CN103206208A - Method for macroscopically quantizing microscopic remaining oil in different occurrence states - Google Patents
Method for macroscopically quantizing microscopic remaining oil in different occurrence states Download PDFInfo
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Abstract
The invention discloses a method for macroscopically quantizing microscopic remaining oil in different occurrence states. The method includes the steps: acquiring a remaining oil reserve distribution field and a water saturation distribution field by macroscopic numerical simulation; determining the range of underground water saturation under the condition of different washing degrees according to washing degree differentiating standards and original water saturation, and obtaining macroscopic remaining oil reserve with different washing degrees according to the remaining oil reserve distribution field and the water saturation distribution field; determining the washing degree of a rock core in a current state by water saturation correction test for a coring well, determining the relative content of the microscopic remaining oil in different occurrence states by microscopic observation test for oily slices of the coring well, and counting to obtain the relative content of the microscopic remaining oil in different occurrence states under different washing degrees; and macroscopically quantizing the microscopic remaining oil by applying computation expression for microscopic remaining oil mass in different occurrence states according to the macroscopic remaining oil reserve with different washing degrees and the relative content of the microscopic remaining oil in different occurrence states under different washing degrees.
Description
Technical field
The invention belongs to technical field of petroleum extraction, relate in particular to the method that a kind of microcosmic different existence state remaining oil macroscopic view quantizes.
Background technology
Since the eighties in 20th century, the research remaining oil distribution has caused the common concern of each Oil Producing Countries of the world, and what and occurrence status thereof of remaining oil are the basic conditions that further improves recovery ratio.At present remaining oil research technology mainly is divided into two aspects: the one, between the reflection well, macroscopical remaining oil of interlayer remaining oil distribution; The 2nd, the microcosmic remaining oil of remaining oil distribution in the reflection rock pore structure.The macroscopic view remaining oil can use numerical simulation technology to accomplish quantification, and the microcosmic remaining oil can obtain by getting the analysis of core well oil-containing sheet, but its analysis result is the relative quantity based on oil-containing sheet, the i.e. shared percentage of different existence state remaining oil.As everyone knows, macroscopical remaining oil is made up of the microcosmic remaining oil of different existence state, and when macroscopical Fuel Oil Remaining one timing, the different existence state microcosmic remaining oil absolute magnitude that wherein comprises will be the key that determines oilfield well network adjustment, chemical flooding agent design.Because present remaining oil research technology method can't be known the absolute magnitude of different existence state remaining oil, therefore, when driving the agent design, use the method for laboratory core displacement test usually, be similar to " black box " theory, by experiment the anti-chemical system that mates with oil reservoir that pushes away of result.
The research method of microcosmic remaining oil can be divided into two aspects according to the difference of experimental facilities at present: the first kind is based on the relative amount that two-dimentional core wafer analysis obtains the different existence state remaining oil, and research method comprises casting body flake, ESEM, fluorescence microscope, glass etching oil displacement experiment etc.; Second class is based on three-dimensional little rock core and successively scans relative quantity and the absolute magnitude that afterwards obtains the different existence state remaining oil by image processing techniques, and research method comprises nanometer CT technology, nuclear magnetic resonance.
Based on the microcosmic remaining oil research technology that two-dimentional core wafer is analyzed, be merely able to obtain the relative amount of different existence state remaining oil, and the research precision is not high; Microcosmic remaining oil research technology based on the little core analysis of three-dimensional, though can study rock forming mineral and organic matter at three-dimensional perspective, and obtain relative quantity and the absolute magnitude of different existence state remaining oil by the image processing techniques after the scanning successively, but because the core sample that CT or nuclear-magnetism can scan and small, volume has only the millimeter level to the Centimeter Level size, and laboratory apparatus is expensive, therefore, this method can only not be suitable for the produced on-site practice as theoretical research at present.
The microcosmic remaining oil is to be trapped in the remaining oil in the rock pore structure with different existence state (membranaceous, bunch shape, corner shape etc.), because present research method all is from microcosmic angle, isolate mutually with macroscopical remaining oil, do not set up dependency relation with it, therefore, all can only obtain the relative quantity of different existence state microcosmic remaining oil or the absolute magnitude in the tiny sampler, also just can't characterize different existence state microcosmic remaining oil absolute magnitude size in the actual oil reservoir, and this absolute magnitude is the key that determines oilfield well network adjustment, chemical flooding agent design.
Summary of the invention
The invention provides the method that a kind of microcosmic different existence state remaining oil macroscopic view quantizes, be intended to solve the relative quantity that can only obtain different existence state microcosmic remaining oil at present or the absolute magnitude in the tiny sampler, can't characterize the problem of different existence state microcosmic remaining oil absolute magnitude size in the actual oil reservoir.
