CN113123780B - Method and device for determining thickness of hydrocarbon source rock at each level of single well and storage medium - Google Patents
Method and device for determining thickness of hydrocarbon source rock at each level of single well and storage medium Download PDFInfo
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- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 180
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 180
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 178
- 238000000034 method Methods 0.000 title claims abstract description 37
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 26
- 239000010426 asphalt Substances 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 claims description 5
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Abstract
The disclosure provides a method and a device for determining thickness of hydrocarbon source rocks at all levels of a single well and a storage medium, and belongs to the field of hydrocarbon source rock research. The method comprises the following steps: acquiring a logging curve of a target well; determining the quality level of the hydrocarbon source rock of each well section in the target well based on the logging curve of the target well, wherein the well sections are obtained by dividing the target well along the depth; and determining the thicknesses of the hydrocarbon source rocks at each level of the target well based on the quality levels of the hydrocarbon source rocks at each well section in the target well. According to the method, the thicknesses of all levels of hydrocarbon source rocks of the single well can be determined according to the logging curve of the single well, and an implementation mode is provided for the research of the thicknesses of all levels of hydrocarbon source rocks; because the logging curve is related to the hydrocarbon source rock distribution of the well and is not limited by the hydrocarbon source rock distribution of other wells, the determination method is suitable for researching the thickness of heterogeneous hydrocarbon source rocks.
Description
Technical Field
The disclosure relates to the field of hydrocarbon source rock research, in particular to a method and a device for determining thickness of hydrocarbon source rock at each level of a single well and a storage medium.
Background
A source rock is a rock that is capable of producing or has produced mobile hydrocarbons. The size and distribution of the hydrocarbon source rock directly determines the size and distribution of the field. According to the quality level dividing standard of the source rock provided by the related technology, the source rock can be divided into high-quality source rock and effective source rock, and the TOC (Total Organic Carbon, organic carbon abundance) of the high-quality source rock is larger than that of the effective source rock.
In recent years, effective hydrocarbon source rocks and high-quality hydrocarbon source rocks are found in the green first segment, the tender first segment, the positive depression and sand trapping four upper subsections and the sand trapping three lower subsections of the Songling basin, the Liaohe depression and sand first segment, the sand trapping three segments, the mouth depression and sand trapping one segment and the sand three segments, and the thicknesses of the hydrocarbon source rocks (such as effective hydrocarbon source rocks and high-quality hydrocarbon source rocks) with different quality levels are studied. The distribution of the hydrocarbon source rocks has strong heterogeneity (namely lithology nonuniformity) due to the differences of the original deposition environments and the later evolution degrees of different areas and different layers, and the difficulty is brought to the research of the thicknesses of the hydrocarbon source rocks at all levels.
Disclosure of Invention
The embodiment of the disclosure provides a method, a device and a storage medium for determining the thickness of hydrocarbon source rocks at all levels of a single well, which can determine the thickness of the hydrocarbon source rocks at all levels of the single well according to a logging curve of the single well and provide an implementation mode for researching the thicknesses of the hydrocarbon source rocks at all levels. The technical scheme is as follows:
in a first aspect, a method for determining thickness of hydrocarbon source rocks at each level of a single well is provided, the method comprising:
acquiring a logging curve of a target well;
determining the quality level of the hydrocarbon source rock of each well section in the target well based on the logging curve of the target well, wherein the well sections are obtained by dividing the target well along the depth;
and determining the thicknesses of the hydrocarbon source rocks at each level of the target well based on the quality levels of the hydrocarbon source rocks at each well section in the target well.
Optionally, the log includes a sonic moveout curve and a resistivity curve, each extending along a depth of the target well,
the determining the quality level of the hydrocarbon source rock of each well section in the target well based on the logging curve of the target well comprises the following steps:
calculating organic carbon abundance TOC of each well section in the target well based on the logging curve of the target well,
and determining the quality level of the hydrocarbon source rock of each well section in the target well based on the TOC of each well section in the target well.
Optionally, the TOC of each well section in the target well is calculated according to the following formula:
TOC i ＝3.1823·lgR i +0.049·Δt i -13.7756，TOC i TOC, R for the ith interval i For the resistivity of the ith interval corresponding to the resistivity curve, deltat i And the acoustic time difference curve corresponds to the acoustic time difference of the ith well section.
