CN110716024A - Method and device for determining physical property curve - Google Patents
Method and device for determining physical property curve Download PDFInfo
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- CN110716024A CN110716024A CN201810757353.4A CN201810757353A CN110716024A CN 110716024 A CN110716024 A CN 110716024A CN 201810757353 A CN201810757353 A CN 201810757353A CN 110716024 A CN110716024 A CN 110716024A
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Abstract
The application discloses a method and a device for determining a physical property curve, and belongs to the field of petroleum and natural gas exploitation. The method comprises the following steps: determining a plurality of reference wells with the same reservoir type as the reservoir type in the target depth range in the well to be tested; obtaining a target curve according to the physical property parameters and the n auxiliary parameters in the target depth range in the multiple reference wells; acquiring target auxiliary parameters at a plurality of depths within a target depth range in a well to be logged; determining a plurality of physical property parameters corresponding to the target auxiliary parameters at the plurality of depths in the target curve as the physical property parameters at the plurality of depths; and obtaining a physical property curve in a target depth range in the well to be measured according to the physical property parameters at the plurality of depths, wherein the physical property curve is a relation curve of the well depth and the physical property parameters. The method and the device solve the problem that the physical property curve of the well can not be directly measured in the logging-while-drilling mode, determine the physical property curve of the well drilled in the logging-while-drilling mode, and are used for determining the physical property curve.
Description
Technical Field
The application relates to the field of petroleum and natural gas exploitation, in particular to a method and a device for determining a physical property curve.
Background
Characteristic curves for oil and gas wells include: lithology, electrical, and physical property curves. The lithology curve can be used for judging the rock characteristics of the oil-gas well, the electrical curve can be used for judging the properties of fluid in the oil-gas well, and the physical curve can be used for judging the characteristics of a reservoir in the oil-gas well.
Characteristic curves for oil and gas wells are typically obtained from characteristic parameters, which can be measured in two ways. One of the modes is logging after drilling, and the other mode is logging while drilling (i.e. logging while drilling). In the logging while drilling method, the physical property parameters in the characteristic parameters are usually not measured, and thus a physical property curve cannot be obtained.
Because the physical property curve of the well cannot be obtained in the logging while drilling mode in the related art, a method for determining the physical property curve of the logging while drilling mode is urgently needed.
Disclosure of Invention
The application provides a method and a device for determining a physical property curve, which can solve the problem that the physical property curve cannot be directly measured in a logging while drilling mode, and the technical scheme is as follows:
in one aspect, a method for determining a physical property curve is provided, the method comprising:
determining a plurality of reference wells with the same reservoir type as the reservoir type in the target depth range in the well to be tested;
obtaining a target curve according to the physical property parameters and the n auxiliary parameters in the target depth range in the multiple reference wells, wherein the target curve is a relation curve of the target auxiliary parameters and the physical property parameters, the target auxiliary parameters are the parameters with the highest correlation degree with the physical property parameters in the n auxiliary parameters, and n is more than or equal to 1;
acquiring the target auxiliary parameters at a plurality of depths within the target depth range in the well to be logged;
determining a plurality of physical property parameters corresponding to the target auxiliary parameters at the plurality of depths in the target curve as the physical property parameters at the plurality of depths;
and obtaining a physical property curve in the target depth range in the well to be measured according to the physical property parameters at the plurality of depths, wherein the physical property curve is a relation curve of the well depth and the physical property parameters.
Optionally, the obtaining a target curve according to the physical property parameters and the n auxiliary parameters in the target depth ranges in the multiple reference wells includes:
selecting one reference well from the plurality of reference wells as a target reference well;
obtaining a relation curve of each auxiliary parameter and the physical property parameter of the target reference well according to the physical property parameter and each auxiliary parameter in the target depth range in the target reference well;
determining a correlation coefficient of a relation curve of each auxiliary parameter of the target reference well and the physical property parameter;
determining the auxiliary parameter with the highest correlation coefficient of the relation curve of the n auxiliary parameters of the target reference well and the physical property parameter as the target auxiliary parameter;
and obtaining the target curve according to the physical property parameters and the target auxiliary parameters in the target depth ranges in the multiple reference wells.
Optionally, before obtaining the target curve according to the physical property parameters and the n auxiliary parameters in the target depth ranges in the plurality of reference wells, the method further includes:
screening a standard well from the plurality of reference wells, wherein the physical property parameters and the n auxiliary parameters of the standard well are measured by high-resolution induction HRIL, or the physical property parameters and the n auxiliary parameters of the standard well are measured by logging after drilling;
and normalizing the physical property parameters of the plurality of reference wells and the n auxiliary parameters so that the most significant values of the physical property parameters of other reference wells are the same as those of the standard well, and the most significant values of each auxiliary parameter are also the same, wherein the other reference wells are the reference wells except for the standard well.
