CN105551004A - Core CT image processing-based remaining oil micro-occurrence representing method - Google Patents
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Abstract
The invention relates to the field of petroleum reservoir and image processing, in particular to a core CT image processing-based remaining oil micro-occurrence representing method. The method comprises the following steps: pre-processing of a CT image: carrying out CT image interpolation on the basis of three Lagrange interpolations; image segmentation and modification; CT image-based pore and throat network modeling and quantitative characterization of remaining oil micro-occurrence. According to the core CT image processing-based remaining oil micro-occurrence representing method, the steps of CT image pre-processing, image interpolation, image-based medium segmentation, core model three-dimensional reconstruction, pore/throat segmentation and pore/throat topological structure reconstruction are carried out to obtain the three-dimensional configurations of all the pores and throats as well as the topological connection relation among the three-dimensional configurations, and finally obtain the quantitative characterization of the remaining oil micro-occurrence.
Description
Technical field
The present invention relates to the field such as petroleum reservoir, image procossing, be specifically related to the tax of a kind of remaining oil microcosmic based on rock core CT image procossing and deposit method for expressing.
Background technology
Many macroscopic properties (as permeability, capillary pressure etc.) due to reservoir all depend on its micromechanism.Therefore, realize the development goal increasing substantially oil recovery factor, its theoretical research and technological development can not only stop on a macroscopic level, must be deep into the preserving of oil, space of migrating---and porous medium is inner, conducts a research from microcosmic point.
Only have by determining on porous medium inside that the essential problem of fluid macroscopic view flow phenomenon conducts a research (as the distribution wherein of the impact of the topology distribution convection cell seepage flow of pore space, fluid and the mechanism etc. that influences each other), fundamentally could be familiar with the contact of micro-mobility protocols, on this basis, really could find the correct direction that research improves oil recovery factor technology and the technological means that should take, provide for taking advanced reasonably measure instruct foundation reliably to improve oil recovery rate.Before this, in High water cut reservoir, the microscopic mechanism of oil and water zonation carrys out qualitative examination mostly by experiment, and therefore, the tax that research obtains is deposited and migration theory still stops on a macroscopic scale, and a lot of microscopic mechanism is not revealed.
So, be necessary to rely on advanced Computer Analysis means and algorithm and physical simulation experiment technology, ultra-high water cut reservoir remaining oil microcosmic occurrence status is furtherd investigate, reach the combination of qualitative understanding and quantitative description, provide for taking advanced rational approach instruct foundation reliably to improve oil recovery rate.
Summary of the invention
For solving shortcoming and defect of the prior art, the present invention proposes the tax of a kind of remaining oil microcosmic based on rock core CT image procossing and deposit method for expressing, the present invention with ultra-high water cut stage sandstone oil reservoir rock for research object, by high precision CT microcosmic testing and analyzing technology, by composing the research of storage and occurrence status to remaining oil in porous medium inner pore, venturi, set up analysis of experiments technology and the characterizing method of remaining oil under CT micron order yardstick.Its technical scheme adopted is as follows:
Remaining oil microcosmic based on rock core CT image procossing is composed and is deposited a method for expressing, it is characterized in that: comprise the steps:
Step 1, the process of CT image, comprises CT Image semantic classification, interpolation operation, Iamge Segmentation;
Step 2, modeling is carried out to hole, venturi network in the basis of CT image procossing;
Step 3, remaining oil microcosmic composes the quantitative statistics deposited;
Step 4, remaining oil microcosmic composes the state representation deposited.
In described step 1, the process of CT image comprises:
(1) mainly first contrast strengthen and sharpening two aspect pre-service are carried out to the image obtained;
(2) suitable interpolation operation is carried out to sectioning image, generate new image in sectioning image intermediate interpolated equal with plane picture resolution sizes to ensure the spacing between image layer;
(3) hole in microscopic flooding image and remaining oil can be partitioned into by means of image Segmentation Technology.
