CN109492938A - A kind of deep carbonate reservoirs method for evaluating quality based on dessert indicator - Google Patents
A kind of deep carbonate reservoirs method for evaluating quality based on dessert indicator Download PDFInfo
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Abstract
The present invention relates to a kind of deep carbonate reservoirs method for evaluating quality based on dessert indicator, comprising the following steps: 1) obtains porosity, lithology, oil-gas possibility and the fracture density data of deep carbonate reservoirs respectively by log data；2) the dessert indicator F of deep carbonate reservoirs is obtained；3) according to the dessert indicator after normalizationEvaluate the quality of carbonate rock hydrocarbon reservoir reservoir.Compared with prior art, the present invention has many advantages, such as to be suitable for deep carbonate reservoirs, quantitative assessment.
Description
Technical field
The present invention relates to geophysics fields, store up more particularly, to a kind of Deep Carbonate Rocks based on dessert indicator
Layer method for evaluating quality.
Background technique
Deep Carbonate Rocks often there is reservoirs it is fine and close, heterogeneity is strong the features such as, therefore single rock physics ginseng
Number is difficult to carry out effective evaluation to reservoir quality.
Existing reservoir "sweet spot" indicator is primarily directed to conventional crumb rock reservoir, primary concern is that reservoir description
Parameter: porosity, permeability, saturation degree, it is very strong that these evaluation points are difficult to deep layer compact reservoir especially heterogeneity
Carbonate reservoir, be primarily due to single evaluation points and be difficult to distinguish deep layer High-quality Reservoir and common reservoir.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind to be indicated based on dessert
The deep carbonate reservoirs method for evaluating quality of the factor.
The purpose of the present invention can be achieved through the following technical solutions:
1. a kind of deep carbonate reservoirs method for evaluating quality based on dessert indicator, to indicate deep layer carbonic acid
The quality of salt oil gas pool reservoir, comprising the following steps:
1) porosity, lithology, oil-gas possibility and the crack for obtaining deep carbonate reservoirs respectively by log data are close
Degree evidence；
2) the dessert indicator F of deep carbonate reservoirs is obtained；
3) according to the dessert indicator after normalizationEvaluate the quality of carbonate rock hydrocarbon reservoir reservoir.
In the step 2), the expression formula of the dessert indicator F of deep carbonate reservoirs are as follows:
Wherein,For porosity, VdolomiteFor dolomite content, SwFor water saturation, Cr is fracture density.
In the step 2), according to the physical characterization of deep carbonate reservoirs dessert more sweet tea obtain dessert instruction because
Son, the physical characterization of the dessert more sweet tea specifically:
Since dolomitic resistance to compression real character and hole specific surface area are small, dolomitic content is got in carbonate reservoir
Height, then porosity is bigger, and oil-gas possibility is better.
Each single petrophysical parameter is evaluated reservoir quality and High-quality Reservoir display sensitivity is not high, therefore synthesis is examined
Considering these influences the petrophysical parameter of reservoir quality evaluation.In addition, according to the object of deep carbonate reservoirs " dessert more sweet tea "
Reason characterization obtains dessert indicator, the physical characterization of the dessert more sweet tea specifically:
Due to dolomitic resistance to compression real character and the lesser reason of hole specific surface area, dolomitic content is higher, hole
Porosity is also bigger, and oil-gas possibility is better.
The important parameter of control deep carbonate reservoirs permeance property: fracture spacing is also contemplated on this basis,
It is exactly that fracture spacing is higher, the permeance property of reservoir is better, is more conducive to the flowing and exploitation of oil-gas reservoir.
The step 3) specifically:
IfThen this section of Deep Carbonate Rocks are non-Reservoir Section；
IfThen determine this section of Deep Carbonate Rocks for Group III reservoir；
IfThen determine this section of Deep Carbonate Rocks for II class reservoir；
IfThen determine this section of Deep Carbonate Rocks for I class reservoir.
Compared with prior art, the invention has the following advantages that
One, be suitable for deep carbonate reservoirs: single geologic parameter or petrophysical parameter are difficult to deep layer carbonate
Rock reservoir carries out effective evaluation, and the evaluation of deep carbonate reservoirs dessert indicator proposed by the present invention comprehensively considers rock
Property, storage and collection performance, mobile performance and oil-gas possibility, be similar to " amplifier " and quantitative assessment equally carried out to reservoir quality；
Two, quantitative assessment: most of existing deep carbonate reservoirs quality evaluation be qualitatively, it is proposed by the present invention
Dessert indicator can go out quantitative assessment to deep carbonate reservoirs quality；
Three, deep carbonate reservoirs dessert indicator and elastic characteristic have preferable mapping relations, thus for based on
The reservoir quality quantitative assessment of pre-stack seismic inversion result and seismic elastic attribute provides new thinking.
