CN106932836A - A kind of method and system for evaluating shale gas gassiness abundance - Google Patents
A kind of method and system for evaluating shale gas gassiness abundance Download PDFInfo
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- CN106932836A CN106932836A CN201511020000.9A CN201511020000A CN106932836A CN 106932836 A CN106932836 A CN 106932836A CN 201511020000 A CN201511020000 A CN 201511020000A CN 106932836 A CN106932836 A CN 106932836A
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- 238000003795 desorption Methods 0.000 claims abstract description 17
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- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention provides a kind of method and system for evaluating shale gas gassiness abundance, the method includes：Total air content result is desorbed according to shale gas rock core, it is determined that effectively shale log response feature；According to effective shale log response feature, the data cross plot that log desorbs total air content with rock core is set up respectively；According to the data cross plot, select and maximally related two logs of shale gassiness abundance；According to two logs and the response relation of gassiness abundance, gassiness abundance curves are set up using optimum combination method；Site desorption gas analysis result and gassiness abundance curves are carried out into the matching analysis, the Core analysis of site desorption gas and gassiness abundance are set up, to analyze the applicability of gassiness abundance curves and determine the scope of application；According to shale gas well test result, verify gassiness abundance curves effect of field application and determine the extent of spreading amd application.The present invention can go out shale gas gassiness abundance just with Fast Evaluation.
Description
Technical field
The invention belongs to oil and gas exploration and development technique field, specifically, it is related to one kind to be used for
Evaluate the method and system of shale gas gassiness abundance.
Background technology
Shale gas reservoir is a kind of special hypotonic compact reservoir in low hole, it is necessary to using horizontal well technology and massive hydraulic fracturing skill
Art is exploited, and can just effectively achieve the scale of commercial mining.But whether shale gas reservoir possesses commercial mining
Value, closely bound up with shale gas reservoir gas-bearing amount size, air content is higher, possesses commercial mining ability stronger.
Thus, the air content and gassiness abundance of shale reservoir how are gone out using log information accurate evaluation, for referring to
The selection of fractured interval is led, improving the production capacity of fracturing effect and shale reservoir, is had great importance.
The content of the invention
To solve problem above, the invention provides a kind of method and system for evaluating shale gas gassiness abundance,
Go out shale gas gassiness abundance just for Fast Evaluation.
According to an aspect of the invention, there is provided a kind of method for evaluating shale gas gassiness abundance, including：
Total air content result is desorbed according to shale gas rock core, it is determined that effectively shale log response feature；
According to effective shale log response feature, the data that log desorbs total air content with rock core are set up respectively
Cross plot；
According to the data cross plot, select and maximally related two logs of shale gassiness abundance；
According to two logs and the response relation of gassiness abundance, gassiness is set up using optimum combination method
Abundance curves；
Site desorption gas analysis result and gassiness abundance curves are carried out into the matching analysis, site desorption gas is set up and is contained
The Core analysis of gas abundance, to analyze the applicability of gassiness abundance curves and determine the scope of application；
According to shale gas well test result, verify gassiness abundance curves effect of field application and determine popularization and application model
Enclose.
According to one embodiment of present invention, the data cross plot includes：
Rock core desorbs total air content-density relationship figure；
Rock core desorbs total air content-sound wave graph of a relation；
Rock core desorbs total air content-neutron graph of a relation；
Rock core desorbs total air content-resistivity relation figure.
According to one embodiment of present invention, according to the data cross plot, select and shale gassiness abundance most phase
Two logs for closing include：
Density log curve；
Neutron well logging curve.
According to one embodiment of present invention, it is close to select two logs maximally related with shale gassiness abundance
During degree log and neutron well logging curve, the gassiness abundance curves of foundation are：
GS=1/ (A*DEN*B*CNL)
Wherein, GS represents gassiness abundance, and DEN represents density, and CNL represents neutron density, and A, B are ground
Area's empirical coefficient.
