CN107102377B - The method of quantitative forecast tight sand favorable oil/gas exploration area - Google Patents
The method of quantitative forecast tight sand favorable oil/gas exploration area Download PDFInfo
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Abstract
The present invention provides a kind of methods of quantitative forecast tight sand favorable oil/gas exploration area, are related to oil and gas exploration and development field, and tight sand oil gas Efficient Exploration can be pushed to develop, specifically comprised the following steps：(1) porosity, permeability and the oil saturation of different oil bearing grade reservoirs are tested；(2) according to the oil saturation of different oil bearing grade reservoirs, the oil saturation lower limiting value of oil reservoir and oil-water common-layer is determined；According to the porosity and permeability of different oil bearing grade reservoirs, the fluxion strap index FZI of different oil bearing grade reservoirs is calculated；(3) the corresponding fluxion strap index FZI lower limiting values in tight sand favorable oil/gas exploration area are determined；(4) it is directed to research layer position, draws average fluxion strap index FZI flat distribution maps, in conjunction with the corresponding fluxion strap index lower limiting value in tight sand favorable oil/gas exploration area, the prediction tight sand favorable oil/gas exploration area regularity of distribution.
Description
Technical field
The present invention relates to oil and gas exploration and development fields more particularly to a kind of quantitative forecast tight sand oil gas to have
The method of sharp exploration area.
Background technology
Main Types one of of the tight sand oil gas as unconventional petroleum resources, in recent years exploration and development achieve breakthrough
Property progress, become and produce " major fields " and " bright spot type " in oil gas increasing the storage, in basins such as Erdos, Zhunger Basin, loose the Liao Dynasty
It is found that 5-10 × 108T indicated reserves c2 scales area also obtains important discovery in Bohai Sea Gulf, the Sichuan Basin.Tight sandstone reservoir is often big
Area distributions, and continuity or quasi-continuity oil-gas accumulation is presented.But tight sand often experienced complicated diagenesis and change
Process is made, causes poor reservoir properties, pore throat character and its seepage characteristic complexity, anisotropism strong, to make oil-gas distribution
Complexity, the universal visible oil/gas show of different well locations, but resource abundance is low, oiliness spatial distribution differences are big, increases fine and close sand
The difficulty and risk of rock oil-gas exploration and development.Therefore, carry out tight sand oil and gas reservoir favorable exploratory area prediction is to realize it is it
The key of Efficient Exploration exploitation.
The core of tight sand oil and gas reservoir favorable exploratory area prediction research is the preferred of evaluation parameter.Sealing core drilling oil-containing
Saturation degree is reflection reservoir oiliness feature effective parameter the most intuitive, is had to prediction favorable exploration areas distribution of crucial importance
Meaning.But sealing core drilling process is complicated, of high cost, and oil saturation test process is cumbersome, is not easy to open on a large scale
Exhibition experiment, to prevent it from being widely used in favorable exploratory area prediction research.It is ground currently, porosity and permeability is sandstone reservoir
Most easily by testing the parameter obtained in studying carefully, there is apparent control action, Ke Yizhi to conventional sandstone reservoir oil saturation
It connects and is used for evaluating reservoir and favorable exploratory area prediction.Different from conventional sandstone, tight sand oil and gas reservoir pore throat character is extremely multiple
Miscellaneous, the correlation between porosity and permeability and oil saturation is poor, is no longer the Dominated Factors of oil saturation.Cause
This, is introduced directly into the storage of tight sand oil gas by the conventional sandstone Oil/Gas Reservoir Assessment method based on porosity and permeability at this stage
In layer favorable exploration areas evaluation and foreca research, the risk of erroneous judgement may be brought to tight sand oil-gas exploration and development.With oil
The continuous improvement of gas exploration Exploitation degree, it is higher and higher to the required precision of favorable exploratory area prediction, merely with porosity and ooze
Saturating rate carries out favorable exploratory area prediction as evaluation parameter and has been unable to meet demand, needs preferably more rational parameter anti-
Reflect the comprehensive characteristics such as physical property, pore throat character and the oiliness of tight sand oil and gas reservoir, formed a kind of simple and practical method into
It predicts row tight sand favorable oil/gas exploration area.
Invention content
The purpose of the present invention is to provide a kind of methods of quantitative forecast tight sand favorable oil/gas exploration area, favorably to survey
The corresponding oil saturation lower limit in exploratory area is foundation, in conjunction with the related pass between oil saturation and corresponding fluxion strap index
System, determines the corresponding fluxion strap index lower limit in tight sand favorable oil/gas exploration area, is surveyed to form tight sand favorable oil/gas
Exploratory area quantitative forecasting technique pushes the exploitation of tight sand oil gas Efficient Exploration.
