CN107676082B - Method for correcting oil saturation of rock core by using logging synthetic curve - Google Patents
Method for correcting oil saturation of rock core by using logging synthetic curve Download PDFInfo
- Publication number
- CN107676082B CN107676082B CN201610625723.XA CN201610625723A CN107676082B CN 107676082 B CN107676082 B CN 107676082B CN 201610625723 A CN201610625723 A CN 201610625723A CN 107676082 B CN107676082 B CN 107676082B
- Authority
- CN
- China
- Prior art keywords
- oil saturation
- logging
- curve
- rock core
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000011435 rock Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000013519 translation Methods 0.000 claims abstract description 3
- 238000012937 correction Methods 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000003786 synthesis reaction Methods 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000004901 spalling Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention provides a method for correcting oil saturation of a rock core by using a logging synthetic curve, which comprises the following steps: compiling a So-depth map according to the initially corrected oil saturation data So of the rock core; obtaining a logging synthetic curve Sy according to a fitting formula of the oil saturation of the work area, and carrying out scaling translation on the logging synthetic curve Sy in an equal proportion to obtain a new logging curve Sy'; horizontally projecting the oil saturation data So of the rock core to the new logging curve Sy 'to obtain new oil saturation data So'; and taking the average value So ' ' of the data points So before projection and the data points So ' after projection as the final core oil saturation corrected to relative size. The method for correcting the oil saturation of the rock core by using the logging synthetic curve adopts the data of the underground undisturbed stratum to correct the experimental data of the rock core which is mined to the surface of the earth, so that the real conditions of the underground undisturbed rock core and the underground undisturbed stratum are as faithful as possible, the method is easy to understand and simple and convenient, and a feasible method is provided for correcting and perfecting the relative size of the oil saturation of the rock core.
Description
Technical Field
The invention relates to the technical field of oilfield development, in particular to a method for correcting oil saturation of a rock core by using a logging synthetic curve.
Background
At present, the factors for generating the oil saturation error of the rock core are complex, and various corresponding correction methods are not suitable:
1. the method is characterized in that after the core is taken out, the core is generally stored for more than half a year, the experiment is started, a plurality of ring joints cause remarkable saturation change, and the influence factors are complex, ① dissolved gas drives liquid to be discharged outwards and contributes 5-30% to a saturation error, ② drilling fluid invades, even if a 1m mudstone cap exists, the core sealing rate is possibly unqualified and the error contributes 0-20%, oil and water are all volatilized due to high temperature generated by ③ core cutting and contribute 0-30% to a total error, ④ core chamber is volatilized after being placed for a long time and contributes 5-20% to the error, ⑤ taking out the earth surface covering pressure is reduced, the core pore expansion causes 5-20% to the saturation error, ⑥ is placed in an ultra-low temperature storage box at-80 ℃ for a long time, the water expansion causes core pore spalling after freezing or the whole core spalling and contributes 5-20% to the saturation error, and the artificial error and the system error in the ⑦ experiment.
2. Although the generation factor of the oil saturation error is complex, the logging curve is more accurate to the relatively high and low reaction of the oil saturation from the logging curve reflecting the oil content;
3. the logging curve reflects the original condition of the rock core under the ground, is not influenced by various rock core error factors, corrects the surface rock core data by the underground data, and is logically reasonable. Although the log calculation of the resulting oil saturation value is not accurate enough, some work can be done with its relative high or low.
In order to accurately correct the oil saturation of the rock core, a new method needs to be established. Therefore, a novel method for correcting the oil saturation of the rock core by using a logging synthetic curve is invented, and the technical problems are solved.
Disclosure of Invention
The invention aims to provide a method for correcting the oil saturation of a rock core by using a logging synthetic curve.
The object of the invention can be achieved by the following technical measures: the method for correcting the oil saturation of the rock core by using the logging synthetic curve comprises the following steps: step 1, compiling a So-depth map according to the initially corrected oil saturation data So of the rock core; step 2, obtaining a logging synthetic curve Sy according to a fitting formula of the oil saturation of the work area, and carrying out scaling translation on the logging synthetic curve Sy in an equal proportion to obtain a new logging curve Sy'; step 3, horizontally projecting the oil saturation data So of the rock core to the new logging curve Sy 'to obtain new oil saturation data So'; and step 4, taking the average value So 'of the data points So before projection and the data points So' after projection as the oil saturation of the core with the finally corrected relative size.
The object of the invention can also be achieved by the following technical measures:
in step 1, correcting the oil saturation data So of the rock core by adopting a weighted average correction method.
In step 2, the porosity of a work area is determined
Fitting formula of oil saturation
Obtaining two logging curves of acoustic time difference AC and induction conductivity COND, wherein a newly synthesized logging curve Sy:
Sy＝100-100*100.54952*log(0.005512AC–0.283)-0.63547*log(1000/cond)+0.5116。
in step 2, the well-logging synthetic curve Sy is scaled and translated in equal proportion, So that the well-logging synthetic curve Sy is matched with the So-depth map in step 1 as much as possible, and a new well-logging curve Sy' is obtained.
In step 3, horizontally projecting the core oil saturation data So to the new logging curve Sy 'with unchanged depth to obtain new oil saturation data So'.