Described hole, venturi network modelling are the results based on CT image procossing, for analyzing and show the structural information of rock.First, difference is carried out to the two-dimensional ct scan image obtained and obtain 3 d data field; Then utilize MarchingCube (MC) algorithm to carry out 3-D data volume structure, and complete the statistics of the visual of 3-D view and remaining oil information on this basis; Next, create hole, the venturi network model containing topology information, thus realize the description of remaining oil microscopic void rank.
Described remaining oil microcosmic is composed the quantitative statistics deposited and is comprised remaining oil microcosmic and compose the block number of storage, volume and surface area.Wherein remaining oil microcosmic composes the block number of storage, volume utilizes materials different in core data body to carry out adding up with the principle that gray-scale value carries out distinguishing and divide.Wherein, the gray-scale value of matrix rock core is 0, and the gray-scale value of water is 255, and the gray-scale value of remaining oil is 128.Therefore, want the block number and the volume information that obtain remaining oil, only need the voxel that gray-scale value is 128 be added up.
Utilize marching cubes algorithm can make discrete 3-D data volume serialization, therefore remaining oil surface is become the polygon of relative smooth from cube, when statistical form area according to the number order of remaining oil, for the remaining oil being numbered i, its each voxel is searched for.If all voxels with this voxel with 26 connected relations are oil, then show that this voxel is positioned at remaining oil really inner, it is not added up; If certain voxel be adjacent is rock particles, then adds up the contact area between these two voxels and be added in remaining oil area and contact area; If certain adjacent voxel is water, then adds up the contact area between these two voxels and be added in remaining oil area.The surface area that can obtain the remaining oil being numbered i after statistics terminates is set to S
1(i) and be set to S with the contact area of rock surface
2(i).
Described remaining oil microcosmic is composed the state representation description of depositing and is comprised remaining oil microcosmic tax storage, composes and deposits position and occurrence patterns.For carrying out quantitatively characterizing to the tax storage of remaining oil further, the average external volume of definition remaining oil is:
In formula:
for the average external volume of remaining oil, N is residue oil clot number, v
iit is the volume of i-th block of remaining oil.By to residue oil clot number and the comprehensive analysis of remaining oil average external volume, can the tax storage of remaining oil in quantitatively characterizing remaining oil displacement process.
Carry out quantitatively characterizing for depositing position to the tax of remaining oil further, definition contact area rate C is:
In formula, C-contact area rate, S
2the contact area of (i)-remaining oil and hole, S
1the surface area of (i)-remaining oil.The contact area of remaining oil is the number percent that the contact area of remaining oil and hole accounts for remaining oil total surface area, and this index reflects the relative position relation between remaining oil and pore surface.Contact area rate is less, and to show that remaining oil is attached to the ratio of pore surface less, and corresponding waterflooding effect is also better.
For the occurrence patterns of quantitative description remaining oil, the form factor G of definition remaining oil is:
G＝V/S
1.5
In formula, the volume of V-monolithic remaining oil, the surface area of S-monolithic remaining oil.From the definition of remaining oil form factor, form factor is less, and in same volume situation, the surface area of remaining oil is larger, and concave-convex surface intensity of variation is also larger, and its shape is more irregular.With the size of form factor for the criteria for classifying, the remaining oil in each displacement stage is divided into single hole shape, oil film shape, vesicular and shape Four types in flakes.
Beneficial effect: a kind of remaining oil microcosmic based on rock core CT image procossing is composed and deposited method for expressing, the tax overcoming existing research is deposited and migration theory still stops on a macroscopic scale, the not revealed shortcoming of a lot of microscopic mechanism, by CT Image semantic classification, longitudinal image interpolation, medium based on image is split, core model three-dimensional reconstruction, the steps such as pore throat segmentation and the reconstruction of pore throat topological structure, obtain the three-dimensional configuration of all holes and venturi in core model and mutual topological connection relation thereof, propose remaining oil microcosmic and compose the quantitatively characterizing index of depositing, in conjunction with the distribution situation of remaining oil in different phase rock core sample, to the profit shape in rock core sample mesoporosity and venturi, distribution pattern, migration rules etc. are added up, the Qualitative and quantitative analysis research of remaining oil microcosmic occurrence status influence factor can be obtained on this basis, there is provided instruct foundation reliably to improve oil recovery rate.
