CN107102377A - 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 invention provides a kind of method of quantitative forecast tight sand favorable oil/gas exploration area, it is related to oil and gas exploration and development field, tight sand oil gas Efficient Exploration can be promoted to develop, following steps are specifically included：(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 limit 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 limits in tight sand favorable oil/gas exploration area are determined；(4) for research layer position, average fluxion strap index FZI flat distribution maps are drawn, with reference to the corresponding fluxion strap index lower limit in tight sand favorable oil/gas exploration area, the prediction tight sand favorable oil/gas exploration area regularity of distribution.
Description
Technical field
Have the present invention relates to oil and gas exploration and development field, more particularly to a kind of quantitative forecast tight sand oil gas
The method of sharp exploration area.
Background technology
Tight sand oil gas achieves breakthrough as one of main Types of unconventional petroleum resources, in recent years exploration and development
Property progress, as " major fields " and " bright spot type " is produced 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, important discovery is also obtained 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, the diagenesis that tight sand often experienced complexity changes
Process is made, causes poor reservoir properties, pore throat character and its seepage characteristic complexity, anisotropism strong, so that oil-gas distribution
Complexity, the universal visible oil/gas show of different well locations, but resource abundance is low, oiliness spatial distribution differences big, adds fine and close sand
The difficulty and risk of rock oil-gas exploration and development.Therefore, it is to realize it is it to carry out tight sand oil and gas reservoir favorable exploratory area prediction
The key of Efficient Exploration exploitation.
The core of tight sand oil and gas reservoir favorable exploratory area prediction research is the preferred of evaluating.Sealing core drilling oil-containing
Saturation degree is reflection reservoir oiliness feature effective parameter the most directly perceived, is had to prediction favorable exploration areas distribution of crucial importance
Meaning.But, sealing core drilling process is complicated, cost is high, and oil saturation test process is cumbersome, is not easy to open on a large scale
Exhibition experiment, so that it can not be widely used in favorable exploratory area prediction research.At present, porosity and permeability is that sandstone reservoir is ground
Most there is obvious control action, Ke Yizhi to conventional sandstone reservoir oil saturation easily by testing the parameter obtained in studying carefully
Connect 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, and it is no longer the Dominated Factors containing saturation degree.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 the evaluation and foreca research of layer favorable exploration areas, 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, to the required precision more and more higher of favorable exploratory area prediction, merely with porosity and oozes
Saturating rate carries out favorable exploratory area prediction as evaluating can not meet demand, it is necessary to which it is preferred that more rational parameter comes anti-
The comprehensive characteristics such as physical property, pore throat character and the oiliness of tight sand oil and gas reservoir are reflected, a kind of simple and practical method is formed and enters
Predict row tight sand favorable oil/gas exploration area.
The content of the invention
It is an object of the invention to provide a kind of method of quantitative forecast tight sand favorable oil/gas exploration area, favorably to survey
The corresponding oil saturation lower limit in exploratory area is foundation, with reference to 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 so as to form tight sand favorable oil/gas
Exploratory area quantitative forecasting technique, promotes the exploitation of tight sand oil gas Efficient Exploration.
The invention provides a kind of method of quantitative forecast tight sand favorable oil/gas exploration area, following step is specifically included
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) dependency relation set up between the fluxion strap index FZI and oil saturation of identical oil bearing grade reservoir, and root
According to the oil reservoir and the oil saturation lower limit of oil-water common-layer of above-mentioned determination, determine that tight sand favorable oil/gas exploration area is corresponding
Fluxion strap index FZI lower limits.
(4) for research layer position, average fluxion strap index FZI flat distribution maps are drawn, with reference to tight sand favorable oil/gas
The corresponding fluxion strap index lower limit in exploration area, the prediction tight sand favorable oil/gas exploration area regularity of distribution.
As preferred technical scheme, the step (1) is tested the porositys of different oil bearing grade reservoirs, permeability and contained
Oily saturation degree is concretely comprised the following steps:Live formation testing production material is collected, according to formation testing pilot production analysis result, oil reservoir, profit is divided
Same layer, water layer and dried layer；Drill through a diameter of 25mm core sample respectively for oil reservoir, oil-water common-layer, water layer and dried layer, test
Its porosity, permeability and oil saturation.
As preferred technical scheme, the concrete operation step of the step (4) includes：
For the cored interval of research layer position, system drills through a diameter of 25mm core sample, 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 for unit
Ask for the fluxion strap index FZI average values of each well location；
Average fluxion strap index FZI plane equivalences are drawn, according to oil reservoir and the fluxion strap index lower limit of oil-water common-layer
Value, predicts the tight sand favorable oil/gas exploration area regularity of distribution of different stage.
Compare and prior art, the beneficial effects of the present invention are：
1st, the present invention combines the present invention in different oil bearing grade hole storage porosity, permeability using fluxion strap index FZI first
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；
2nd, method and step of the invention is simple and easy to apply, operability and practical, beneficial in tight sand oil-gas exploration
Area's popularization and application.
Brief description of the drawings
Fig. 1 is the tight sand oil bearing grade of the embodiment of the present invention and the graph of a relation of oil saturation；
Fig. 2 is the tight sand fluxion strap index of the embodiment of the present invention and the relation of oil saturation；
Fig. 3 is the tight sand fluxion strap index isopleth and favorable exploration areas distribution map of the embodiment of the present invention.
