CN105240006B - A kind of oil-water layer identification method suitable for volcanic rock reservoir - Google Patents
A kind of oil-water layer identification method suitable for volcanic rock reservoir Download PDFInfo
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- CN105240006B CN105240006B CN201510717167.4A CN201510717167A CN105240006B CN 105240006 B CN105240006 B CN 105240006B CN 201510717167 A CN201510717167 A CN 201510717167A CN 105240006 B CN105240006 B CN 105240006B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000011435 rock Substances 0.000 title claims abstract description 20
- 238000001228 spectrum Methods 0.000 claims abstract description 80
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 56
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 56
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 55
- 230000005311 nuclear magnetism Effects 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 15
- 238000005481 NMR spectroscopy Methods 0.000 claims abstract description 12
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 239000004519 grease Substances 0.000 claims abstract description 6
- 238000004611 spectroscopical analysis Methods 0.000 claims description 7
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 6
- QWTDNUCVQCZILF-UHFFFAOYSA-N isopentane Chemical compound CCC(C)C QWTDNUCVQCZILF-UHFFFAOYSA-N 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 3
- 239000001273 butane Substances 0.000 claims description 3
- AFABGHUZZDYHJO-UHFFFAOYSA-N dimethyl butane Natural products CCCC(C)C AFABGHUZZDYHJO-UHFFFAOYSA-N 0.000 claims description 3
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 3
- 239000001294 propane Substances 0.000 claims description 3
- 238000007619 statistical method Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 description 9
- 238000005553 drilling Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 230000009545 invasion Effects 0.000 description 3
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- 230000010287 polarization Effects 0.000 description 2
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- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
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- 238000013507 mapping Methods 0.000 description 1
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Abstract
The invention discloses a kind of oil-water layer identification method suitable for volcanic rock reservoir, the oil-water layer identification method includes：Using the Nuclear Magnetic Resonance Logging of double stand-by period patterns, inversion procedure is carried out to echo and obtains high latency T2 spectrums and short stand-by period T2 spectrums, then carry out poor spectrum processing, obtains the Difference Spectrum of reflection hydrocarbon information；Integral Processing is carried out to Difference Spectrum and obtains Difference Spectrum porosity (Diff_Por)；Using gas detection logging data, sensibility of each the hydrocarbon component to oil-water-layer is determined, establish hydrocarbon character ratio (Ratio_C)；According to existing formation testing data, establish Difference Spectrum porosity and hydrocarbon character than cross plot, determine the distinguishing limit of oil-water-layer；To the stratum of grease conclusion to be identified, Difference Spectrum porosity and hydrocarbon character ratio are extracted by above-mentioned steps, effective identification to oil-water-layer is realized using the cross plot of foundation.The present invention is further processed to obtain Difference Spectrum porosity, then establish cross plot with the hydrocarbon character ratio obtained using Gas logging data, realizes the identification of the oil-water-layer of volcanic rock reservoir on the basis of the processing of nuclear-magnetism difference spectrum.
Description
Technical field
The present invention relates to the complex reservoir Logging Evaluation of Fractured Reservoir technical fields in oil exploration, are answered especially for lithology
A kind of oil-water layer identification side based on nuclear magnetic resonance log and gas measuring logging data in miscellaneous, low porosity and low permeability volcanic rock reservoir logging evaluation
Method.
Background technology
Volcanic rock reservoir oil-water layer identification is one of difficult point that current Well logging science encounters.Traditional well logging oil-water layer identification
Main method be resistivity method, this conventional method carries out the uncertain of fluid identification in volcanic rock reservoir to be increased, mainly
Show the following：
1st, greatly, the resistivity contrasts of different lithology are larger, this species diversity is sometimes up to several quantity for Volcanic uranium deposit variation
Grade, uncertainty is brought to volcanic rock oil-water layer identification；
2nd, the porosity type of volcanic rock reservoir is various, complex pore structure, in the case where variation of lithological is little, porosity
And its large change of resistivity caused by the variation of pore structure, further increase resistivity method identification fluid properties not
Certainty；
3rd, volcanic matrix porosity is usually relatively low, and shared ratio of the fluid in rock is smaller, and resistivity is surveyed
Well reduces the sensibility of the reflection of fluid；
4th, the depth of invasion of different types of reservoir changes greatly in drilling process, and invasion character is changeable.Drilling fluid filtrate
Intrusion cause the reduction of oil-water-layer resistivity contrast, the contrast that the inhomogeneity of intrusion not only causes oil-water-layer subtracts
It is small, and cause the diversity of invasion profile.