Optionally, the n auxiliary parameters include: lithology parameters and electrical parameters.
Optionally, the well to be logged is a horizontal well, and the target depth range of the well to be logged is the depth range of the horizontal section in the horizontal well.
In another aspect, there is provided a property curve determining apparatus including:
the first determination module is used for determining a plurality of reference wells with the same reservoir types in the target depth range of the well to be detected;
the second determination module is used for obtaining a target curve according to the physical property parameters and the n auxiliary parameters in the target depth range in the multiple reference wells, wherein the target curve is a relation curve of the target auxiliary parameters and the physical property parameters, the target auxiliary parameters are parameters with the highest correlation degree with the physical property parameters in the n auxiliary parameters, and n is larger than or equal to 1;
a first obtaining module, configured to obtain the target auxiliary parameters at a plurality of depths within the target depth range in the well to be logged;
a third determining module, configured to determine, as the physical property parameters at the multiple depths, multiple physical property parameters corresponding to the target auxiliary parameters at the multiple depths in the target curve;
and the fourth determining module is used for obtaining a physical property curve in the target depth range in the well to be measured according to the physical property parameters at the multiple depths, wherein the physical property curve is a relation curve of the well depth and the physical property parameters.
Optionally, the second determining module includes:
the first acquisition unit is used for selecting one reference well from the plurality of reference wells as a target reference well;
the first determining unit is used for obtaining a relation curve of each auxiliary parameter and the physical property parameter of the target reference well according to the physical property parameter and each auxiliary parameter in the target depth range in the target reference well;
a second determination unit for determining a correlation coefficient of a relation curve of each auxiliary parameter of the target reference well and the physical property parameter;
a third determining unit, configured to determine, as the target auxiliary parameter, an auxiliary parameter with a highest correlation coefficient of a relationship curve with the physical property parameter among the n auxiliary parameters of the target reference well;
and the fourth determining unit is used for obtaining the target curve according to the physical property parameters and the target auxiliary parameters in the target depth range in the plurality of reference wells.
Optionally, the apparatus for determining a physical property curve further includes:
a second obtaining module, configured to screen a standard well from the multiple reference wells, where the physical property parameter and the n auxiliary parameters of the standard well are both measured by using a high resolution induction HRIL method, or both the physical property parameter and the n auxiliary parameters of the standard well are measured by using a post-drilling logging method;
and the first processing module is used for carrying out standardization processing on the physical property parameters of the plurality of reference wells and the n auxiliary parameters, so that the most occupied values of the physical property parameters of other reference wells are the same as those of the standard wells, and the most occupied values of each auxiliary parameter are also the same, wherein the other reference wells are the reference wells except for the standard wells.
Optionally, the n auxiliary parameters include: lithology parameters and electrical parameters.
Optionally, the well to be logged is a horizontal well, and the target depth range of the well to be logged is the depth range of the horizontal section in the horizontal well.
The beneficial effect that technical scheme that this application provided brought includes at least: according to the method for determining the physical property curve, provided by the embodiment of the invention, the target curve is obtained according to the physical property parameter and the target auxiliary parameter of the reference well, then the target curve is applied to the well to be measured, the physical property parameter of the well to be measured is obtained according to the auxiliary parameter in the well to be measured, and the physical property curve of the well is obtained according to the physical property parameter of the well to be measured. When the logging-while-drilling mode is adopted for logging the well to be logged, the physical property curve of the well to be logged can be obtained according to the target curve, so that the physical property curve of the well to be logged can be directly obtained in the logging-while-drilling mode.
In addition, the target auxiliary parameter in the embodiment of the invention is the parameter with the highest correlation degree with the physical property parameter in the n auxiliary parameters, so that the physical property parameter represented by the target curve is more consistent with the actual physical property parameter, the correlation degree between the physical property parameter of the well to be measured determined according to the target curve and the actual physical property parameter of the well to be measured is higher, and the accuracy of judging the reservoir property in the oil and gas well according to the physical property curve of the well to be measured is higher.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for determining a physical property curve according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for determining a physical property curve according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a horizontal well provided by an embodiment of the present invention;
FIG. 4 is a histogram of a natural gamma distribution according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a relationship between lithology parameters and physical property parameters of a target reference well according to an embodiment of the present invention;
FIG. 6 is a graph illustrating a relationship between an electrical parameter and a physical parameter of a target reference well according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a target curve provided by an embodiment of the present invention;
FIG. 8 is a schematic illustration of another target curve provided by an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a physical property parameter determining apparatus provided in an embodiment of the present invention;
FIG. 10 is a block diagram of a second determining module according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of another physical property parameter determination device according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for determining a physical property curve according to an embodiment of the present invention. As shown in fig. 1, the method for determining the property curve may include:
102, obtaining a target curve according to the physical property parameters and the n auxiliary parameters in the target depth range in the multiple reference wells, wherein the target curve is a relation curve of the target auxiliary parameters and the physical property parameters, the target auxiliary parameters are parameters with the highest degree of correlation with the physical property parameters in the n auxiliary parameters, and n is larger than or equal to 1.
