CN104698496A - Small sand body boundary identification method and small sand body space quantitative description method - Google Patents
Small sand body boundary identification method and small sand body space quantitative description method Download PDFInfo
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Abstract
The invention discloses a small sand body boundary identification method and a small sand body space quantitative description method. The small sand body boundary identification method comprises the following steps: summarizing the development rules and scale of a sand body according to the geological situation of a region; summarizing the seismic response characteristics of a reservoir and carrying out seismic profile identification and interpretation through seismic forward modeling; processing earthquake in a frequency division way, extracting seismic attributes of different frequency bands, and adopting known well data analysis to preferably select seismic attributes better corresponding to the reservoir and the sand body; and finely describing the sand body by comprehensively adopting the geological rules, sand body seismic response characteristics and frequency-division seismic attribute analysis. The small sand body space quantitative description method comprises the steps of drawing the boundary of a sand body and determining a favorable area of a reservoir by the above method, and quantitatively describing the spatial shape of the sand body through well logging constrained inversion. The boundary of a described small sand body is accurate and quick to describe, and the accuracy of reservoir predication can be improved.
Description
Technical field
The present invention relates to oil field stratum Division and contrast technical field, knowledge method and a kind of little sand body space quantitative description are sentenced in concrete a kind of little sand body border.
Background technology
Along with the increasing of land difficulties in exploration, find the minimizing of scale reserves, beach shallow sea has become the main battlefield that oil field increasing the storage is expanded production.For this block shallow oil reservoir of Shengli Oil Field, belong to meandering stream deposit, reservoir lateral continuity is poor, and reservoir development principal character has: in (1) longitudinal direction, reservoir thickness is thin, oil reservoir is single, development degree is poor, and reservoir prediction difficulty is large; (2) in plane, reservoir change is fast, poor continuity, and exists stacked, and it is large that difficulty is portrayed on border.For this kind of little and loose sand body meticulous depiction border, how to determine reservoir boundaries form, implement sand body planar distribution and be described in the urgent need to a kind of new method.Adopt the method for conventional seismic attribute and reservoir inversion generally can obtain good effect to the reservoir that main river channel sand is thicker at triumph shallow-layer sand body contour description, but be not clearly to thin and loose sand body effect.
Summary of the invention
The object of the invention is to, provide a kind of little sand body border to sentence knowledge method, solve fluvial depositional reservoir horizontal change fast, the problem that the thin and reservoir boundaries that sporadicly distributes in the plane of thickness is difficult to portray.Another object of the present invention is to provide a kind of little sand body space quantitative description.It is instruct that the present invention adopts with geological depositional rules, in conjunction with conventional seismic attribute and frequency division property analysis method, solves the meticulous depiction problem of the complicated reservoirs border motif to thin and loose sand body.
The technical scheme that the employing of knowledge method is sentenced on the present invention's little sand body border is: knowledge method is sentenced on a kind of little sand body border, comprises the steps:
Step 1: according to areal geology situation, sums up sand body law of development and scale;
Step 2: by seismic forward simulation, sums up seismic reservoir response characteristic, carries out seismic section identification explanation;
Step 3: carry out scaling down processing to earthquake, extracts different frequency section seismic properties, and the analysis of application fixed well, preferably with reservoir, the good seismic properties of the corresponding effect of sand body;
Step 4: integrated application geologic rule, sand body seismic response features, frequency division seismic attributes analysis, carries out meticulous depiction to sand body.
Further, in step 4, also comprise the technology such as application seismic event is followed the trail of, the analysis of multiple wavelet decomposition waveform component, determine reservoir Favorable Zones, the step on meticulous depiction sand body border.
Further, described frequency division seismic attributes analysis comprises the corresponding relation between deposition characteristics and multiple seismic properties utilizing fixed well to survey out, and optimization can the property parameters of meticulous depiction river course form, for carrying out meticulous depiction to sand body.