According to one embodiment of present invention, using optimum combination method, also wrapped before setting up gassiness abundance curves
Include and log data is standardized：
By an emphasis prospect pit in research area as standard well；
By the shale upper stabilizer mud stone interval of the standard well as standardization interval, this section of log is set up
Frequency histogram；
Other mud stone interval log frequency histograms for logging well corresponding and the standard in area will be studied
The frequency histogram of well is contrasted, and determines standardized value.
According to one embodiment of present invention, using optimum combination method, also wrapped before setting up gassiness abundance curves
Include rejecting well collapse, the expanding log exceptional value for causing.
According to one embodiment of present invention, the regional experience coefficient is the phase between log and stripping gas
Relation number.
According to another aspect of the present invention, a kind of system for evaluating shale gas gassiness abundance is additionally provided,
Including：
Logging response character determining module, total air content result is desorbed according to shale gas rock core, it is determined that effectively shale
Logging response character；
Data cross plot sets up module, according to effective shale logging response character, log and rock is set up respectively
The heart desorbs the data cross plot of total air content；
Log determining module, according to the data cross plot, selects and shale gassiness abundance maximally related two
Bar log；
Gassiness abundance curves determining module, according to two logs and the response relation of gassiness abundance, adopts
Gassiness abundance curves are set up with optimum combination method；
Core analysis set up module, and site desorption gas analysis result and gassiness abundance curves are carried out into the matching analysis,
The Core analysis of site desorption gas and gassiness abundance are set up, to analyze the applicability of gassiness abundance curves and determine suitable
Use scope；
Authentication module, according to shale gas well test result, verifies gassiness abundance curves effect of field application and determines
The extent of spreading amd application.
According to one embodiment of present invention, the log determining module is according to the data cross plot, choosing
Selecting two logs maximally related with shale gassiness abundance includes：
Density log curve；
Neutron well logging curve.
According to one embodiment of present invention, the gassiness abundance curves determining module selection and shale gassiness abundance
When maximally related two logs are density log curve and neutron well logging curve, the gassiness abundance curves of foundation
For：
GS=1/ (A*DEN*B*CNL)
Wherein, GS represents gassiness abundance, and DEN represents density, and CNL represents neutron density, and A, B are ground
Area's empirical coefficient.
Beneficial effects of the present invention：
What the present invention was provided evaluates the method and system that shale gas gassiness abundance is indicated based on logging technique, with
Under technique effect：
(1) workable, identification is directly perceived, clear, can intuitively understand interval of interest gassiness abundance just,
For fractured horizontal well segmentation selects layer to provide abundant foundation；
(2) can save the well log interpretation time, improve gassiness abundance and evaluate accuracy；
(3) practical ranges are wide at the scene, can be used for the shale reservoir with identical geologic setting
This method evaluates shale gassiness abundance, can effectively save production cost.
Other features and advantages of the present invention will illustrate in the following description, also, partly from specification
In become apparent, or by implement the present invention and understand.The purpose of the present invention and other advantages can pass through
Specifically noted structure is realized and obtained in specification, claims and accompanying drawing.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment
Or the accompanying drawing wanted needed for description of the prior art does simple introduction：
Fig. 1 is method flow diagram according to an embodiment of the invention；
Fig. 2 is air content total according to one embodiment of present invention and density relationship figure；
Fig. 3 is sound wave and resistivity relation figure under different air contents according to an embodiment of the invention；
Fig. 4 is total air content and density relationship figure according to another embodiment of the invention；
Fig. 5 is total air content according to an embodiment of the invention and sound wave graph of a relation；
Fig. 6 is total air content according to an embodiment of the invention and neutron graph of a relation；
Fig. 7 is total air content according to an embodiment of the invention and resistivity relation figure；
Fig. 8 is the well density curve frequencies histogram of burnt page according to an embodiment of the invention 1；
Fig. 9 is the well density curve frequencies histogram of southern page according to an embodiment of the invention 1；
Figure 10 is the borehole logging tool curve synoptic diagram of burnt page according to an embodiment of the invention 1；
Figure 11 is gassiness abundance curves according to an embodiment of the invention and the total air content graph of a relation of resolution gas；
And
Figure 12 is Yellow Page according to an embodiment of the invention 1, Peng page 1 and the burnt well gassiness abundance curves of page 1
Result of calculation comparison diagram.
