CN106168685B - A kind of shale gas individual well geological syntheses evaluation method - Google Patents
A kind of shale gas individual well geological syntheses evaluation method Download PDFInfo
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Abstract
The present invention discloses a kind of shale gas individual well geological syntheses evaluation method, includes the following steps：Stratigraphic Division And Correlation and SEDIMENTARY FACIES ANALYSIS；Shale Gas Accumulation condition, Analysis The Main Control Factor；Shale Brittleness Analysis；Assessment for classification is carried out according to the shale gas evaluation parameters of chosen district table of suitable research area's exploration and development, finally preferably goes out advantageous interval, range of profitability.Technical solution using the present invention, objective it can comprehensively evaluate shale gas individual well geological condition, full and accurate reference is provided for later stage well exploitation, neighbouring shale gas individual well and shale gas geological region evaluation, break the limitation of existing evaluation method, shale gas individual well geological syntheses situation is specified, unnecessary waste is avoided.
Description
Technical field
The invention belongs to the technical field of shale gas exploration more particularly to a kind of shale gas individual well geological syntheses evaluation sides
Method.
Background technology
The U.S. is global shale gas exploration and development most successful country earliest.In the past 10 years, shale gas geological theory with survey
The important breakthrough and scale for visiting development technique promote and apply, and promote the U.S. and entire north America region shale gas reserves, yield quick
It is soaring, US natural gas supply source is changed, global energy supply situation is affected.U.S.'s shale gas yield is close within 2009
100000000000 m3, it is more than the annual output of China's conventional gas.About 172,000,000,000 m of U.S.'s shale gas annual output in 20113, it is the U.S. day
The 34% of right gas total output, about 19,000,000,000 m of Canadian shale gas annual output3, it is the 10% of Canadian natural gas total output.
In North America under the influence of shale gas development situation, all parts of the world area has carried out the exploration and development of shale gas one after another.
European Germany, France, Britain, Poland, Austria, Sweden in 2009 all start shale gas exploration and development plan, more than 40 families
Trans-corporation is engaged in shale gas development in Europe.Britain's declaration in 2011 is found that shale gas field in England northwestward,
Predict about 5.7 trillion m of shale gas reserves3。
Compared with North America, Chinese shale gas exploration is started late, but compared with other global areas, Chinese shale gas exploration
It maintains the leading position, the country of take the lead in realizing for area other than North America shale gas breakthrough and industrialization elder generation's property experiment.Domestic three
Major oil companies actively adjust structure and emphasis, and shale gas exploration and development is classified as to the first place of unconventional petroleum resources.
In recent years, the series of basic that China carries out for shale gas resource shows Chinese shale gas resource potential
It is huge.Since shale itself has low hole and the extremely low feature oozed, usually as the capping layer of oil-gas reservoir in previous research.
Thus shale gas is different from conventional gas, and the main occurrence form of shale gas is summarized as three kinds, i.e., with free state preservation in hole
In gap and crack, with ADSORPTION STATE preservation in organic matter and clay mineral grain surface, with solubilised state preservation in kerogen and pitch
In.But shale, based on free gas and adsorbed gas, the content of adsorbed gas is typically in the range of between 20%~85%, usually up to 50%
More than, therefore the method for traditional research conventional gas and oil is not suitable for the exploration and development of unconventional shale gas.Due to research contents
And focal point is inconsistent, it is most likely that causes to evaluate shale gas individual well geological syntheses inaccurate so that shale gas is surveyed
It is indefinite to visit target, waste of manpower and material resources.
Invention content
The technical problem to be solved by the present invention is to, a kind of shale gas individual well geological syntheses evaluation method is provided, it can be objective
Shale gas individual well geological condition is comprehensively evaluated, is later stage well exploitation, neighbouring shale gas individual well and shale gas areal geology
Evaluation provides full and accurate reference, breaks the limitation of existing evaluation method, specifies shale gas individual well geological syntheses situation, avoid
Unnecessary waste.
