CN104213899B - A kind of Logging Identification Method of formation rock skeleton - Google Patents

A kind of Logging Identification Method of formation rock skeleton Download PDF

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CN104213899B
CN104213899B CN201310218843.4A CN201310218843A CN104213899B CN 104213899 B CN104213899 B CN 104213899B CN 201310218843 A CN201310218843 A CN 201310218843A CN 104213899 B CN104213899 B CN 104213899B
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value
porosity
rock
rock matrix
density
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CN104213899A (en
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李�浩
魏修平
王丹丹
冯琼
陈萍
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China Petroleum and Chemical Corp
Sinopec Exploration and Production Research Institute
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China Petroleum and Chemical Corp
Sinopec Exploration and Production Research Institute
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Abstract

The invention provides a kind of Logging Identification Method of formation rock skeleton, belong to oil exploration, development field.The inventive method includes:The depth point that resistivity is found when tending to infinity, regard the log value of the depth point as rock matrix value;The rock matrix value includes interval transit time, compensation density and compensated neutron measured value;For the exploratory area for thering is core analysis to test, the check analysis of rock matrix value is carried out, the rock matrix value demonstrated by core experiment is obtained;The rock matrix value demonstrated by core experiment is applied to the unknown exploratory area of same lithology.The present invention is solved for target zone rock matrix is indefinite or mineralogical composition is complicated stratum, the problem of the problem of reservoir porosity can not accurately be solved is difficult to ask for rock matrix, the cost for obtaining complex lithology rock matrix is greatly reduced, the computational accuracy of reservoir porosity is improved.

Description

A kind of Logging Identification Method of formation rock skeleton
Technical field
The invention belongs to oil exploration, development field, it is related to the logging technique that identification reservoir porosity is calculated, and in particular to A kind of Logging Identification Method of formation rock skeleton.
Background technology
Acoustic velocity logging and density log are the most frequently used lithology-porosity logging methods.Want to be determined with porosity logging The lithology and porosity on stratum, just must be set up the response equation of acoustic velocity logging and density log.
At present popular acoustic velocity logging response equation, density log response equation form it is as follows successively:
It can thus be concluded that the porosity of clean rock is:
In formula:For rock porosity, decimal;Δ t is the acoustic wave of rock time difference of measurement, and unit is μ s/m;ΔtmaFor rock Stone skeleton interval transit time, unit is μ s/m;ΔtfFor the interval transit time of blowhole fluid, unit is μ s/m;For density hole Porosity, decimal;ρbTo measure the bulk density of rock, unit is g/cm3;ρmaFor matrix density, unit is g/cm3;ρfFor The bulk density of blowhole fluid, unit is g/cm3
Can be seen that from the calculation formula of porosity and accurately ask for acoustic wave of rock skeleton value or density skeleton value is accurately to ask Take the necessary condition of formation porosity.
For the less Within Monominerals rock of shale content, the sound wave skeleton or density skeleton of rock are easier to determine, but Because oil-gas exploration and development object is complicated, the lithology of target zone tends to complicated, and rock matrix is really permanent often to turn into well log interpretation New problem.Such as volcanic rock is different because of volcanic rock mineralogical composition, and the volcanic rocks skeletons of different regions exists inconsistent existing As such as shown in table 1 (Karamay oilfield difference volcanic rock porosity relational expression and litho-electric parameters (according to Xu Chunhua, 2007)). A kind of simple and accurate log analysis method of the problems demand is solved.
Table 1
Solution is mainly geochemical well logging now and analysis of coring obtains rock matrix, and not only cost is high for the above method, And be difficult to use, it is necessary to the replacement of cost effective method comprehensively in big work area.
The content of the invention
It is an object of the invention to solve problem present in above-mentioned prior art, there is provided a kind of survey of formation rock skeleton Well recognition methods, easy to operate, conclusion is reliable.
The present invention is achieved by the following technical solutions:
A kind of Logging Identification Method of formation rock skeleton, including:
The depth point that resistivity is found when tending to infinity, regard the log value of the depth point as rock matrix value;It is described Rock matrix value includes interval transit time, compensation density and compensated neutron measured value;
For the exploratory area for thering is core analysis to test, the check analysis of rock matrix value is carried out, obtains testing by core experiment The rock matrix value demonstrate,proved;
The rock matrix value demonstrated by core experiment is applied to the unknown exploratory area of same lithology.