Specific embodiment
Describe embodiments of the present invention in detail below with reference to drawings and Examples, whereby to the present invention how
Application technology means solve technical problem, and reach the implementation process of technique effect and can fully understand and real according to this
Apply.As long as it should be noted that do not constitute conflict, in each embodiment and each embodiment in the present invention
Each feature can be combined with each other, and the technical scheme for being formed is within protection scope of the present invention.
It is as shown in Figure 1 the method flow diagram according to one embodiment of the present of invention, comes to this below with reference to Fig. 1
Invention is described in detail.
First, in step s 110, total air content result is desorbed according to shale gas rock core, it is determined that effectively shale
Log response feature.Specifically, as shown in Fig. 2 analysis the total air content in rammell and density between relation,
As can be seen that (being less than 1m when total air content is smaller3/ t) when, density value is relatively large, and total air content is higher
When (be more than 1m3/ t), density value is relatively small.As shown in figure 3, analyze in the case of different air contents sound wave with
The relation of resistivity can find, when air content is relatively low, sound wave value is low and resistivity is more of a relatively high.Through
Cross analysis and can obtain the log response feature of effective shale, i.e., total air content and density, sound wave, resistivity and in
The response relation of son etc..
Next, in the step s 120, according to effective shale log response feature, log is set up respectively
With the data cross plot that rock core parses total air content.Specifically, set up interval transit time (AC), neutron (CNL),
The data cross plot of the log such as density (DEN) and resistivity (RT) and total air content.As shown in Figure 4
For rock core desorbs total air content-density relationship figure, Fig. 5 show rock core and desorbs total air content-sound wave graph of a relation,
Fig. 6 show rock core and desorbs total air content-neutron graph of a relation, and Fig. 7 show rock core and desorbs total air content-resistance
Rate graph of a relation.Certain log is not limited to above-described 4 kinds, and the log related to total air content is equal
The data cross plot that corresponding log desorbs total air content with rock core can be drawn.
Next, in step s 130, according to data cross plot, selecting maximally related with shale gassiness abundance
Two logs.Specifically, from the number of the multiple logs drawn in the step s 120 and total air content
According in cross plot, two and the shale maximally related log of gassiness abundance are selected.For example, can be from Fig. 4-figure
The density log mostly concerned with total air content (shale gas gassiness abundance) is selected in 74 width data cross plots
Curve and neutron well logging curve, the mostly concerned shale gassiness abundance that refers to are best with the coefficient correlation of log.
In addition, from figure 3, it can be seen that when air content has differences, difference is not obvious between sound wave and resistivity,
Thus this two curves can not be chosen to evaluate air content abundance.Certainly, according to specific shale gas formation core
Parsing information, the log mostly concerned with the total air content of shale gas is likely to as other logs.
Next, in step S140, the response relation of two logs and gassiness abundance according to selection,
Gassiness abundance curves are set up using optimum combination method.
Specifically, in this step, using optimum combination method, setting up the detailed process of gassiness abundance curves such as
Under.In the log that selection is related to gassiness abundance, it is probably most that the log for selecting at the beginning is seemed
It is related curve.But as site desorption Gas content testing well increases, log and desorption Gas content phase
Closing property is it may happen that change, thus the log for selecting in step s 130 will may change.Cause
And, using optimum organization mode, by setting up multiple analytic methods, based on mostly concerned close of gassiness abundance
Degree log and neutron well logging Curve selection best practice, set up gassiness abundance curves computational methods.
It is excellent when the log mostly concerned with total air content selects density log curve and neutron well logging curve
The gassiness abundance curves that change is obtained are expressed as：
GS=1/ (A*DEN*B*CNL) (1)
Wherein, GS represents gassiness abundance, and DEN represents density, and CNL represents neutron density, and A, B are ground
Area's empirical coefficient.