To solve the above problems, the present invention adopts the following technical scheme that：
A kind of shale gas individual well geological syntheses evaluation method, includes the following steps：
Step S1：Stratigraphic Division And Correlation and SEDIMENTARY FACIES ANALYSIS, include the following steps：
Step S1.1, the basic geological data and petroleum geology data in region residing for collection oil field, the region base
Matter data includes with petroleum geology data：Areal geology data, paleontologic analysis, outcrop data, drilling data, well logging money
Material, well-log information, seismic data and sample analysis test data,
Step S1.2, characteristics of the stratigraphic sequence and analysis of distribution：Pass through areal geology data, paleontologic analysis, well logging
Data and outcrop data carry out classification and correlation and divide stratum low frequency sequence,
Step S1.3, SEDIMENTARY FACIES ANALYSIS：Palaeo-environment analysis is carried out using sample analysis test data, is provided according to outcrop
Material, area deposition background information, core analyzing data determine type of sedimentary facies, according to outcrop data core analyzing data,
Well-log information and Microfacies Types establish the relationship between lithology and logging template, according to type of sedimentary facies, the relationship between lithology and logging template, well-log information and
Seismic data carries out electrofacies analysis and seismic facies analysis establishes shale gas individual well Sedimentary Facies composite columnar section,
Step S1.4, sedimentary facies planar distribution figure is drawn：On the basis of individual well SEDIMENTARY FACIES ANALYSIS, carry out depositing connected well pair
Than establishing sedimentary facies model, while pointing out the sedimentary micro be conducive to and region；
Step S2：Shale Gas Accumulation condition, Analysis The Main Control Factor, include the following steps：
Step S2.1, Characteristics of Hydrocarbon Source Rocks is analyzed：According to brill log data, region data, outcrop data and earthquake
Analysis shale distributed areas, thickness, buried depth；According to sample analysis test data analyze shale organic carbon (TOC) content,
Kerogen type, evolution level (Ro),
Step S2.2, reservoir characteristic is analyzed：Mineral type and content analysis are carried out according to sample analysis test data, are preserved
Analysis is oozed in spatial analysis, pore Structure Analysis and hole,
Step S2.3, cap rock and preservation condition are analyzed：Permeability, breakthrough pressure including breakthrough pressure test analysis shale
And break through, construction preservation condition, hydrogeologic condition,
Step S3, shale Brittleness Analysis：Shale Brittleness Analysis is carried out according to sample test analysis of data；
Step S4, Assessment for classification is carried out according to the shale gas evaluation parameters of chosen district table of suitable research area's exploration and development, finally
It is preferred that going out advantageous interval, range of profitability.
Preferably, the shale Brittleness Analysis in step S3 includes two aspects of qualitative analysis and quantitative analysis,
Qualitative analysis is as follows：
IRBI=(fQ+fCa)/(fQ+fCa+fCl+fK)
Wherein, IRBIFor relative brittleness index；fQ、fCa、fCl、fKFor quartz, carbonate mineral, total clay content, kerogen
Content,
Quantitative analysis is as follows:
Wherein, YMS is static Young's modulus；PRS is static Poisson's ratio；YM is normalized Young's modulus；PR is normalizing
The Poisson's ratio of change；BI is brittleness index.
Preferably, the sample analysis test data in step S1.1 includes petrology analysis of data, geochemistry
Analysis of data and fracturing experiments analysis of data.
In conclusion the beneficial effects of the invention are as follows：Be described in detail shale gas individual well geological syntheses evaluation flow with
And content, it completely uses this method objective can comprehensively evaluate shale gas individual well geological condition, is later stage well exploitation, adjacent
Nearly shale gas individual well and shale gas geological region evaluation provide full and accurate reference, break the limitation of existing evaluation method,
Shale gas individual well geological syntheses situation is specified, unnecessary waste is avoided.