The check analysis of the rock matrix value includes:
(1) the rock matrix value, is intersected into obtained rock bone with sound wave or density with using core analysis porosity Frame value does comparative analysis, obtains both uniformity;
(2) the rock matrix value, is inputted into porosity calculation formula, formation porosity is asked for;In known core hole, The computational accuracy of formation porosity according to the porosity of core analysis to being tried to achieve is examined again.
The utilization core analysis porosity intersects what obtained rock matrix value was realized in sound wave or density:
Core analysis porosity is classified by lithology:Under same lithology, according to the depth of core analysis porosity Angle value, finds acoustic logging value or density log value corresponding under the depth in log data;
Core analysis porosity value and the acoustic logging value are done two-dimentional cross plot, then with after fitting a straight line, y is obtained =kx+b relation, wherein y refer to interval transit time, and x refers to porosity, and when porosity x is zero, b is exactly interval transit time skeleton Value;
Equally, core analysis porosity value and the density log value are done two-dimentional cross plot, then with after fitting a straight line, Y=kx+b relation is obtained, wherein y refers to density, and x refers to porosity, and when porosity x is zero, b is exactly density skeleton value;
If the apparent density of core analysis, then the density value obtained in borehole log data is directly substituted with apparent density.
The porosity calculation formula is as follows:
Wherein,
In formula:For rock porosity, decimal;Δ t is the acoustic wave of rock time difference of measurement, and unit is μ s/m;ΔtmaFor rock Stone skeleton interval transit time, unit is μ s/m;ΔtfFor the interval transit time of blowhole fluid, unit is μ s/m;For density hole Porosity, decimal;ρbTo measure the bulk density of rock, unit is g/cm3;ρmaFor matrix density, unit is g/cm3;ρfFor The bulk density of blowhole fluid, unit is g/cm3
The computational accuracy refers to calculate obtained formation porosity and core analysis porosity one using rock matrix value The height of cause property.
It is this that the computational accuracy of formation porosity of the porosity according to core analysis to being tried to achieve is examined again What sample was realized:
Obtained formation porosity will be calculated and do relative error analysis with core analysis porosity, if relative error magnitudes are small In minimum reference value, then the rock core skeleton value is the rock matrix value demonstrated by core experiment.
The minimum reference value takes 10%.
It is described that the rock matrix value demonstrated by core experiment is applied into the unknown exploratory area of same lithology is such reality Existing:
The rock matrix value demonstrated by core experiment is substituted into the porosity calculation formula, same lithology is obtained The porosity in unknown exploratory area;The unknown exploratory area of same lithology refers to the lithology identical with the exploratory area for having core analysis to test Well, the interval transit time skeleton value or density skeleton value or neutron skeleton value in the exploratory area are unknown.
The resistivity tends to infinity and refers to that formation resistivity is more than 2000 ohm meters.
Compared with prior art, the beneficial effects of the invention are as follows:
The present invention is solved for target zone rock matrix is indefinite or mineralogical composition is complicated stratum, it is impossible to accurate to solve The problem of the problem of reservoir porosity, is difficult to ask for rock matrix;
This method is workable, the porosity calculated using this method, the core analysis porosity through known core hole Verified, research conclusion accurately and reliably, greatly reduces the cost for obtaining complex lithology rock matrix, improves reservoir pore space The computational accuracy of degree.
Brief description of the drawings
Fig. 1-1 is the rock matrix figure of tufa stone in log identification stratum.
Fig. 1-2 is the rock matrix figure of rhyolite in log identification stratum.
Fig. 2-1 is the core analysis density and porosity graph of a relation of rhyolite.
Fig. 2-2 is the core analysis density and porosity graph of a relation of tufa stone.
Fig. 3 is that X borehole logging tools explain porosity and the porosity comparison diagram of core analysis.
Fig. 4 is the step block diagram of the inventive method.
Fig. 5 is the porosity and core analysis porosity relative error schematic diagram that X wells are calculated.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings:
Formation rock skeleton ask for for it is accurate ask for formation porosity for, one to be emphasis in well log interpretation and Difficult point.Because target zone rock matrix is indefinite or mineralogical composition is complicated, and use geochemical well logging or analysis acquisition rock of coring Skeleton, not only cost is high, and is difficult to use comprehensively in big work area, so research speculates the rock for studying stratum with log Stone skeleton, is a new approach.The foundation of this method is that tight formation porosity goes to zero, and resistivity tends to be infinitely great, The porosity for now thinking the measuring point is negligible, therefore the measuring point can be considered formation rock skeletal point.This side Method is workable, and in tight sand, carbonate rock and igneous reservoirs can all have preferable application value there is provided can The formation rock skeleton acquiring method leaned on.