Embodiment
The technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described implementation
Example only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belongs to the model that the present invention is protected
Enclose.
The embodiments of the invention provide 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, is that follow-up method lays the foundation, specifically, being needed before test
Live formation testing production material is collected, according to formation testing pilot production analysis result, oil reservoir, oil-water common-layer, water layer and dried layer is divided；In division
After the reservoir for stating different oil bearing grades, a diameter of 25mm core sample 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, it can be calculated by the specific test value of porosity and permeability and obtain fluxion strap desired value, simultaneously
The corresponding oil saturation lower limit for obtaining oil reservoir and oil-water common-layer, is carried out next by fluxion strap desired value and other numerical value
The operation of step.
S3：The dependency relation set up between the fluxion strap index FZI and oil saturation of identical oil bearing grade reservoir, and root
According to the oil reservoir and the oil saturation lower limit of oil-water common-layer of above-mentioned determination, determine that tight sand favorable oil/gas exploration area is corresponding
Fluxion strap index FZI lower limits.
In this step, by by the relation of fluxion strap desired value and oil saturation value, first using fluxion strap index with
Other parameters coordinate, and are more directly effectively analyzed and are predicted, quantitative forecast effect can be caused good, and prediction accuracy is high.
S4：For research layer position, average fluxion strap index FZI flat distribution maps are drawn, with reference to tight sand favorable oil/gas
The corresponding fluxion strap index lower limit in exploration area, the prediction tight sand favorable oil/gas exploration area regularity of distribution.
,, can be with cheer and bright prediction with reference to the lower limit of fluxion strap index by drawing flat distribution map in this step
The tight sand favorable oil/gas exploration area regularity of distribution.Specific method includes：
For the cored interval of research layer position, system drills through a diameter of 25mm core sample, 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 for unit
Ask for the fluxion strap index FZI average values of each well location；
Average fluxion strap index FZI plane equivalences are drawn, according to oil reservoir and the fluxion strap index lower limit of 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 introducing the quantitative forecast tight sand favorable oil/gas exploration that the embodiment of the present invention is provided in detail
The method in area, is illustrated 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 a diameter of 25mm core sample 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 universal between 20%-30% (Fig. 1).Therefore, oil saturation
30% can as most favorable exploration areas lower limit, oil saturation 20% can as advantageous exploration area lower limit.
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：The dependency relation set up between the fluxion strap index FZI and oil saturation of identical oil bearing grade reservoir, and root
According to the oil reservoir and the oil saturation lower limit of oil-water common-layer of above-mentioned determination, determine that tight sand favorable oil/gas exploration area is corresponding
Fluxion strap index lower limit.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 quite a few reservoir oil saturation up to more than 30%；Fluxion strap index is more than
When 0.07, reservoir oil saturation is all higher than 30%.Therefore, fluxion strap desired value 0.07 can be as under most favorable exploration areas
Limit, fluxion strap desired value 0.05 can as advantageous exploration area lower limit.
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 desired value is more than 0.07 area
Domain is most favorable exploration areas, and the region that fluxion strap desired value is 0.05-0.07 is advantageous exploration area.
From above-described embodiment as can be seen that the present invention is in different oil bearing grade reservoir porosities, permeability and oil-containing saturation
Degree test on the basis of, using the corresponding oil saturation lower limit of favorable exploration areas as foundation, with reference to oil saturation with it is corresponding
Dependency relation between fluxion strap index, determines the corresponding fluxion strap index lower limit in tight sand favorable oil/gas exploration area, so that
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
Tight sand favorable oil/gas exploration area is carried out by quantitative means to predict, has improved precision of prediction, reduce tight sand
Oil-gas exploration and development risk, and step is simple and easy to apply, operability and practical is easy in tight sand exploration areas
Popularization and application.
Claims (3)
1. the method for quantitative forecast tight sand favorable oil/gas exploration area, it is characterised in that comprise 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 limit 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) dependency relation set up between the fluxion strap index FZI and oil saturation of identical oil bearing grade reservoir, and according to upper
The oil reservoir of determination and the oil saturation lower limit of oil-water common-layer are stated, the corresponding flowing in tight sand favorable oil/gas exploration area is determined
Band index FZI lower limits；
(4) for research layer position, average fluxion strap index FZI flat distribution maps are drawn, with reference to the exploration of tight sand favorable oil/gas
The corresponding fluxion strap index lower limit 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, it is characterised in that described
Step (1) tests concretely comprising the following steps for porosity, permeability and the oil saturation of different oil bearing grade reservoirs:Collect scene examination
Oily production material, according to formation testing pilot production analysis result, divides oil reservoir, oil-water common-layer, water layer and dried layer；It is same for oil reservoir, profit
Layer, water layer and dried layer drill through a diameter of 25mm core sample 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, it is characterised in that described
The concrete operation step of step (4) includes：
For the cored interval of research layer position, system drills through a diameter of 25mm core sample, 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 asked for studying layer position for unit
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, in advance
Survey the tight sand favorable oil/gas exploration area regularity of distribution of different stage.
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| CN111364982A (en) * | 2020-03-19 | 2020-07-03 | 中国石油化工股份有限公司 | Value taking method for oil saturation of tight sandstone |
| CN112415628A (en) * | 2019-08-20 | 2021-02-26 | 核工业二一六大队 | Sandstone-type uranium ore sampling plane distribution diagram mapping method |
| CN112526107A (en) * | 2020-11-27 | 2021-03-19 | 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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| 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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