Due to identifying that volcanic rock oil-water-layer encounters some problems with traditional method, some non-resistive rates are used
Method carry out identification of hydrocarbon and just seem even more important.The oil-water layer identification of volcanic rock reservoir is a great problem of logging evaluation, is needed
It makes full use of the information of the various oil/gas shows such as routine, new loging technology, drilling well, well logging and is carried out to integrate, so as to effectively
Improve the success rate of volcanic rock reservoir oil-water layer identification.
Invention content
The technical problems to be solved by the invention are to provide a kind of oil-water layer identification method suitable for volcanic rock reservoir, energy
It is enough to realize in the case where traditional resistivity method effectively identify oil-water-layer, it handles to obtain difference using Nuclear Magnetic Resonance Logging
Porosity is composed, then cross plot is established with the hydrocarbon character ratio obtained using Gas logging data, realizes the oil-water-layer of volcanic rock reservoir
Effectively identification.
Its technical problem of the solution of the present invention is adopted the technical scheme that：
A kind of oil-water layer identification method suitable for volcanic rock reservoir, step include：
1) using the Nuclear Magnetic Resonance Logging of double stand-by period patterns, inversion procedure is carried out to echo and obtains high latency
T2 is composed and short stand-by period T2 spectrums, then carries out poor spectrum processing, obtains the Difference Spectrum of reflection hydrocarbon information；
2) Integral Processing is carried out to Difference Spectrum and obtains Difference Spectrum porosity (Diff_Por)；
3) it using gas detection logging data, determines sensibility of each the hydrocarbon component to oil-water-layer, establishes hydrocarbon character ratio (Ratio_
C)；
4) according to existing formation testing data, read respectively corresponding Difference Spectrum porosity and hydrocarbon character than characteristic value,
The cross plot of Difference Spectrum porosity (Diff_Por) and hydrocarbon character ratio (Ratio_C) is established, determines the distinguishing limit of oil-water-layer；
5) for the stratum of grease conclusion to be identified, calculated by above-mentioned steps point take Difference Spectrum porosity (Diff_Por) and
The characteristic value of hydrocarbon character ratio (Ratio_C), read above-mentioned corresponding Difference Spectrum porosity and hydrocarbon character than characteristic value, then
The differentiation of oil-water-layer is determined using established Difference Spectrum porosity (Diff_Por) and hydrocarbon character ratio (Ratio_C) cross plot
Boundary realizes effective identification to oil-water-layer by falling into the data point in distinguishing limit.
Further, in the step 1), difference spectrometry is to utilize the difference of the longitudinal relaxation time of water flooding indirectly
By a kind of separated method of water and oil gas, poor spectrum processing is that high latency T2 spectrums and short stand-by period T2 spectrums are carried out phase
Subtract, obtain difference spectrum signal.
Further, the high latency T2 spectrum high latencies selected as 10~15 seconds；The short stand-by period T2
Compose short stand-by period selected as 1~2 second, with ensure water by perfact polarization oil gas partial polarization.
Further, the nuclear-magnetism Difference Spectrum can ask for Difference Spectrum porosity (Diff_ by the method for integration
Por), a quantitative data are obtained for evaluating the oil-containing water information of reservoir：
In formula, S (T2) composed for nuclear-magnetism T2, Tmin and Tmax are respectively that T2 composes corresponding minimum time and maximum time.
Further, in the step 3), using the content of the different component in gas detection logging data, hydrocarbon character is established
Than (Ratio_C)：
Ratio_C=(C4+C5)/C3 (2)
In formula, C3 is propane content, and C4 is butane content, and C5 is isopentane content, and more than unit is ppm.
Further, in the step 4), using the characteristic value of nuclear-magnetism Difference Spectrum porosity (Diff_Por) as abscissa, with
The characteristic value of hydrocarbon character ratio (Ratio_C) is ordinate, establish nuclear-magnetism Difference Spectrum porosity and hydrocarbon character than cross plot.
