CN114114453B - Method for distinguishing type of sandstone cemented mineral - Google Patents
Method for distinguishing type of sandstone cemented mineral Download PDFInfo
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- CN114114453B CN114114453B CN202010881193.1A CN202010881193A CN114114453B CN 114114453 B CN114114453 B CN 114114453B CN 202010881193 A CN202010881193 A CN 202010881193A CN 114114453 B CN114114453 B CN 114114453B
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- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 57
- 239000011707 mineral Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000011435 rock Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 13
- 230000004044 response Effects 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 6
- 230000011218 segmentation Effects 0.000 claims abstract description 5
- 230000009471 action Effects 0.000 claims abstract description 4
- 239000004568 cement Substances 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 6
- 238000002441 X-ray diffraction Methods 0.000 claims description 3
- 229910021536 Zeolite Inorganic materials 0.000 claims description 3
- 229910001579 aluminosilicate mineral Inorganic materials 0.000 claims description 3
- 229910001748 carbonate mineral Inorganic materials 0.000 claims description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052600 sulfate mineral Inorganic materials 0.000 claims description 3
- 239000010457 zeolite Substances 0.000 claims description 3
- 208000019888 Circadian rhythm sleep disease Diseases 0.000 claims description 2
- 208000001456 Jet Lag Syndrome Diseases 0.000 claims description 2
- 208000033915 jet lag type circadian rhythm sleep disease Diseases 0.000 claims description 2
- 238000010586 diagram Methods 0.000 abstract description 3
- 238000011160 research Methods 0.000 description 9
- 239000004927 clay Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000005755 formation reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000011148 porous material Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 229910001567 cementite Inorganic materials 0.000 description 3
- 239000002734 clay mineral Substances 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000005251 gamma ray Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000002498 deadly effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000012850 discrimination method Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007431 microscopic evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
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- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
A method of discriminating between sandstone reservoir cementitious mineral types, comprising: obtaining a rock core sample, and tabletting the rock core sample to obtain a rock core sheet; observing and characterizing the rock core piece to obtain mineral type characteristics of cementing action of the rock core piece; forming a cementitious mineral type-log value intersection using the cementitious mineral type and the log values; according to the obtained intersection diagram of the type of the cementing mineral and the logging curve values, the logging curve response characteristics of various cementing substances are analyzed and judged, and then a database of the logging curve response characteristics of various cementing substances is obtained; and further obtaining logging parameters of the sandstone without the core section, and judging the cementing material type of the intersection map according to the intersection map segmentation areas of different cementing types of the intersection map.
Description
Technical Field
The invention relates to the field of petroleum geology, in particular to a method for distinguishing the type of cemented minerals of a sandstone reservoir.
Background
Cementing refers to the action of mineral matter precipitating in the interstices of the clastic deposit, forming authigenic minerals and consolidating the deposit into rock. The formation of cement can plug pores, degrading reservoir performance.
Cementing is typically performed early in diagenesis (contemporaneous and shallowly buried), with the cementing materials formed in different diagenesis stages, different aqueous environments of the formation being very different. The types of the formed cementitous minerals mainly include carbonate minerals, silicalite and aluminosilicate minerals, and zeolite and sulfate minerals. The content and type of cement may reflect the reservoir porosity, evolving characteristics of permeability, and type characteristics of pore water. Cementing can plug the pores and roar, playing a deadly destructive role in reservoir performance.
The early research mainly uses microscopic analysis means such as a slice, a scanning electron microscope, X-ray diffraction and the like to observe the type of the cemented mineral of physical data such as a rock core and the like, and distinguishes the type and the content of the cemented mineral by means of geological experience. However, this method is limited to wells and intervals with coring data, and for formations without coring, can only rely on geophysical data such as seismic and logging. The current seismic data has large transverse resolution and smaller longitudinal resolution, and can not meet the requirement of researching pore development scale. In contrast, logging data has larger longitudinal resolution, good continuity and convenient acquisition, and some sensitive logging curves have certain response to diagenetic effects through previous researches. Therefore, it is important to explore and establish a method for distinguishing the type of the cemented mineral by using logging data.