What the present invention was realized in:For target zone rock matrix is indefinite or mineralogical composition bad ground, it can attempt The rock matrix for studying stratum is speculated using log.It speculates that foundation is that tight formation porosity goes to zero, and resistance Rate tends to be infinitely great, and the porosity for now thinking the measuring point is negligible, therefore the measuring point can be considered formation rock Skeletal point.The formation rock skeleton value obtained using this method, can be intersected with using core analysis porosity with sound wave or density Obtained skeleton value is contrasted;The porosity precision calculated using this method, can use the core analysis hole of known core hole Porosity is verified, so as to realize the purpose accurately calculated for the porosity on unknown rock matrix stratum.
The well logging recognition of rock matrix:Lowest porosity log value corresponding to pure lithology point can be considered close to rock matrix Log value (the rock matrix log value is the theoretical value speculated, and the value is confirmed by lot of experimental data.Such as Fig. 2-1 and figure Shown in 2-2).When its corresponding resistivity tends to infinity, it is believed that porosity is ignored, the log value of this depth point (i.e. interval transit time, compensation density and compensated neutron measured value) can be considered rock matrix value.
As shown in figure 4, the inventive method includes:
(1) well logging of rock matrix value is determined:The depth that formation resistivity is more than 2000 ohm meters is read in practical application Point corresponding interval transit time, compensation density and compensated neutron measured value (these three values are all obtained from log), this Three values are rock matrix value;According to log quality or other aspects in general.If this three curve qualities are all It is very good, three skeleton values can be read;If there is log quality problems, then up-to-standard log is chosen, Read skeleton value.
(2) check analysis of rock matrix value.The checking is divided into two steps:
First, the rock matrix value for determining the above method is obtained with being intersected using core analysis porosity with sound wave or density Rock matrix value (core analysis porosity intersects with sound wave and is obtained by rock matrix:First have to a core analysis hole Porosity presses lithology different classifications.Under same lithology, according to the depth value of core analysis porosity, found in log data Corresponding acoustic logging value under the depth.Then core analysis porosity value and sound wave log value are done two-dimentional cross plot, one As can be appreciated that lithologic analysis porosity value increases with the increase of interval transit time, both approximately linear relations.Intended with straight line After conjunction, y=kx+b relation is obtained.General y refers to interval transit time, and x refers to porosity.So when porosity x is zero, b is just It is interval transit time skeleton value.Equally, core analysis porosity is intersected with density is also obtained by density skeleton value.Certainly such as Fruit has the apparent density of core analysis, and the density value obtained in borehole log data can be directly substituted with apparent density.) do to score Analysis (the relatively direct rock matrix value rock matrix value that namely this method introduction is obtained that is obtained by log and logical Cross the uniformity that core analysis porosity intersects obtained rock matrix value with sound wave, density.Present invention side is confirmed by contrasting The feasibility of method.);
2nd, for the exploratory area for having core analysis to test, the rock matrix value demonstrated by core experiment is inputted into hole Calculation formula is spent, formation porosity is asked for.In known core hole, according to the porosity of core analysis to above-mentioned porosity calculation Precision (rock matrix calculates obtained formation porosity and the height of core analysis porosity uniformity) is examined (to use again This kind of method calculates obtained formation porosity and does relative error analysis with core analysis porosity, and relative error average is less than 10% is believed that the formation porosity degree of accuracy that the rock matrix obtained with this kind of method calculating is obtained is higher.Such as accompanying drawing 5 Shown, 9.11%) its relative error average is.
