture points of the fault, of the seismic section within the range of the vertical well section of the oil reservoir section, on the well-connected earthquake section cut in step 1; when the depth of the control point is calculated, the time-depth relation corresponding to the multi-well synthetic record in the comprehensive research area is regressed to form a time-depth relation formula:
D＝3846.153846×(e0.2444×T/1000-1)
wherein, D: a depth value; e: a natural constant; t: time value
And calculating depth information corresponding to the time information measured by each geological stratification at the section boundary, each high-low turning point and each fault breakpoint.
2. A method for compiling a reservoir profile based on seismic profile and time-depth relationship as claimed in claim 1, characterized in that in step 1, the seismic well-tie profile is cut in the seismic workstation according to the well-tie direction of the reservoir profile.
3. A method for compiling a reservoir profile based on the seismic profile and time-depth relationship as claimed in claim 1, wherein in step 3, the well-connected seismic profile is used as the base map of the reservoir profile, and the boundary of the well-connected seismic profile is used as the boundary of the reservoir profile to establish the drawing area.
4. The method as claimed in claim 1, wherein in step 4, when the depth scale is established, the depth scale is marked outside the boundary of the two sides of the oil reservoir profile in the drawing area established in step 3 according to the oil reservoir profile establishment standard, and the depth scale is established by correcting the depth scale to the elevation depth.
5. The method as claimed in claim 1, wherein in step 4, during the annotation of the depth information of the control points, the horizontal positions of the geological stratification at the section boundary, the high-low turning point and the fault break point are marked by vertical lines with the horizontal position of the seismic profile base map related in step 3 as a constraint, and then the calculated depth data of the control points are marked at the respective horizontal positions by short lines with reference to the established depth scale.
6. A method for mapping a reservoir profile based on the seismic profile and time-depth relationship as claimed in claim 1, wherein in step 5, the logging histogram of each well involved in the reservoir profile is placed in the mapping area according to its lateral position on the seismic profile base map involved in step 3.
7. A method for compiling a reservoir profile based on the seismic profile and time-depth relationship as claimed in claim 1, wherein in step 6, the reservoir profile is compiled according to compilation standards under the constraints of control points, i.e. the short-line labeling of each depth data involved in step 4 and the geological stratification depth of the single-well log involved in step 5.
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| CN109375269B (en) * | 2018-11-23 | 2020-04-28 | 西安石油大学 | Method for establishing oil/gas reservoir mode by integrating geological and geophysical information |
| CN111175820B (en) * | 2020-01-10 | 2022-08-30 | 杨林海 | Analysis method for depth relation during synthetic seismic record clear breakpoint calibration determination |
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