Optionally, the determining the quality level of the hydrocarbon source rock of each well section in the target well based on the TOC of each well section in the target well includes:
when the TOC of the ith well section is 0.7% -1%, determining the quality level of the hydrocarbon source rock of the ith well section to be effective;
when TOC of the ith well section is 1% -2%, determining that the quality level of the hydrocarbon source rock of the ith well section is good;
when the TOC of the ith well section is more than 2%, determining the quality level of the hydrocarbon source rock of the ith well section to be high quality.
Optionally, the determining the thickness of each level of the source rock of the target well based on the quality level of the source rock of each well section in the target well includes:
and adding the depths of the well sections belonging to the same quality level of the source rock to obtain the thickness of the source rock belonging to the quality level of the source rock.
Optionally, the determining method further includes:
determining the thickness of each level of hydrocarbon source rock of each well in the exploration area where the target well is located;
and determining and outputting plane distribution information of the thicknesses of the hydrocarbon source rocks of all levels of the exploration area of the target well based on the thicknesses of the hydrocarbon source rocks of all levels of each well of the exploration area of the target well.
In a second aspect, a determining device for thickness of hydrocarbon source rock at each level of a single well is provided, the determining device comprising:
the first determining module is used for acquiring a logging curve of the target well;
the second determining module is used for determining the quality level of the hydrocarbon source rock of each well section in the target well based on the logging curve of the target well, wherein the well sections are obtained by dividing the target well along the depth;
and the third determining module is used for determining the thicknesses of the hydrocarbon source rocks at all levels of the target well based on the quality levels of the hydrocarbon source rocks at all well sections in the target well.
Optionally, the log includes a sonic moveout curve and a resistivity curve, each extending along a depth of the target well,
the second determining module is used for calculating organic carbon abundance TOC of each well section in the target well based on the logging curve of the target well; and determining the quality level of the hydrocarbon source rock of each well section in the target well based on the TOC of each well section in the target well.
Optionally, the second determination module calculates TOC for each well section in the target well according to the formula,
TOC i ＝3.1823·lgR i +0.049·Δt i -13.7756，TOC i TOC, R for the ith interval i For the resistivity of the ith interval corresponding to the resistivity curve, deltat i And the acoustic time difference curve corresponds to the acoustic time difference of the ith well section.
Optionally, the second determining module is configured to,
when the TOC of the ith well section is 0.7% -1%, determining the quality level of the hydrocarbon source rock of the ith well section to be effective;
when TOC of the ith well section is 1% -2%, determining that the quality level of the hydrocarbon source rock of the ith well section is good;
when the TOC of the ith well section is more than 2%, determining the quality level of the hydrocarbon source rock of the ith well section to be high quality.
Optionally, the third determining module is configured to,
and adding the depths of the well sections belonging to the same quality level of the source rock to obtain the thickness of the source rock belonging to the quality level of the source rock.
Optionally, the determining means further comprises an output module,
the output module is used for determining the thicknesses of all levels of hydrocarbon source rocks of all wells in the exploration area where the target well is located; and determining and outputting plane distribution information of the thicknesses of the hydrocarbon source rocks of all levels of the exploration area of the target well based on the thicknesses of the hydrocarbon source rocks of all levels of each well of the exploration area of the target well.
In a third aspect, there is provided an apparatus for determining the thickness of single-well, each stage hydrocarbon source rock comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor being configured to implement operations performed in the method for determining the thickness of single-well, each stage hydrocarbon source rock as described above when the computer program is executed.
In a fourth aspect, there is provided a storage medium having stored therein at least one instruction loaded and executed by a processor to effect the operations performed in the aforementioned single well, at each stage, hydrocarbon source rock thickness determination method.