Further, described meticulous depiction river course form comprises: the corresponding relation utilizing average overall energy within the scope of certain hertz and river course form, meticulous depiction river course form.
Further, in step 1, by areal geology situation analysis, determine sedimentary facies belt, by the sand body deposition rule of different sedimentary facies belt, sum up sand body law of development and scale.
Further, in step 4, described frequency division seismic attributes analysis comprises and utilizes low-frequency information mainly to reflect main stem developmental morphology, mainly reflect the feature of answering both sides, river course thin interbed sand body with high-frequency information, portrays river course form and sand-body distribution.
Further, described sedimentary facies belt comprises riverbed parfacies point bar, embankment parfacies raised bank, the little sand body of valley flat.
Further, in step 2, described summary seismic reservoir response characteristic refers to by seismic reservoir forward simulation, sums up river course seismic response features, sand body seismic response features, carries out seismic section identification explanation.
Further, in seismic forward simulation, river channel sand adopts minor axis strong reflection amplitude.
The technical scheme that little sand body space quantitative description adopts is: little sand body space quantitative description comprises the following steps:
Step 1: adopt above-mentioned little sand body border to sentence knowledge method and portray sand body border, determine reservoir Favorable Zones;
Step 2, by Application of Logging-constrained Inversion, carries out sand body spatial shape quantitative description.
Invent for the little and loose feature of sea shoal reservoir, determine and analyze the analysis of seismic data scaling down processing carry out portraying of sand body border from the research of reservoir sedimentation model, Seismic reflection character.The seismic analysis of surge well lie, determines seismic reservoir reflectance signature, and integrated application seismic event is followed the trail of, frequency division Seismic attribute analysis technology, portrays sand body border, the little sand body boundary accurate portrayed, fast.On this basis, by Application of Logging-constrained Inversion, carry out sand body spatial shape quantitative description, reservoir prediction accuracy can be improved.
The present invention, by portraying the little sand body border of Margin reservoir, implements the planar characteristics of distribution of narrow river channel sand, improves the drilling success of exploitation well.By the application to this technology, achieve that Shengli Oil Field is old 168, old 178, old 163-x51, the layer description of cultivating east 123, cultivating sea, 6 beaches such as east 403, blue or green east 5 Margin reservoir, all achieve good effect, wherein, old 168 pieces are total to the new Jing67Kou of finishing drilling, and prediction sand body plane Drilling ratio reaches 98%.
Accompanying drawing explanation
Fig. 1 a is shaped like narrow sand body development models figure;
Fig. 1 b is wide belt sand body development models figure;
Fig. 1 c is the development models figure of potato shape sand body at raised bank;
Fig. 1 d is the development models figure of potato shape sand body at valley flat;
The old 168 pieces of sand body seismic response features of Fig. 2;
Fig. 3 earthquake frequency division attribute 15-35hz earthquake gross energy distribution plan;
Fig. 4 earthquake frequency division attribute 35-45hz earthquake gross energy distribution plan.
Embodiment
The present invention is further illustrated below by instantiation (SHENGLI PETROLEUM AREA).
Embodiment 1.Knowledge method is sentenced on a kind of little sand body border, comprises the steps:
Step 1: from regional study, relies on adjacent old liberated area sedimentary characteristic, holds sand body deposition rule.Sum up sand body law of development and scale.Fig. 1 a to Fig. 1 d illustrates different sedimentary micro sand body development models figure.As shown in Figure 1a, the thick sand of shaped like narrow sand body is grown on beach, low curved river bank; Thick sand is on beach, low curved river bank, and thickness is 6-12 rice, width at 100-500 rice, single sand extend long not etc.As shown in Figure 1 b, wide belt sand body is grown on beach, higher curved river bank; Extend in many at 1-3 km, width is generally at 500-800 rice, and be intermediate gauge sand, thickness is at 4-8 rice.As illustrated in figure 1 c, thinner potato sand body grown by raised bank; Diameter, generally at 100-400 rice, mostly is thinner sand, and thickness is at 2-5 rice.As shown in Figure 1 d, valley flat grows thinner potato sand body, and diameter is generally at 100-400 rice, and thickness is less than 3 meters.