And 103, acquiring target auxiliary parameters at a plurality of depths within a target depth range in the well to be logged.
And 104, determining a plurality of physical property parameters corresponding to the target auxiliary parameters at the plurality of depths in the target curve as the physical property parameters at the plurality of depths.
And 105, obtaining a physical property curve in a target depth range in the well to be measured according to the physical property parameters at the multiple depths, wherein the physical property curve is a relation curve of the well depth and the physical property parameters.
In summary, in the method for determining a physical property curve provided in the embodiment of the present invention, a target curve is obtained according to a physical property parameter of a reference well and a target auxiliary parameter, then the target curve is applied to a well to be measured, the physical property parameter of the well to be measured is obtained according to the auxiliary parameter in the well to be measured, and then the physical property curve of the well to be measured is obtained according to the physical property parameter of the well to be measured. When the logging-while-drilling mode is adopted for logging the well to be logged, the physical property curve of the well to be logged can be obtained according to the target curve, so that the physical property curve of the well to be logged can be directly obtained in the logging-while-drilling mode.
In addition, the target auxiliary parameter in the embodiment of the invention is the parameter with the highest correlation degree with the physical property parameter in the n auxiliary parameters, so that the physical property parameter represented by the target curve is more consistent with the actual physical property parameter, the correlation degree between the physical property parameter of the well to be measured determined according to the target curve and the actual physical property parameter of the well to be measured is higher, and the accuracy of judging the reservoir property in the oil and gas well according to the physical property curve of the well to be measured is higher.
Fig. 2 is a flowchart of another method for determining a physical property curve according to an embodiment of the present invention. As shown in fig. 2, the method for determining the property curve may include:
step 201, a plurality of reference wells with the same reservoir type as the reservoir type in the target depth range in the well to be measured are determined.
The target depth range is a depth range of the physical property parameter to be measured in the borehole to be measured. For example, when the well to be logged is a horizontal well as shown in fig. 3, the target depth range to be logged may be the depth range of a horizontal segment within the horizontal well. Optionally, the target depth range may span a depth of 10m, 15m, or 25m, and the like, which is not limited in this embodiment of the present invention.
The reservoirs in the well may be of several types, clastic, carbonate and argillaceous, respectively. For example, when the type of the reservoir within the target depth range to be logged is a clastic rock type, a plurality of wells within the target depth range in which the reservoir type is also a clastic rock type may be selected as reference wells.
The well to be tested may be an oil well or a gas well, and optionally, the well to be tested may also be another well except the oil well or the gas well, which is not limited in the embodiment of the present invention. The well to be tested can be drilled and logged in a logging-while-drilling mode, or the well is drilled and logged in a logging-while-drilling mode after the well is drilled.
The number of the reference wells determined in step 201 may be 2 or 8, optionally, the number of the reference wells determined in step 201 may also be other than 2 or 8, for example, 6, which is not limited in the embodiment of the present invention. For example, the reference well may be a well that is drilled and logged first, which is also referred to as a directional well, and the physical property parameter and the auxiliary parameter are known within a target depth range in the reference well. Optionally, the reference well may also be a well with other physical parameters and auxiliary parameters within a known target depth range, which is not limited in the embodiment of the present invention.
It should be noted that each reference well may have a plurality of parameters, and the plurality of parameters may include physical parameters, and auxiliary parameters different from the physical parameters, such as electrical parameters and lithology parameters. Alternatively, the physical property parameter may be permeability or porosity. Wherein permeability is used to indicate the ability of the rock to allow fluid to pass through at a certain pressure differential; porosity refers to the ratio of the pore volume in the rock to the total volume of the rock. The electrical parameter may be resistivity and the lithology parameter may be natural gamma.
And 202, acquiring physical property parameters and n auxiliary parameters in the target depth range in each reference well.
Step 203, screening a standard well from the plurality of reference wells.
It should be noted that when a standard well is screened from a plurality of reference wells, the standard well may be screened by measuring parameters of the well. The parameters of each well can be measured by High Resolution Induction (HRIL), or by Logging while drilling, or by Logging after drilling.
Optionally, when there is a reference well whose parameters of the well are measured in the HRIL manner among the multiple reference wells obtained in step 201, any one of the reference wells whose parameters are measured in the HRIL manner may be selected as the standard well. When no reference well whose well parameters are measured in the HRIL manner exists in the plurality of reference wells acquired in step 201, the reference well whose well parameters are measured in the post-drilling logging manner may be selected as the standard well. Therefore, the physical property parameters and the n auxiliary parameters of the standard well are measured by adopting the HRIL mode, or the physical property parameters and the n auxiliary parameters of the standard well are measured by adopting the logging mode after the well drilling.
