CN105404735A - Quantitative evaluation method for single well yield contribution rate of fracture and matrix to super-low permeability reservoir - Google Patents
Quantitative evaluation method for single well yield contribution rate of fracture and matrix to super-low permeability reservoir Download PDFInfo
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- CN105404735A CN105404735A CN201510764702.1A CN201510764702A CN105404735A CN 105404735 A CN105404735 A CN 105404735A CN 201510764702 A CN201510764702 A CN 201510764702A CN 105404735 A CN105404735 A CN 105404735A
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Abstract
The invention relates to a quantitative evaluation method for a contribution rate of fractures and a matrix to single well yield of a super-low permeability reservoir. The method comprises the steps of step 1, establishing a reservoir matrix geologic model; step 2, establishing a reservoir fracture geologic model; step 3, combining the reservoir matrix geologic model with the reservoir fracture geologic model through geologic modeling software comprising matrix and fracture modules, and establishing a preliminary reservoir geologic model considering a natural fracture; step 4, performing analog computation of an influence of the matrix on single well yield; step 5, performing analog computation of an influence of the matrix and an artificial fracture on the single well yield; step 6, performing analog computation of an influence of the matrix, the artificial fracture and the natural fracture on the single well yield; and step 7, performing quantitative evaluation on the contribution rate of the fractures and the matrix to the single well yield. According to the method, the contribution degree of the fractures and the matrix to the single well yield of the super-low permeability reservoir is given out and the advantages of seepage capabilities of the matrix and the fractures are pointedly exerted, so that the method plays a vital role in improving development effects.
Description
Technical field
The invention belongs to Oil in Super-low Permeability compact oil reservoir per-well production assessment technique field, be specifically related to crack and matrix to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate.
Background technology
The People's Republic of China's oil and gas industry standard " Oil/Gas Reservoir Assessment method " (SY/T628521997) come into effect according to 1998, extra-low-permeability reservoir refers to that ground level air infiltration rate is less than the oil reservoir of 1.0mD, and such oil reservoir has the feature such as reservoir properties difference, natural microfracture growth.Economical and effective develops the matter of utmost importance that such oil reservoir faces how to improve per-well production, research thinks that the principal element affecting extra-low-permeability reservoir per-well production has: reservoir matrix percolation ability, natural fracture percolation ability and man-made fracture percolation ability when oil reservoir is implemented; Wherein the existence of natural fracture effectively improves Reservoir Seepage ability, but also enhances the nonuniformity of reservoir, adds the difficulty of waterflooding; Artificial fracture is the modification measures in order to improve the raising reservoir draining ability that per-well production is taked, and has the feature that flow conductivity is strong.Carry out extra-low-permeability reservoir crack and matrix to the research of the method for quantitatively evaluating that per-well production is contributed, get the contribution proportion that this three kinds of factors affect per-well production clear, for " dessert " preferred, different injected media energy supplement mode in the reservoir classification and evaluation considering natural fracture development degree with improve the preferred of recovery factor, thus playing the advantage of matrix and crack percolation ability separately targetedly, suggestions for improvement has vital effect.Which kind of select injected media to evaluate, early stage, consideration water filling was evaluated, but research finds when evaluating matrix with water filling and contributing average production per well, when water injection rate is identical with the injection rate IR of actual production block, the bottom-hole injection pressure of simulation often reaches more than 100.0MPa, be far longer than the bottom-hole injection pressure that development block has been dropped in each actual Oil in Super-low Permeability oil field, be also far longer than formation-parting pressure; As considered the stress sensitive of rock, adjustment stress sensitive coefficients, although can bottom-hole injection pressure in matching actual production better, but will the permeability of whole matrix rock core be changed, truly can not reflect the actual production capacity of matrix, therefore, natural fracture, man-made fracture can only be evaluated to the contribution of average production per well by the method for water filling.Crack and matrix is evaluated to the limitation of average production per well contribution rate quantitative evaluation in order to overcome water-filling method, propose the evaluation method of gas injection, from literature survey situation, scholar is not at present also had to carry out correlative study to extra-low-permeability reservoir crack and matrix on the method for quantitatively evaluating that per-well production affects about gas injection.
Summary of the invention
The object of the invention is above-mentionedly to overcome problems of the prior art, provide a kind of crack and matrix to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate.The method gets crack and matrix clear to the percentage contribution of extra-low-permeability reservoir per-well production, for " dessert " preferred, different injected media energy supplement mode in the reservoir classification and evaluation considering natural fracture development degree with improve the preferred of recovery factor, thus play the advantage of matrix and crack percolation ability separately targetedly, suggestions for improvement.