In addition, it is noted that the corresponding borehole log data of DEN, CNL in formula (1) needs to carry out
Standardization.Specific standardization flow is as follows.The emphasis prospect pit of Selecting research area one as standard well,
If the burnt well of page 1 is used as standard well；With the shale upper stabilizer mud stone interval of the standard well as normalization layer
Section, sets up this section of frequency histogram of log, as shown in Figure 8；It is corresponding to other wells in research area
Mud stone interval log frequency histogram contrasted with the standard well, standardized value is determined, such as Fig. 9 institutes
It is shown as the log frequency histogram of the well of southern page 1.Comparison diagram 8 can find with Fig. 9, the density of the well of southern page 1
Peak value is 2.67g/cm3, the density peaks of the well of burnt page 1 are 2.72g/cm3, thus the southern well density of page 1 standard
Change value is+0.05g/cm3.The normalization step of other curves is similar to.
Further, optimum combination method is being used, is also including that rejecting well collapses before setting up gassiness abundance curves
Collapse, the expanding log exceptional value for causing.For example, well 2300-2302m sections of burnt page 1 as shown in Figure 10,
Wherein, CAL1 represents CAL, and GR represents gamma ray curve, and CNL represents neutron curve, AC tables
Show sound wave curve, DEN represents density curve, and MSFL represents resistivity logging, and LLS represents shallow lateral logging
Curve, LLD represents deep lateral log curve.CAL shows that this section of well there occurs expanding, the depth
The corresponding density curve of section has larger jump point, is exceptional value；Neutron curve also has the increase of certain amplitude, is
Exceptional value is, it is necessary to remove.
Further, regional experience coefficient A and B can be obtained by the following method.Specifically, relying on Fuling
The research that burnt masonry dam shale gas block is carried out, the region is marine facies shale formation, is this area because obtained from
Empirical coefficient；But because the research method can also be applied in other shale area, it is only limited by different regions differently
The influence of layer, the empirical coefficient would also vary from.The acquisition of the empirical coefficient is based on shown in Fig. 4-Fig. 7, by
Correlation between every log and stripping gas is different, thus takes its coefficient correlation, used as its experience system
Number, i.e. density log curve coefficient correlation also between stripping gas are the regional experience coefficient A of density log curve,
Coefficient correlation between neutron well logging curve and stripping gas is the regional experience coefficient B of neutron well logging curve.
Next, in step S150, site desorption gas analysis result is matched with gassiness abundance curves
Analysis, sets up the Core analysis of live resolution gas and gassiness abundance.Based on the Core analysis, gassiness abundance is analyzed
The applicability of curve, determines its scope of application.Specifically, several mouthfuls of Selecting research block has site desorption qi leel to analyse
The well logging (the burnt well of page 1,6,7,8 of selection) of data, the matching analysis are carried out with gassiness abundance curves data,
Set up the Core analysis of live resolution gas as shown in figure 11 and gassiness abundance.
After the Core analysis are set up, Peng page 1 well of the selection outside research block, using the meter of step S140
The method for calculating gassiness abundance curves, for checking the application effect of the Core analysis.Be can be seen that from the data of the well,
It is equally applicable to Peng's 1 well of page；Mode, can check the correctness and the scope of application of the Core analysis by that analogy.
Finally, in step S160, according to shale gas well test result, checking gassiness abundance curves scene should
With effect, its extent of spreading amd application is determined.
Specifically, the gassiness abundance curves calculated using step S140, with reference to oil testing result, deployment analysis.
The well of burnt page 1 in such as Figure 12, the gassiness indicative curve value that the well is calculated is of a relatively high, and high level is mainly distributed
In the hypomere of the well, depth is 2392-2415m, and this section of gas testing open-flow capacity is 15.5 ten thousand sides.Therefore, select
It is production development layer section and fractured interval to select the of a relatively high interval of gassiness of gassiness abundance curves instruction, to improving page
Rock reservoir yield has directive significance.