Further, in the step 4), in cross plot determine oil-water-layer distinguishing limit, by following manner into
Row：
The regularity of distribution of statistical analysis oil reservoir, oil-water common-layer, water layer and dried layer in cross plot, according to the concentration of sampling point
Degree, is divided into four independent, non-cross regions；The intersection sampling point for extremely falling into other regions individually is rejected, repeats step
1) -3) re-read the characteristic value of nuclear-magnetism Difference Spectrum porosity and hydrocarbon character ratio, it is final determine analysis oil reservoir, oil-water common-layer,
The distinguishing limit in four regions of water layer and dried layer in cross plot.
The present invention is further processed to obtain Difference Spectrum porosity, then with surveying using gas on the basis of the processing of nuclear-magnetism difference spectrum
The hydrocarbon character ratio that data obtains establishes cross plot, realizes the identification of the oil-water-layer of volcanic rock reservoir.The present invention combines core
Two methods of the advantages of magnetic variation open score method gentle survey method, improves the coincidence rate of oil-water layer identification.
Description of the drawings
Fig. 1 is a kind of flow chart of oil-water layer identification method suitable for volcanic rock reservoir provided by the invention；
Fig. 2 is the oil layer recognition figure of the nuclear magnetic resonance difference spectrometry of the embodiment of the present invention；
Fig. 3 is the oil-water layer identification figure of the nuclear magnetic resonance difference spectrometry of the embodiment of the present invention；
Fig. 4 is that the gas of the embodiment of the present invention surveys oil reservoir and water layer identification figure of the hydrocarbon character than method；
Fig. 5 is that the nuclear-magnetism Difference Spectrum of the embodiment of the present invention and gas survey hydrocarbon character than identification oil-water-layer cross plot.
Specific embodiment
Below in conjunction with the accompanying drawings, specific embodiment provided by the invention is described in further detail.
Referring to Fig. 1, a kind of oil-water layer identification method suitable for volcanic rock reservoir provided in an embodiment of the present invention, including such as
Lower step：
Step 101：Using the Nuclear Magnetic Resonance Logging of double stand-by period patterns, when extraction high latency T2 is composed with short waiting
Between T2 compose, carry out poor spectrum processing, obtain the Difference Spectrum of reflection stratum oil and water information；
Poor spectrum processing is will to obtain high latency T2 spectrums and short stand-by period T2 spectrums to subtract each other.Length of nuclear magnetic resonance log etc.
Treat the stand-by period selected as of time T2 spectrums 10~15 seconds；The stand-by period selected as of short stand-by period T2 spectrums 1~2 second.
As shown in Figure 2, the oil layer recognition figure for the nuclear magnetic resonance difference spectrometry of the embodiment of the present invention.First is deep in figure
Degree, second is resistivity curve, third and fourth road is respectively long and short stand-by period T2 spectrums, and the 4th is obtains after poor spectrum processing
Difference T2 spectrum.As can be seen from FIG., the Difference Spectrum signal amplitude of oil reservoir is big, is typical reservoir characteristics.
As shown in Figure 3, the oil-water layer identification figure for the nuclear magnetic resonance difference spectrometry of the embodiment of the present invention.From the difference in figure
Spectrum signal can be seen, and the top Difference Spectrum signal amplitude on stratum is larger, and the amplitude of lower part is smaller, for typical top be oil, under
Portion is the oil-water common-layer feature of water.
Step 102：Integral Processing is carried out to Difference Spectrum and obtains Difference Spectrum porosity (Diff_Por)：
In formula, S (T2) is composed for nuclear-magnetism T2, and Tmin and Tmax are respectively that T2 composes corresponding minimum time and maximum time.
Step 103：Using gas detection logging data, sensibility of each the hydrocarbon component to oil-water-layer is determined, establish hydrocarbon character ratio
(Ratio_C)：
Ratio_C=(C4+C5)/C3 (2)
In formula, C3 is propane content, and C4 is butane content, and C5 is isopentane content, and more than unit is ppm.