Technical scheme of the present invention is: the invention provides a kind of crack and matrix to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate, it is characterized in that, comprise the steps:
Step 1, sets up reservoir matrix geologic model;
Step 2, sets up Reservoir Fracture geologic model;
Step 3, by step 1 reservoir matrix geologic model and step 2 Reservoir Fracture geologic model by including matrix, the Geologic modeling software of crack module combines, and sets up the preliminary GEOLOGICAL MODELS OF PETROLEUM RESERVOIR considering natural fracture;
Step 4, the analog computation that matrix affects per-well production;
Step 5, matrix and man-made fracture are jointly on the analog computation of per-well production impact;
Step 6, matrix, man-made fracture and natural fracture are jointly on the analog computation of per-well production impact;
Step 7, crack, matrix are to the quantitative evaluation of per-well production contribution rate.
Described step 1 sets up reservoir matrix geologic model, and concrete steps are as follows:
1) prepare individual well log data, well point individual-layer data and sedimentary micro data, rock core correction and playback correction are carried out to described individual well log data simultaneously; Described individual well log data comprises factor of porosity, permeability and oil saturation;
2) utilize step 1) in well point individual-layer data, adopt Kriging regression, obtain initial construction model, be benchmark by actual sand body structural map structure height value simultaneously, initial construction model is adjusted;
3) in step 2) on the basis of initial construction model set up, utilize step 1) in sedimentary micro data, by stochastic simulation and variogram method, set up reservoir phase model;
4) set up in step 3) on the basis of reservoir phase model, application individual well log data carries out variogram matching, sets up reservoir model;
5) initial construction model, reservoir phase model and reservoir model and individual well actual path section and Production development data are carried out contrast adjustment, obtain reservoir matrix geologic model, described Production development data refer to per-well production, water cut.
Described step 2 sets up Reservoir Fracture geologic model, and concrete steps are as follows:
(1) by typical crack recognition and description technology, the characteristic parameter of Oil in Super-low Permeability compact oil reservoir natural fracture is determined;
(2) the preliminary regularity of distribution of natural fracture is obtained by finite element method;
(3) according to step (1) and step (2) described characteristic parameter and the described preliminary regularity of distribution, Reservoir Fracture geologic model is set up; That is: with the described preliminary regularity of distribution for constraint condition, in the crack module of Geologic modeling software, load described Characteristics of The Matural Fractures parameter respectively, set up Reservoir Fracture geologic model.
The analog computation that described step 4 matrix affects per-well production, on the basis of step 1, by numerical reservoir simulation software ECLIPS or select phase behavior simulation software in other numerical reservoir simulation software, by adjusting the binary interaction parameter of injecting gas, the saturation pressure of matching experimental determination and produced GOR, until the saturation pressure of analog computation, produced GOR and laboratory experiment test result relative error < 5%, thus form complete PVT parameter field, and average production per well in 20 years of going into operation under analog computation reservoir matrix geologic model, obtain the relation curve that in these 20 years, matrix affects per-well production, described PVT parameter field comprises pressure, volume and temperature.
Described step 5 matrix and man-made fracture are jointly on the analog computation of per-well production impact; On the basis of step 4, in reservoir matrix geologic model, man-made fracture is loaded to individual well, then carry out the operation 20 annual per-well production analog computation considering matrix and man-made fracture, obtain the relation curve that in these 20 years, matrix and man-made fracture affect per-well production.
Described step 6 matrix, man-made fracture and natural fracture are jointly on the analog computation of per-well production impact; On the basis of step 5, step 2 and step 3, set up the GEOLOGICAL MODELS OF PETROLEUM RESERVOIR considering natural fracture, then carry out the operation 20 annual per-well production analog computation considering matrix, man-made fracture and natural fracture, obtain the relation curve that in these 20 years, matrix, man-made fracture and natural fracture affect per-well production.