And 204, normalizing the physical property parameters of the plurality of reference wells and the n auxiliary parameters so that the most significant values of the physical property parameters of the other reference wells are the same as those of the standard wells, the most significant values of each auxiliary parameter are also the same, and the other reference wells are the reference wells except the standard wells.
The process of normalizing the property parameters and each auxiliary parameter for a plurality of reference wells may include:
and sequentially detecting whether the most-shared value in the physical property parameters of each reference well is the same as that of the physical property parameters of the standard well and whether the most-shared value in each auxiliary parameter of the reference well is the same as that of the auxiliary parameters of the standard well in other reference wells except the standard well.
If the most significant value of the certain parameter (physical property parameter and any parameter of the n auxiliary parameters) of a certain reference well is the same as that of a standard well, the parameter of the reference well does not need to be adjusted.
If the most compared value of a certain parameter (physical property parameter and any parameter of n auxiliary parameters) of a certain reference well is different from that of a standard well, the parameter of the reference well is adjusted so that the most compared value of the parameter of the reference well is the same as that of the standard well.
For example, the above adjustment process for the parameters may be implemented by a histogram shifting method. The following will explain the adjustment process of the lithology parameter of a reference well, which may be a natural gamma value, as an example.
When adjusting the lithology parameter of the reference well, a natural gamma value distribution histogram (as shown in 4a in fig. 4) of the reference well can be generated according to the lithology parameter. Wherein, the abscissa in the histogram is the natural gamma value, and the unit is the measurement unit of natural gamma and neutron gamma logging (English: American Petroleum institute; abbreviated as API) specified by the American Petroleum institute; the ordinate of the histogram is the proportion of natural gamma values in the lithology parameters, in percent (%). As shown at 4a in fig. 4, the natural gamma value for which the lithology parameter of the reference well is most significant is about 93 API.
If the most significant natural gamma value (not shown in fig. 4) in the lithological parameters of the standard well is 72API, the histogram 4a in fig. 4 may be translated to obtain the histogram 4b, so that the most significant natural gamma value in the translated histogram 4b is the same as the most significant natural gamma value in the lithological parameters of the standard well. Further, the lithology parameter of the reference well needs to be adjusted according to the translated histogram 4b, so that the distribution of natural gamma values in the adjusted lithology parameter conforms to the histogram 4 b.
It should be noted that, for the adjustment process of other parameters, reference may be made to the adjustment process of lithological parameters, which is not described herein again in the embodiments of the present invention.
And in the physical property parameters of the plurality of reference wells after the standardization treatment and each auxiliary parameter, the most significant values of the physical property parameters are the same, and the most significant values of the auxiliary parameters are the same. And because the parameters of the standard well are measured in an HRIL mode and a logging mode after drilling, and the precision of the parameters measured in the HRIL mode and the logging mode after drilling is higher, the parameters of other reference wells are adjusted according to the parameter distribution of the standard well, and the errors of the parameters of other reference wells can be reduced.
Step 205, selecting a reference well from the plurality of reference wells as a target reference well.
And selecting one reference well from the plurality of reference wells after the standardization treatment (such as randomly selecting one reference well) as a target reference well, wherein the physical property parameters and the n auxiliary parameters in the target reference well are the parameters after the standardization treatment.
And step 206, obtaining a relation curve between each auxiliary parameter and the physical property parameter of the target reference well according to each auxiliary parameter and physical property parameter in the target depth range of the target reference well.
And after the target reference well is selected, obtaining a relation curve between each auxiliary parameter and the physical property parameter of the target reference well according to the physical property parameter and each auxiliary parameter in the target depth range in the target reference well.
In the embodiment of the present invention, step 206 will be explained by taking the auxiliary parameter as the lithology parameter and obtaining the relationship curve between the lithology parameter and the physical property parameter as an example.
Firstly, the physical property parameter in the target depth range in the target reference well and the lithology parameter in the target depth range in the target reference well need to be obtained. Then, from the acquired physical property parameters and lithology parameters of the target reference well, physical property parameters and lithology parameters at a plurality of specified depths (e.g., 80 specified depths) are acquired. And finally, fitting a relation curve of the lithology parameters and the physical property parameters of the target reference well according to the lithology parameters and the physical property parameters corresponding to the collected specified depths. Optionally, the relationship curve may be obtained by fitting software, for example, Matrix Laboratory (MATLAB) software, which is not limited in the embodiment of the present invention.
It should be noted that, the process of obtaining the relationship curve between other auxiliary parameters and the physical property parameter of the target reference well may refer to the process of obtaining the relationship curve between the lithology parameter and the physical property parameter, and the embodiment of the present invention is not described herein again.
And step 207, determining a correlation coefficient of a relation curve of each auxiliary parameter and the physical property parameter of the target reference well.