Porosity calculation formula is as follows:
Wherein,
In formula:For rock porosity, decimal;Δ t is the acoustic wave of rock time difference of measurement, and unit is μ s/m;ΔtmaFor rock Stone skeleton interval transit time, unit is μ s/m;ΔtfFor the interval transit time of blowhole fluid, unit is μ s/m;For density hole Porosity, decimal;ρbTo measure the bulk density of rock, unit is g/cm3;ρmaFor matrix density, unit is g/cm3;ρfFor The bulk density of blowhole fluid, unit is g/cm3
(3) with the application in the unknown exploratory area of lithology:When above-mentioned well logging calculates porosity and core analysis porosity goodness of fit height (formation porosity does relative error analysis with core analysis porosity, and relative error average is less than 10% i.e. it is believed that the goodness of fit It is high), meeting well log interpretation precision, (formation porosity does relative error with core analysis porosity, and its average thinks less than 10% It is to meet well log interpretation precision) when, this method can be used for the unknown exploratory area of lithology (lithology identical well.The skeleton value of reading It is same lithology with uniformity.It is unknown to refer to that interval transit time skeleton value or density skeleton value or neutron skeleton value are unknown.) Porosity logging calculate, otherwise can not use this method.Other methods can only be explored again.
The present invention obtains the rock matrix of complex lithology by using log, solves and is difficult to ask for complex lithology The present situation of rock matrix is taken, this method is workable, the porosity calculated using this method, the rock core through known core hole point Analysis porosity is verified that research conclusion accurately and reliably, greatly reduces the cost for obtaining complex lithology rock matrix, improved The computational accuracy of reservoir porosity.
1st, log determines stratum rock matrix
Fig. 1-1 and Fig. 1-2 are the schematic diagrames that log recognizes formation rock skeleton.When the resistivity of fine and close lithology is more than During 2000 ohm meter, it is believed that its porosity can be neglected, porosity measured value now is lithology skeleton value.According to the party The different lithology skeleton value of 2 classes can be read in method, practical study on log.Density is respectively 2.62g/cm3With 2.67g/cm3.It is combined afterwards with geology, confirmation density skeleton is rhyolite for 2.62g/cm3's, and density skeleton is 2.67g/ Cm3's is that (geology determines that the area has rhyolite and two kinds of tufa stone is main to tufa stone by core observation combination rock-mineral analysis Lithology.The depth point of the above-mentioned two skeleton of well logging recognition is respectively in both lithology coring depth sections.).
2nd, the formation rock skeleton and core analysis porosity that well logging is determined intersect obtained rock matrix with density and done pair Than analysis
As shown in Figure 2, for rhyolite, intersected, linearly closed with core analysis porosity with core analysis density It is to be(linear relationship is the porosity and core analysis with core analysis to coefficient correlation These scatterplots fit what is come after density intersection.Can all there is individual coefficient correlation after fitting, to show the goodness of fit of fitting.) R= 0.879.WhenWhen, rhyolite density skeleton value is 2.626g/cm3, the density skeleton 2.62g/cm determined with well logging3Kissing Close.For tufa stone, intersected with core analysis porosity with core analysis density, obtaining linear relationship isCoefficient R2=0.9893.WhenWhen, tufa stone density skeleton value is 2.67g/ cm3, the density skeleton 2.67g/cm determined with well logging3It coincide very much.Therefore deduce that, for rock matrix is indefinite or ore deposit The target zone of thing complicated component, this method that rock matrix value is determined with log is accurate believable.
3rd, the porosity precision calculated according to the porosity of core analysis the rock matrix determined with well logging is examined again Test.
As seen from Figure 3, porosity and core analysis porosity (right number that stratum rock matrix is calculated are determined with well logging 4th column, shown in stain) it is basically identical.Therefore deduce that, the formation rock skeleton determined with logging well accurately and reliably, drops significantly The low cost for obtaining complex lithology rock matrix, improves the computational accuracy of reservoir porosity.
Above-mentioned technical proposal is one embodiment of the present invention, for those skilled in the art, at this On the basis of disclosure of the invention application process and principle, it is easy to make various types of improvement or deformation, this is not limited solely to Invent the method described by above-mentioned embodiment, therefore previously described mode is preferred, and and without limitation The meaning of property.