Described step 7 crack, matrix are to the quantitative evaluation of per-well production contribution rate; The result of calculation of applying step 4, step 5 and step 6, calculates matrix, man-made fracture and the natural fracture contribution rate to average production per well, wherein:
Matrix per-well production contribution rate=matrix is gone into operation per-well production in these 20 years that per-well production * 100/ in 20 years considers natural fracture, man-made fracture and matrix;
Per-well production in man-made fracture per-well production contribution rate=(consider that man-made fracture and matrix go into operation this year per-well production in 20 of year per-well production-matrix in 20) * 100/ consider natural fracture, man-made fracture and matrix these 20 years;
Per-well production in natural fracture per-well production contribution rate=(in the operation 20 years considering natural fracture, man-made fracture and matrix per-well production in per-well production-consideration man-made fracture and matrix these 20 years) * 100/ consider natural fracture, man-made fracture and matrix these 20 years.
Described typical crack recognition and description technology comprises core observation, outcrop observation and thin slice and observes, and tentatively determines Oil in Super-low Permeability compact oil reservoir Characteristics of The Matural Fractures parameter: development length, density, aperture, cutting-in and azimuth distribution.
Described finite element method is that the density of the natural fracture obtained with core observation is for benchmark, by tectonic stress field develop quantitative test, phased heterogeneous body modeling, mechanical model foundation, Mathematical Models, tectonic stress field calculate, rock burst calculate, obtain preliminary frequency of natural fractures planar distribution.
Beneficial effect of the present invention: the present invention is under substrate model during gas injection, because the density of gas is little, viscosity is low, adjustment injection parameter, injection pressure can not exceed the parting pressure on stratum, can realize carrying out quantitative evaluation to natural fracture and matrix to the degree of productivity contribution.Simultaneously, by evaluation method of the present invention, get crack and matrix clear to the percentage contribution of extra-low-permeability reservoir per-well production, for " dessert " preferred, different injected media energy supplement mode in the reservoir classification and evaluation considering natural fracture development degree with improve the preferred of recovery factor, thus playing the advantage of matrix and crack percolation ability separately targetedly, suggestions for improvement has vital effect.
Below with reference to accompanying drawing, the present invention is described in further details.
Accompanying drawing explanation
Fig. 1 is that a kind of crack of the present invention and matrix are to the process flow diagram of the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate;
Fig. 2 is substrate model permeability flat distribution map of the present invention;
Fig. 3 is natural fracture model permeability flat distribution map of the present invention;
Fig. 4 is the geologic model permeability flat distribution map that the present invention considers natural fracture and matrix;
Fig. 5 is the change curve of per-well production under three kinds of different situations;
Fig. 6 is that crack and matrix are to per-well production shadow contribution rate quantitative evaluation curve;
Fig. 7 is the fracture planes distribution plan of finite element method prediction;
Fig. 8 is 480-130 rhombic inverted nini-spot well pattern, wherein, and ▲-well; ●-oil well; Well array direction parallel with major fracture direction (NE75 °).
Embodiment
Embodiment 1
As shown in Figure 1, crack and matrix, to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate, is characterized in that, comprise the steps:
Step 1, sets up reservoir matrix geologic model;
Step 2, sets up Reservoir Fracture geologic model;
Step 3, by step 1 reservoir matrix geologic model and step 2 Reservoir Fracture geologic model by including matrix, the Geologic modeling software of crack module combines, and sets up the preliminary GEOLOGICAL MODELS OF PETROLEUM RESERVOIR considering natural fracture;
Step 4, the analog computation that matrix affects per-well production;
Step 5, matrix and man-made fracture are jointly on the analog computation of per-well production impact;
Step 6, matrix, man-made fracture and natural fracture are jointly on the analog computation of per-well production impact;
Step 7, crack, matrix are to the quantitative evaluation of per-well production contribution rate.
Embodiment 2
Crack of the present invention and matrix, to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate, comprise the steps:
Step 1, sets up reservoir matrix geologic model;
Concrete steps are as follows:
1) prepare individual well log data, well point individual-layer data and sedimentary micro data, rock core correction and playback correction are carried out to described individual well log data simultaneously; Described individual well log data comprises factor of porosity, permeability and oil saturation;
2) utilize step 1) in well point individual-layer data, adopt Kriging regression, obtain initial construction model, be benchmark by actual sand body structural map structure height value simultaneously, initial construction model is adjusted;
3) in step 2) on the basis of initial construction model set up, utilize step 1) in sedimentary micro data, by stochastic simulation and variogram method, set up reservoir phase model;
4) set up in step 3) on the basis of reservoir phase model, application individual well log data carries out variogram matching, sets up reservoir model;
5) initial construction model, reservoir phase model and reservoir model and individual well actual path section and Production development data are carried out contrast adjustment, obtain reservoir matrix geologic model, described Production development data refer to per-well production, water cut.