The method that the object of the present invention is to provide a kind of microcosmic different existence state remaining oil macroscopic view to quantize, this method may further comprise the steps:
Step 3, proofread and correct experiment by getting core well water saturation, determine core washing degree under the current state, by getting core well oil-containing sheet microscopic observation experiment, determine microcosmic different existence state remaining oil relative amount, and statistics draws the relative amount of different existence state microcosmic remaining oil under the different washing degrees;
Step 4 determines that with different existence state microcosmic remaining oil relative amount under different washing degrees macroscopic view remaining oil reserves and the different washing degrees be the microcosmic different existence state Fuel Oil Remaining calculation expression of function;
Step 5, the relative amount of different existence state microcosmic remaining oil under the different washing degrees macroscopic view remaining oil reserves of trying to achieve according to step 2 and the different washing degrees that the step 3 statistics draws, the microcosmic different existence state Fuel Oil Remaining calculation expression of applying step four carries out macroscopic view quantification to the microcosmic remaining oil.
Further, in step 1, by macroscopical numerical simulation, when obtaining remaining oil reserve distribution field and water saturation distribution field, be on oil reservoir fine description basis, use CMG reservoir numerical simulation software target reservoir is carried out semi-automatic production history match, and then obtain macroscopical remaining oil reserve distribution field and macroscopical water saturation distribution field data volume, concrete semi-automatic processing procedure is as follows:
The first step is determined adjustable reservoir parameter, comprising: permeability saturation curve (RP), permeability Kx, Ky, the Kz of X, Y, three directions of Z, conductivity Tx, Ty, the Tz of X, Y, three directions of Z, totally 7 parameters;
Second step, give weight of each parameter, the weight span is [0-100], with weight normalization, weighted value after the normalization is the adjusting range of this parameter, and the parameter after adjusting is applied to dope production fluid, oil productive capacity and the pressure maintenance level of present oil reservoir in the field data calculating;
The 3rd step, keep three parameters of level as the foundation of weight allocation next time with production fluid, oil productive capacity and pressure, if prediction liquid-producing capacity and pressure maintenance level are lower than actual conditions, then permeability saturation curve (RP) distributes big weight with Kx, Ky, if oil productive capacity is lower than actual conditions, permeability saturation curve (RP) distributes big weight, repeating for second step calculates, if three indexs of prediction conform to substantially with actual conditions, then finish weight allocation, stop to calculate.
Further, when adjusting permeability saturation curve (RP), if oil productive capacity is lower than actual conditions, then the adjustment of oil relative permeability forward increases, and the water relative permeability is oppositely adjusted and reduced; If oil productive capacity is higher than actual conditions, it is just the opposite then to adjust direction;
The adjusting range of permeability is limited, after the permeability adjusting range surpasses 50%, will turn to the adjustment conductivity automatically;
The weight setting can't be revised the permeability saturation curve form, needs the finger prosthesis phasing to the permeability curve form.
Further, this method is the grade classification index by the importing of residual oil quantitative analytical system water saturation and the remaining oil reserves parameter field of any time with the water saturation, calculates the remaining oil reserves between different dividing regions.
Further, described residual oil quantitative analytical system comprises:
Data acquisition module is used for receiving input data volume file, adopts the sequential organization algorithm for design to realize, judges wrong position and reason in the file input process, the relevant entry in the manual modification input data volume file, and read again;
The residual oil quantitative analysis module is connected with described data acquisition module, is used for receiving the data of described data collecting module collected, calculates each interval interior remaining oil reserves respectively with given criteria for classifying interval, and forms the standard output format;
The visualized data output module is connected with described residual oil quantitative analysis module, and the standard output format remaining oil reserves data volume that is used for generating is with form and the output of EXECL standard pie chart form.
Further, described data acquisition module and residual oil quantitative analysis module all adopt the sequential organization algorithm for design to realize.
Further, microcosmic remaining oil occurrence status adopts the experiment of sealed coring well oil-containing sheet laser confocal scanning to obtain, and detailed process is:
At first, adopt freezing tabletting technology, cut the grind away product at low temperature environment, original form of hole inner fluid is not destroyed when guaranteeing abrasive disc;
Secondly, body of casting automatic image-analysis microscope, petrographic microscope and fluorescence microscope are combined, utilize body of casting automatic image-analysis microscope to extract pore throat characteristic parameter, rock particles feature, the character of petrographic microscope identification mineral, fluorescence microscopy is chosen the Ultraluminescence filter, distinguish the profit border, finish the extraction of remaining oil occurrence status information with the residual oil quantitative analytical system, by observing fluoroscopic image the remaining oil distribution state in the hole is differentiated, characterized the feature of remaining oil micro Distribution with this result.