Claims (4)

1. a kind of Logging Identification Method of formation rock skeleton, it is characterised in that:Methods described includes:
The depth point that resistivity is found when tending to infinity, regard the log value of the depth point as rock matrix value;The rock Skeleton value includes interval transit time, compensation density and compensated neutron measured value;
For the exploratory area for thering is core analysis to test, the check analysis of rock matrix value is carried out, obtains demonstrating by core experiment Rock matrix value;
The rock matrix value demonstrated by core experiment is applied to the unknown exploratory area of same lithology,
Wherein, the check analysis of the rock matrix value includes:
(1) the rock matrix value, is intersected into obtained rock matrix value with sound wave or density with using core analysis porosity Comparative analysis is done, both uniformity are obtained;
(2) the rock matrix value, is inputted into porosity calculation formula, formation porosity is asked for;In known core hole, according to The computational accuracy of formation porosity of the porosity of core analysis to being tried to achieve is examined again,
Wherein, it is this that the computational accuracy of formation porosity of the porosity according to core analysis to being tried to achieve is examined again What sample was realized:Obtained formation porosity will be calculated and do relative error analysis with core analysis porosity, if relative error magnitudes Less than minimum reference value, then the rock matrix value is the rock matrix value demonstrated by core experiment;
Wherein, the minimum reference value takes 10%;
Wherein, the rock matrix value demonstrated by core experiment is applied into the unknown exploratory area of same lithology to be realized in 's:The rock matrix value demonstrated by core experiment is substituted into the porosity calculation formula, same lithology is obtained unknown The porosity in exploratory area;The unknown exploratory area of same lithology refers to the lithology identical well with the exploratory area for having core analysis to test, The interval transit time skeleton value or density skeleton value or neutron skeleton value in the exploratory area are unknown;
Wherein, the resistivity tend to infinity refer to formation resistivity be more than 2000 ohm meters;
Wherein, up-to-standard log is chosen, the log value for reading the depth point is used as the rock matrix value.
2. the Logging Identification Method of formation rock skeleton according to claim 1, it is characterised in that:The utilization rock core point Analysis porosity intersects what obtained rock matrix value was realized in sound wave or density:
Core analysis porosity is classified by lithology:Under same lithology, according to the depth value of core analysis porosity, Acoustic logging value or density log value corresponding under the depth is found in log data;
Core analysis porosity value and the acoustic logging value are done two-dimentional cross plot, then with after fitting a straight line, y=kx is obtained + b relation, wherein y refer to interval transit time, and x refers to porosity, and when porosity x is zero, b is exactly interval transit time skeleton value;
Equally, core analysis porosity value and density log value are done two-dimentional cross plot, then with after fitting a straight line, obtains y= Kx+b relation, wherein y refer to density, and x refers to porosity, and when porosity x is zero, b is exactly density skeleton value;
If the apparent density of core analysis, then the density value obtained in borehole log data is directly substituted with apparent density.
3. the Logging Identification Method of formation rock skeleton according to claim 2, it is characterised in that:The porosity calculation Formula is as follows:
Wherein,
In formula:For rock porosity, decimal;Δ t is the acoustic wave of rock time difference of measurement, and unit is μ s/m;ΔtmaFor rock matrix Interval transit time, unit is μ s/m;ΔtfFor the interval transit time of blowhole fluid, unit is μ s/m;It is small for density porosity Number;ρbTo measure the bulk density of rock, unit is g/cm3;ρmaFor matrix density, unit is g/cm3;ρfFor rock pore The bulk density of clearance flow body, unit is g/cm3
4. the Logging Identification Method of formation rock skeleton according to claim 1, it is characterised in that:The computational accuracy is Refer to the height that obtained formation porosity and core analysis porosity uniformity is calculated using rock matrix value.
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CN104948164B (en) * 2015-05-05 2017-06-16 中国海洋石油总公司 The acquisition methods of HTHP reservoir carbon dioxide stream volume density matrix parameter
CN105158802B (en) * 2015-08-21 2018-11-23 西南石油大学 Lacustrine Basins Gravity Flow Sediments well logging quantitative identification method
CN107301255B (en) * 2016-04-15 2021-01-05 中国石油化工股份有限公司 Method for calculating reservoir fracture porosity
CN107795320B (en) * 2016-09-05 2021-01-05 中国石油化工股份有限公司 Calculation method for horizontal well carbonate reservoir parameters
CN107605471B (en) * 2017-07-21 2020-06-09 中国石油天然气股份有限公司 Lake-facies carbonate rock lithology well logging quantitative identification method
CN107762483B (en) * 2017-11-02 2020-10-13 中国石油天然气集团公司 Fluid identification method based on correlation coefficient and envelope area of logging curve
CN110146409B (en) * 2019-05-09 2020-07-07 中国地质大学(武汉) Method for determining shale gas saturation based on density

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