Since gas surveys hydrocarbon composition of the measurement data in formation fluid, these gas are surveyed contained by parameter and reservoir
Fluid properties have very close relationship, according to hydrocarbon composition and content in fluid, establish special to the sensitive hydro carbons of oil-water-layer
Sign is than (Ratio_C), it can be determined that goes out the property of fluid in reservoir.
As shown in Figure 4, it surveys hydrocarbon character for gas and identifies figure than the oil reservoir and water layer of method.First is natural gamma in figure,
Second is depth, and third road is WELL LITHOLOGY section, and the 4th is resistivity, and the 5th is density, and the 6th surveys for gas, the
The seven hydrocarbon character ratios calculated for the present embodiment.As can be seen from FIG., the oil reservoir hydrocarbon character ratio on top is larger, lower part
Water layer hydrocarbon character ratio is smaller, can distinguish oil reservoir and water layer.
Step 104：According to existing formation testing data, Difference Spectrum porosity (Diff_Por) and hydrocarbon character ratio are extracted respectively
(Ratio_C) characteristic value, establish Difference Spectrum porosity and hydrocarbon character than cross plot, determine the distinguishing limit of oil-water-layer.
Specifically as shown in Figure 5.
Using cross plot come identification of hydrocarbon, the advantages of combining the gentle two kinds of grease recognition methods of survey method of difference spectrometry, carry
High oil-water-layer coincidence rate.
Wherein, establish Difference Spectrum porosity and hydrocarbon character than cross plot specific implementation method be：With nuclear-magnetism Difference Spectrum
The characteristic value of porosity (Diff_Por) is abscissa, will be above-mentioned using the characteristic value of hydrocarbon character ratio (Ratio_C) as ordinate
The coordinate points that two parameter is formed are mapped in X-Y coordinate figure, form an X-Y scatter plot.
Furthermore it determines the distinguishing limit of oil-water-layer, is carried out by following manner：Statistical analysis oil reservoir, oil-water common-layer, water layer
With the regularity of distribution of the dried layer in cross plot, according to the concentration degree of sampling point, it is divided into four independent, non-cross regions.
The intersection sampling point for extremely falling into other regions individually is rejected, step 101-103 is repeated, re-reads nuclear-magnetism Difference Spectrum porosity and hydrocarbon
Category feature than characteristic value, the area in final four regions in cross plot that determine analysis oil reservoir, oil-water common-layer, water layer and dried layer
Boundary.
Step 105：For the stratum of grease conclusion to be identified, step 101-103 is repeated, calculates the Difference Spectrum on stratum respectively
Porosity (Diff_Por) and hydrocarbon character ratio (Ratio_C), read the characteristic value of above-mentioned parameter, recycle established intersection
Figure realizes effective identification to oil-water-layer.
In the following, it is described in further details by the specific implementation situation to the present embodiment, to support that the present invention to be solved
Certainly the technical issues of.
1st, a certain goals research block is selected, formation testing, the well for having nuclear-magnetism data is chosen, utilizes double stand-by period patterns
Nuclear Magnetic Resonance Logging, extraction high latency T2 spectrums and short stand-by period T2 spectrums carry out poor spectrum processing, obtain reflection hydrocarbon information
Difference Spectrum.
2nd, to difference modal data, Difference Spectrum porosity is calculated as follows：
In formula, S (T2) composed for nuclear-magnetism T2, Tmin chooses 0.3ms, and Tmax chooses 3000ms.
3rd, using gas detection logging data, (C4+C5)/C3 ratios is calculated, obtain hydrocarbon character ratio (Ratio_C).
4th, statistics the Difference Spectrum porosity of Pressure Curve in Oil Testing Well and hydrocarbon character than characteristic value (such as following table), with nuclear-magnetism Difference Spectrum
The characteristic value of porosity (Diff_Por) is abscissa, is established and handed over as ordinate using the characteristic value of hydrocarbon character ratio (Ratio_C)
It can scheme.The distinguishing limit of oil-water-layer is determined according to formation testing conclusion.
5th, to the stratum of grease conclusion to be identified, Difference Spectrum porosity and hydrocarbon character ratio are calculated respectively, reads above-mentioned ginseng
Several characteristic value, using the characteristic value of nuclear-magnetism Difference Spectrum porosity (Diff_Por) as abscissa, with hydrocarbon character ratio (Ratio_C)
Characteristic value for ordinate, by Mapping of data points to cross plot, the conclusion that data point falls into that region is exactly the oil on stratum
Water layer conclusion.
