CN112696197A - Oil field reservoir index curve construction method, system, equipment and storage medium - Google Patents
Oil field reservoir index curve construction method, system, equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a method, a system, equipment and a storage medium for constructing an index curve of an oil field reservoir, which comprises the following steps of 1, constructing a shale indication curve through a shallow lateral curve and a neutron logging curve; constructing a shale content curve through the shale indication curve and the shale content of the rock core; 2. obtaining the total porosity; further constructing a porosity curve; 3. obtaining a deep lateral curve, a shallow lateral curve, mud resistivity and a fracture index, and further constructing a fracture porosity indication curve; 4. carrying out value assignment from small to large on the oil-containing level of the logging rock debris according to the level from low to high so as to generate a rock debris logging indication curve; 5. acquiring an all-hydrocarbon curve of gas logging, and performing normalization processing to obtain an all-hydrocarbon indicating curve; 4. and (4) synthesizing the curves, wherein the parameters of each curve are 1-2, and constructing a reservoir index curve. The method can obviously indicate the oil-gas layer, improve the accuracy of well logging interpretation and evaluation, and meet the requirements of well logging reservoir evaluation and exploration.
Description
Technical Field
The invention belongs to the field of petroleum exploration, and relates to a method, a system, equipment and a storage medium for constructing an index curve of an oil field reservoir.
Background
In the existing oil field in China, due to the deposition particularity, the lithology is mainly granite conglomerate and mixed conglomerate, and the reservoir space is mainly of a crack-pore type. In the past exploration, the logging series are single because the logging series are not used as an exploration target layer, and the conventional logging is mainly used basically. Because the sedimentary parent rock mainly comes from metamorphic rocks in the Taigu world, the response characteristic difference of conventional logging information to a reservoir and a non-reservoir is very weak, a logging interpretation chart and a standard are difficult to establish all the time, the logging interpretation coincidence rate is lower and is only 72.4%, and the requirements of oil and gas exploration and development in the region cannot be met. Therefore, it is urgently needed to find a solution to the problem based on the existing data. On the basis of comprehensively and seriously combing the existing information by the members of the project group, the information of the shale content, the porosity, the cracks, the rock debris logging, the gas logging and the like is compared with the tested oil layer section, and the important role is played in the reservoir evaluation. But the single data has weak indication on the oil-gas reservoir, the reservoir is difficult to be accurately evaluated, the accuracy of well logging interpretation and evaluation is influenced, and the one-time interpretation coincidence rate is only 72.4%.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method, a system, equipment and a storage medium for constructing an index curve of an oil field reservoir, which can obviously indicate a hydrocarbon reservoir, improve the accuracy of well logging interpretation and evaluation and meet the requirements of well logging reservoir evaluation and exploration.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
an index curve construction method for an oil field reservoir comprises the following steps;
acquiring a shallow lateral curve, a neutron logging curve and core shale content, and constructing a shale indication curve through the shallow lateral curve and the neutron logging curve; constructing a shale content curve through the shale indication curve and the shale content of the rock core;
acquiring a density curve, a neutron logging curve and a time difference curve to obtain total porosity; acquiring a mudstone time difference value, a skeleton time difference value and a fluid time difference value, and constructing a porosity curve through the total porosity, the mudstone time difference value, the skeleton time difference value and the fluid time difference value;
thirdly, acquiring a deep lateral curve, a shallow lateral curve, mud resistivity and a fracture index, and further constructing a fracture porosity indication curve;
step four, acquiring the oil content level of the logging rock debris, and carrying out value assignment from small to large on the oil content level of the logging rock debris according to the level from low to high so as to generate a rock debris logging indication curve;
acquiring an all-hydrocarbon curve of the gas logging, and performing normalization processing to obtain an all-hydrocarbon indication curve;
and step six, integrating a shale content curve, a porosity curve, a fracture porosity indicating curve, a rock debris logging indicating curve and an all-hydrocarbon indicating curve, wherein the parameter of each curve is 1-2, and constructing a reservoir index curve.
Preferably, in the first step, the muddiness indication curve is: SHSHOW is CN/30-LOG10(RS), wherein CN is a neutron logging curve and RS is a shallow lateral curve;
the mud content curve is: VSH 38.119 EXP (1.1827 shlow).