The technical scheme provided by the embodiment of the disclosure has the beneficial effects that:
determining the well logging curve of the target well, determining the quality level of the hydrocarbon source rock of each well section in the target well based on the well logging curve of the target well, wherein the well sections are obtained by deep segmentation of the target well, and determining the thicknesses of all levels of the hydrocarbon source rock of the target well based on the quality level of the hydrocarbon source rock of each well section in the target well, so that the thicknesses of all levels of hydrocarbon source rock of a single well can be determined according to the well logging curve of the single well, and an implementation mode is provided for the research of the thicknesses of all levels of the hydrocarbon source rock; because the logging curve is related to the hydrocarbon source rock distribution of the well and is not limited by the hydrocarbon source rock distribution of other wells, the determination method is suitable for researching the thickness of heterogeneous hydrocarbon source rocks.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIGS. 1 and 2 are flowcharts of a method for determining the thickness of hydrocarbon source rocks at each level of a single well provided by embodiments of the present disclosure;
FIG. 3 is a schematic illustration of a log provided by an embodiment of the present disclosure;
FIG. 4 is a block diagram of a process (S) 1 +S 2 ) Schematic of relationship to TOC;
FIG. 5 is a schematic representation of chloroform bitumen "A" versus TOC provided by an embodiment of the present disclosure;
FIG. 6 is a schematic plan view of the thickness distribution of various levels of source rock for an exploration area provided by embodiments of the present disclosure;
fig. 7 and 8 are block diagrams of a device for determining thickness of hydrocarbon source rocks at each level of a single well according to an embodiment of the present disclosure.
Detailed Description
For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for determining a thickness of hydrocarbon source rock at each level of a single well according to an embodiment of the present disclosure. Referring to fig. 1, the determining method flow includes the following steps.
Step 101, acquiring a logging curve of a target well.
The logging curves comprise an acoustic moveout curve and a resistivity curve, and the acoustic moveout curve and the resistivity curve extend along the depth of the target well.
Step 102, determining the quality level of the hydrocarbon source rock of each well section in the target well based on the logging curve of the target well, wherein the well sections are obtained by dividing the target well along the depth.
And 103, determining the thicknesses of the hydrocarbon source rocks at all levels of the target well based on the quality levels of the hydrocarbon source rocks at all well sections in the target well.
In the embodiment of the disclosure, the quality level of the hydrocarbon source rock of each well section in the target well is determined by firstly determining the well logging curve of the target well and then determining the quality level of the hydrocarbon source rock of each well section in the target well based on the well logging curve of the target well, wherein the well sections are obtained by dividing the target well along the depth, and then determining the thicknesses of the hydrocarbon source rock of each level of the target well based on the quality level of the hydrocarbon source rock of each well section in the target well, so that the thicknesses of the hydrocarbon source rock of each level of the single well can be determined according to the well logging curve of the single well, and an implementation mode is provided for researching the thicknesses of the hydrocarbon source rock of each level; because the logging curve is related to the hydrocarbon source rock distribution of the well and is not limited by the hydrocarbon source rock distribution of other wells, the determination method is suitable for researching the thickness of heterogeneous hydrocarbon source rocks.
Fig. 2 is a flowchart of a method for determining a thickness of hydrocarbon source rock at each level of a single well according to an embodiment of the present disclosure. Referring to fig. 2, the determining method flow includes the following steps.
Step 201, acquiring a logging curve of a target well.
In this embodiment, the log curves include an acoustic moveout curve and a resistivity curve, both of which extend along the depth of the target well. FIG. 3 is a schematic illustration of a log provided by an embodiment of the present disclosure. Referring to fig. 3, in the log, GR represents a natural gamma curve, SP represents a natural potential curve, AC represents a sonic moveout curve of the log, the sonic moveout curve is obtained by sonic logging, RT represents a resistivity curve within the log parameters, and the resistivity curve is obtained by resistivity logging. Acoustic logging and resistivity logging are common well logging methods. The acoustic wave time difference may be a time difference of receiving the acoustic wave. The resistivity may be the resistivity of the rock (including the fluid therein).
Step 202, calculating TOC of each well section in the target well based on the logging curve of the target well.
The target well may be equally divided into multiple well segments, with a single well segment having a length (in the depth direction) of less than 1 meter, for example.
Because the hydrocarbon source rock sample has long test period and high cost, the connection distribution of the measured parameters of each well hydrocarbon source rock in the longitudinal direction (well depth) is difficult to obtain, and TOC has good correlation with a well logging curve, so that TOC can be calculated according to the characteristics of the well logging curve.
In the related art, a TOC calculation model is proposed, with toc=10 (2.297-0.168Ro) Δlgr, where Δlgr=lg (R/R Base line )+0.02(Δt/Δt Base line ) Ro is the measured value of the reflectivity of the lens body, R is the resistivity value corresponding to the measured TOC core, and Deltat is the acoustic time difference value corresponding to the measured TOC core.