At present, a method for comprehensively judging the type of the sandstone cemented minerals by using a sheet and logging data has not been reported. Chinese patents CN201410106783.1 and CN201410645235.6, literature "imaging logging evidence of sandstone early core carbonate cementation" and the like disclose related art methods that utilize logging and lithogenesis. CN201410106783.1 is mainly used for establishing a quantitative characterization method of a sandstone reservoir diagenetic logging phase; CN201410645235.6 provides a diagenetic strength and mineral content identification method for the coring segment, not involving logging techniques; the literature "imaging logging evidence of early core carbonate cementing of sandstone" mainly uses imaging logging information to determine the calcareous cementing degree of sandstone, and does not relate to conventional logging techniques and other cemented mineral types.
Disclosure of Invention
To advance the study of the reservoir effect of sandstone reservoirs, the invention aims to classify the cemented mineral types of sandstone from sheet comprehensive study. On the basis of establishing the corresponding relation between the type of the cementing mineral and the logging information, the logging information is utilized to judge the type of the cementing mineral.
In a rock-matrix-like setting, different cemented minerals in sandstone can cause different logging response characteristics. For example, a large amount of clay cementation may cause an increase in natural Gamma (GR), acoustic transit time (AC), calcareous cementation may cause an increase in Resistivity (RD) and neutron Density (DEN), a decrease in acoustic transit time (AC), and the like. Therefore, on the basis of researching the corresponding characteristics of the logging of different types of cemented minerals, the corresponding relation can be established.
The method can ensure that the research on the cementing effect is not only limited to a coring section, but also can be used for carrying out the presumption judgment on the cementing effect characteristics at the non-coring layer in a research area, and provides a basis for developing reservoir research, oil and gas reservoir research and the like.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
according to one embodiment of the present invention, there is provided a method of discriminating between a sandstone reservoir cementitious mineral type, comprising:
(1) Obtaining a rock core sample, and tabletting the rock core sample to obtain a rock core sheet;
(2) Observing and characterizing the rock core piece to obtain mineral type characteristics of cementing action of the rock core piece;
(3) Classifying the cemented minerals according to the characteristics of the type of the cemented minerals to obtain the type of the cemented minerals;
(4) Performing single well correction and multi-well consistency correction on the logging curve;
(5) Reading log values of corresponding depths of all samples on the log obtained in the step (4) according to the type of the cementing mineral obtained in the step (3);
(6) Forming a cementitious mineral type-log intersection map using the cementitious mineral type obtained in step (3) and the log values obtained in step (5);
(7) According to the cementing mineral type-logging curve value intersection chart obtained in the step (6), analyzing and judging logging curve response characteristics of various cementing substances, and further obtaining a database of the logging curve response characteristics of various cementing substances;
(8) And (3) acquiring logging parameters of the sandstone of the non-core section, and judging the cementing material type according to the intersection diagram dividing regions of different cementing types of the intersection diagram of the step (7).
In a preferred embodiment of the invention, the rock chips of the method include, but are not limited to, plain rock chips, cast chips, cathodoluminescent chips, scanning electron microscope chips or X-ray diffraction chips.
In a preferred embodiment of the invention, the mineral type characteristics include, but are not limited to, knot material type and cement content.
In a preferred embodiment of the invention, the cementitious mineral types include, but are not limited to, carbonate minerals, silicalite and aluminosilicate minerals, and zeolite and sulfate minerals.
In a preferred embodiment of the present invention, the log values refer to logs that sensitively respond to changes in various cementing characteristics, including but not limited to sonic jet lag logging, resistivity logging, compensated neutron, compensated density, and natural gamma.
Acoustic time difference logging is a logging method for researching the geological profile of a well by utilizing the acoustic characteristics of different speed, amplitude, frequency and the like when acoustic waves propagate in different rocks. The time required by the sound wave to pass through the 1m rock stratum is recorded, the time difference of the stratum sliding wave is measured, and the time difference can be used for calculating the porosity of the stratum, the lithology of the stratum, the layer hold a service on the 49th day after one's death and the like.