Preferably, in step two, the total porosity is: PORT-2.904 DEN +0.516 CN +0.177 AC +0.888, where DEN is the density curve, CN is the neutron log curve, and AC is the time difference curve;
the porosity curve is: PORQ ═ PORT-VSH (TSH-TMA)/(TF-TMA), where TSH is mudstone time difference, TMA is framework time difference, and TF is fluid time difference.
Preferably, in step three, the cuttings logging indication curve is as follows:
wherein RT is a deep lateral curve, RS is a shallow lateral curve, Rmf is mud resistivity, and mf is a fracture index.
Preferably, in the fourth step, the oil grades of the logging cuttings are respectively non-display, fluorescence, oil stain, oil immersion, oil rich and oil full, and the grades are respectively assigned with the values of 0.5, 1, 1.1, 1.2, 1.3, 1.4 and 1.5.
Preferably, in step five, the total hydrocarbon indicator curve is: QTS ═ LOG10(QT) -LOG10(QTMIN))/(LOG10(QTMAX) -LOG10(QTMIN)), where QT is the total hydrocarbon curve, QTMAX is the maximum value of total hydrocarbons in a certain interval, and QTMIN is the minimum value of total hydrocarbons in a certain interval.
Preferably, in step six, TTS EXP (log (porq) ((1 + PORF)) (1+ QTS)/(log (vsh)))2) And the pore is effective porosity, the pore is a rock debris logging indication curve, the LITHLOG is a rock debris logging indication curve, the QTS is an all-hydrocarbon indication curve, and the VSH is a shale content curve.
An oilfield reservoir index curve construction system comprising:
the shale content curve construction module is used for acquiring a shallow lateral curve, a neutron logging curve and core shale content and constructing a shale indication curve through the shallow lateral curve and the neutron logging curve; constructing a shale content curve by using the shale indication curve and the shale content of the rock core;
the porosity curve construction module is used for acquiring a density curve, a neutron logging curve and a time difference curve to obtain total porosity; acquiring a mudstone time difference value, a skeleton time difference value and a fluid time difference value, and constructing a porosity curve through the total porosity, the mudstone time difference value, the skeleton time difference value and the fluid time difference value;
the fracture porosity indication curve construction module is used for acquiring a deep lateral curve, a shallow lateral curve, mud resistivity and a fracture index so as to construct a fracture porosity indication curve;
the formation cuttings logging indicating curve constructing module is used for acquiring a deep lateral curve, a shallow lateral curve, mud resistivity and a fracture index so as to construct a fracture porosity indicating curve;
the all-hydrocarbon indicating curve building module is used for obtaining an all-hydrocarbon curve of gas logging, and carrying out normalization processing to obtain an all-hydrocarbon indicating curve;
and the reservoir index curve construction module is used for integrating the shale content curve, the porosity curve, the fracture porosity indication curve, the rock debris logging indication curve and the total hydrocarbon indication curve to construct a reservoir index curve.
A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor when executing the computer program implementing the steps of the oilfield reservoir index curve construction method as in any one of the preceding claims.
A computer readable storage medium storing a computer program which when executed by a processor implements the steps of the oilfield reservoir index curve construction method as in any one of the previous claims.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the reservoir evaluation curves are collected, and because the parameters of each curve are 1-2, 5 curves can make relatively balanced contributions, so that no negative effect is generated, the effect of a certain parameter is amplified, and the judgment of the result is influenced, thereby forming a comprehensive evaluation curve, comprehensively evaluating the reservoir, improving the accuracy of well logging interpretation evaluation, and meeting the requirements of well logging reservoir evaluation and exploration.
Drawings
FIG. 1 is a flow chart for reservoir index curve construction according to the present invention;
FIG. 2 is a block diagram illustrating a logging process according to the present invention;
fig. 3 is a result diagram after module processing of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, the method for constructing an index curve of an oil field reservoir according to the present invention includes conventional logging data, and calculation results of reservoir parameters. Wherein the conventional logging data comprises conventional logging data such as deep resistivity, shallow resistivity, time difference, density, neutrons and the like; the logging information comprises the oil-bearing level of the rock debris and an all-hydrocarbon curve; the calculations of reservoir parameters include porosity and shale calculations.