After obtaining the relation curve between each auxiliary parameter and the physical property parameter of the target reference well, the correlation coefficient of the relation curve between each auxiliary parameter and the physical property parameter can be obtained by using a calculation formula of the correlation coefficient r, where the calculation formula is:
wherein the content of the first and second substances,
presentation pair
The square of the square is opened, and the square is opened,presentation pair
Summing from i-1 to i-m,
to represent
And
product of (a), xiAn auxiliary parameter indicative of an ith specified depth in the target reference well,
mean value of auxiliary parameters, y, representing the 1 st to m th specified depths in the target reference welliA physical property parameter indicative of an ith specified depth in the target reference well,
the representation represents the 1 st to the 1 st in the target reference wellAnd the average value of the physical property parameters of m designated depths, wherein m represents the number of designated depths in the target reference well, and m is an integer greater than or equal to 1. The larger the correlation coefficient between the auxiliary parameter and the physical property parameter is, the higher the correlation degree between the auxiliary parameter and the physical property parameter is.
And step 208, determining the auxiliary parameter with the highest correlation coefficient of the relation curve between the n auxiliary parameters of the target reference well and the physical property parameter as the target auxiliary parameter.
And after determining the correlation coefficient between each auxiliary parameter and the physical property parameter in the target reference well, selecting the highest auxiliary parameter in the correlation coefficients of the physical property parameters as the target auxiliary parameter.
Step 208 will be explained below by taking the example that the n auxiliary parameters include 2 auxiliary parameters. Wherein, the 2 auxiliary parameters are lithology parameters and electrical parameters.
For example, fig. 5 is a schematic diagram of a relationship curve between lithological parameters and physical parameters of a target reference well according to an embodiment of the present invention. As shown in fig. 5, the abscissa of the relationship curve is the lithology parameter: natural gamma value in units of API; the ordinate of the relationship is a physical property parameter: porosity in percent (%). When a relation curve of lithology parameters and physical property parameters of a target reference well is drawn, first obtaining lithology parameters and physical property parameters of a plurality of specified depths in the target reference well, and marking points corresponding to the lithology parameters and the physical property parameters in fig. 5, for example, when a natural gamma value is 60API and a porosity is 34%, a point a (60API, 34%) in fig. 5 can be obtained; and then fitting a plurality of points corresponding to the plurality of lithological parameters and the plurality of physical parameters to obtain a curve B, wherein the curve B is a relation curve of the lithological parameters (natural gamma values) and the physical parameters (porosity), and the correlation coefficient of the relation curve can be 0.848.
Fig. 6 is a graph illustrating a relationship between an electrical parameter and a physical parameter of a target reference well according to an embodiment of the present invention. As shown in fig. 6, the abscissa of the relationship curve is the electrical parameter: the unit of the resistivity is omega.m (omega.m), and the ordinate of the candidate curve is a physical property parameter: porosity in percent (%). When a relation curve of lithology parameters and physical property parameters of a target reference well is drawn, first obtaining lithology parameters and physical property parameters of a plurality of specified depths in the target reference well, and marking points corresponding to the lithology parameters and the physical property parameters in fig. 6, for example, when the resistivity is 9 Ω · m and the porosity is 31%, a point C (9 Ω · m, 31%) in fig. 6 can be obtained; and then fitting a plurality of points corresponding to the plurality of electrical parameters and the plurality of physical parameters to obtain a curve D, wherein the curve D is a relation curve of the electrical parameters (resistivity) and the physical parameters (porosity), and the correlation coefficient of the relation curve can be 0.047.
It can be seen that the correlation coefficient of the lithology parameter and the physical property parameter is 0.848 which is greater than the correlation coefficient of the electrical parameter and the physical property parameter which is 0.047, i.e. the correlation degree of the lithology parameter and the physical property parameter is higher. The lithology parameter can be used as a target auxiliary parameter.
And 209, obtaining a target curve according to the target auxiliary parameters and the physical property parameters in the target depth range in the multiple reference wells.
After the target auxiliary parameters are obtained, a target curve can be fitted according to the physical property parameters and the target auxiliary parameters in the target depth range in the multiple reference wells. The fitting method of the target curve may refer to the fitting method of the relationship curve between the lithology parameter and the physical property parameter in step 206.
The embodiment of the present invention will illustrate step 209 by taking the obtained target parameter as the lithology parameter.