Adopt Kriging regression, stochastic simulation and variogram method, variogram matching, well point individual-layer data and sedimentary micro data all to belong to techniques well known, be not just described in detail here; Step 2)-4) Modling model all set up using Geologic modeling software as implementation tool.
Step 2, sets up Reservoir Fracture geologic model;
Concrete steps are as follows:
(1) by typical crack recognition and description technology, the characteristic parameter of Oil in Super-low Permeability compact oil reservoir natural fracture is determined; Described typical crack recognition and description technology comprises core observation, outcrop observation and thin slice and observes, and tentatively determines Oil in Super-low Permeability compact oil reservoir Characteristics of The Matural Fractures parameter: development length, density, aperture, cutting-in and azimuth distribution.
(2) the preliminary regularity of distribution of natural fracture is obtained by finite element method; Described finite element method is that the density of the natural fracture obtained with core observation is for benchmark, by tectonic stress field develop quantitative test, phased heterogeneous body modeling, mechanical model foundation, Mathematical Models, tectonic stress field calculate, rock burst calculate, obtain preliminary frequency of natural fractures planar distribution, belong to techniques well known, be not just described in detail here.
(3) according to step (1) and step (2) described characteristic parameter and the described preliminary regularity of distribution, Reservoir Fracture geologic model is set up; That is: with the described preliminary regularity of distribution for constraint condition, in the crack module of Geologic modeling software, load described Characteristics of The Matural Fractures parameter respectively, set up Reservoir Fracture geologic model.
Step 3, by step 1 reservoir matrix geologic model and step 2 Reservoir Fracture geologic model by including matrix, the Geologic modeling software of crack module combines, and sets up the preliminary GEOLOGICAL MODELS OF PETROLEUM RESERVOIR considering natural fracture;
Step 4, the analog computation that matrix affects per-well production;
On the basis of step 1, by numerical reservoir simulation software ECLIPS or select phase behavior simulation software in other numerical reservoir simulation software, by adjusting the binary interaction parameter of injecting gas, the saturation pressure of matching experimental determination and produced GOR, until the saturation pressure of analog computation, produced GOR and laboratory experiment test result relative error < 5%, thus form complete PVT parameter field, and average production per well in 20 years of going into operation under analog computation reservoir matrix geologic model, obtain the relation curve that in these 20 years, matrix affects per-well production, described PVT parameter field comprises pressure, volume and temperature.
Step 5, matrix and man-made fracture are jointly on the analog computation of per-well production impact;
On the basis of step 4, in reservoir matrix geologic model, man-made fracture is loaded to individual well, then carry out the operation 20 annual per-well production analog computation considering matrix and man-made fracture, obtain the relation curve that in these 20 years, matrix and man-made fracture affect per-well production.
Step 6, matrix, man-made fracture and natural fracture are jointly on the analog computation of per-well production impact; On the basis of step 5, step 2 and step 3, set up the GEOLOGICAL MODELS OF PETROLEUM RESERVOIR considering natural fracture, then carry out the operation 20 annual per-well production analog computation considering matrix, man-made fracture and natural fracture, obtain the relation curve that in these 20 years, matrix, man-made fracture and natural fracture affect per-well production.
Step 7, crack, matrix are to the quantitative evaluation of per-well production contribution rate;
The result of calculation of applying step 4, step 5 and step 6, calculates matrix, man-made fracture and the natural fracture contribution rate to average production per well, wherein:
Matrix per-well production contribution rate=matrix is gone into operation per-well production in these 20 years that per-well production * 100/ in 20 years considers natural fracture, man-made fracture and matrix;
Per-well production in man-made fracture per-well production contribution rate=(consider that man-made fracture and matrix go into operation this year per-well production in 20 of year per-well production-matrix in 20) * 100/ consider natural fracture, man-made fracture and matrix these 20 years;
Per-well production in natural fracture per-well production contribution rate=(in the operation 20 years considering natural fracture, man-made fracture and matrix per-well production in per-well production-consideration man-made fracture and matrix these 20 years) * 100/ consider natural fracture, man-made fracture and matrix these 20 years.