The present invention provides a kind of methods of quantitative forecast tight sand favorable oil/gas exploration area, specifically include following step
Suddenly：
(1) porosity, permeability and the oil saturation of different oil bearing grade reservoirs are tested；
(2) according to the oil saturation of different oil bearing grade reservoirs, under the oil saturation for determining oil reservoir and oil-water common-layer
Limit value；
According to the porosity and permeability of different oil bearing grade reservoirs, the fluxion strap index of different oil bearing grade reservoirs is calculated
FZI,
Fluxion strap index FZI is expressed as with porosity Φ and permeability K：FZI=RQI/Φr, wherein：RQIFor reservoir quality
Index, RQI=0.0314 (K/ Φ)0.5；ΦrFor hole and skeleton particle volume ratio, Φr=Φ/(1- Φ)；
(3) correlativity between the fluxion strap index FZI and oil saturation of identical oil bearing grade reservoir, and root are established
According to the oil reservoir of above-mentioned determination and the oil saturation lower limiting value of oil-water common-layer, determine that tight sand favorable oil/gas exploration area is corresponding
Fluxion strap index FZI lower limiting values.
(4) it is directed to research layer position, average fluxion strap index FZI flat distribution maps are drawn, in conjunction with tight sand favorable oil/gas
The corresponding fluxion strap index lower limiting value in exploration area, the prediction tight sand favorable oil/gas exploration area regularity of distribution.
The step (1) is tested the porositys of different oil bearing grade reservoirs, permeability and is contained as a preferred technical solution,
Oily saturation degree the specific steps are:Live formation testing production material is collected, according to formation testing pilot production analysis result, divides oil reservoir, grease
Same layer, water layer and dried layer；It drills through the core sample of a diameter of 25mm respectively for oil reservoir, oil-water common-layer, water layer and dried layer, tests
Its porosity, permeability and oil saturation.
The concrete operation step of the step (4) includes as a preferred technical solution,：
For the cored interval of research layer position, system drills through the core sample of a diameter of 25mm, and tests its porosity Φ
With permeability K；
The fluxion strap index FZI of each sample is calculated using above-mentioned porosity Φ and permeability K, and to study layer position as unit
Seek the fluxion strap index FZI average values of each well location；
Average fluxion strap index FZI plane equivalences are drawn, according to the fluxion strap index lower limit of oil reservoir and oil-water common-layer
Value, predicts the tight sand favorable oil/gas exploration area regularity of distribution of different stage.
It compares and the prior art, the beneficial effects of the present invention are：
1, the present invention utilizes fluxion strap index FZI to combine the present invention in different oil bearing grade hole storage porosity, permeability for the first time
With oil saturation etc., the tight sand favorable oil/gas exploration area regularity of distribution of quantitative forecast different stage improves prediction essence
Degree, reduces tight sand oil-gas exploration and development risk；
2, method and step of the invention is simple and practicable, operability and highly practical, is conducive in tight sand oil-gas exploration
Area promotes and applies.
Description of the drawings
Fig. 1 is the relational graph of the tight sand oil bearing grade and oil saturation of the embodiment of the present invention；
Fig. 2 is the relationship of the tight sand fluxion strap index and oil saturation of the embodiment of the present invention；
Fig. 3 is that the tight sand of the embodiment of the present invention is averaged fluxion strap index flat distribution map.
Specific implementation mode
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without making creative work belongs to the model that the present invention protects
It encloses.
An embodiment of the present invention provides a kind of method of quantitative forecast tight sand favorable oil/gas exploration area, specifically include as
Lower step：
S1：Test porosity, permeability and the oil saturation of different oil bearing grade reservoirs.
The present embodiment test obtains three important parameters, lays the foundation for subsequent method, specifically, being needed before test
Live formation testing production material is collected, according to formation testing pilot production analysis result, divides oil reservoir, oil-water common-layer, water layer and dried layer；In division
After the reservoir for stating different oil bearing grades, the core sample of a diameter of 25mm is drilled through respectively for oil reservoir, oil-water common-layer, water layer and dried layer
Product, porosity, permeability and the oil saturation of test sample.
S2：According to the oil saturation of different oil bearing grade reservoirs, under the oil saturation for determining oil reservoir and oil-water common-layer
Limit value；
According to the porosity and permeability of different oil bearing grade reservoirs, the fluxion strap index of different oil bearing grade reservoirs is calculated
FZI,
Fluxion strap index FZI is expressed as with porosity Φ and permeability K：FZI=RQI/Φr, wherein：RQIFor reservoir quality
Index, RQI=0.0314 (K/ Φ)0.5；ΦrFor hole and skeleton particle volume ratio, Φr=Φ/(1- Φ).