Accompanying drawing explanation
Fig. 1 is overview flow chart of the present invention;
Fig. 2 is mesoporosity of the present invention, venturi mesh modeling process flow diagram;
Fig. 3 remains oil clot number and volume statistical flowsheet figure in the present invention;
Fig. 4 is remaining oil surface area statistical flowsheet figure in the present invention;
Fig. 5 is remaining oil numbering schematic diagram in the present invention;
Fig. 6 remains oil clot number and monolithic remaining oil average external volume statistics schematic diagram in the present invention;
Fig. 7 is that in the present invention, position view is deposited in different displacement moment remaining oil tax;
Fig. 8 is saturated oil moment diverse location section remaining oil occurrence status schematic diagram in the present invention.
Embodiment
Below by specific embodiment, to the present invention, the present invention is described in detail.
As shown in Figure 1, method for expressing is deposited in the remaining oil microcosmic tax that the present invention is based on rock core CT image procossing, comprising: the process of CT image, modeling is carried out to hole, venturi network in the basis of CT image procossing, remaining oil microcosmic composes the quantitative statistics deposited, and remaining oil microcosmic composes the state representation deposited.
In FIG, the process of CT image comprises:
(1) mainly first contrast strengthen and sharpening two aspect pre-service are carried out to the image obtained;
(2) suitable interpolation operation is carried out to sectioning image, generate new image in sectioning image intermediate interpolated equal with plane picture resolution sizes to ensure the spacing between image layer;
(3) hole in microscopic flooding image and remaining oil can be partitioned into by means of image Segmentation Technology.
In fig. 2, Fig. 2 is mesoporosity of the present invention, venturi mesh modeling process flow diagram.Hole, venturi network modelling are the results based on CT image procossing, to analyze and to show the structural information of rock more intuitively.Concrete steps are: first, carry out difference obtain 3 d data field to the two-dimensional ct scan image obtained; Then utilize MarchingCube (MC) algorithm to carry out 3-D data volume structure, and complete the statistics of the visual of 3-D view and remaining oil information on this basis; Next, create hole, the venturi network model containing topology information, thus realize the description of remaining oil microscopic void rank.
In figure 3 with in Fig. 4, Fig. 3 remains oil clot number and volume statistical flowsheet map flow chart in the present invention, and Fig. 4 is remaining oil surface area statistical flowsheet figure in the present invention.Remaining oil microcosmic composes the quantitative statistics deposited, and comprises the block number of remaining oil microcosmic tax storage, volume and surface area.Wherein remaining oil microcosmic composes the block number of storage, volume utilizes materials different in core data body to carry out adding up with the principle that gray-scale value carries out distinguishing and divide.Wherein, the gray-scale value of matrix rock core is 0, and the gray-scale value of water is 255, and the gray-scale value of remaining oil is 128.Therefore, want the block number and the volume information that obtain remaining oil, only need add up the voxel that gray-scale value is 128, result as shown in Figure 5.
Utilize marching cubes algorithm can make discrete 3-D data volume serialization, therefore remaining oil surface is become the polygon of relative smooth from cube, when statistical form area according to the number order of remaining oil, for the remaining oil being numbered i, its each voxel is searched for.If all voxels with this voxel with 26 connected relations are oil, then show that this voxel is positioned at remaining oil really inner, it is not added up; If certain voxel be adjacent is rock particles, then adds up the contact area between these two voxels and be added in remaining oil area and contact area; If certain adjacent voxel is water, then adds up the contact area between these two voxels and be added in remaining oil area.The surface area that can obtain the remaining oil being numbered i after statistics terminates is set to S
1(i) and be set to S with the contact area of rock surface
2(i).