In the TOC calculation model proposed in the related art, it is necessary to read the limit values (R Base line ，Δt Base line ) To avoid errors in read limit values, embodiments of the present disclosure provide a new TOC calculation model. For a pit or well, 10 (2.297-0.168Ro) 、lgR Base line 、Δt Base line As a constant, it is proposed at this time to change the TOC calculation model to toc=a·lgr+b·Δt+c. R is the resistivity value corresponding to the TOC core, and Ω·m; delta t is the acoustic time difference value corresponding to the TOC core, and mu s/ft; a. and b and c are fitting coefficients. The fitting coefficient can be obtained by regression analysis of the acoustic time difference and resistivity (log-taking values) log values of the measured TOC and the corresponding depth.
After regression analysis calculation, a can be 3.1823, b can be 0.049, c can be-13.7756, and the TOC calculation model after fitting is: toc= 3.1823 ·lgr+0.049·Δt-13.7756.
And calculating the TOC of a certain pit according to the TOC calculation model and performing regression analysis on the measured TOC. Referring to fig. 3, the measured TOC is shown by small circle black dots, the TOC calculated by the TOC calculation model is represented by line T, the measured TOC is not greatly different from the calculated TOC, and the calculated regression coefficient of the measured TOC and the calculated TOC is 0.89098, which indicates that the calculated TOC value has good correlation with the measured TOC, and indicates that the established logging calculation model is more reliable.
Illustratively, TOC i ＝3.1823·lgR i +0.049·Δt i -13.7756，TOC i TOC, R for the ith interval i For resistivity of the ith interval for the resistivity curve, Δt i The acoustic time difference curve corresponds to the acoustic time difference of the ith well section.
And 203, determining the quality level of the hydrocarbon source rock of each well section in the target well based on the TOC of each well section in the target well.
The quality level of the source rock for each well section in the target well may be determined according to the classification criteria provided by the related art. Illustratively, the quality level of the source rock of the ith interval is determined to be valid when the TOC of the ith interval is greater than 1% and less than 2%; when the TOC of the ith interval is equal to 2%, the quality level of the source rock of the ith interval is determined to be good.
In the embodiment of the disclosure, the classification mode of the hydrocarbon source rock is improved. The quality level of the source rock is set to be three sections, namely high-quality source rock, good source rock and effective source rock. The TOC of the high-quality source rock is more than 2%, the TOC of the good source rock is 1% -2%, and the TOC of the effective source rock is 0.7% -1%. It should be noted that, the TOC value range of each quality level does not include an endpoint, and for an endpoint (e.g., 1%) shared by two levels, the endpoint may be placed in either of the two levels (e.g., when the TOC is equal to 1%, the quality level of the source rock may be valid or good). Compared with the existing hydrocarbon source rock grading mode, the quality level is increased, so that the hydrocarbon source rock grading is finer, and the evaluation can be performed more accurately when the oil reservoir is evaluated. For example, well a has fewer good source rocks but more good source rocks, well B has more good source rocks but less good source rocks, and well a may be more developable than well B in the case of a particularly large good source rock volume.
Accordingly, step 203 may include: when the TOC of the ith well section is 0.7% -1%, determining the quality level of the hydrocarbon source rock of the ith well section to be effective; when TOC of the ith well section is 1% -2%, determining that the quality level of the hydrocarbon source rock of the ith well section is good; when the TOC of the ith well section is more than 2%, determining the quality level of the hydrocarbon source rock of the ith well section to be high quality.
Referring to fig. 3, in a depth range of 3900 to 4400 m of a certain pit, high quality source rock, good source rock, effective source rock, and ineffective source rock are sequentially arranged in a direction of increasing depth.
The following describes the basis for the division of the three quality classes (effective, good and premium source rock).
For the lower limit standard of the effective source rock, the lower limit standard can be determined by the analysis of the (S 1 (soluble hydrocarbon content) +S 2 (pyrolysis hydrocarbon content)) and the measured TOC. In the pyrolysis analysis (S 1 +S 2 ) Representing hydrocarbon potential is a comprehensive reflection of the generated hydrocarbons and hydrocarbon potential in the hydrocarbon source rock. Build measured TOC and (S) 1 +S 2 ) Has good correlation with the relation of the two. Measured TOC and (S) 1 +S 2 ) All from the same test recess or well. Table 1 below is a statistical table of geochemical parameters for a depressed hydrocarbon source rock provided in an embodiment of the present disclosure. As shown in Table 1, the recess included 125 measurement points, each corresponding to a different depth, S1, S2, chloroform bitumen "A" and TOC. FIG. 4 is a block diagram of a process (S) 1 +S 2 ) Schematic of relationship to TOC. Referring to FIG. 4, TOC is taken as the axis of abscissa, in (S 1 +S 2 ) The TOC and (S) in Table 1 are taken as the ordinate axes 1 +S 2 ) Values (shown by circles in fig. 4) are filled into the coordinate system. Fitting the values in the coordinate system to a straight line, it can be seen that as TOC decreases, (S 1 +S 2 ) The value decreases; when (S) 1 +S 2 ) When the value is 0, the hydrocarbon is not generated in the source rock, the possibility of hydrocarbon generation is not generated, and the corresponding TOC is the lower limit value of the effective source rock, namely the intersection point of the fitted straight line and the abscissa axis.