(1) Formula for calculating mud content
Firstly, obtaining a shallow lateral curve, a neutron logging curve and core shale content, and constructing a shale indication curve by using the shallow lateral curve and the neutron logging curve, wherein the concrete formula is as follows:
SHSHOW＝CN/30-LOG10(RS)
secondly, establishing a shale content curve by using the shale indication curve and the shale content of the rock core, wherein the concrete formula is as follows:
VSH＝38.119*EXP(1.1827*SHSHOW)
(2) porosity curve
Firstly, on the basis of a rock core experiment, acquiring a density curve, a neutron logging curve and a time difference curve, and establishing a total porosity calculation formula, wherein the formula is as follows:
PORT＝-2.904*DEN+0.516*CN+0.177*AC+0.888
secondly, obtain difference, skeleton time difference and fluid time difference when the mudstone, construct the porosity curve through total porosity, difference, skeleton time difference and fluid time difference when the mudstone, the formula is as follows:
PORQ＝PORT-SH*(TSH-TMA)/(TF-TMA)
(3) fracture porosity indication curve
Obtaining a deep lateral curve, a shallow lateral curve, mud resistivity and a fracture index, and constructing a fracture porosity indication curve, wherein the formula is as follows:
(4) rock debris logging indicating curve
And acquiring the oil content level of the logging rock debris, giving different levels to different values, referring to the table 1, thereby generating a continuous curve, and determining the name of the curve as a rock debris logging indication curve LITHLOG.
TABLE 1 assigned table for different oil-bearing grades of rock debris logging
| Rank of | No display | Fluorescence | Oil stain | Oil stain | Oil immersion | Rich in oil | Saturated oil |
| Assignment of value | 0.5 | 1 | 1.1 | 1.2 | 1.3 | 1.4 | 1.5 |
(5) Total hydrocarbon indicating curve
Acquiring an all-hydrocarbon curve of gas logging, and generating an all-hydrocarbon indicating curve by utilizing the all-hydrocarbon curve of the gas logging and normalizing, wherein the formula is as follows:
QTS＝(LOG10(QT)-LOG10(QTMIN))/(LOG10(QTMAX)-LOG10(QTMIN))
(6) reservoir index curve
The reservoir index curve is a comprehensive shale content curve, a porosity curve, a fracture porosity indicating curve, a rock debris logging indicating curve and a total hydrocarbon indicating curve, and the reservoir index curve is constructed according to the following formula:
TTS＝EXP(LOG(PORQ)*(1+PORF)*LITHLOG*(1+QTS)/(LOG(VSH))2)
in the above formula, SHSHOW is a mudness indication curve, VSH is a calculated mudness content, PORT is a total porosity, PORQ is an effective porosity, TSH is a mudstone time difference, TMA is a framework time difference, TF is a fluid time difference, RT is a deep lateral curve, RS is a shallow lateral curve, DEN is a density curve, CN is a neutron curve, AC is a time difference curve, Rmf is a mud resistivity, mf is a fracture index, PORF is a fracture porosity indication curve, QTS is an all-hydrocarbon indication curve, QT is an all-hydrocarbon curve, QTMAX is an all-hydrocarbon maximum value of a certain interval, and QTMIN is an all-hydrocarbon minimum value of a certain interval.
The above formula can be compiled into codes by using languages such as FORTRAN or C on the well logging interpretation processing software, and then compiled into a well logging interpretation module to be hung on the software, as shown in fig. 2. The application processing and interpreting module can process a single well and input a deep lateral curve (RT), a shallow lateral curve (RS), a time difference curve (AC), a neutron Curve (CN), a density curve (DEN), a rock debris logging indication curve (LITHLOG), an all-hydrocarbon indication curve (QTS), a porosity curve (PORQ), a shale content curve (VSH) and a fracture porosity curve (PORF). Note: the porosity curve (PORQ), the shale content curve (VSH) and the fracture porosity curve (PORF) do not need to be calculated by the formula if the calculation results are ready; the rock fragment logging indicating curve (LITHLOG) is a continuous curve generated by displaying the grade through rock fragment logging oil gas according to the assignment table. Because the maximum and minimum values of different well sections of the total hydrocarbon indicating curve (QTS) are inconsistent, the processing needs to be carried out in a segmented mode. Wherein TTS is a constructed reservoir indication curve (TTS). The final result diagram is shown in fig. 3, the TTS curve at the last step is the constructed reservoir index curve, the hydrocarbon reservoir can be evaluated by using the value of the curve, and if the non-reservoir lithology (such as mudstone and the like) can be deducted by combining the logging rock recognition result, the effect is better.