Remaining oil microcosmic composes the state representation deposited, and comprises microcosmic and composes storage, compose the description of depositing position and occurrence patterns.
As shown in Figure 6, Fig. 6 remains oil clot number and monolithic remaining oil average external volume statistics schematic diagram in the present invention, for carrying out quantitatively characterizing to the tax storage of remaining oil further, the average external volume of definition remaining oil is:
In formula:
for the average external volume of remaining oil, N is residue oil clot number, v
iit is the volume of i-th block of remaining oil.By to residue oil clot number and the comprehensive analysis of remaining oil average external volume, can the tax storage of remaining oil in quantitatively characterizing remaining oil displacement process.
As shown in Figure 7, Fig. 7 is that in the present invention, position view schematic diagram is deposited in different displacement moment remaining oil tax.Carry out quantitatively characterizing for depositing position to the tax of remaining oil further, definition contact area rate C is:
In formula, C-contact area rate, S
2the contact area of (i)-remaining oil and hole, S
1the surface area of (i)-remaining oil.The contact area of remaining oil is the number percent that the contact area of remaining oil and hole accounts for remaining oil total surface area, and this index reflects the relative position relation between remaining oil and pore surface.Contact area rate is less, and to show that remaining oil is attached to the ratio of pore surface less, and corresponding waterflooding effect is also better.
As shown in Figure 8, Fig. 8 is saturated oil moment diverse location section remaining oil occurrence status schematic diagram in the present invention.For the occurrence patterns of quantitative description remaining oil, the form factor G of definition remaining oil is:
G＝V/S
1.5
In formula, the volume of V-monolithic remaining oil, the surface area of S-monolithic remaining oil.From the definition of remaining oil form factor, form factor is less, and in same volume situation, the surface area of remaining oil is larger, and concave-convex surface intensity of variation is also larger, and its shape is more irregular.With the size of form factor for the criteria for classifying, the remaining oil in each displacement stage is divided into single hole shape, oil film shape, vesicular and shape Four types in flakes.
A kind of remaining oil microcosmic based on rock core CT image procossing of the present invention is composed and deposited method for expressing is on the basis obtaining rock core CT scan image, by CT Image semantic classification, longitudinal image interpolation, medium based on image is split, core model three-dimensional reconstruction, the steps such as pore throat segmentation and the reconstruction of pore throat topological structure, obtain the three-dimensional configuration of all holes and venturi in core model and mutual topological connection relation thereof, propose remaining oil microcosmic and compose the quantitatively characterizing description of depositing, can study the Qualitative and quantitative analysis of remaining oil microcosmic occurrence status influence factor, there is provided instruct foundation reliably to improve oil recovery rate.
Claims (5)
1. a method for expressing is deposited in the remaining oil microcosmic tax based on rock core CT image procossing, it is characterized in that: comprise the steps:
Step 1, the process of CT image, comprises CT Image semantic classification, interpolation operation, Iamge Segmentation;
Step 2, modeling is carried out to hole, venturi network in the basis of CT image procossing;
Step 3, remaining oil microcosmic composes the quantitative statistics deposited;
Step 4, remaining oil microcosmic composes the state representation deposited.
2. a kind of remaining oil microcosmic based on rock core CT image procossing according to claim 1 is composed and is deposited method for expressing, it is characterized in that: in step 1, the process of CT image comprises:
(1) mainly first contrast strengthen and sharpening two aspect pre-service are carried out to the image obtained;
(2) suitable interpolation operation is carried out to sectioning image, generate new image in sectioning image intermediate interpolated equal with plane picture resolution sizes to ensure the spacing between image layer;
(3) hole in microscopic flooding image and remaining oil can be partitioned into by means of image Segmentation Technology.