Resistivity logging is a method of measuring rock resistivity by placing power electrodes and measurement electrodes at different locations in a borehole.
And (3) compensating neutron logging, namely emitting fast neutrons into the stratum in the well bore by using an isotope neutron source, and measuring the thermal neutrons which are slowed down by the stratum and scattered back to the well bore by using two thermal neutron detectors with different long and short source distances to obtain two counting rates. The ratio of the short source distance to the long source distance detector count rate mainly reflects the deceleration capacity of the stratum to fast neutrons, shows the change of the stratum hydrogen content, and further obtains neutron porosity and stratum porosity.
Compensation density logging refers to the use of a long-range and short-range dual detector arrangement to measure the intensity of gamma rays scattered and absorbed by the formation and reaching the detector. Since the intensity of scattered gamma rays received by the detector is related to the rock bulk density of the formation, it can be used to identify lithology, determine the porosity of the formation, and calculate the mineral content.
Natural gamma-ray logging refers to a method of measuring the natural gamma-ray intensity of a formation along a well bore. According to the logging curve, the geological section of the drilling hole can be divided, the sandstone shale content in the sandstone section can be determined, and the permeability of the rock stratum can be qualitatively judged.
In a preferred embodiment of the present invention, the intersection graph includes, but is not limited to, an acoustic transit time curve and resistivity curve intersection graph, a compensated neutron curve and compensated density curve intersection graph, a natural gamma curve and acoustic transit time curve intersection graph, an acoustic transit time curve and compensated density curve intersection graph. Preferably, the acoustic moveout curve meets the resistivity curve.
In a preferred embodiment of the invention, the classification of the cementitious mineral is performed by: if the cementing mineral A accounts for more than 65% of the total cementing materials, directly judging the type A of the cementing materials; if the B and C contents of the cementing minerals are close, such as B content-C content >7%, then B cementing material types are determined.
ADVANTAGEOUS EFFECTS OF INVENTION
The logging discrimination method of the sandstone cemented mineral type can be used for the cementing effect research of the coreless stratum, provides basis for developing the research of sandstone reservoir diagenesis, diagenesis environment, diagenesis evolution sequence and the like, and has certain application value in the petroleum exploration and development fields of reservoir evaluation and prediction, lithology oil and gas reservoirs and the like.
Drawings
FIG. 1 is a graph of acoustic moveout and resistivity intersection characteristics for a cementitious mineral type.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
In order to make the technical scheme and advantages of the present invention more clear, the scheme in the present invention will be clearly and completely described by examples.
Example 1 determination of type of reservoir cemented mineral of ancient sandstone section on certain Keratong basin
(1) Selecting a core sample of a sandstone section in a research area, and manufacturing a slice;
(2) According to geological conditions and geological experience, the type of the cemented mineral is mainly calcium cementation and clay cementation, and data are screened. The judgment standard is as follows: the content of the cementite or clay mineral is more than 65 percent, and the cementite or clay cementite is judged; the calcareous mineral content-clay mineral content is more than 7%, and the calcium cementation is judged; clay mineral content-calcareous mineral content > 7%, and clay cementation is judged;
(3) Carrying out single-well curve correction and multi-well consistency correction on the well curve of the sampled sample, and ensuring that the curve value is the true value of the stratum to be measured and the unified measurement and comparability of the inter-well curve;
(4) And reading each logging value corresponding to each sample on the logging curve, and forming a crossing graph to obtain a crossing graph of the acoustic time difference and resistivity crossing characteristic curve, as shown in figure 1. From fig. 1 it can be seen that the clay bonds and calcareous bonds are very evident in the segmentation areas in the intersection map: the compensating sound wave of the clay cementing layer is distributed at more than 230 mu s/m, and the resistivity value is mainly distributed at less than 32Ω -m; the acoustic wave time difference of the calcium cementing layer is less than 240 mu s/m, and the resistivity value is mainly distributed at more than 32Ω -m.