For example, fig. 7 is a schematic diagram of a target curve provided by the embodiment of the present invention. As shown in fig. 7, the target curve is a relationship curve between a lithology parameter (natural gamma value) and a physical property parameter (porosity). The abscissa of the target curve is the natural gamma value in units of API and the ordinate of the target curve is the porosity in units of percentage (%). Referring to fig. 7, when drawing a target curve corresponding to lithology parameters and physical parameters, first obtaining lithology parameters (natural gamma values) and physical parameters (porosity) at a plurality of specified depths in a plurality of reference wells, and marking points corresponding to the lithology parameters and the physical parameters in fig. 7, for example, when the natural gamma value is 90API and the porosity is 16%, obtaining a point E (90API, 16%) in fig. 7; then, a curve F is obtained by fitting a plurality of points corresponding to the plurality of lithological parameters and the plurality of physical parameters, where the curve F is a target curve corresponding to the lithological parameters (natural gamma values) and the physical parameters (porosity), the target curve is a part of a downward-opening parabola, and a correlation coefficient between the lithological parameters (natural gamma values) and the physical parameters (porosity) can be 0.861.
Fig. 8 is a schematic diagram of another target curve provided by the embodiment of the invention. As shown in fig. 8, the target curve is a relationship curve between a lithology curve (natural gamma value) and a physical property curve (permeability). The target curve abscissa is the natural gamma value in units of API, and the target curve ordinate is the permeability in units of millidarcy (md). Referring to fig. 8, when drawing a target curve corresponding to lithology parameters and physical parameters, first obtaining lithology parameters (natural gamma values) and physical parameters (permeability) at a plurality of specified depths in a plurality of reference wells, and marking points corresponding to the lithology parameters and the physical parameters in fig. 8, for example, when the natural gamma value is 65API and the permeability is 800md, obtaining a point G (65API, 800md) in fig. 8; and then fitting a plurality of points corresponding to the plurality of lithological parameters and the plurality of physical parameters to obtain a curve H, wherein the curve H is a target curve corresponding to the lithological parameters (natural gamma values) and the physical parameters (permeability), the target curve is a part of a parabola with an upward opening, and the correlation coefficient of the lithological parameters (natural gamma values) and the physical parameters (permeability) can be 0.878.
The target curve is a relation curve between the target auxiliary parameter and the physical property parameter, and the target auxiliary parameter is the auxiliary parameter with the highest correlation coefficient of the relation curve between the target auxiliary parameter and the physical property parameter in the n types of auxiliary parameters of the multiple reference wells, so the physical property parameter represented by the target curve is more consistent with the actual physical property parameter, and the correlation between the physical property parameter of the well to be measured determined according to the target curve and the actual physical property parameter of the well to be measured is higher.
Step 210, target auxiliary parameters at a plurality of depths within a target depth range in the well to be logged are obtained.
When drilling a well within a target depth range to be logged, target auxiliary parameters at a plurality of depths within the target depth range in the well to be logged can be obtained.
And step 211, determining a plurality of physical property parameters corresponding to the target auxiliary parameters at the plurality of depths in the target curve as the physical property parameters at the plurality of depths.
After a plurality of target auxiliary parameters in a target depth range in the well to be logged are obtained, a plurality of physical property parameters corresponding to the target auxiliary parameters at a plurality of depths in a target curve are determined as physical property parameters at a plurality of depths.
And step 212, obtaining a physical property curve in a target depth range in the well to be measured according to the physical property parameters at the plurality of depths, wherein the physical property curve is a relation curve of the well depth and the physical property parameters.
The physical property curve in the well to be logged can reflect the distribution of the residual oil in the well to be logged, and the physical property curve can lay a foundation for the development of the well to be logged.
In summary, in the method for determining a physical property curve provided in the embodiment of the present invention, a target curve is obtained according to a physical property parameter of a reference well and a target auxiliary parameter, then the target curve is applied to a well to be measured, the physical property parameter of the well to be measured is obtained according to the auxiliary parameter in the well to be measured, and then the physical property curve of the well to be measured is obtained according to the physical property parameter of the well to be measured. When the logging-while-drilling mode is adopted for logging the well to be logged, the physical property curve of the well to be logged can be obtained according to the target curve, so that the physical property curve of the well to be logged can be directly obtained in the logging-while-drilling mode.
Fig. 9 is a schematic structural diagram of a physical property parameter determination apparatus according to an embodiment of the present invention. Referring to fig. 9, the physical property parameter determination device 90 includes:
a first determining module 901, configured to determine a plurality of reference wells that are the same as reservoir types in a target depth range in a well to be measured;
a second determining module 902, configured to obtain a target curve according to the physical property parameters and the n types of auxiliary parameters in the target depth range in the multiple reference wells, where the target curve is a relationship curve between the target auxiliary parameters and the physical property parameters, the target auxiliary parameters are parameters with the highest correlation with the physical property parameters among the n types of auxiliary parameters, and n is greater than or equal to 1;
a first obtaining module 903, configured to obtain target auxiliary parameters at multiple depths within a target depth range in a well to be logged;
a third determining module 904, configured to determine a plurality of physical property parameters corresponding to the target auxiliary parameters at the plurality of depths in the target curve as the physical property parameters at the plurality of depths;
and a fourth determining module 905, configured to obtain a physical property curve in a target depth range in the well to be measured according to the physical property parameters at the multiple depths, where the physical property curve is a relationship curve between the well depth and the physical property parameters.