It should be noted last that more than specific embodiment is merely illustrative of the technical solution of the present invention and unrestricted,
Although the present invention is described in detail with reference to example, it will be understood by those of ordinary skill in the art that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of technical solution of the present invention, should all cover
In scope of the presently claimed invention.
Claims (5)
- A kind of 1. oil-water layer identification method suitable for volcanic rock reservoir, which is characterized in that include the following steps：1) using the Nuclear Magnetic Resonance Logging of double stand-by period patterns, inversion procedure is carried out to echo and obtains high latency T2 spectrums It is composed with short stand-by period T2, then carries out poor spectrum processing, obtain the Difference Spectrum of reflection hydrocarbon stratum information；2) Integral Processing is carried out to Difference Spectrum and obtains Difference Spectrum porosity Diff_Por；In formula, S (T2) composed for nuclear-magnetism T2, Tmin and Tmax are respectively that T2 composes corresponding minimum time and maximum time；3) it using gas detection logging data, determines sensibility of each the hydrocarbon component to oil-water-layer, calculates hydrocarbon character and compare Ratio_C；Ratio_C=(C4+C5)/C3 (2)In formula, C3 is propane content, and C4 is butane content, and C5 is isopentane content, and more than unit is ppm；4) according to existing formation testing data, read respectively corresponding Difference Spectrum porosity and hydrocarbon character than characteristic value, establish Difference Spectrum porosity Diff_Por and cross plot of the hydrocarbon character than Ratio_C determine the distinguishing limit of oil-water-layer；5) for the stratum of grease conclusion to be identified, step 1) -3 is repeated), Difference Spectrum porosity Diff_Por and hydrocarbon are calculated respectively Category feature than Ratio_C, read above-mentioned corresponding Difference Spectrum porosity and hydrocarbon character than characteristic value, recycle established Difference Spectrum porosity Diff_Por determines the distinguishing limit of oil-water-layer with hydrocarbon character than Ratio_C cross plot, by falling into area Data point in boundary is the effective identification realized to oil-water-layer.
- 2. according to the method described in claim 1, it is characterized in that, in the step 1), difference spectrometry is to utilize ground indirectly For the difference of the longitudinal relaxation time of layer water by a kind of separated method of water and oil gas, poor spectrum processing is to compose high latency T2 Subtracted each other with short stand-by period T2 spectrums, obtain difference spectrum signal.
- 3. according to the method described in claim 2, it is characterized in that, high latency T2 spectrum high latencies selected as 10 ~15 seconds；The short stand-by period T2 composes short stand-by period selected as 1~2 second.
- 4. according to the method described in claim 1, it is characterized in that, in the step 4), with nuclear-magnetism Difference Spectrum porosity Diff_ The characteristic value of Por is abscissa, using characteristic value of the hydrocarbon character than Ratio_C as ordinate, establishes nuclear-magnetism Difference Spectrum porosity With hydrocarbon character than cross plot.
- 5. according to the method described in claim 1, it is characterized in that, in the step 4), oil-water-layer is determined in cross plot Distinguishing limit is carried out by following manner：The regularity of distribution of statistical analysis oil reservoir, oil-water common-layer, water layer and dried layer in cross plot according to the concentration degree of sampling point, is drawn It is divided into four independent, non-cross regions；Reject and extremely fall into the intersection sampling point in other regions individually, and repeat step 1)- 3) characteristic value of nuclear-magnetism Difference Spectrum porosity and hydrocarbon character ratio is re-read, it is final to determine analysis oil reservoir, oil-water common-layer, water layer With the distinguishing limit in four region of the dried layer in cross plot.
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Effective date of registration: 20201103 Address after: Intercontinental building, 16 ande Road, Dongcheng District, Beijing, 100007 Patentee after: PetroChina Company Limited Address before: 830013 Institute of Geophysics, No. 397, Beijing North Road, Urumqi, the Xinjiang Uygur Autonomous Region Patentee before: Chen Guojun |