Step 2: by seismic forward simulation, sum up seismic reservoir response characteristic, carry out seismic section identification explanation, river channel sand shows as minor axis strong reflection feature, and thick sand bodies shows as the strong amplitude of low frequency, and alternating layers sand body shows as earthquake complex wave feature (Fig. 2).
Step 3: carry out scaling down processing to earthquake, extracts different frequency section (5-15hz, 15-25hz, 25-35hz, 35-45hz, 45-55hz) seismic properties, and the analysis of application fixed well, preferably with reservoir, the good seismic properties of the corresponding effect of sand body.
Step 4: integrated application geologic rule, sand body seismic response features, frequency division seismic attributes analysis, carries out meticulous depiction to sand body.
In step 4, also comprise the technology such as application seismic event is followed the trail of, the analysis of multiple wavelet decomposition waveform component, determine reservoir Favorable Zones, the step on meticulous depiction sand body border.Described frequency division seismic attributes analysis comprises the corresponding relation between deposition characteristics and multiple seismic properties utilizing fixed well to survey out, and optimization can the property parameters of meticulous depiction river course form, for carrying out meticulous depiction to sand body.
Described meticulous depiction river course form comprises: the corresponding relation utilizing average overall energy in certain earthquake frequency band range and river course form, meticulous depiction river course form.As shown in Figure 3, in old 168 areas, 15-35Hz average overall energy has good reflection to river course form, red green Regional Representative river channel sand.
In step 4, described frequency division seismic attributes analysis comprises and utilizes low-frequency information mainly to reflect main stem developmental morphology, mainly reflect the feature of answering both sides, river course thin interbed sand body with high-frequency information, portrays river course form and sand-body distribution.As shown in Figure 4, in old 168 areas, the reservoir that 35-45Hz average overall energy distributes and river channel sand thickness of two sides is thin has good correspondence, red green Regional Representative river course and both sides Thin Sandbody.
In step 1, by areal geology situation analysis, determine sedimentary facies belt, by the sand body deposition rule of different sedimentary facies belt, sum up sand body law of development and scale.Described sedimentary facies belt comprises riverbed parfacies point bar, embankment parfacies raised bank, the little sand body of valley flat.These sedimentary facies belts, river course is narrow, and sand body is ribbon, potato shape or irregular, and single sand body scale is less.
In step 2, described summary seismic reservoir response characteristic refers to by seismic reservoir forward simulation, sums up the little sand body seismic response features in river course, carries out seismic section identification explanation.In seismic forward simulation, sum up river channel sand and show as minor axis strong reflection feature, thick sand bodies shows as the strong amplitude of low frequency, and alternating layers sand body shows as earthquake complex wave feature, adopts Forward modelling result to follow the trail of track to river channel sand on seismic section and explains.
Embodiment 2.A kind of little sand body space quantitative description, is characterized in that: comprise the following steps:
Step 1: adopt little sand body border described in embodiment 1 to sentence knowledge method and portray sand body border, determine reservoir Favorable Zones;
Step 2, by Application of Logging-constrained Inversion, carries out sand body spatial shape quantitative description.
Under the present embodiment adopts the research of reservoir deposition rule to instruct, integrated application seismic event is followed the trail of, multiple wavelet decomposes the technology such as waveform component analysis, frequency division seismic attributes analysis, determines reservoir Favorable Zones, portrays sand body border.On this basis, by the method for Application of Logging-constrained Inversion, fine description is carried out to the thickness of sand body, carry out sand body spatial shape quantitative description, improve reservoir prediction accuracy.
The present invention, by portraying the little sand body border of Margin reservoir, implements the planar characteristics of distribution of narrow river channel sand, improves the drilling success of exploitation well.By the application to this technology, the layer description of achieve old 168, old 178, old 163-x51, cultivating east 123, cultivating sea, 6 beaches such as east 403, blue or green east 5 Margin reservoir, all achieves good effect, wherein, old 168 pieces are total to the new Jing67Kou of finishing drilling, and prediction sand body plane Drilling ratio reaches 98%.