Embodiment 3
As shown in Figure 1, crack and matrix are to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate, and the method comprises:
Step 1, sets up reservoir matrix geologic model;
On the basis of the step 1 of embodiment 2.Oil in Super-low Permeability compact oil reservoir China celebrating oil field Chang-6 oil reservoir unit 284 blocks are positioned in the middle part of Ordos Basin lake basin, belong to deep water gravity sedimentary system; Reservoir average pore 10.6%, mean permeability 0.41mD; According to individual well individual-layer data, be guiding theory with sequence stratigraphy, set up reservoir initial construction model.On initial construction model basis, utilize the geological knowledge data such as individual well well logging interpretation achievement, sedimentary micro border, sand thickness flat distribution map and main trunk profile sand-body distribution figure, reservoir modeling is retrained, sets up reservoir matrix geologic model (as shown in Figure 2).
Step 2, sets up Reservoir Fracture geologic model
(1) by typical crack recognition and description technology, the characteristic parameter of Oil in Super-low Permeability compact oil reservoir natural fracture is determined; Namely carry out core observation, outcrop observation and thin slice to Oil in Super-low Permeability compact oil reservoir reservoir to observe, tentatively determine the development length of Oil in Super-low Permeability compact oil reservoir natural fracture, density, aperture, cutting-in and azimuth distribution feature;
(2) the preliminary regularity of distribution of described natural fracture is obtained by finite element method;
The density of the natural fracture that finite element method obtains with core observation is benchmark, obtains preliminary frequency of natural fractures planar distribution by develop quantitative examination, phased heterogeneous body modeling, mechanical model foundation, Mathematical Models, tectonic stress field calculating, rock burst calculating etc. of tectonic stress field.Fig. 7 is the fracture planes distribution plan of finite element method prediction.
(3) according to described characteristic parameter and the described preliminary regularity of distribution, Reservoir Fracture geologic model is set up;
This step, by utilizing crack modeling technique, combines to the cognitive achievements of natural fracture and finite element method, obtains Reservoir Fracture geologic model (see figure 3).
For Changqing oilfields in the embodiment of the present invention, cognitive achievements according to the natural fracture to Changqing oilfields Oil in Super-low Permeability compact oil reservoir: extra-low-permeability reservoir grow have east northeast to, NW trending, approximately EW and nearly four groups, north-south natural fracture, wherein, east orientation crack is maximum, next is NW trending crack, and approximately EW and the relative agensis in crack, nearly north-south.Because Changqing oilfields natural fracture mostly is micro crack, and micro crack mainly plays seepage channel, preserves effect relatively poor.
In an embodiment, the cognitive achievements of other natural fractures can be selected as add-in according to actual reservoir geology situation, the Geologic modeling software that the present invention sets up the employing of Reservoir Fracture geologic model is RMS or Frac.
Step 3, according to the developmental state of described natural fracture in different substrates, combines described Reservoir Fracture geologic model and described reservoir matrix geologic model, sets up the preliminary GEOLOGICAL MODELS OF PETROLEUM RESERVOIR considering natural fracture;
In the embodiment of the present invention, mainly grow in sandstone according to extra-low-permeability reservoir natural fracture, obsolete feature in mud stone, natural fracture is loaded in sandstone, in mud stone, do not load natural fracture, thus described Reservoir Fracture geologic model and described reservoir matrix geologic model are combined (as shown in Figure 4).
Step 4, the analog computation that matrix affects per-well production
Oil in Super-low Permeability compact oil reservoir China celebrating oil field Chang-6 oil reservoir unit 284 block injection-production patterns are the rhombic inverted nini-spot well pattern of well spacing 480, array pitch 130, and the pressure-break half of corner well is long is designed to 120 meters, and end hole pressure-break half is long is designed to 90 meters.Injected media is the CO of purity 98%
2, injection rate is 40m under formation condition
3/ d.Be illustrated in figure 8 480-130 rhombic inverted nini-spot well pattern;
On the basis of step 1, apply numerical reservoir simulation software ECLIPS or select the phase behavior simulation software in other numerical reservoir simulation software, by adjusting the binary interaction parameter of injecting gas, the saturation pressure of matching experimental determination and produced GOR, until the saturation pressure of analog computation, produced GOR and laboratory experiment test result relative error < 5%, thus form complete PVT parameter field, the 20 annual per-well productions and analog computation matrix is gone into operation, obtain the relation curve (as shown in Figure 5) that matrix in these 20 years affects per-well production.