3. a kind of remaining oil microcosmic based on rock core CT image procossing according to claim 1 is composed and is deposited method for expressing, it is characterized in that: hole, venturi network modelling are the results based on CT image procossing, for analyzing and show the structural information of rock.
4. a kind of remaining oil microcosmic based on rock core CT image procossing according to claim 1 is composed and is deposited method for expressing, it is characterized in that: remaining oil microcosmic is composed the quantitative statistics deposited and comprised the block number of remaining oil microcosmic tax storage, volume and surface area.
5. a kind of remaining oil microcosmic based on rock core CT image procossing according to claim 1 is composed and is deposited method for expressing, it is characterized in that: remaining oil microcosmic is composed the state representation description of depositing and comprised remaining oil microcosmic tax storage, composes and deposits position and occurrence patterns.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105954496A (en) * | 2016-06-13 | 2016-09-21 | 中国石油天然气股份有限公司 | Method for reconstructing pore throat and fluid distribution of sandstone reservoir |
| CN106596352A (en) * | 2016-12-13 | 2017-04-26 | 北京科技大学 | Compound eye-type image acquisition apparatus used for high-temperature microscopic seepage experiment and analysis method thereof |
| CN108104806A (en) * | 2017-12-14 | 2018-06-01 | 中国石油化工股份有限公司 | Remaining Oil Distribution quantitative analysis method |
| CN108678738A (en) * | 2018-06-02 | 2018-10-19 | 东北石油大学 | The method for determining matrix-high infiltration strip functional form remaining oil of polymer flooding distribution and migration rule with fractal theory |
| CN108825222A (en) * | 2018-06-02 | 2018-11-16 | 东北石油大学 | The method for determining the distribution of functional form remaining oil of polymer flooding and migration rule with fractal theory |
| CN108843310A (en) * | 2018-06-02 | 2018-11-20 | 东北石油大学 | Matrix-high infiltration strip water drive remaining oil producing rule method is determined with fractal theory |
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| CN110005406A (en) * | 2019-04-10 | 2019-07-12 | 中国石油大学(北京) | The system and method for determining oil and water zonation |
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| CN117368239A (en) * | 2023-12-05 | 2024-01-09 | 中国石油大学(华东) | Natural gas hydrate occurrence state dividing method based on CT technology |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105954496A (en) * | 2016-06-13 | 2016-09-21 | 中国石油天然气股份有限公司 | Method for reconstructing pore throat and fluid distribution of sandstone reservoir |
| CN106596352A (en) * | 2016-12-13 | 2017-04-26 | 北京科技大学 | Compound eye-type image acquisition apparatus used for high-temperature microscopic seepage experiment and analysis method thereof |
| CN108104806A (en) * | 2017-12-14 | 2018-06-01 | 中国石油化工股份有限公司 | Remaining Oil Distribution quantitative analysis method |
| CN108678738A (en) * | 2018-06-02 | 2018-10-19 | 东北石油大学 | The method for determining matrix-high infiltration strip functional form remaining oil of polymer flooding distribution and migration rule with fractal theory |
| CN108825222A (en) * | 2018-06-02 | 2018-11-16 | 东北石油大学 | The method for determining the distribution of functional form remaining oil of polymer flooding and migration rule with fractal theory |
| CN108843310A (en) * | 2018-06-02 | 2018-11-20 | 东北石油大学 | Matrix-high infiltration strip water drive remaining oil producing rule method is determined with fractal theory |
| CN108843311A (en) * | 2018-06-02 | 2018-11-20 | 东北石油大学 | The method for determining water drive remaining oil distribution and migration rule with fractal theory |
| CN108952696A (en) * | 2018-06-02 | 2018-12-07 | 东北石油大学 | The method for determining chemical flooding remaining oil distribution and migration rule with fractal theory |
| CN109508718A (en) * | 2019-01-17 | 2019-03-22 | 孙丽艳 | The microcosmic quantitatively characterizing method of remaining oil and system |
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