Claims (10)
1. a knowledge method is sentenced on little sand body border, and its feature exists: comprise the steps:
Step 1: according to areal geology situation, sums up sand body law of development and scale;
Step 2: by seismic forward simulation, sums up seismic reservoir response characteristic, carries out seismic section identification explanation;
Step 3: carry out scaling down processing to earthquake, extracts different frequency section seismic properties, the analysis of application fixed well, the preferably good seismic properties of effect corresponding to reservoir;
Step 4: integrated application geologic rule, sand body seismic response features, frequency division seismic attributes analysis, carries out meticulous depiction to sand body.
2. knowledge method is sentenced on a kind of little sand body border as claimed in claim 1, and its feature exists: in step 4, also comprises the technology such as application seismic event is followed the trail of, the analysis of multiple wavelet decomposition waveform component, determines reservoir Favorable Zones, the step on meticulous depiction sand body border.
3. knowledge method is sentenced on a kind of little sand body border as claimed in claim 2, its feature exists: described frequency division seismic attributes analysis comprises the corresponding relation between deposition characteristics and multiple seismic properties utilizing fixed well to survey out, optimization can the property parameters of meticulous depiction river course form, for carrying out meticulous depiction to sand body.
4. knowledge method is sentenced on a kind of little sand body border as claimed in claim 3, and its feature exists: described meticulous depiction river course form comprises: the corresponding relation utilizing average overall energy in certain earthquake frequency band range and river course form, meticulous depiction river course form.
5. knowledge method is sentenced on the little sand body border of one as described in a claim as any in claim 1 to 4, its feature exists: in step 1, by areal geology situation analysis, determines sedimentary facies belt, by the sand body deposition rule of different sedimentary facies belt, sum up sand body law of development and scale.
6. knowledge method is sentenced on the little sand body border of one as described in a claim as any in claim 1 to 4, its feature exists: in step 4, described frequency division seismic attributes analysis comprises and utilizes low-frequency information mainly to reflect main stem developmental morphology, mainly reflect the feature of answering both sides, river course thin interbed sand body with high-frequency information, portrays river course form and sand-body distribution.
7. knowledge method is sentenced on the little sand body border of one as described in a claim as any in claim 1 to 4, and its feature exists: described sedimentary facies belt comprises riverbed parfacies point bar, embankment parfacies raised bank, the little sand body of valley flat.
8. knowledge method is sentenced on the little sand body border of one as described in a claim as any in claim 1 to 4, its feature exists: in step 2, described summary seismic reservoir response characteristic refers to by seismic reservoir forward simulation, sum up river course seismic response features, sand body seismic response features, carry out seismic section identification explanation.
9. knowledge method is sentenced on the little sand body border of one as described in a claim as any in claim 1 to 4, and its feature exists: in seismic forward simulation, and river channel sand adopts minor axis strong reflection amplitude.
10. little sand body space quantitative description, is characterized in that: comprise the following steps:
Step 1: adopt little sand body border described in claim 1 to any claim of claim 9 to sentence knowledge method and portray sand body border, determine reservoir Favorable Zones;
Step 2, by Application of Logging-constrained Inversion, carries out sand body spatial shape quantitative description.