Saturation pressure and single flash distillation Data Comparison table
Unit 284 block resident fluid matching composition
Binary interaction parameter
Step 5, matrix and man-made fracture are jointly on the analog computation of per-well production impact
On the basis of step 4, in reservoir matrix geologic model, man-made fracture is loaded to producing well, then carry out the operation 20 annual per-well production analog computation considering matrix and man-made fracture, obtain the relation curve (as shown in Figure 5) that matrix and man-made fracture in these 20 years affect per-well production.
Step 6, matrix, man-made fracture and natural fracture are jointly on the analog computation of per-well production impact
On the basis of step 5, step 2 and step 3, set up the GEOLOGICAL MODELS OF PETROLEUM RESERVOIR considering natural fracture, then carry out the operation 20 annual per-well production analog computation considering matrix, man-made fracture and natural fracture, obtain the relation curve (as shown in Figure 5) that matrix, man-made fracture and natural fracture in these 20 years affect per-well production.
Step 7, crack, matrix are to the quantitative evaluation of per-well production percentage contribution
The result of calculation of applying step 4, step 5 and step 6, can calculate matrix, man-made fracture and the natural fracture contribution rate (see figure 6) to average production per well, wherein:
Matrix per-well production contribution rate=matrix is gone into operation per-well production in these 20 years that per-well production * 100/ in 20 years considers natural fracture, man-made fracture and matrix;
Per-well production in man-made fracture per-well production contribution rate=(consider that man-made fracture and matrix go into operation this year per-well production in 20 of year per-well production-matrix in 20) * 100/ consider natural fracture, man-made fracture and matrix these 20 years;
Per-well production in natural fracture per-well production contribution rate=(in the operation 20 years considering natural fracture, man-made fracture and matrix per-well production in per-well production-consideration man-made fracture and matrix these 20 years) * 100/ consider natural fracture, man-made fracture and matrix these 20 years.
As can be seen from Figure 6: 1. matrix is in rising trend in time to the contribution rate of per-well production, be about 25.87% in the contribution rate of initial stage of development to average production per well, finally to the contribution rate of average production per well for about 50.0% will be reached; 2. man-made fracture is on a declining curve in time to the contribution rate of single well productivity, is about 25.92% in the contribution rate of initial stage of development to average production per well, finally will drop to about 11.5% to the contribution rate of average production per well; 3. natural fracture is to first on a declining curve in time to the contribution rate of per-well production, then tends towards stability, is about 48.53% in the contribution rate of initial stage of development to average production per well, finally to the contribution rate of average production per well for will about 37.42% be dropped to.Achievement in research is the advantage playing matrix and crack percolation ability separately targetedly, improves recovery ratio further and provides important evidence.
The part do not described in detail in present embodiment belongs to the known conventional means of the industry, does not describe one by one here.More than exemplifying is only illustrate of the present invention, does not form the restriction to protection scope of the present invention, everyly all belongs within protection scope of the present invention with the same or analogous design of the present invention.
Claims (9)
1. crack and matrix are to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate, it is characterized in that, comprise the steps:
Step 1, sets up reservoir matrix geologic model;
Step 2, sets up Reservoir Fracture geologic model;
Step 3, by step 1 reservoir matrix geologic model and step 2 Reservoir Fracture geologic model by including matrix, the Geologic modeling software of crack module combines, and sets up the preliminary GEOLOGICAL MODELS OF PETROLEUM RESERVOIR considering natural fracture;
Step 4, the analog computation that matrix affects per-well production;
Step 5, matrix and man-made fracture are jointly on the analog computation of per-well production impact;
Step 6, matrix, man-made fracture and natural fracture are jointly on the analog computation of per-well production impact;
Step 7, crack, matrix are to the quantitative evaluation of per-well production contribution rate.
2. crack according to claim 1 and matrix are to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate, it is characterized in that, described step 1 sets up reservoir matrix geologic model, and concrete steps are as follows:
1) prepare individual well log data, well point individual-layer data and sedimentary micro data, rock core correction and playback correction are carried out to described individual well log data simultaneously; Described individual well log data comprises factor of porosity, permeability and oil saturation;
2) utilize step 1) in well point individual-layer data, adopt Kriging regression, obtain initial construction model, be benchmark by actual sand body structural map structure height value simultaneously, initial construction model is adjusted;
3) in step 2) on the basis of initial construction model set up, utilize step 1) in sedimentary micro data, by stochastic simulation and variogram method, set up reservoir phase model;
4) set up in step 3) on the basis of reservoir phase model, application individual well log data carries out variogram matching, sets up reservoir model;
5) initial construction model, reservoir phase model and reservoir model and individual well actual path section and Production development data are carried out contrast adjustment, obtain reservoir matrix geologic model, described Production development data refer to per-well production, water cut.