Description of the drawings
Fig. 1 is shale gas individual well geological syntheses evaluation method flow chart；
Fig. 2 is Stratigraphic Division And Correlation and the flow chart of SEDIMENTARY FACIES ANALYSIS；
Fig. 3 is the schematic diagram of certain shale gas individual well STRATIGRAPHIC DIVISION；
Fig. 4 is five peak group Strata Comparison figure of somewhere；
Fig. 5 is somewhere Longma small stream group parameter distribution schematic diagram；
Fig. 6 is the schematic diagram of somewhere Longma small stream group palaeo-environment analysis；
Fig. 7 is somewhere Longma small stream group individual well sedimentary facies composite columnar section；
Fig. 8 is the connected well comparison diagram of somewhere Longma small stream group deposition；
Fig. 9 is that somewhere Longma small stream group deposits (micro-) phase plane spread figure；
Figure 10 is the flow chart of accumulating condition, Analysis The Main Control Factor；
Figure 11 is somewhere shale gas reservoir space schematic diagram；
Figure 12 is somewhere Longma small stream group shale gas pore structure characteristic schematic diagram；
Figure 13 is somewhere Longma small stream group porosity-permeability correlation figure；
Figure 14 is somewhere Longma small stream group shale thickness flat distribution map；
Figure 15 is somewhere Longma small stream group TOC content flat distribution maps；
Figure 16 is somewhere Longma small stream group thermal maturity flat distribution map；
Figure 17 is somewhere Longma small stream group air content flat distribution map；
Figure 18 is somewhere Longma small stream group shale gas favorable block distribution map.
Specific implementation mode
The present invention is described further in the following with reference to the drawings and specific embodiments.
The embodiment of the present invention provides a kind of shale gas individual well geological syntheses evaluation method, objective can comprehensively evaluate shale
Gas individual well geological condition provides full and accurate for later stage well exploitation, neighbouring shale gas individual well and shale gas geological region evaluation
Reference breaks the limitation of existing evaluation method, specifies shale gas individual well geological syntheses situation, avoids unnecessary waste；
During carrying out shale gas individual well geologic assessment, emphasis is needed to consider problems with：
(1) shale gas is the non-conventional gas of self-generation, self-reservoir, and Kerogen type, TOC contents, shale thickness, buries at thermal maturity
It is the substance of shale gas individual well geological syntheses evaluation deeply.Different types of kerogen is due to different chemical composition and knot
The product of structure, hydrocarbon potentiality and generation also differs；Thermal maturity (Ro) and total organic carbon (TOC) content are to determine shale production capacity
An important factor for；The thickness and buried depth of shale are the key factors for controlling Shale Gas Accumulation, and mud shale must reach certain thickness
And with the continuously distributed of sheet, enough air sources and reservoir space can be provided, effective hydrocarbon source rock can be formed in this way
And reservoir, shale thickness is bigger, more advantageous to gas reservoring；Larger buried depth can ensure suitable temperature and pressure
Power makes organic matter be converted to oil gas.
(2) it is mainly preserved in matrix pores and intrinsic fracture with larger porosity in the shale gas of free state, and
In shale gas then organic matter of the primary attachment in the rammell of porosity smaller (including nanoscale hole) and viscous of ADSORPTION STATE
Soil particle surface.Between being typically in the range of 20%~85% some researches show that the content of adsorbed gas, usually up to 50% or more.So
Research to the occurrence form and reservoir space of shale gas is the important content of shale gas individual well geological syntheses evaluation.
(3) there is low hole and the extremely low feature shale oozed itself not have any production capacity, need by artificial seam technology into
Row exploitation, the brittleness of shale is one of the important rock-mechanics property parameter that artificial seam must take into consideration, and evaluation shale
The important parameter of reservoir.
As shown in Figure 1, the present invention provides a kind of shale gas individual well geological syntheses evaluation method, include the following steps：
Step S1：Stratigraphic Division And Correlation and SEDIMENTARY FACIES ANALYSIS, as shown in Fig. 2, specifically including following steps：
Step S1.1, the basic geological data in region and petroleum geology data residing for oil field are collected.The region base
Geologic information includes with petroleum geology data：(tectonic characteristic, regional stratum development characteristics, region are heavy for areal geology data
Product background), paleontologic analysis, outcrop data, drilling data (well not, well location coordinate), log data, well-log information,
Shake data and sample analysis test data, the sample analysis test data include petrology analysis of data, geochemical credit
Analysis data and fracturing experiments analysis of data.