In the process of project research, a logging interpretation chart and a standard which are established on the basis of a reservoir index curve are utilized, wherein the reservoir index of an oil layer in a group II is more than 4, a poor oil layer is 2-4, and a dry layer is below 2.5; group III is slightly different, the reservoir index of the oil layer is more than 3.7, the poor oil layer is 2-4, and the dry layer is below 2.5. By utilizing the standard, 202 wells in the whole area are secondarily explained, on the basis of the secondary explanation, 29 layers of 22 wells which have tested oil are counted, wherein 26 layers are in accordance, 3 layers are not in accordance, the secondary explanation coincidence rate of the well logging is improved to 89.6%, the first explanation coincidence rate is compared with 72.4%, the second explanation coincidence rate is improved by 17.2%, and the reserve capacity reporting work of the research area is powerfully supported. Meanwhile, the seismic interpreter utilizes the constructed reservoir index curve to perform reservoir inversion, effectively predicts the distribution range of the reservoir and lays a good foundation for subsequent exploration.
An oilfield reservoir index curve construction system comprising:
the shale content curve construction module is used for acquiring a shallow lateral curve, a neutron logging curve and core shale content and constructing a shale indication curve through the shallow lateral curve and the neutron logging curve; constructing a shale content curve by using the shale indication curve and the shale content of the rock core;
the porosity curve construction module is used for acquiring a density curve, a neutron logging curve and a time difference curve to obtain total porosity; acquiring a mudstone time difference value, a skeleton time difference value and a fluid time difference value, and constructing a porosity curve through the total porosity, the mudstone time difference value, the skeleton time difference value and the fluid time difference value;
the fracture porosity indication curve construction module is used for acquiring a deep lateral curve, a shallow lateral curve, mud resistivity and a fracture index so as to construct a fracture porosity indication curve;
the formation cuttings logging indicating curve constructing module is used for acquiring a deep lateral curve, a shallow lateral curve, mud resistivity and a fracture index so as to construct a fracture porosity indicating curve;
the all-hydrocarbon indicating curve building module is used for obtaining an all-hydrocarbon curve of gas logging, and carrying out normalization processing to obtain an all-hydrocarbon indicating curve;
and the reservoir index curve construction module is used for integrating the shale content curve, the porosity curve, the fracture porosity indication curve, the rock debris logging indication curve and the total hydrocarbon indication curve to construct a reservoir index curve.
A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor when executing the computer program implementing the steps of the oilfield reservoir index curve construction method as described above.
A computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the oilfield reservoir index curve construction method as described above.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. An oilfield reservoir index curve construction method is characterized by comprising the following steps;
acquiring a shallow lateral curve, a neutron logging curve and core shale content, and constructing a shale indication curve through the shallow lateral curve and the neutron logging curve; constructing a shale content curve through the shale indication curve and the shale content of the rock core;
acquiring a density curve, a neutron logging curve and a time difference curve to obtain total porosity; acquiring a mudstone time difference value, a skeleton time difference value and a fluid time difference value, and constructing a porosity curve through the total porosity, the mudstone time difference value, the skeleton time difference value and the fluid time difference value;
thirdly, acquiring a deep lateral curve, a shallow lateral curve, mud resistivity and a fracture index, and further constructing a fracture porosity indication curve;
step four, acquiring the oil content level of the logging rock debris, and carrying out value assignment from small to large on the oil content level of the logging rock debris according to the level from low to high so as to generate a rock debris logging indication curve;
acquiring an all-hydrocarbon curve of the gas logging, and performing normalization processing to obtain an all-hydrocarbon indication curve;
and step six, integrating a shale content curve, a porosity curve, a fracture porosity indicating curve, a rock debris logging indicating curve and an all-hydrocarbon indicating curve, wherein the parameter of each curve is 1-2, and constructing a reservoir index curve.