3. crack according to claim 1 and matrix are to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate, it is characterized in that, described step 2 sets up Reservoir Fracture geologic model, and concrete steps are as follows:
(1) by typical crack recognition and description technology, the characteristic parameter of Oil in Super-low Permeability compact oil reservoir natural fracture is determined;
(2) the preliminary regularity of distribution of natural fracture is obtained by finite element method;
(3) according to step (1) and step (2) described characteristic parameter and the described preliminary regularity of distribution, Reservoir Fracture geologic model is set up; That is: with the described preliminary regularity of distribution for constraint condition, in the crack module of Geologic modeling software, load described Characteristics of The Matural Fractures parameter respectively, set up Reservoir Fracture geologic model.
4. crack according to claim 1 and matrix are to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate, it is characterized in that, the analog computation that described step 4 matrix affects per-well production, on the basis of step 1, by numerical reservoir simulation software ECLIPS or select phase behavior simulation software in other numerical reservoir simulation software, by adjusting the binary interaction parameter of injecting gas, the saturation pressure of matching experimental determination and produced GOR, until the saturation pressure of analog computation, produced GOR and laboratory experiment test result relative error < 5%, thus form complete PVT parameter field, and average production per well in 20 years of going into operation under analog computation reservoir matrix geologic model, obtain the relation curve that in these 20 years, matrix affects per-well production, described PVT parameter field comprises pressure, volume and temperature.
5. the crack according to claim 1 or 4 and matrix, to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate, is characterized in that, described step 5 matrix and man-made fracture are jointly on the analog computation of per-well production impact; On the basis of step 4, in reservoir matrix geologic model, man-made fracture is loaded to individual well, then carry out the operation 20 annual per-well production analog computation considering matrix and man-made fracture, obtain the relation curve that in these 20 years, matrix and man-made fracture affect per-well production.
6. the crack according to claim 1 or 4 and matrix, to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate, is characterized in that, described step 6 matrix, man-made fracture and natural fracture are jointly on the analog computation of per-well production impact; On the basis of step 5, step 2 and step 3, set up the GEOLOGICAL MODELS OF PETROLEUM RESERVOIR considering natural fracture, then carry out the operation 20 annual per-well production analog computation considering matrix, man-made fracture and natural fracture, obtain the relation curve that in these 20 years, matrix, man-made fracture and natural fracture affect per-well production.
7. crack according to claim 1 and matrix are to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate, it is characterized in that, described step 7 crack, matrix are to the quantitative evaluation of per-well production contribution rate; The result of calculation of applying step 4, step 5 and step 6, calculates matrix, man-made fracture and the natural fracture contribution rate to average production per well, wherein:
Matrix per-well production contribution rate=matrix is gone into operation per-well production in these 20 years that per-well production * 100/ in 20 years considers natural fracture, man-made fracture and matrix;
Per-well production in man-made fracture per-well production contribution rate=(consider that man-made fracture and matrix go into operation this year per-well production in 20 of year per-well production-matrix in 20) * 100/ consider natural fracture, man-made fracture and matrix these 20 years;
Per-well production in natural fracture per-well production contribution rate=(in the operation 20 years considering natural fracture, man-made fracture and matrix per-well production in per-well production-consideration man-made fracture and matrix these 20 years) * 100/ consider natural fracture, man-made fracture and matrix these 20 years.
8. crack according to claim 3 and matrix are to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate, it is characterized in that, described typical crack recognition and description technology comprises core observation, outcrop observation and thin slice and observes, and tentatively determines Oil in Super-low Permeability compact oil reservoir Characteristics of The Matural Fractures parameter: development length, density, aperture, cutting-in and azimuth distribution.
9. crack according to claim 3 and matrix are to the method for quantitatively evaluating of extra-low-permeability reservoir per-well production contribution rate, it is characterized in that, described finite element method is that the density of the natural fracture obtained with core observation is for benchmark, by tectonic stress field develop quantitative test, phased heterogeneous body modeling, mechanical model foundation, Mathematical Models, tectonic stress field calculate, rock burst calculate, obtain preliminary frequency of natural fractures planar distribution.
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