The method that microcosmic different existence state remaining oil macroscopic view provided by the invention quantizes by macroscopical numerical simulation, obtains remaining oil reserve distribution field and water saturation distribution field; Determine underground water saturation scope under the different washing degree conditions according to the washing degree criteria for classifying and original water saturation, and ask for different washing degrees macroscopic view remaining oil reserves in conjunction with remaining oil reserve distribution field and water saturation distribution field; Proofread and correct experiment by getting core well water saturation, determine core washing degree under the current state, by getting core well oil-containing sheet microscopic observation experiment, determine microcosmic different existence state remaining oil relative amount, and statistics draws the relative amount of different existence state microcosmic remaining oil under the different washing degrees; The relative amount of different existence state microcosmic remaining oil is used microcosmic different existence state Fuel Oil Remaining calculation expression the microcosmic remaining oil is carried out the macroscopic view quantification under the different washing degrees that draw according to the different washing degrees macroscopic view remaining oil reserves of trying to achieve and statistics; The present invention will organically combine based on microcosmic remaining oil oil-containing sheet analysis result and the numerical simulation macroscopic view remaining oil research technology result of laser confocal scanning, the macroscopic view that has realized different existence state microcosmic remaining oil quantizes, precision height, cost are low, satisfied the actual needs of oil field development, improved the research level of remaining oil, accuracy research from the conceptual research progress of non-quantitation is quantification has stronger popularization and using value.
Description of drawings
Fig. 1 is the realization flow figure of the method that quantizes of microcosmic different existence state remaining oil macroscopic view that the embodiment of the invention provides;
Fig. 2 is the distribution characteristics schematic diagram of the remaining oil reserve distribution field that provides of the embodiment of the invention;
Fig. 3 is the distribution characteristics schematic diagram of the water saturation distribution field that provides of the embodiment of the invention;
Fig. 4 is the main interface of the residual oil quantitative analytical system that provides of the embodiment of the invention;
Fig. 5 is the realization flow figure of data acquisition module in the residual oil quantitative analytical system that provides of the embodiment of the invention;
Fig. 6 is the realization flow figure of residual oil quantitative analysis module in the residual oil quantitative analytical system that provides of the embodiment of the invention;
Fig. 7 is the realization flow figure of visualized data output module in the residual oil quantitative analytical system that provides of the embodiment of the invention;
Fig. 8 is the target reservoir different layers position different washing degree macroscopic view remaining oil reserves ratio distribution map that the embodiment of the invention provides;
Fig. 9 is the operating principle flow chart of the residual oil quantitative analytical system that provides of the embodiment of the invention;
Figure 10 is the remaining oil microscopic fluorescence original image figure that the embodiment of the invention provides;
Figure 11 is that the employing threshold method that the embodiment of the invention provides is cut apart the back image graph;
Figure 12 is the remaining oil type identification that provides of embodiment of the invention figure as a result, and wherein, green portion is that water, pink colour partly are dissimilar remaining oils;
Figure 13 is all types of remaining oil microscopic pattern schematic diagrames behind two rivers oilfield water flooding of providing of the embodiment of the invention;
Figure 14 is the different existence state microcosmic remaining oil reserve distribution figure that the embodiment of the invention provides.
The specific embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further described in detail.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in and limit invention.
The realization flow of the method that the microcosmic different existence state remaining oil macroscopic view that Fig. 1 shows the embodiment of the invention to be provided quantizes.
This method may further comprise the steps:
Step 3, proofread and correct experiment by getting core well water saturation, determine core washing degree under the current state, by getting core well oil-containing sheet microscopic observation experiment, determine microcosmic different existence state remaining oil relative amount, and statistics draws the relative amount of different existence state microcosmic remaining oil under the different washing degrees;
Step 4 determines that with different existence state microcosmic remaining oil relative amount under different washing degrees macroscopic view remaining oil reserves and the different washing degrees be the microcosmic different existence state Fuel Oil Remaining calculation expression of function;
Step 5, the relative amount of different existence state microcosmic remaining oil under the different washing degrees macroscopic view remaining oil reserves of trying to achieve according to step 2 and the different washing degrees that the step 3 statistics draws, the microcosmic different existence state Fuel Oil Remaining calculation expression of applying step four carries out macroscopic view quantification to the microcosmic remaining oil.