Step S1.2, characteristics of the stratigraphic sequence and analysis of distribution.The characteristics of the stratigraphic sequence and analysis of distribution packet
It includes and STRATIGRAPHIC DIVISION (as shown in Figure 3) is carried out by areal geology data, paleontologic analysis, well-log information and outcrop data
With Strata Comparison (as shown in Figure 4), and then divide stratum low frequency sequence.
Step S1.3, SEDIMENTARY FACIES ANALYSIS.The sedimentary facies model is established to carry out including the use of sample analysis test data
Palaeo-environment analysis, as shown in Figure 6；Comprehensive outcrop data, area deposition background information, core analyzing data determine sedimentary facies
(microfacies) type；In conjunction with outcrop data core analyzing data, well-log information and Microfacies Types, the relationship between lithology and logging mould is established
Plate；Comprehensive type of sedimentary facies, the relationship between lithology and logging template, well-log information and seismic data carry out electrofacies analysis and seismic facies analysis,
And then shale gas individual well Sedimentary Facies composite columnar section is established, as shown in Figure 7.
Step S1.3, sedimentary facies model is established, sedimentary facies (microfacies) planar distribution figure is drawn.In individual well SEDIMENTARY FACIES ANALYSIS base
On plinth, carry out depositing connected well comparison, as shown in figure 8, establishing sedimentary facies model, it is indicated that the sedimentary micro be conducive to and area
Domain, as shown in Figure 9.
Step S2, Shale Gas Accumulation condition, Analysis The Main Control Factor specifically include following steps as shown in Figure 10：
Step S2.1, Characteristics of Hydrocarbon Source Rocks is analyzed.The Characteristics of Hydrocarbon Source Rocks analysis includes according to brill log data, region data
(offset well data), outcrop data and seismic data analysis shale distributed areas, thickness, buried depth；It is surveyed in conjunction with sample analysis
Try organic carbon (TOC) content, Kerogen type, the evolution level (Ro) of analysis shale.
Step S2.2, reservoir characteristic is analyzed.The reservoir characteristic analysis includes the data according to sample analysis test data
Carry out mineral type and content analysis, reservoir space analysis (as shown in figure 11), pore Structure Analysis (as shown in figure 12) and
Ooze analysis (as shown in figure 13) in hole.
Step S2.3, cap rock and preservation condition are analyzed.The cap rock includes breakthrough pressure test point with preservation condition analysis
Analyse permeability, breakthrough pressure and the break through of shale, construction preservation condition, hydrogeologic condition.
Step S3, shale Brittleness Analysis.The shale Brittleness Analysis carries out shale brittleness according to sample test analysis of data
Analysis.Including two aspects of qualitative analysis and quantitative analysis.
Qualitative (sxemiquantitative) is analyzed：IRBI=(fQ+fCa)/(fQ+fCa+fCl+fK)
Wherein, IRBIFor relative brittleness index；fQ、fCa、fCl、fKFor quartz, carbonate mineral, total clay content, kerogen
Content.
Quantitative analysis:
Wherein, YMS is static Young's modulus；PRS is static Poisson's ratio；YM is normalized Young's modulus；PR is normalizing
The Poisson's ratio of change；BI is brittleness index.
Step S4, advantageous interval, range of profitability are preferred, propose exploration proposal.The advantageous interval, range of profitability are preferably
Assessment for classification is carried out according to the shale gas evaluation parameters of chosen district table (table 1) of suitable research area's exploration and development, is finally preferably gone out advantageous
Interval (on longitudinal direction), range of profitability (in plane), finally propose exploration proposal.
Table 1
It is included in having for evaluation index at present：Mud shale overall thickness, TOC contents, Ro, air content, is buried high-quality shale thickness
Deep, 8 parameters of major rupture development degree and orographic condition.It collects outcrop data, bore record well-log information, seismic data and sample
Product analyze test data, are arranged, are counted and fail-safe analysis；Draw corresponding graph：Mud shale overall thickness as shown in figure 14,
TOC contents are as shown in figure 15, Ro is as shown in figure 16, air content is as shown in figure 17；Each single factor test figure is overlapped, in conjunction with depth, major rupture
The single factor tests such as development degree and orographic condition preferably go out to have to carrying out in research area's individual well and plane shown in judge picture 18
The exploration and development interval of profit and region, it is final to propose lower step exploration proposal.