In this step, fluxion strap index value can be calculated by the specific test value of porosity and permeability, simultaneously
The corresponding oil saturation lower limiting value for obtaining oil reservoir and oil-water common-layer is carried out next by fluxion strap index value and other numerical value
The operation of step.
S3：Establish the correlativity between the fluxion strap index FZI and oil saturation of identical oil bearing grade reservoir, and root
According to the oil reservoir of above-mentioned determination and the oil saturation lower limiting value of oil-water common-layer, determine that tight sand favorable oil/gas exploration area is corresponding
Fluxion strap index FZI lower limiting values.
In this step, by by the relationship of fluxion strap index value and oil saturation value, utilize for the first time fluxion strap index with
Other parameters coordinate, and are more directly effectively analyzed and predicted, can so that quantitative forecast effect is good, and prediction accuracy is high.
S4：For research layer position, average fluxion strap index FZI flat distribution maps are drawn, in conjunction with tight sand favorable oil/gas
The corresponding fluxion strap index lower limiting value in exploration area, the prediction tight sand favorable oil/gas exploration area regularity of distribution.
In this step, by drawing flat distribution map, in conjunction with the lower limiting value of fluxion strap index, prediction that can be cheer and bright
The tight sand favorable oil/gas exploration area regularity of distribution.Specifically method includes：
For the cored interval of research layer position, system drills through the core sample of a diameter of 25mm, and tests its porosity Φ
With permeability K；
The fluxion strap index FZI of each sample is calculated using above-mentioned porosity Φ and permeability K, and to study layer position as unit
Seek the fluxion strap index FZI average values of each well location；
Average fluxion strap index FZI plane equivalences are drawn, according to the fluxion strap index lower limit of oil reservoir and oil-water common-layer
Value, predicts the tight sand favorable oil/gas exploration area regularity of distribution of different stage.
In order to become apparent from the quantitative forecast tight sand favorable oil/gas exploration introduced the embodiment of the present invention in detail and provided
The method in area, illustrates below with reference to specific embodiment.
By taking Jilin Oil Field somewhere Cretaceous System spring head four sections of tight sand oil and gas reservoirs of group as an example：
S1：According to research area's formation testing pilot production analysis result, oil reservoir, oil-water common-layer, water layer and dried layer are divided；For oil reservoir,
Oil-water common-layer, water layer and dried layer drill through the core sample of a diameter of 25mm respectively, and it is full to test its porosity, permeability and oil-containing
And degree.
S2：According to the test value of the corresponding oil saturation of different oil bearing grade reservoirs, oil reservoir and oil-water common-layer are determined
Oil saturation lower limit.As seen in Figure 1, four sections of tight sand oil reservoir oil-containings of Jilin Oil Field somewhere Cretaceous System spring head group
Saturation degree is generally more than 30%, and oil-water common-layer oil saturation is generally between 20%-30% (Fig. 1).Therefore, oil saturation
30% can be as the lower limit of advantageous exploration area as the lower limit of most favorable exploration areas, oil saturation 20%.
According to the porosity and permeability value of test sample in step S1, formula F ZI=[0.0314 (K/ Φ) is utilized0.5]/
[Φ/(1- Φ)], calculates the fluxion strap index FZI of each sample.
S3：Establish the correlativity between the fluxion strap index FZI and oil saturation of identical oil bearing grade reservoir, and root
According to the oil reservoir of above-mentioned determination and the oil saturation lower limiting value of oil-water common-layer, determine that tight sand favorable oil/gas exploration area is corresponding
Fluxion strap index lower limiting value.As seen in Figure 2, four sections of tight sandstone reservoir streams of Jilin Oil Field somewhere Cretaceous System spring head group
When dynamic band index FZI is less than 0.03, oil saturation is generally less than 20%；When fluxion strap index is 0.05-0.07, reservoir oil-containing
Saturation degree is predominately larger than 20%, and the oil saturation of quite a few reservoir is up to 30% or more；Fluxion strap index is more than
When 0.07, reservoir oil saturation is all higher than 30%.Therefore, fluxion strap index value 0.07 can be as under most favorable exploration areas
Limit, fluxion strap index value 0.05 can be as the lower limit of advantageous exploration area.