In embodiments of the present invention, in step 1, by macroscopical numerical simulation, when obtaining remaining oil reserve distribution field and water saturation distribution field, be on oil reservoir fine description basis, use CMG reservoir numerical simulation software target reservoir is carried out semi-automatic production history match, and then obtain macroscopical remaining oil reserve distribution field and macroscopical water saturation distribution field data volume, concrete semi-automatic processing procedure is as follows:
The first step is determined adjustable reservoir parameter, comprising: permeability saturation curve (RP), permeability Kx, Ky, the Kz of X, Y, three directions of Z, conductivity Tx, Ty, the Tz of X, Y, three directions of Z, totally 7 parameters;
Second step, give weight of each parameter, the weight span is [0-100], with weight normalization, weighted value after the normalization is the adjusting range of this parameter, and the parameter after adjusting is applied to dope production fluid, oil productive capacity and the pressure maintenance level of present oil reservoir in the field data calculating;
The 3rd step, keep three parameters of level as the foundation of weight allocation next time with production fluid, oil productive capacity and pressure, if prediction liquid-producing capacity and pressure maintenance level are lower than actual conditions, then permeability saturation curve (RP) distributes big weight with Kx, Ky, if oil productive capacity is lower than actual conditions, permeability saturation curve (RP) distributes big weight, repeating for second step calculates, if three indexs of prediction conform to substantially with actual conditions, then finish weight allocation, stop to calculate.
In embodiments of the present invention, when adjusting permeability saturation curve (RP), if oil productive capacity is lower than actual conditions, then the adjustment of oil relative permeability forward increases, and the water relative permeability is oppositely adjusted and reduced; If oil productive capacity is higher than actual conditions, it is just the opposite then to adjust direction;
The adjusting range of permeability is limited, after the permeability adjusting range surpasses 50%, will turn to the adjustment conductivity automatically;
The weight setting can't be revised the permeability saturation curve form, needs the finger prosthesis phasing to the permeability curve form.
In embodiments of the present invention, this method is the grade classification index by the importing of residual oil quantitative analytical system water saturation and the remaining oil reserves parameter field of any time with the water saturation, calculates the remaining oil reserves between different dividing regions.
In embodiments of the present invention, the residual oil quantitative analytical system comprises:
Data acquisition module is used for receiving input data volume file, adopts the sequential organization algorithm for design to realize, judges wrong position and reason in the file input process, the relevant entry in the manual modification input data volume file, and read again;
The residual oil quantitative analysis module is connected with data acquisition module, is used for receiving the data of data collecting module collected, calculates each interval interior remaining oil reserves respectively with given criteria for classifying interval, and forms the standard output format;
The visualized data output module is connected with the residual oil quantitative analysis module, and the standard output format remaining oil reserves data volume that is used for generating is with form and the output of EXECL standard pie chart form.
In embodiments of the present invention, data acquisition module and residual oil quantitative analysis module all adopt the sequential organization algorithm for design to realize.
In embodiments of the present invention, microcosmic remaining oil occurrence status adopts the experiment of sealed coring well oil-containing sheet laser confocal scanning to obtain, and detailed process is:
At first, adopt freezing tabletting technology, cut the grind away product at low temperature environment, original form of hole inner fluid is not destroyed when guaranteeing abrasive disc;
Secondly, body of casting automatic image-analysis microscope, petrographic microscope and fluorescence microscope are combined, utilize body of casting automatic image-analysis microscope to extract pore throat characteristic parameter, rock particles feature, the character of petrographic microscope identification mineral, fluorescence microscopy is chosen the Ultraluminescence filter, distinguish the profit border, finish the extraction of remaining oil occurrence status information with the residual oil quantitative analytical system, by observing fluoroscopic image the remaining oil distribution state in the hole is differentiated, characterized the feature of remaining oil micro Distribution with this result.
Below in conjunction with drawings and the specific embodiments application principle of the present invention is further described.
The technic relization scheme that microcosmic different existence state remaining oil macroscopic view quantizes is as follows:
(1) at first carries out macroscopical numerical simulation study, obtain remaining oil reserve distribution field and water saturation distribution field;
(2) determine underground water saturation scope under the different washing degree conditions according to the washing degree criteria for classifying and original water saturation, and ask for different washing degrees macroscopic view remaining oil reserves in conjunction with remaining oil reserve distribution field and water saturation distribution field;
(3) carry out and get core well water saturation and proofread and correct experiment, determine core washing degree under the current state, carry out and get core well oil-containing sheet microscopic observation experiment, determine microcosmic different existence state remaining oil relative amount, and statistics draws the relative amount of different existence state microcosmic remaining oil under the different washing degrees;
(4) proposing with different existence state microcosmic remaining oil relative amount under different washing degrees macroscopic view remaining oil reserves and the different washing degrees is the microcosmic different existence state Fuel Oil Remaining calculation expression of function;
(5) the different washing degree macroscopic view remaining oil reserves and (3) of trying to achieve according to (2) step go on foot the relative amount of adding up different existence state microcosmic remaining oil under the different washing degrees that draw, and the microcosmic different existence state Fuel Oil Remaining calculation expression of using for (4) step quantizes the microcosmic remaining oil.