(5) And reading each logging value of the sandstone of the non-core section, and judging the cementing material type of the intersection map segmentation areas with different cementing types by referring to the intersection map segmentation areas.
In this example, the log values for the non-cored section of sandstone section of the ancient kingdom sandstone section reservoir on a certain Keratong basin are shown in Table 1 below:
TABLE 1
For the data line numbered 24, the rock had a calcareous cement content of 1%, a clay cement content of 15%,15% -1% = 14%, and this was considered to be clay cement because 14% > 7%.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (3)
1. A method of discriminating between sandstone reservoir cementitious mineral types, comprising:
(1) Obtaining a rock core sample, and tabletting the rock core sample to obtain a rock core sheet;
(2) Observing and characterizing the rock core piece to obtain mineral type characteristics of cementing action of the rock core piece;
(3) Classifying the cemented minerals according to the characteristics of the type of the cemented minerals to obtain the type of the cemented minerals;
(4) Performing single well correction and multi-well consistency correction on the logging curve;
(5) Reading log values of corresponding depths of all samples on the log obtained in the step (4) according to the type of the cementing mineral obtained in the step (3);
(6) Forming a cementitious mineral type-log intersection map using the cementitious mineral type obtained in step (3) and the log values obtained in step (5);
(7) According to the cementing mineral type-logging curve value intersection chart obtained in the step (6), analyzing and judging logging curve response characteristics of various cementing substances, and further obtaining a database of the logging curve response characteristics of various cementing substances;
(8) Acquiring logging parameters of the sandstone of the non-core section, judging the cementing material type of the intersection map segmentation areas according to the different cementing types of the intersection map of the step (7),
Wherein the intersection graph is an intersection graph of a sound wave time difference curve and a resistivity curve,
Wherein, the classification of the cemented minerals is carried out by the following method: if the cementing mineral A accounts for more than 65% of the total cementing materials, directly judging the type A of the cementing materials; if the content of the cementing minerals B and C is close, for example, the content of B and the content of C are more than 7 percent, the type of the cementing materials B is judged,
Wherein the mineral type characteristics include cementitious material type and cement content,
Wherein the cementitious mineral types include carbonate minerals, silicalite and aluminosilicate minerals, and zeolite and sulfate minerals.
2. The method of claim 1, wherein the rock chips of the method are plain rock flakes, cast flakes, cathodoluminescent flakes, scanning electron microscope flakes or X-ray diffraction flakes.
3. The method of claim 1 or 2, wherein the log values refer to logs that sensitively reflect changes in various cementing characteristics, including sonic jet lag logging, resistivity logging, compensated neutron, compensated density curve intersection, and natural gamma curve.
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| CN104698500A (en) * | 2015-04-07 | 2015-06-10 | 成都乔依赛斯石油科技有限公司 | Method for predicting reservoir lithogenous phase through geology and logging information |
| CN109031424A (en) * | 2018-08-06 | 2018-12-18 | 中国石油大学(华东) | A method of based on well logging Multiparameter low permeability reservoir Diagenetic Facies |
| CN109165375A (en) * | 2018-08-03 | 2019-01-08 | 中国石油天然气集团有限公司 | Basement rock Lithology Discrimination and Calculation of Physical Properties method and device |
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| US8005619B2 (en) * | 2008-04-11 | 2011-08-23 | Schlumberger Technology Corporation | Method of determining reservoir parameters |
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| CN104698500A (en) * | 2015-04-07 | 2015-06-10 | 成都乔依赛斯石油科技有限公司 | Method for predicting reservoir lithogenous phase through geology and logging information |
| CN109165375A (en) * | 2018-08-03 | 2019-01-08 | 中国石油天然气集团有限公司 | Basement rock Lithology Discrimination and Calculation of Physical Properties method and device |
| CN109031424A (en) * | 2018-08-06 | 2018-12-18 | 中国石油大学(华东) | A method of based on well logging Multiparameter low permeability reservoir Diagenetic Facies |
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