TABLE 1
For the lower limit standard of the high-quality source rock, the correlation between chloroform bitumen "A" and the measured TOC can be obtained. FIG. 5 is a schematic representation of chloroform bitumen "A" versus TOC as provided by an embodiment of the present disclosure. Referring to fig. 5, values of TOC and chloroform bitumen "a" in table 1 (shown by circles in fig. 5) are filled into the coordinate system with TOC as the abscissa axis and chloroform bitumen "a" as the ordinate axis. The outer envelope line (shown by the black curve in fig. 5) of the values in the coordinate system is determined, and it can be seen that when the hydrocarbon discharge amount appears to have a distinct inflection point along with the TOC increasing curve, this indicates that the hydrocarbon discharge amount of the hydrocarbon raw rock increases sharply at this time, and this inflection point is the lower limit of the quality hydrocarbon source rock. In the actual evaluation, since the hydrocarbon removal amount was found to be troublesome, it was expressed by chloroform bitumen "a" remaining in mudstone, and the inflection point at which the chloroform bitumen "a" no longer significantly increased was defined as the lower TOC limit of high-quality source rock on the curve of the relationship between the chloroform bitumen "a" content and TOC.
And for the lower limit standard of the good hydrocarbon source rock, referring to the land-phase oil rock organic matter abundance evaluation standard, and taking 1%.
Steps 202 and 203 achieve determining the quality level of the source rock for each well section in the target well based on the log of the target well.
Step 204, determining the thicknesses of the hydrocarbon source rocks at all levels of the target well based on the quality levels of the hydrocarbon source rocks at all well sections in the target well.
Step 204 may include: and adding the depths of the well sections belonging to the same quality level of the source rock to obtain the thickness of the source rock belonging to the quality level of the source rock. Thus, the effective source rock corresponds to a total thickness, the good source rock corresponds to a total thickness, and the good source rock corresponds to a total thickness.
Step 205, determining the thickness of each level of hydrocarbon source rock of each well in the exploration area where the target well is located.
The individual well individual levels of source rock thickness may be calculated according to the determination method provided in steps 201-204.
And 206, determining and outputting plane distribution information of the thicknesses of the hydrocarbon source rocks of all levels in the exploration area where the target well is located based on the thicknesses of the hydrocarbon source rocks of all levels of all wells in the exploration area where the target well is located.
The thickness plane distribution information of each level of hydrocarbon source rock in the exploration area of the target well can be displayed in a graph form. Step 206 may include: and for the hydrocarbon source rocks of each quality level, the thickness of the hydrocarbon source rocks of the corresponding quality level of the single well is used as a connecting point, and the connecting points of the same hydrocarbon source rock thickness are connected in a thickness contour map mode so as to draw a thickness plane distribution map of the hydrocarbon source rocks of the corresponding quality level of the exploration area where the target well is located. The connecting lines between connecting line points with the same thickness of the hydrocarbon source rock are closed circles, and the area of the closed circles is used for representing the plane distribution area of the hydrocarbon source rock with the corresponding thickness. FIG. 6 is a schematic plan view of the thickness distribution of various levels of source rock for an exploration area provided by embodiments of the present disclosure. Referring to fig. 6, the leftmost is a planar distribution of the thickness of the effective source rock, the middle is a planar distribution of the thickness of the good source rock, and the rightmost is a planar distribution of the thickness of the good source rock, all shown in contour.
The output mode comprises the step of displaying a thickness plane distribution map of the source rock with the corresponding quality level in the exploration area where the target well is located.
Fig. 7 is a block diagram of a device for determining the thickness of hydrocarbon source rocks at each level of a single well according to an embodiment of the disclosure. Referring to fig. 7, the determining apparatus 50 includes a first determining module 501, a second determining module 502, and a third determining module 503.