Fig. 1 is macroscopical quantization method realization flow figure of microcosmic different existence state remaining oil.Flow chart shows, the present invention is to be that the microcosmic different existence state remaining oil calculating formula of function is bridge with the washing degree, and macroscopical remaining oil research technology result and microcosmic remaining oil research technology result are combined, and obtains the microcosmic remaining oil and quantizes the result.Be example with the two river VI oil of Henan Oil Field group below, elaborate implementation of the present invention.
Obtaining of macroscopic field data:
On oil reservoir fine description basis, use CMG reservoir numerical simulation software target reservoir is carried out the production history match, and then obtain macroscopical remaining oil reserves field and macroscopical water saturation field data body.Obtaining of field data of the present invention is different with traditional artificial treatment mode, but semi-automatic processing mode, processing procedure is as follows:
(1) determines adjustable reservoir parameter, comprise, permeability saturation curve (RP), permeability Kx, Ky, the Kz of X, Y, three directions of Z, conductivity Tx, Ty, the Tz of X, Y, three directions of Z, totally 7 parameters;
(2) give weight of each parameter, the weight span is [0-100], and with weight normalization, the weighted value after the normalization is the adjusting range of this parameter, in the field data calculating with the parameter application after adjusting, can dope production fluid, oil productive capacity and the pressure maintenance level etc. of present oil reservoir;
(3) keep three parameters of level as the foundation of weight allocation next time with production fluid, oil productive capacity and pressure, if prediction liquid-producing capacity and pressure maintenance level are lower than actual conditions, then RP and Kx, Ky distribute big weight, if oil productive capacity is lower than actual conditions, RP distributes big weight, repeated for (2) step and calculate, if three indexs of prediction conform to substantially with actual conditions then finish weight allocation, stop to calculate.
This processing procedure need illustrate 3 points, the one, and the adjustment more complicated of permeability saturation curve, if when oil productive capacity is lower than actual conditions, then the oil relative permeability forward is adjusted (increase), the water relative permeability is oppositely adjusted (reducing); If oil productive capacity is higher than actual conditions, it is just the opposite then to adjust direction.The 2nd, the adjusting range of permeability is limited, therefore, after the permeability adjusting range surpasses 50%, will turn to the adjustment conductivity automatically.The 3rd, the weight setting can't be revised the permeability saturation curve form, therefore need artificial its form of appointment, so this method is referred to as semi-automatic processing mode.
Fig. 2, Fig. 3 are respectively reserves and the water saturation field distribution feature that adopts above-mentioned processing mode to obtain.
Different washing degree macroscopic view remaining oil reserves: the quantitative analysis because the CMG numerical simulation software can't be classified, for this reason, developed residual oil quantitative analytical system software NewStone OILANS v1.0.Software can realize importing water saturation and the remaining oil reserves parameter field of any time, is the grade classification index with the water saturation then, calculates the remaining oil reserves between different dividing regions, and Fig. 4 is residual oil quantitative analytical system software master interface.
The residual oil quantitative analytical system is divided into three modules: data acquisition module, residual oil quantitative analysis module, visualized data output module.
Data acquisition module: this module is mainly used to receive input data volume file, adopt the sequential organization algorithm for design to realize, program realization flow figure sees Fig. 5, judging in the file input process after wrong position and the reason can be by the relevant entry in the manual modification input data volume file, and reads again.
The residual oil quantitative analysis module: this module receives the data that data collecting module collected arrives, and with given criteria for classifying interval, calculates each interval interior remaining oil reserves respectively, and forms the standard output format.Adopt the sequential organization algorithm for design to realize that program realization flow figure sees Fig. 6.
The visualized data output module: this module is exported the standard output format remaining oil reserves data volume that generates with form and EXECL standard pie chart form, program realization flow figure sees Fig. 7.
According to the weak washing of determining, the corresponding oil reservoir water saturation value (0.52,0.68) of strong washing, use OILANS software and calculate target reservoir different layers position different washing degree macroscopic view remaining oil reserves forms (table 1), and reserves ratio distribution map (Fig. 8).