Detailed description of the invention
Fig. 1 is the techniqueflow chart of the deep carbonate reservoirs dessert indicator based on log data.
Fig. 2 is the petrophysical parameter relationship based on NE Sichuan deep carbonate reservoirs log data, wherein figure
(2a) is dolomite content and porosity relationship, and figure (2b) is porosity and water saturation relationship.
Fig. 3 is the dessert indicator application effect figure of the calculating based on NE Sichuan Deep Carbonate Rocks log data.
Fig. 4 is elastic characteristic (p-wave impedance and P-S wave velocity ratio) phenogram of dessert evaluation points.
Description of symbols in figure:
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
The present invention passes through geological analysis to carbonate reservoir and petrophysical parameter statistics discovery, Deep Carbonate Rocks
There is the physical characterization of " dessert more sweet tea " between reservoir rock physical parameter, i.e., dolomitic content is got in carbonate reservoir
The rule high, porosity is bigger, fracture spacing is higher, permeability is higher, oil-gas possibility is better.Based on this geology characteristic and object
Reason rule, constructs the Deep Carbonate Rocks dessert indicator of these comprehensive petrophysical parameters, as reservoir quality
" amplifier " of evaluation, is used to indicate the quality of carbonate rock hydrocarbon reservoir reservoir.
The particular technique process and principle of the invention patent are as follows:
1) deep carbonate reservoirs Related Rocks physics and porosity, mineral content, oil-containing are obtained from log data
Gas related petrophysical parameter with fracture density.Since dolomite is more anti-than other mineral contents (such as limestone, cream rock)
Compacting, therefore porosity can be preferably saved, and bigger porosity often represents carbonate rock storage and collection performance under the depth
Better；At the same time, the higher rock of porosity, pore throat size is bigger, and corresponding capillary force is also smaller, on ground
Matter age oil gas is more advantageous to filling and enters, and oil-gas possibility also can be more preferable.At the same time, dolomite mineral are due to have passed through crystallization
Physical process, so its pore-size is often larger, specific surface area also can be smaller, thus adsorb water ratio it is relatively low and oily
Gas saturation is relatively high.Finally, the performance that transports of deep carbonate reservoirs depends primarily on the distribution density in crack, therefore split
Gap density can effectively indicate the mobile performance and permeability of rock.Here, fracture density can be according to porosity type inverting, electricity
Resistance rate imaging logging, core description obtain.
2) limited in the sensitivity of deep carbonate reservoirs due to each of the above petrophysical parameter, in order to amplify storage
The sensitivity of layer dessert instruction parameter, the dessert indicator proposed here, which comprehensively considers, above-mentioned has indicative significance to reservoir performance
Parameter, following reservoir "sweet spot" indicator expression formula can be obtained:
Wherein F is dessert indicator,For porosity, VdolomiteFor dolomite content, SwFor water saturation, Cr is
Fracture density.
3) the dessert indicator is applied to the log data in work area, and normalizing is carried out to the dessert indicator of calculating
Change processing, evaluates the reservoir quality of different geology intervals, and reservoir is classified and graded.
4) dessert evaluation points are used to demarcate rock elastic property (such as wave impedance, P-S wave velocity ratio in length and breadth), established
The mapping relations of dessert evaluation points and seismic elastic attribute, thus for based on pre-stack seismic inversion result or seismic elastic attribute
High-quality Reservoir prediction and reservoir quality evaluation lay the foundation.
As shown in FIG. 1, FIG. 1 is the deep carbonate reservoirs dessert indicator technical work streams based on log data
Journey, obtaining porosity, lithology (mainly dolomite content), oil-gas possibility from log data first (can be from containing water saturation
Degree obtains), fracture density (hole type inversion or resistivity logging can be passed through to obtain).Deep layer is obtained in conjunction with above-mentioned parameter
The dessert indicator of carbonate reservoir.