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| CN105445800A (en) * | 2015-11-13 | 2016-03-30 | 中国石油化工股份有限公司 | Thick sand body top differentiation lithologic reservoir identification method |
| CN106226841A (en) * | 2016-07-11 | 2016-12-14 | 中国石油大学(华东) | A kind of fluvial facies three-dimensional sedimentary facies model Decided modelling method |
| CN106777440A (en) * | 2015-11-24 | 2017-05-31 | 中国石油化工股份有限公司 | Delta front distributary channel length prediction method |
| CN107831537A (en) * | 2017-01-05 | 2018-03-23 | 中国石油化工股份有限公司 | High sandy ground is than turbidite layer description method |
| CN107918150A (en) * | 2016-10-10 | 2018-04-17 | 中国石油化工股份有限公司 | Based on single river recognition methods under offshore oilfield wide spacing |
| CN109655900A (en) * | 2017-10-11 | 2019-04-19 | 中国石油化工股份有限公司 | The recognition methods of karst ancient stream channel and system |
| CN109655894A (en) * | 2017-10-12 | 2019-04-19 | 中国石油化工股份有限公司 | Carbonate rock ancient stream channel seismic inversion low frequency model construction method and system |
| CN109655896A (en) * | 2017-10-10 | 2019-04-19 | 中国石油化工股份有限公司 | The method and system that ancient stream channel identifies and portrays |
| CN110568482A (en) * | 2019-05-10 | 2019-12-13 | 中国石油大学(华东) | fracture zone seismic interpretation method based on geological pattern constraint |
| CN112034513A (en) * | 2020-09-03 | 2020-12-04 | 中海石油(中国)有限公司 | Quantitative evaluation method for peripheral potential resource quantity of developed oil field |
| CN112711069A (en) * | 2019-10-24 | 2021-04-27 | 中国石油化工股份有限公司 | Point sand dam prediction method based on meandering river channel evolution of plain area |
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| CN105372703A (en) * | 2015-08-11 | 2016-03-02 | 中国石油化工股份有限公司 | River channel sand body fine-identification method |
| CN105116449A (en) * | 2015-08-11 | 2015-12-02 | 中国石油化工股份有限公司 | Method for identifying weak reflection reservoir |
| CN105353411A (en) * | 2015-10-27 | 2016-02-24 | 中国石油大学(华东) | Description method of reservoir sand bodies on ultra-deep coal layer |
| CN105445800A (en) * | 2015-11-13 | 2016-03-30 | 中国石油化工股份有限公司 | Thick sand body top differentiation lithologic reservoir identification method |
| CN106777440A (en) * | 2015-11-24 | 2017-05-31 | 中国石油化工股份有限公司 | Delta front distributary channel length prediction method |
| CN106226841B (en) * | 2016-07-11 | 2019-03-08 | 中国石油大学(华东) | A kind of fluvial facies three-dimensional sedimentary facies model Decided modelling method |
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| CN109655896B (en) * | 2017-10-10 | 2021-06-29 | 中国石油化工股份有限公司 | Method and system for identifying and depicting karst ancient river channel |
| CN109655896A (en) * | 2017-10-10 | 2019-04-19 | 中国石油化工股份有限公司 | The method and system that ancient stream channel identifies and portrays |
| CN109655900A (en) * | 2017-10-11 | 2019-04-19 | 中国石油化工股份有限公司 | The recognition methods of karst ancient stream channel and system |
| CN109655894A (en) * | 2017-10-12 | 2019-04-19 | 中国石油化工股份有限公司 | Carbonate rock ancient stream channel seismic inversion low frequency model construction method and system |
| CN110568482A (en) * | 2019-05-10 | 2019-12-13 | 中国石油大学(华东) | fracture zone seismic interpretation method based on geological pattern constraint |
| CN110568482B (en) * | 2019-05-10 | 2020-08-11 | 中国石油大学(华东) | Fracture zone seismic interpretation method based on geological pattern constraint |
| CN112711069A (en) * | 2019-10-24 | 2021-04-27 | 中国石油化工股份有限公司 | Point sand dam prediction method based on meandering river channel evolution of plain area |
| CN112711069B (en) * | 2019-10-24 | 2024-03-26 | 中国石油化工股份有限公司 | Sand point dam prediction method based on plain area curved stream river channel evolution |
| CN112034513A (en) * | 2020-09-03 | 2020-12-04 | 中海石油(中国)有限公司 | Quantitative evaluation method for peripheral potential resource quantity of developed oil field |
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