A first determination module 501 is configured to obtain a log of a target well.
A second determining module 502, configured to determine a quality level of the hydrocarbon source rock of each well section in the target well based on the log of the target well, where the well section is obtained by dividing the target well along the depth.
A third determining module 503 is configured to determine the thicknesses of the hydrocarbon source rocks at each level of the target well based on the quality levels of the hydrocarbon source rocks at each well section in the target well.
Illustratively, the log curves include a sonic moveout curve and a resistivity curve, both of which extend along the depth of the target well.
Accordingly, the second determining module 502 is configured to calculate the TOC of each well section in the target well based on the log of the target well; the quality level of the hydrocarbon source rock for each well section in the target well is determined based on the TOC for each well section in the target well.
Illustratively, the second determination module 502 calculates TOC, TOC for each well section in the target well according to the following formula i ＝3.1823·lgR i +0.049·Δt i -13.7756，TOC i TOC, R for the ith interval i For resistivity of the ith interval for the resistivity curve, Δt i The acoustic time difference curve corresponds to the acoustic time difference of the ith well section.
Illustratively, the second determining module 502 is configured to determine that the quality level of the source rock of the ith interval is valid when the TOC of the ith interval is 0.7% -1%; when TOC of the ith well section is 1% -2%, determining that the quality level of the hydrocarbon source rock of the ith well section is good; when the TOC of the ith well section is more than 2%, determining the quality level of the hydrocarbon source rock of the ith well section to be high quality.
Illustratively, the third determining module 503 is configured to add depths of well segments belonging to the same quality level of source rock to obtain a thickness of the source rock of the quality level of the source rock.
Illustratively, the determining device 50 also includes an output module 504.
The output module 504 is used for determining the thicknesses of the hydrocarbon source rocks at each level of each well in the exploration area where the target well is located; and determining and outputting plane distribution information of the thicknesses of the hydrocarbon source rocks of all levels in the exploration area of the target well based on the thicknesses of the hydrocarbon source rocks of all levels of each well in the exploration area of the target well.
In the embodiment of the disclosure, the quality level of the hydrocarbon source rock of each well section in the target well is determined by firstly determining the well logging curve of the target well and then determining the quality level of the hydrocarbon source rock of each well section in the target well based on the well logging curve of the target well, wherein the well sections are obtained by dividing the target well along the depth, and then determining the thicknesses of the hydrocarbon source rock of each level of the target well based on the quality level of the hydrocarbon source rock of each well section in the target well, so that the thicknesses of the hydrocarbon source rock of each level of the single well can be determined according to the well logging curve of the single well, and an implementation mode is provided for researching the thicknesses of the hydrocarbon source rock of each level; because the logging curve is related to the hydrocarbon source rock distribution of the well and is not limited by the hydrocarbon source rock distribution of other wells, the determination method is suitable for researching the thickness of heterogeneous hydrocarbon source rocks.
It should be noted that: the determination device for the thickness of the hydrocarbon source rock at each level of the single well provided in the foregoing embodiment only illustrates the division of each functional module when determining the thickness of the hydrocarbon source rock at each level of the single well, in practical application, the foregoing functional allocation may be completed by different functional modules according to needs, that is, the internal structure of the apparatus is divided into different functional modules, so as to complete all or part of the functions described above. In addition, the device for determining the thickness of the hydrocarbon source rock at each level of the single well provided in the foregoing embodiment belongs to the same concept as the embodiment of the method for determining the thickness of the hydrocarbon source rock at each level of the single well, and detailed implementation processes of the device are referred to as method embodiments, which are not repeated herein.
Fig. 8 is a block diagram of a device for determining the thickness of hydrocarbon source rocks at each level of a single well provided by an embodiment of the disclosure. Referring to fig. 8, the single well stage hydrocarbon source rock thickness determination device may be a computer 300. The computer 300 includes a Central Processing Unit (CPU) 301, a system memory 304 including a Random Access Memory (RAM) 302 and a Read Only Memory (ROM) 303, and a system bus 305 connecting the system memory 304 and the central processing unit 301. Computer 300 also includes a basic input/output system (I/O system) 306, which facilitates the transfer of information between the various devices within the computer, and a mass storage device 307 for storing an operating system 313, application programs 314, and other program modules 315.