As shown in Fig. 2, Fig. 2 is the petrophysical parameter relationship based on NE Sichuan deep carbonate reservoirs log data
(2a) dolomite content and porosity relationship, (2b) porosity and water saturation relationship.Thus figure is as can be seen that dolomite contains
Measure that higher its porosity of rock is higher, and corresponding reservoir space is also bigger；And with the raising of porosity, rock contains water saturation
Degree then can accordingly decline, and correspond to the rising of rock oil-gas possibility.Such phenomenon discloses deep layer dolostone reservoirs and there is " dessert
The physical characterization of more sweet tea ", i.e., dolomite content is higher, porosity is bigger, permeability is higher, gas-bearing property is better, this is also deep layer
The physical basis that dessert indicator proposes.
As shown in figure 3, Fig. 3 is that dessert is calculated using the NE Sichuan deep carbonate reservoirs log data to indicate
The application effect of the factor.Fracture spacing therein be by being obtained based on acoustic speed-porosity porosity type inversion result,
And have already been through the calibration of core data.Wherein, dessert indicator >=0.5 it can regard I class reservoir, 0.5 > sweet tea as
Point indicator >=0.25 it can regard II class reservoir as, 0.25 > dessert indicator > 0 can regard Group III reservoir as, sweet tea
It is non-Reservoir Section that point indicator=0, which can be regarded as, this meets with the reservoir quality evaluation of classification in well logging geologic interpretation result
Preferably.This is also that the dessert indicator that newly proposes of the invention comprehensively considers lithology, porosity, water saturation, fracture density
Coefficient result.Simultaneously, it can be seen that dessert indicator higher position is also corresponding with the higher permeability of core actual measurement,
This also demonstrates the dessert indicator can indicate the mobile performance of reservoir well.
As shown in figure 4, Fig. 4 is the pass of the dessert evaluation points and p-wave impedance and P-S wave velocity ratio after normalization calculates
System.What the point of black represented is non-Reservoir Section, other colors selects the Reservoir Section for being dessert evaluation points greater than 0 represented, can
To see that the dessert evaluation points and elastic characteristic have preferable mapping relations, the point of non-Reservoir Section (dessert indicator=0)
There are very high p-wave impedance and P-S wave velocity ratio, Reservoir Section (dessert evaluation points > 0) has relatively low p-wave impedance and indulges
Shear wave velocity ratio, this also illustrates dessert indicator to a certain extent and can use elastic data to distinguish reservoir and non-reservoir.
At the same time, in Reservoir Section, the higher dessert indicator of numerical value has lower vertical compared to the lower dessert indicator of numerical value
Wave impedance and P-S wave velocity ratio, this is also that the reservoir quality quantitative forecast based on seismic elastic attribute is laid a good foundation.
Claims (4)
1. a kind of deep carbonate reservoirs method for evaluating quality based on dessert indicator, to indicate Deep Carbonate Rocks
The quality of oil-gas reservoir reservoir, which comprises the following steps:
1) porosity, lithology, oil-gas possibility and the fracture density number of deep carbonate reservoirs are obtained respectively by log data
According to；
2) the dessert indicator F of deep carbonate reservoirs is obtained；
3) according to the dessert indicator after normalizationEvaluate the quality of carbonate rock hydrocarbon reservoir reservoir.
2. a kind of deep carbonate reservoirs method for evaluating quality based on dessert indicator according to claim 1,
It is characterized in that, in the step 2), the expression formula of the dessert indicator F of deep carbonate reservoirs are as follows:
Wherein,For porosity, VdolomiteFor dolomite content, SwFor water saturation, Cr is fracture density.
3. a kind of deep carbonate reservoirs method for evaluating quality based on dessert indicator according to claim 1,
It is characterized in that, obtaining dessert instruction according to the physical characterization of deep carbonate reservoirs dessert more sweet tea in the step 2)
The factor, the physical characterization of the dessert more sweet tea specifically:
Since dolomitic resistance to compression real character and hole specific surface area are small, dolomitic content is higher in carbonate reservoir, then
Porosity is bigger, and oil-gas possibility is better.
4. a kind of deep carbonate reservoirs method for evaluating quality based on dessert indicator according to claim 2,
It is characterized in that, the step 3) specifically:
IfThen this section of Deep Carbonate Rocks are non-Reservoir Section；
IfThen determine this section of Deep Carbonate Rocks for Group III reservoir；
IfThen determine this section of Deep Carbonate Rocks for II class reservoir；
IfThen determine this section of Deep Carbonate Rocks for I class reservoir.
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