Above example is only exemplary embodiment of the present invention, is not used in the limitation present invention, protection scope of the present invention
It is defined by the claims.Those skilled in the art can within the spirit and scope of the present invention make respectively the present invention
Kind modification or equivalent replacement, this modification or equivalent replacement also should be regarded as being within the scope of the present invention.
Claims (3)
1. a kind of shale gas individual well geological syntheses evaluation method, which is characterized in that include the following steps：
Step S1：Stratigraphic Division And Correlation and SEDIMENTARY FACIES ANALYSIS, include the following steps：
Step S1.1, the basic geological data in region and petroleum geology data residing for oil field, the region base geology money are collected
Material with petroleum geology data includes：Areal geology data, paleontologic analysis, outcrop data, drilling data, log data,
Well-log information, seismic data and sample analysis test data,
Step S1.2, characteristics of the stratigraphic sequence and analysis of distribution：Pass through areal geology data, paleontologic analysis, well-log information
And outcrop data carries out classification and correlation and divides stratum low frequency sequence,
Step S1.3, SEDIMENTARY FACIES ANALYSIS：Using sample analysis test data carry out palaeo-environment analysis, according to outcrop data,
Area deposition background information, core analyzing data determine type of sedimentary facies, according to outcrop data core analyzing data, well logging
Data and Microfacies Types establish the relationship between lithology and logging template, according to type of sedimentary facies, the relationship between lithology and logging template, well-log information and earthquake
Data carries out electrofacies analysis and seismic facies analysis establishes shale gas individual well Sedimentary Facies composite columnar section,
Step S1.4, sedimentary facies planar distribution figure is drawn：On the basis of individual well SEDIMENTARY FACIES ANALYSIS, carry out depositing connected well comparison,
Sedimentary facies model is established, while pointing out the sedimentary micro be conducive to and region；
Step S2：Shale Gas Accumulation condition, Analysis The Main Control Factor, include the following steps：
Step S2.1, Characteristics of Hydrocarbon Source Rocks is analyzed：According to brill log data, region data, outcrop data and seismic data
Analyze shale distributed areas, thickness, buried depth；Organic carbon (TOC) content, the cheese of shale are analyzed according to sample analysis test data
Root type, evolution level (Ro),
Step S2.2, reservoir characteristic is analyzed：Mineral type and content analysis, reservoir space are carried out according to sample analysis test data
Analysis is oozed in analysis, pore Structure Analysis and hole,
Step S2.3, cap rock and preservation condition are analyzed：Permeability, breakthrough pressure including breakthrough pressure test analysis shale and
Break through, construction preservation condition, hydrogeologic condition,
Step S3, shale Brittleness Analysis：Shale Brittleness Analysis is carried out according to sample test analysis of data；
Step S4, Assessment for classification is carried out according to the shale gas evaluation parameters of chosen district table of suitable research area's exploration and development, it is last preferred
Go out advantageous interval, range of profitability.
2. shale gas individual well geological syntheses evaluation method as described in claim 1, which is characterized in that the shale in step S3 is crisp
Property analysis include qualitative analysis and quantitative analysis two in terms of,
Qualitative analysis is as follows：
IRBI=(fQ+fCa)/(fQ+fCa+fCl+fK)
Wherein, IRBIFor relative brittleness index；fQ、fCa、fCl、fKFor quartz, carbonate mineral, total clay content, kerogen contain
Amount,
Quantitative analysis is as follows:
Wherein, YMS is static Young's modulus；PRS is static Poisson's ratio；YM is normalized Young's modulus；PR is normalized
Poisson's ratio；BI is brittleness index.
3. shale gas individual well geological syntheses evaluation method as claimed in claim 1 or 2, which is characterized in that in step S1.1
The sample analysis test data includes petrology analysis of data, geochemical analysis data and fracturing experiments analysis of data.
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