Below by way of a specific embodiment, the present invention will be described.As shown in figure 11, according to calculating
Gassiness abundance curves, with burnt masonry dam area the well of burnt page 1,6,7,8 and its periphery Peng River area Peng page 1
Well, the total air content of stripping gas of the well of Yellow Page 1 in yellow level ground area have carried out comparative analysis, it is found that the gassiness for calculating is rich
With the total air content of site desorption gas into positive correlation, gassiness abundance curves place high correspond to parsing and always contains degree
Tolerance is high, therefore, the gassiness abundance curves for finding out can objectively reflect the height of shale air content, by
This is visible, at the scene using the method, will be with very intuitively application effect and applied widely.
Figure 12 analyzes the shale gassiness abundance curves of different shale development blocks, and gassiness abundance curves can be effective
Differentiate shale gas-bearing formation；The well gassiness abundance curves value of burnt page 1 is higher in 2390-2414m, and thickness is larger, surely
It is qualitative good.Wherein, from the point of view of the gassiness abundance curves that the well of Yellow Page 1 is calculated, its value is relatively right, and from yield
On see, its daily output is very low, is 0.0417 × 104m3/ d, current well has been scrapped.Although Peng's page 1 well display
Also the characteristics of having preferable gassiness abundance, but its value is relatively low, and show thin layer and strong anisotropism, because
It is 2.5 × 10 and the primiparity daily output is relatively low4m3/ d, the continuously steady production time is shorter, is exploited by 1 year, current day
Produce 0.6 × 104m3/d.And the gassiness abundance curves of the burnt well of page 1 show relatively homogeneous and thickness is larger, because
And the well primiparity 15.5 × 104m3/ d, exploited by 1 year, and current daily production rate is 6 × 104m3/ d or so.
It is easy to implement based on logging technique evaluation shale gas gassiness abundance curves method that the present invention is provided, operability
By force, can realize going out shale gas gassiness abundance just using log Fast Evaluation using the method, improve shale
Gas gassiness abundance evaluates validity, improves and evaluates the degree of accuracy, effectively instructs pressure break to be segmented and selects layer, and improves pressure break
Effect, reduces invalid fractured interval and chooses, and obtains economic worth higher.
According to another aspect of the present invention, a kind of system for evaluating shale gas gassiness abundance is additionally provided,
The system include logging response character determining module, data cross plot set up module, log determining module,
Gassiness abundance curves determining module, Core analysis set up module and authentication module.
Wherein, logging response character determining module desorbs total air content result according to shale gas rock core, it is determined that effectively
Shale logging response character；Data cross plot sets up module, according to effective shale logging response character, sets up respectively
Log desorbs the data cross plot of total air content with rock core；Log determining module, according to data cross plot,
Selection and maximally related two logs of shale gassiness abundance；Gassiness abundance curves determining module is according to two surveys
Well curve and the response relation of gassiness abundance, gassiness abundance curves are set up using optimum combination method；Core analysis
Set up module carries out the matching analysis by site desorption gas analysis result and gassiness abundance curves, sets up site desorption gas
With the Core analysis of gassiness abundance, with analyze gassiness abundance curves applicability and determine the scope of application；Checking mould
Root tuber verifies gassiness abundance curves effect of field application and determines the extent of spreading amd application according to shale gas well test result.
According to one embodiment of present invention, log determining module is according to data cross plot, selection and shale
Maximally related two logs of gassiness abundance include density log curve and neutron well logging curve.
According to one embodiment of present invention, the selection of gassiness abundance curves determining module and shale gassiness abundance most phase
When two logs for closing are density log curve and neutron well logging curve, the gassiness abundance curves such as formula of foundation
(1) shown in
While it is disclosed that implementation method as above, but described content is only to facilitate understand the present invention
And the implementation method for using, it is not limited to the present invention.Technology people in any the technical field of the invention
Member, on the premise of spirit and scope disclosed in this invention are not departed from, can be in the formal and details implemented
On make any modification and change, but scope of patent protection of the invention still must be with appending claims institute
The scope for defining is defined.