The different washing degree macroscopic view of table 1 remaining oil reserves
Microcosmic remaining oil occurrence status:
The microcosmic occurrence status of remaining oil adopts the experiment of sealed coring well oil-containing sheet laser confocal scanning to obtain.The general thought of experimental technique is: at first, adopt freezing tabletting technology, cut the grind away product at low temperature environment, original form of hole inner fluid can be not destroyed when guaranteeing abrasive disc; Secondly, be that body of casting automatic image-analysis microscope, petrographic microscope and fluorescence microscope are combined, comprehensive three's advantage, utilize body of casting automatic image-analysis microscope to extract pore throat characteristic parameter, rock particles feature, the character of petrographic microscope identification mineral, fluorescence microscopy is chosen the Ultraluminescence filter, distinguish the profit border, finish the extraction of remaining oil occurrence status information with the remaining oil analysis software, by observing fluoroscopic image the remaining oil distribution state in the hole is differentiated, characterized the feature of remaining oil micro Distribution with this result.
Analysis process:
Image capture: select high-sensitive colourful CCD video camera to gather R, G, B data image signal.
Color transformed: owing to R, G, B three colour spaces are linear, equivalent R, the G, the B that are zones of different are that brightness, colourity, saturation ratio are all different to people's visual experience, be unfavorable for that image cuts apart, therefore set up Mathematical Modeling between R, G, B and H, V, the C (brightness, colourity, saturation ratio), realize that R, G, B are to H, V, C conversion.
Color strengthens: adopt involution enhancing and histogram equalization.Select for use the valley point of R, G, B curve as coefficient, carry out the space and do the involution enhancing.
Color classification: utilize the value of R, G, B and the peak value of H curve to carry out color classification.
Image is cut apart: by color of image target is extracted.
Feature extraction: select suitable gray scale thresholding that target is separated from background by grey level histogram, and calculate oil area, contain water area, parameter such as remaining oil type ratio.
Image is cut apart: for remaining oil microscopic fluorescence image (as shown in figure 10), filemot part is crude oil, blue part seawater, the task that image is cut apart will extract crude oil (yellowish-brown) and water (blueness) exactly from the background of rock (dark color), yet carries out follow-up analytical work again.
Threshold method is a kind of traditional image partition method, cuts apart back image (as shown in figure 11), and purple is crude oil, and green is water, and the algorithm that the present invention adopts is global threshold partitioning algorithm and adaptive threshold partitioning algorithm.
Individual identification: after the above-mentioned image of process is cut apart, can from the microscopic fluorescence image, identify fuel-displaced and water, further from the foreground pixel of image, detect the oil of all single types.By size, shape, type and the area of statistics remaining oil, calculate the content of oil and water.But the shape of remaining oil and complex distribution in the actual conditions, as shown in figure 12, remaining oil continuous distributed overlapping or connect need detect the edge line of all single remaining oils from image.Therefore when carrying out the distributional analysis of remaining oil type, the rim detection that the higher algorithm of some automaticities carries out single remaining oil has been proposed.At present, weak linkage flag algorithm, corrosion propagation and principal curve cluster combine algorithm, spot detection algorithm etc. are arranged, but the analysis of these algorithms and inapplicable remaining oil.Adopted the algorithm with respect to the front that the very restraining growth algorithm of much progress is being arranged aspect automaticity and the rim detection effect.
Feature extraction: after the microcosmic remaining oil carried out individual identification, can extract independently remaining oil.In the bianry image that obtains, by the statistical computation object pixel, obtain the parameters such as size and dimension of remaining oil.Introduce below the remaining oil size and dimension analyze in CALCULATION OF PARAMETERS method commonly used (all with pixel be unit with undefined computational process).
(1) oil area: the quantity of namely adding up the corresponding foreground pixel of this remaining oil area;
(2) contain water area: the quantity of namely adding up the corresponding foreground pixel of this water;
(3) girth: the quantity of namely adding up remaining oil edge foreground pixel;
(4) remaining oil type.Namely add up the quantity of the corresponding foreground pixel of the type remaining oil;
(5) oil-water ratio: oil area and the ratio that contains the water surface;
(6) remaining oil type ratio: the ratio of the overall remaining oil in different remaining oil type places.
Reservoir microcosmic remaining oil type behind the oilfield water flooding of two rivers: carried out the laser confocal scanning experiment of 46 samples altogether, owing to reservoir micropore structure, exploitation water out behavior etc. there are differences, there is some difference for water drive exploitation back reservoir remaining oil distribution.Shuan He oil field VI oil group remaining oil type mainly comprises following several form (Figure 13) according to the observation: hole table film shape, particle adsorption-like, bunch shape, intergranular adsorption-like, corner shape.