2. The oilfield reservoir index curve construction method of claim 1, wherein in the first step, the shale indication curve is: SHSHOW is CN/30-LOG10(RS), wherein CN is a neutron logging curve and RS is a shallow lateral curve;
the mud content curve is: VSH 38.119 EXP (1.1827 shlow).
3. The oilfield reservoir index curve construction method of claim 1, wherein in step two, the total porosity is: PORT-2.904 DEN +0.516 CN +0.177 AC +0.888, where DEN is the density curve, CN is the neutron log curve, and AC is the time difference curve;
the porosity curve is: PORQ ═ PORT-VSH (TSH-TMA)/(TF-TMA), where TSH is mudstone time difference, TMA is framework time difference, and TF is fluid time difference.
4. The method for constructing the index curve of the oil field reservoir according to the claim 1, wherein in the third step, the rock fragment logging indication curve is as follows:
wherein RT is a deep lateral curve, RS is a shallow lateral curve, Rmf is mud resistivity, and mf is a fracture index.
5. The method for constructing the index curve of the oil field reservoir stratum according to claim 1, wherein in the fourth step, the oil-bearing grades of the logging cuttings are respectively non-display, fluorescence, oil stain, oil immersion, oil-rich and oil-saturated, and the evaluation values of the grades are respectively 0.5, 1, 1.1, 1.2, 1.3, 1.4 and 1.5.
6. The oilfield reservoir index curve construction method of claim 1, wherein in step five, the total hydrocarbon indication curve is: QTS ═ LOG10(QT) -LOG10(QTMIN))/(LOG10(QTMAX) -LOG10(QTMIN)), where QT is the total hydrocarbon curve, QTMAX is the maximum value of total hydrocarbons in a certain interval, and QTMIN is the minimum value of total hydrocarbons in a certain interval.
7. The method for constructing an index curve for an oilfield reservoir as defined in claim 1, wherein in step six, TTS is EXP (LOG (PORQ) (1+ PORF) LITHLOG (1+ QTS)/(LOG (VSH))2) And the pore is effective porosity, the pore is a rock debris logging indication curve, the LITHLOG is a rock debris logging indication curve, the QTS is an all-hydrocarbon indication curve, and the VSH is a shale content curve.
8. An oilfield reservoir index curve construction system, comprising:
the shale content curve construction module is used for acquiring a shallow lateral curve, a neutron logging curve and core shale content and constructing a shale indication curve through the shallow lateral curve and the neutron logging curve; constructing a shale content curve by using the shale indication curve and the shale content of the rock core;
the porosity curve construction module is used for acquiring a density curve, a neutron logging curve and a time difference curve to obtain total porosity; acquiring a mudstone time difference value, a skeleton time difference value and a fluid time difference value, and constructing a porosity curve through the total porosity, the mudstone time difference value, the skeleton time difference value and the fluid time difference value;
the fracture porosity indication curve construction module is used for acquiring a deep lateral curve, a shallow lateral curve, mud resistivity and a fracture index so as to construct a fracture porosity indication curve;
the formation cuttings logging indicating curve constructing module is used for acquiring a deep lateral curve, a shallow lateral curve, mud resistivity and a fracture index so as to construct a fracture porosity indicating curve;
the all-hydrocarbon indicating curve building module is used for obtaining an all-hydrocarbon curve of gas logging, and carrying out normalization processing to obtain an all-hydrocarbon indicating curve;
and the reservoir index curve construction module is used for integrating the shale content curve, the porosity curve, the fracture porosity indication curve, the rock debris logging indication curve and the total hydrocarbon indication curve to construct a reservoir index curve.
9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor when executing the computer program implements the steps of the oilfield reservoir index curve construction method of any one of claims 1 to 7.
10. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, carries out the steps of the oilfield reservoir index curve construction method according to any one of claims 1 to 7.
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