In summary, in the apparatus for determining a physical property curve provided in the embodiment of the present invention, the second determining module obtains a target curve according to the physical property parameter of the reference well and the target auxiliary parameter, then the third determining module applies the target curve to the well to be measured, obtains the physical property parameter of the well to be measured according to the auxiliary parameter of the well to be measured, and then the fourth determining module obtains the physical property curve of the well according to the physical property parameter of the well to be measured. When the logging-while-drilling mode is adopted for logging the well to be logged, the physical property curve of the well to be logged can be obtained according to the target curve, so that the physical property curve of the well to be logged can be directly obtained in the logging-while-drilling mode.
In addition, the target auxiliary parameter in the embodiment of the invention is the parameter with the highest correlation degree with the physical property parameter in the n auxiliary parameters, so that the physical property parameter represented by the target curve is more consistent with the actual physical property parameter, the correlation degree between the physical property parameter of the well to be measured determined according to the target curve and the actual physical property parameter of the well to be measured is higher, and the accuracy of judging the reservoir property in the oil and gas well according to the physical property curve of the well to be measured is higher.
Optionally, fig. 10 is a schematic structural diagram of a second determining module according to an embodiment of the present invention. As shown in fig. 10, the second determining module 902 may include:
a first obtaining unit 9021, configured to select one reference well from the multiple reference wells as a target reference well;
the first determining unit 9022 is configured to obtain a relationship curve between each auxiliary parameter and a physical property parameter of the target reference well according to the physical property parameter and each auxiliary parameter within the target depth range in the target reference well;
the second determining unit 9023 is configured to determine a correlation coefficient of a relation curve between each auxiliary parameter of the target reference well and the physical property parameter;
a third determining unit 9024, configured to determine, as a target auxiliary parameter, an auxiliary parameter with a highest correlation coefficient of a relationship curve between the physical property parameter and the n types of auxiliary parameters of the target reference well;
and the fourth determining unit 9025 is configured to obtain a target curve according to the physical property parameters and the target auxiliary parameters in the target depth range in the multiple reference wells.
Optionally, fig. 11 is a schematic structural diagram of another apparatus for determining a physical property parameter according to an embodiment of the present invention, as shown in fig. 11, on the basis of fig. 9, the apparatus 90 for determining a physical property parameter may further include:
a second obtaining module 906, configured to screen a standard well from the multiple reference wells, where the physical property parameter and the n auxiliary parameters of the standard well are both measured in a high-resolution HRIL sensing manner, or both the physical property parameter and the n auxiliary parameters of the standard well are measured in a post-drilling logging manner;
the first processing module 907 is configured to perform normalization processing on the physical property parameters of the plurality of reference wells and the n auxiliary parameters, so that the most significant values of the physical property parameters of the other reference wells are the same as those of the standard well, and the most significant values of each auxiliary parameter are also the same, where the other reference wells are the reference wells other than the standard well.
Optionally, the n auxiliary parameters include: lithology parameters and electrical parameters.
Optionally, the well to be logged is a horizontal well, and the target depth range of the well to be logged is the depth range of the horizontal section in the horizontal well.
In summary, in the apparatus for determining a physical property curve provided in the embodiment of the present invention, the second determining module obtains a target curve according to the physical property parameter of the reference well and the target auxiliary parameter, then the third determining module applies the target curve to the well to be measured, obtains the physical property parameter of the well to be measured according to the auxiliary parameter of the well to be measured, and then the fourth determining module obtains the physical property curve of the well according to the physical property parameter of the well to be measured. When the logging-while-drilling mode is adopted for logging the well to be logged, the physical property curve of the well to be logged can be obtained according to the target curve, so that the physical property curve of the well to be logged can be directly obtained in the logging-while-drilling mode.
It should be noted that, the method embodiment provided in the embodiment of the present invention can be mutually referred to a corresponding apparatus embodiment, and the embodiment of the present invention does not limit this. The sequence of the steps of the method embodiments provided by the embodiments of the present invention can be appropriately adjusted, and the steps can be correspondingly increased or decreased according to the situation, and any method that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention shall be covered by the protection scope of the present invention, and therefore, the detailed description thereof shall not be repeated.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method for determining a physical property curve, the method comprising:
determining a plurality of reference wells with the same reservoir type as the reservoir type in the target depth range in the well to be tested;
obtaining a target curve according to the physical property parameters and the n auxiliary parameters in the target depth range in the multiple reference wells, wherein the target curve is a relation curve of the target auxiliary parameters and the physical property parameters, the target auxiliary parameters are the parameters with the highest correlation degree with the physical property parameters in the n auxiliary parameters, and n is more than or equal to 1;
acquiring the target auxiliary parameters at a plurality of depths within the target depth range in the well to be logged;
determining a plurality of physical property parameters corresponding to the target auxiliary parameters at the plurality of depths in the target curve as the physical property parameters at the plurality of depths;
and obtaining a physical property curve in the target depth range in the well to be measured according to the physical property parameters at the plurality of depths, wherein the physical property curve is a relation curve of the well depth and the physical property parameters.