Different washing degree core microcosmic remaining oil distribution features:
Get core well saturation correction result and show, strong water logging during each layer of oil reservoir position belongs to substantially, there is some difference for remaining oil distribution on the macroscopic view, and also there is some difference for different washing degree microcosmic remaining oils on the microcosmic.Added up the relative amount (table 2) of different washing degree different existence state microcosmic remaining oils in 46 core samples according to above-mentioned remaining oil treatment technology, whole rule shows as: along with washing degree increases, free state and bound state remaining oil are regular to be changed, along with washing degree increases, the hole table film shape of bound state increases gradually, the particle adsorption-like also is substantially and increases trend, and bunch shape remaining oil of free state reduces gradually.
The different washing degree different existence state of table 2 microcosmic remaining oil relative amount
Macroscopical quantized result of microcosmic different existence state remaining oil
Above obtained macroscopical absolute magnitude and the microcosmic relative quantity of remaining oil by the method for method for numerical simulation and microcosmos experiment, for the two organically being combined, done as giving a definition:
G
iMicrocosmic remaining oil reserves, unit: 10
4T;
G
jMacroscopic view remaining oil reserves, unit: 10
4T;
a
IjMicrocosmic remaining oil relative amount, unit, %;
I: remaining oil microcosmic occurrence status;
J: washing degree type;
Therefore: for the oil reservoir that j kind washing degree is arranged, the reserves of microcosmic remaining oil i in oil reservoir can be represented by the formula:
The following formula right side exists two variablees, wherein microcosmic remaining oil relative amount a
IjCan be obtained after normalization by table 2, table 3 is a after the normalization
IjBinary interaction factor table.
Table 3a
IjBinary interaction factor table
Macroscopic view remaining oil reserves G
jProvide (table 1) by first segment macroscopic view remaining oil research technology result, so far, just can ask for target reservoir different existence state microcosmic remaining oil reserves (table 4).Contrast different existence state microcosmic remaining oil reserves are found (Figure 14), because this oil reservoir washing degree height, the remaining oil in the oil reservoir only has a small amount of bunch of shape remaining oil based on hole table film shape, corner shape, intergranular adsorption-like and particle adsorption-like.Because the washing degree difference of different layers position, therefore, different existence state microcosmic remaining oil proportion also is not quite similar.
Table 4 different existence state microcosmic remaining oil reserves
The method that the microcosmic different existence state remaining oil macroscopic view that the embodiment of the invention provides quantizes by macroscopical numerical simulation, obtains remaining oil reserve distribution field and water saturation distribution field; Determine underground water saturation scope under the different washing degree conditions according to the washing degree criteria for classifying and original water saturation, and ask for different washing degrees macroscopic view remaining oil reserves in conjunction with remaining oil reserve distribution field and water saturation distribution field; Proofread and correct experiment by getting core well water saturation, determine core washing degree under the current state, by getting core well oil-containing sheet microscopic observation experiment, determine microcosmic different existence state remaining oil relative amount, and statistics draws the relative amount of different existence state microcosmic remaining oil under the different washing degrees; The relative amount of different existence state microcosmic remaining oil is used microcosmic different existence state Fuel Oil Remaining calculation expression the microcosmic remaining oil is carried out the macroscopic view quantification under the different washing degrees that draw according to the different washing degrees macroscopic view remaining oil reserves of trying to achieve and statistics; The present invention will organically combine based on microcosmic remaining oil oil-containing sheet analysis result and the numerical simulation macroscopic view remaining oil research technology result of laser confocal scanning, the macroscopic view that has realized different existence state microcosmic remaining oil quantizes, precision height, cost are low, satisfied the actual needs of oil field development, improved the research level of remaining oil, accuracy research from the conceptual research progress of non-quantitation is quantification has stronger popularization and using value.
Below only be preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the method that quantizes of microcosmic different existence state remaining oil macroscopic view is characterized in that this method may further comprise the steps:
Step 1 by macroscopical numerical simulation, obtains remaining oil reserve distribution field and water saturation distribution field;
Step 2 is determined underground water saturation scope under the different washing degree conditions according to the washing degree criteria for classifying and original water saturation, and asks for different washing degrees macroscopic view remaining oil reserves in conjunction with remaining oil reserve distribution field and water saturation distribution field;
Step 3, proofread and correct experiment by getting core well water saturation, determine core washing degree under the current state, by getting core well oil-containing sheet microscopic observation experiment, determine microcosmic different existence state remaining oil relative amount, and statistics draws the relative amount of different existence state microcosmic remaining oil under the different washing degrees;
Step 4 determines that with different existence state microcosmic remaining oil relative amount under different washing degrees macroscopic view remaining oil reserves and the different washing degrees be the microcosmic different existence state Fuel Oil Remaining calculation expression of function;
Step 5, the relative amount of different existence state microcosmic remaining oil under the different washing degrees macroscopic view remaining oil reserves of trying to achieve according to step 2 and the different washing degrees that the step 3 statistics draws, the microcosmic different existence state Fuel Oil Remaining calculation expression of applying step four carries out macroscopic view quantification to the microcosmic remaining oil.