The basic input/output system 306 includes a display 308 for displaying information and an input device 309, such as a mouse, keyboard, etc., for user input of information. Wherein both the display 308 and the input device 309 are coupled to the central processing unit 301 via an input output controller 310 coupled to the system bus 305. The basic input/output system 306 may also include an input/output controller 310 for receiving and processing input from a number of other devices, such as a keyboard, mouse, or electronic stylus. Similarly, the input output controller 310 also provides output to a display screen, a printer, or other type of output device.
The mass storage device 307 is connected to the central processing unit 301 through a mass storage controller (not shown) connected to the system bus 305. The mass storage device 307 and its associated computer-readable media provide non-volatile storage for the computer 300. That is, the mass storage device 307 may include a computer readable medium (not shown) such as a hard disk or CD-ROM drive.
Computer readable media may include computer storage media and communication media without loss of generality. Computer storage 13 media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes RAM, ROM, EPROM, EEPROM, flash memory or other solid state memory technology, CD-ROM, DVD or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices. Of course, those skilled in the art will recognize that computer storage media are not limited to the ones described above. The system memory 304 and mass storage device 307 described above may be collectively referred to as memory.
According to various embodiments of the invention, computer 300 may also operate by a remote computer connected to the network through a network, such as the Internet. I.e., computer 300 may be connected to a network 312 through a network interface unit 311 coupled to system bus 305, or alternatively, network interface unit 311 may be used to connect to other types of networks or remote computer systems (not shown).
The memory also includes one or more programs, one or more programs stored in the memory and configured to be executed by the CPU. The one or more programs include instructions for performing the method of determining the thickness of the hydrocarbon source rock for each stage of the single well shown in fig. 1 or 2.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The foregoing description of the preferred embodiments of the present disclosure is provided for the purpose of illustration only, and is not intended to limit the disclosure to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and principles of the disclosure.
Claims (10)
1. The method for determining the thickness of each level of hydrocarbon source rock of a single well is characterized by comprising the following steps:
acquiring a logging curve of a target well, wherein the logging curve comprises a sonic jet lag curve and a resistivity curve, and the sonic jet lag curve and the resistivity curve extend along the depth of the target well;
calculating organic carbon abundance TOC of each well section in the target well based on the logging curve of the target well;
determining the quality level of hydrocarbon source rocks of each well section in the target well based on TOC of each well section in the target well, wherein the well sections are obtained by dividing the target well along the depth;
determining the thickness of each level of hydrocarbon source rock of the target well based on the quality level of the hydrocarbon source rock of each well section in the target well;
wherein the determining the quality level of the hydrocarbon source rock of each well section in the target well based on the TOC of each well section in the target well comprises:
taking TOC as an abscissa axis and hydrocarbon generation potential as an ordinate axis, filling TOC and hydrocarbon generation potential values of each well section in the target well in a statistical table of hydrocarbon source rock geochemical parameters into the coordinate system and fitting the values into a straight line, and determining TOC corresponding to the intersection point position of the straight line and the abscissa axis as the TOC lower limit value of effective hydrocarbon source rock, wherein the hydrocarbon generation potential is the sum of soluble hydrocarbon content and pyrolytic hydrocarbon content;
taking TOC as an abscissa axis and chloroform asphalt 'A' as an ordinate axis, filling TOC and chloroform asphalt 'A' values of all well sections in a target well in a statistic table of geochemical parameters of the source rock into a coordinate system, determining a valued outer envelope curve in the coordinate system, and determining TOC corresponding to the inflection point position with the largest slope of the curve as the TOC lower limit value of high-quality source rock;
determining the TOC lower limit value of the hydrocarbon source rock according to the land oil rock organic matter abundance evaluation standard;
when TOC of the ith well section is more than 0.7% and less than 1%, determining the quality level of the hydrocarbon source rock of the ith well section as effective;
when TOC of the ith well section is more than 1% and less than 2%, determining that the quality level of the hydrocarbon source rock of the ith well section is good;
when the TOC of the ith well section is more than 2%, determining the quality level of the hydrocarbon source rock of the ith well section to be high quality.
2. The method of determining of claim 1, wherein the TOC for each well section in the target well is calculated according to the following equation:
TOC i ＝3.1823·lgR i +0.049·Δt i -13.7756，TOC i TOC, R for the ith interval i For the resistivity of the ith interval corresponding to the resistivity curve, deltat i And the acoustic time difference curve corresponds to the acoustic time difference of the ith well section.