S5：For Jilin Oil Field somewhere Cretaceous System spring head four sections of tight sands of group, the porosity of each well section sample is tested
With permeability value, each well location fluxion strap index FZI average values are calculated, average fluxion strap index flat distribution map are drawn, referring to figure
3, prediction obtains the tight sand favorable oil/gas exploration area regularity of distribution, and Fig. 3 is shown, wherein fluxion strap index value is more than 0.07 area
Domain is most favorable exploration areas, and the region that fluxion strap index value is 0.05-0.07 is advantageous exploration area.
From above-described embodiment as can be seen that the present invention is saturated in different oil bearing grade reservoir porosities, permeability and oil-containing
Degree test on the basis of, using the corresponding oil saturation lower limit of favorable exploration areas as foundation, in conjunction with oil saturation with it is corresponding
Correlativity between fluxion strap index determines the corresponding fluxion strap index lower limit in tight sand favorable oil/gas exploration area, to
According to fluxion strap index flat distribution map, the tight sand favorable oil/gas exploration area regularity of distribution of different stage is predicted.This method
The prediction of tight sand favorable oil/gas exploration area is carried out by quantitative means, has improved precision of prediction, reduce tight sand
Oil-gas exploration and development risk, and step is simple and practicable, operability and highly practical, convenient in tight sand exploration areas
It promotes and applies.
Claims (3)
1. the method for quantitative forecast tight sand favorable oil/gas exploration area, which is characterized in that include the following steps：
(1) porosity, permeability and the oil saturation of different oil bearing grade reservoirs are tested；
(2) according to the oil saturation of different oil bearing grade reservoirs, the oil saturation lower limiting value of oil reservoir and oil-water common-layer is determined；
According to the porosity and permeability of different oil bearing grade reservoirs, the fluxion strap index FZI of different oil bearing grade reservoirs is calculated,
Fluxion strap index FZI is expressed as with porosity Φ and permeability K：FZI=RQI/Φr, wherein：RQIFor reservoir qualitative index,
RQI=0.0314 (K/ Φ)0.5；ΦrFor hole and skeleton particle volume ratio, Φr=Φ/(1- Φ)；
(3) correlativity between the fluxion strap index FZI and oil saturation of identical oil bearing grade reservoir is established, and according to upper
The oil saturation lower limiting value for stating determining oil reservoir and oil-water common-layer determines the corresponding flowing in tight sand favorable oil/gas exploration area
Band index FZI lower limiting values；
(4) it is directed to research layer position, average fluxion strap index FZI flat distribution maps is drawn, is explored in conjunction with tight sand favorable oil/gas
The corresponding fluxion strap index lower limiting value in area, the prediction tight sand favorable oil/gas exploration area regularity of distribution.
2. the method for quantitative forecast tight sand favorable oil/gas exploration area according to claim 1, which is characterized in that described
Step (1) test the porositys of different oil bearing grade reservoirs, permeability and oil saturation the specific steps are:Collect scene examination
Oily production material divides oil reservoir, oil-water common-layer, water layer and dried layer according to formation testing pilot production analysis result；It is same for oil reservoir, grease
Layer, water layer and dried layer drill through the core sample of a diameter of 25mm respectively, test its porosity, permeability and oil saturation.
3. the method for quantitative forecast tight sand favorable oil/gas exploration area according to claim 1, which is characterized in that described
The concrete operation step of step (4) includes：
For the cored interval of research layer position, system drills through the core sample of a diameter of 25mm, and tests its porosity Φ and ooze
Saturating rate K；
The fluxion strap index FZI of each sample is calculated using above-mentioned porosity Φ and permeability K, and is sought as unit using studying layer position
The fluxion strap index FZI average values of each well location；
Average fluxion strap index FZI plane equivalences are drawn, according to the fluxion strap index lower limiting value of oil reservoir and oil-water common-layer, in advance
Survey the tight sand favorable oil/gas exploration area regularity of distribution of different stage.
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| CN110748334B (en) * | 2019-09-04 | 2023-04-07 | 中国石油化工股份有限公司 | Method for predicting favorable area of shale oil and continuous oil reservoir exploration |
| CN111364982B (en) * | 2020-03-19 | 2023-08-01 | 中国石油化工股份有限公司 | Value method for oil saturation of tight sandstone |
| CN112526107B (en) * | 2020-11-27 | 2021-11-16 | 中国地质大学（北京） | Method for recognizing and quantitatively characterizing desserts in fractured compact sandstone reservoir |
| CN113109891A (en) * | 2021-04-14 | 2021-07-13 | 中国石油大学(华东) | Method for reconstructing evolution history of geologic fluid in sedimentary basin |
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