2. the method for claim 1, it is characterized in that, in step 1, by macroscopical numerical simulation, when obtaining remaining oil reserve distribution field and water saturation distribution field, be on oil reservoir fine description basis, use CMG reservoir numerical simulation software target reservoir is carried out semi-automatic production history match, and then obtain macroscopical remaining oil reserve distribution field and macroscopical water saturation distribution field data volume, concrete semi-automatic processing procedure is as follows:
The first step is determined adjustable reservoir parameter, comprising: permeability saturation curve (RP), permeability Kx, Ky, the Kz of X, Y, three directions of Z, conductivity Tx, Ty, the Tz of X, Y, three directions of Z, totally 7 parameters;
Second step, give weight of each parameter, the weight span is [0-100], with weight normalization, weighted value after the normalization is the adjusting range of this parameter, and the parameter after adjusting is applied to dope production fluid, oil productive capacity and the pressure maintenance level of present oil reservoir in the field data calculating;
The 3rd step, keep three parameters of level as the foundation of weight allocation next time with production fluid, oil productive capacity and pressure, if prediction liquid-producing capacity and pressure maintenance level are lower than actual conditions, then permeability saturation curve (RP) distributes big weight with Kx, Ky, if oil productive capacity is lower than actual conditions, permeability saturation curve (RP) distributes big weight, repeating for second step calculates, if three indexs of prediction conform to substantially with actual conditions, then finish weight allocation, stop to calculate.
3. method as claimed in claim 2 is characterized in that, when adjusting permeability saturation curve (RP), if oil productive capacity is lower than actual conditions, then the adjustment of oil relative permeability forward increases, and the water relative permeability is oppositely adjusted and reduced; If oil productive capacity is higher than actual conditions, it is just the opposite then to adjust direction;
The adjusting range of permeability is limited, after the permeability adjusting range surpasses 50%, will turn to the adjustment conductivity automatically;
The weight setting can't be revised the permeability saturation curve form, needs the finger prosthesis phasing to the permeability curve form.
4. the method for claim 1, it is characterized in that, this method is the grade classification index by the importing of residual oil quantitative analytical system water saturation and the remaining oil reserves parameter field of any time with the water saturation, calculates the remaining oil reserves between different dividing regions.
5. method as claimed in claim 4 is characterized in that, described residual oil quantitative analytical system further comprises:
Data acquisition module is used for receiving input data volume file, adopts the sequential organization algorithm for design to realize, judges wrong position and reason in the file input process, the relevant entry in the manual modification input data volume file, and read again;
The residual oil quantitative analysis module is connected with described data acquisition module, is used for receiving the data of described data collecting module collected, calculates each interval interior remaining oil reserves respectively with given criteria for classifying interval, and forms the standard output format;
The visualized data output module is connected with described residual oil quantitative analysis module, and the standard output format remaining oil reserves data volume that is used for generating is with form and the output of EXECL standard pie chart form.
6. method as claimed in claim 5 is characterized in that, described data acquisition module and residual oil quantitative analysis module all adopt the sequential organization algorithm for design to realize.
7. the method for claim 1 is characterized in that, microcosmic remaining oil occurrence status adopts the experiment of sealed coring well oil-containing sheet laser confocal scanning to obtain, and detailed process is:
At first, adopt freezing tabletting technology, cut the grind away product at low temperature environment, original form of hole inner fluid is not destroyed when guaranteeing abrasive disc;
Secondly, body of casting automatic image-analysis microscope, petrographic microscope and fluorescence microscope are combined, utilize body of casting automatic image-analysis microscope to extract pore throat characteristic parameter, rock particles feature, the character of petrographic microscope identification mineral, fluorescence microscopy is chosen the Ultraluminescence filter, distinguish the profit border, finish the extraction of remaining oil occurrence status information with the residual oil quantitative analytical system, by observing fluoroscopic image the remaining oil distribution state in the hole is differentiated, characterized the feature of remaining oil micro Distribution with this result.
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