3. The method of determining of claim 1, wherein determining each stage of source rock thickness for the target well based on the quality level of the source rock for each well section in the target well comprises:
and adding the depths of the well sections belonging to the same quality level of the source rock to obtain the thickness of the source rock belonging to the quality level of the source rock.
4. The determination method according to claim 1, characterized in that the determination method further comprises:
determining the thickness of each level of hydrocarbon source rock of each well in the exploration area where the target well is located;
and determining and outputting plane distribution information of the thicknesses of the hydrocarbon source rocks of all levels of the exploration area of the target well based on the thicknesses of the hydrocarbon source rocks of all levels of each well of the exploration area of the target well.
5. A device for determining the thickness of hydrocarbon source rocks at each level of a single well, the device comprising:
the first determining module is used for obtaining a logging curve of the target well, wherein the logging curve comprises a sonic jet lag curve and a resistivity curve, and the sonic jet lag curve and the resistivity curve extend along the depth of the target well;
the second determining module is used for calculating the organic carbon abundance TOC of each well section in the target well based on the logging curve of the target well; determining the quality level of hydrocarbon source rocks of each well section in the target well based on TOC of each well section in the target well, wherein the well sections are obtained by dividing the target well along the depth;
a third determining module, configured to determine thicknesses of hydrocarbon source rocks at each level of the target well based on quality levels of hydrocarbon source rocks at each well section in the target well;
wherein the determining the quality level of the hydrocarbon source rock of each well section in the target well based on the TOC of each well section in the target well comprises:
taking TOC as an abscissa axis and hydrocarbon generation potential as an ordinate axis, filling TOC and hydrocarbon generation potential values of each well section in the target well in a statistical table of hydrocarbon source rock geochemical parameters into the coordinate system and fitting the values into a straight line, and determining TOC corresponding to the intersection point position of the straight line and the abscissa axis as the TOC lower limit value of effective hydrocarbon source rock, wherein the hydrocarbon generation potential is the sum of soluble hydrocarbon content and pyrolytic hydrocarbon content;
taking TOC as an abscissa axis and chloroform asphalt 'A' as an ordinate axis, filling TOC and chloroform asphalt 'A' values of all well sections in a target well in a statistic table of geochemical parameters of the source rock into a coordinate system, determining a valued outer envelope curve in the coordinate system, and determining TOC corresponding to the inflection point position with the largest slope of the curve as the TOC lower limit value of high-quality source rock;
determining the TOC lower limit value of the hydrocarbon source rock according to the land oil rock organic matter abundance evaluation standard;
when TOC of the ith well section is more than 0.7% and less than 1%, determining the quality level of the hydrocarbon source rock of the ith well section as effective;
when TOC of the ith well section is more than 1% and less than 2%, determining that the quality level of the hydrocarbon source rock of the ith well section is good;
when the TOC of the ith well section is more than 2%, determining the quality level of the hydrocarbon source rock of the ith well section to be high quality.
6. The apparatus of claim 5, wherein the second determination module calculates TOC for each section of the target well according to the formula,
TOC i ＝3.1823·lgR i +0.049·Δt i -13.7756，TOC i TOC, R for the ith interval i For the resistivity of the ith interval corresponding to the resistivity curve, deltat i And the acoustic time difference curve corresponds to the acoustic time difference of the ith well section.
7. The apparatus according to claim 5, wherein the third determining module is configured to,
and adding the depths of the well sections belonging to the same quality level of the source rock to obtain the thickness of the source rock belonging to the quality level of the source rock.
8. The apparatus according to any one of claims 5 to 7, wherein the apparatus further comprises an output module,
the output module is used for determining the thicknesses of all levels of hydrocarbon source rocks of all wells in the exploration area where the target well is located; and determining and outputting plane distribution information of the thicknesses of the hydrocarbon source rocks of all levels of the exploration area of the target well based on the thicknesses of the hydrocarbon source rocks of all levels of each well of the exploration area of the target well.
9. A single well stage hydrocarbon source rock thickness determination apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor is configured to perform operations performed in the single well stage hydrocarbon source rock thickness determination method of any one of claims 1-4 when the computer program is executed.
10. A storage medium having stored therein at least one instruction loaded and executed by a processor to perform the operations performed in the method of determining the thickness of a single well, each level of hydrocarbon source rock of any one of claims 1 to 4.
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