2. The method of claim 1, wherein the deriving a target profile from the property parameters and n auxiliary parameters over a target depth range in the plurality of reference wells comprises:
selecting one reference well from the plurality of reference wells as a target reference well;
obtaining a relation curve of each auxiliary parameter and the physical property parameter of the target reference well according to the physical property parameter and each auxiliary parameter in the target depth range in the target reference well;
determining a correlation coefficient of a relation curve of each auxiliary parameter of the target reference well and the physical property parameter;
determining the auxiliary parameter with the highest correlation coefficient of the relation curve of the n auxiliary parameters of the target reference well and the physical property parameter as the target auxiliary parameter;
and obtaining the target curve according to the physical property parameters and the target auxiliary parameters in the target depth ranges in the multiple reference wells.
3. The method of claim 2, wherein prior to said deriving a target profile from the property parameters and the n auxiliary parameters within the target depth range in the plurality of reference wells, the method further comprises:
screening a standard well from the plurality of reference wells, wherein the physical property parameters and the n auxiliary parameters of the standard well are both measured by high-resolution induction HRIL, or the physical property parameters and the n auxiliary parameters of the standard well are both measured by logging after drilling;
and normalizing the physical property parameters of the plurality of reference wells and the n auxiliary parameters so that the most significant values of the physical property parameters of other reference wells are the same as those of the standard well, and the most significant values of each auxiliary parameter are also the same, wherein the other reference wells are the reference wells except for the standard well.
4. The method according to any of claims 1 to 3, wherein the n auxiliary parameters comprise: lithology parameters and electrical parameters.
5. The method of claim 1, wherein the well to be logged is a horizontal well and the target depth range for the well to be logged is a depth range of a horizontal segment within the horizontal well.
6. A property curve determination device, characterized by comprising:
the first determination module is used for determining a plurality of reference wells with the same reservoir types in the target depth range of the well to be detected;
the second determination module is used for obtaining a target curve according to the physical property parameters and the n auxiliary parameters in the target depth range in the multiple reference wells, wherein the target curve is a relation curve of the target auxiliary parameters and the physical property parameters, the target auxiliary parameters are parameters with the highest correlation degree with the physical property parameters in the n auxiliary parameters, and n is larger than or equal to 1;
a first obtaining module, configured to obtain the target auxiliary parameters at a plurality of depths within the target depth range in the well to be logged;
a third determining module, configured to determine, as the physical property parameters at the multiple depths, multiple physical property parameters corresponding to the target auxiliary parameters at the multiple depths in the target curve;
and the fourth determining module is used for obtaining a physical property curve in the target depth range in the well to be measured according to the physical property parameters at the multiple depths, wherein the physical property curve is a relation curve of the well depth and the physical property parameters.
7. The apparatus for determining a physical property curve according to claim 6, wherein the second determining module includes:
the first acquisition unit is used for selecting one reference well from the plurality of reference wells as a target reference well;
the first determining unit is used for obtaining a relation curve of each auxiliary parameter and the physical property parameter of the target reference well according to the physical property parameter and each auxiliary parameter in the target depth range in the target reference well;
a second determination unit for determining a correlation coefficient of a relation curve of each auxiliary parameter of the target reference well and the physical property parameter;
a third determining unit, configured to determine, as the target auxiliary parameter, an auxiliary parameter with a highest correlation coefficient of a relationship curve with the physical property parameter among the n auxiliary parameters of the target reference well;
and the fourth determining unit is used for obtaining the target curve according to the physical property parameters and the target auxiliary parameters in the target depth range in the plurality of reference wells.
8. The apparatus for determining a physical property curve according to claim 6, further comprising:
a second obtaining module, configured to screen a standard well from the multiple reference wells, where the physical property parameter and the n auxiliary parameters of the standard well are both measured by using a high resolution induction HRIL method, or both the physical property parameter and the n auxiliary parameters of the standard well are measured by using a post-drilling logging method;
and the first processing module is used for carrying out standardization processing on the physical property parameters of the plurality of reference wells and the n auxiliary parameters, so that the most occupied values of the physical property parameters of other reference wells are the same as those of the standard wells, and the most occupied values of each auxiliary parameter are also the same, wherein the other reference wells are the reference wells except for the standard wells.
9. The apparatus for determining a physical property curve according to any one of claims 6 to 8, wherein the n auxiliary parameters include: lithology parameters and electrical parameters.
10. The apparatus for determining a physical property curve according to claim 6, wherein the well to be logged is a horizontal well, and the target depth range of the well to be logged is a depth range of a horizontal section in the horizontal well.
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