Claims (10)
1. a kind of method for evaluating shale gas gassiness abundance, including：
Total air content result is desorbed according to shale gas rock core, it is determined that effectively shale log response feature；
According to effective shale log response feature, the data that log desorbs total air content with rock core are set up respectively
Cross plot；
According to the data cross plot, select and maximally related two logs of shale gassiness abundance；
According to two logs and the response relation of gassiness abundance, gassiness is set up using optimum combination method
Abundance curves；
Site desorption gas analysis result and gassiness abundance curves are carried out into the matching analysis, site desorption gas is set up and is contained
The Core analysis of gas abundance, to analyze the applicability of gassiness abundance curves and determine the scope of application；
According to shale gas well test result, verify gassiness abundance curves effect of field application and determine popularization and application model
Enclose.
2. method according to claim 1, it is characterised in that the data cross plot includes：
Rock core desorbs total air content-density relationship figure；
Rock core desorbs total air content-sound wave graph of a relation；
Rock core desorbs total air content-neutron graph of a relation；
Rock core desorbs total air content-resistivity relation figure.
3. method according to claim 2, it is characterised in that according to the data cross plot, selection
Two logs maximally related with shale gassiness abundance include：
Density log curve；
Neutron well logging curve.
4. method according to claim 3, it is characterised in that selection is most related to shale gassiness abundance
Two logs be density log curve and neutron well logging curve when, the gassiness abundance curves of foundation are：
GS=1/ (A*DEN*B*CNL)
Wherein, GS represents gassiness abundance, and DEN represents density, and CNL represents neutron density, and A, B are ground
Area's empirical coefficient.
5. the method according to claim 3 or 4, it is characterised in that use optimum combination method, build
Also include being standardized log data before vertical gassiness abundance curves：
By an emphasis prospect pit in research area as standard well；
By the shale upper stabilizer mud stone interval of the standard well as standardization interval, this section of log is set up
Frequency histogram；
Other mud stone interval log frequency histograms for logging well corresponding and the standard in area will be studied
The frequency histogram of well is contrasted, and determines standardized value.
6. the method according to any one of claim 3-5, it is characterised in that use optimum combination method,
Before setting up gassiness abundance curves also include reject well collapse, the expanding log exceptional value for causing.
7. method according to claim 4, it is characterised in that the regional experience coefficient is bent for well logging
Coefficient correlation between line and stripping gas.
8. a kind of system for evaluating shale gas gassiness abundance, including：
Logging response character determining module, total air content result is desorbed according to shale gas rock core, it is determined that effectively shale
Logging response character；
Data cross plot sets up module, according to effective shale logging response character, log and rock is set up respectively
The heart desorbs the data cross plot of total air content；
Log determining module, according to the data cross plot, selects and shale gassiness abundance maximally related two
Bar log；
Gassiness abundance curves determining module, according to two logs and the response relation of gassiness abundance, adopts
Gassiness abundance curves are set up with optimum combination method；
Core analysis set up module, and site desorption gas analysis result and gassiness abundance curves are carried out into the matching analysis,
The Core analysis of site desorption gas and gassiness abundance are set up, to analyze the applicability of gassiness abundance curves and determine suitable
Use scope；
Authentication module, according to shale gas well test result, verifies gassiness abundance curves effect of field application and determines
The extent of spreading amd application.
9. system according to claim 8, it is characterised in that the log determining module according to
The data cross plot, selects two logs maximally related with shale gassiness abundance to include：
Density log curve；
Neutron well logging curve.
10. system according to claim 9, it is characterised in that the gassiness abundance curves determining module
When selection is density log curve and neutron well logging curve with maximally related two logs of shale gassiness abundance,
The gassiness abundance curves of foundation are：
GS=1/ (A*DEN*B*CNL)
Wherein, GS represents gassiness abundance, and DEN represents density, and CNL represents neutron density, and A, B are ground
Area's empirical coefficient.
Priority Applications (1)
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