The method for correcting the oil saturation of the rock core by using the logging synthetic curve has the advantages of clear technical thought and simple application, establishes a method for correcting the relative size of the oil saturation of the rock core, has better operability, innovativeness and practicability, is beneficial to popularization, and provides a feasible method for correcting the oil saturation of the rock core.
Drawings
FIG. 1 is a flow chart of one embodiment of a method of correcting core oil saturation with a log synthesis curve according to the present invention;
FIG. 2 is a schematic flow chart of a method for correcting core oil saturation with a log synthetic curve according to an embodiment of the invention.
Detailed Description
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Referring to fig. 1 and 2, fig. 1 and 2 are a flow chart and a flow diagram of a method for correcting the oil saturation of a core by using a logging synthetic curve according to the present invention.
In step 101, correcting the oil saturation data So of the rock core by using a weighted average correction method, and compiling into a So-depth map. The flow proceeds to step 102.
102, according to the porosity of a work area
Fitting formula of oil saturation
Obtaining two logging curves of acoustic time difference AC and induction resistivity COND, wherein the newly synthesized logging curve Sy:
Sy＝100-100*100.54952*log(0.005512AC–0.283)-0.63547*log(1000/cond)+0.5116
and (5) scaling and translating Sy to make Sy and the So-depth map of the step 1 coincide as much as possible to obtain a new logging curve Sy'. The flow proceeds to step 103.
And 103, horizontally projecting the oil saturation data of the rock core to a logging curve Sy 'with unchanged depth to obtain new oil saturation data So'. The flow proceeds to step 104.
And step 104, taking the average value So 'of the data points So before projection and the data points So' after projection as the oil saturation of the core with the final corrected relative size. The flow ends.
The method for correcting the oil saturation of the rock core by using the logging synthetic curve can realize that the relative size of the logging curve Sy influences the correction of the oil saturation of the rock core. The relative size of the oil saturation of the rock core is corrected by using the logging curve, so that the corrected oil saturation can reflect the real underground situation more, the relative value of the saturation is more accurate, the accuracy of correcting the oil saturation error of the rock core is improved, and an effective method is provided for restoring the real underground rock core situation.
Claims (3)
1. The method for correcting the oil saturation of the rock core by using the logging synthetic curve is characterized by comprising the following steps of:
step 1, compiling a So-depth map according to the initially corrected oil saturation data So of the rock core;
step 2, obtaining a logging synthetic curve Sy according to a fitting formula of the oil saturation of the work area, and carrying out scaling translation on the logging synthetic curve Sy in an equal proportion to obtain a new logging curve Sy';
step 3, horizontally projecting the oil saturation data So of the rock core to the new logging curve Sy 'to obtain new oil saturation data So';
step 4, taking the average value So 'of the data points So before projection and the data points So' after projection as the oil saturation of the rock core with the finally corrected relative size;
in step 2, fitting formula according to porosity phi and oil saturation of a certain work area
φ＝0.5512AC–28.3，
So＝100-100*100.54952*log(φ/100)-0.63547*log(1000/cond)+0.5116，
Obtaining two logging curves of acoustic time difference AC and induction conductivity COND, wherein a newly synthesized logging curve Sy:
Sy＝100-100*100.54952*log(0.005512AC–0.283)-0.63547*log(1000/cond)+0.5116；
in step 2, the well-logging synthetic curve Sy is scaled and translated in equal proportion, So that the well-logging synthetic curve Sy is matched with the So-depth map in step 1 as much as possible, and a new well-logging curve Sy' is obtained.
2. The method for correcting the oil saturation of the core by using the logging synthesis curve as claimed in claim 1, wherein in the step 1, the weighted average correction method is adopted to correct the oil saturation data So of the core.
3. The method for correcting the oil saturation of the core by using the logging synthetic curve as claimed in claim 1, wherein in the step 3, the oil saturation data So of the core is horizontally projected to the new logging curve Sy 'with the depth unchanged to obtain new oil saturation data So'.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610625723.XA CN107676082B (en) | 2016-08-01 | 2016-08-01 | Method for correcting oil saturation of rock core by using logging synthetic curve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610625723.XA CN107676082B (en) | 2016-08-01 | 2016-08-01 | Method for correcting oil saturation of rock core by using logging synthetic curve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107676082A CN107676082A (en) | 2018-02-09 |
| CN107676082B true CN107676082B (en) | 2020-07-14 |
Family
ID=61134065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610625723.XA Active CN107676082B (en) | 2016-08-01 | 2016-08-01 | Method for correcting oil saturation of rock core by using logging synthetic curve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107676082B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109162696B (en) * | 2018-10-08 | 2022-06-03 | 陕西延长石油(集团)有限责任公司研究院 | Method for calculating stratum oil saturation by using compensation sound wave |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998322A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气股份有限公司 | Constant gradient field nuclear magnetic resonance rock sample analysis method and instrument |
| RU2486334C1 (en) * | 2011-12-12 | 2013-06-27 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Method of high-viscosity oil development |
| CN103558109A (en) * | 2013-10-28 | 2014-02-05 | 东北石油大学 | Method for testing resistance-oil saturation standard relation curve |
| CN104806231A (en) * | 2014-01-27 | 2015-07-29 | 中国石油化工股份有限公司 | Quantitative evaluation method of heavy oil steam stimulation water flooded layer |
| CN105298485A (en) * | 2015-11-13 | 2016-02-03 | 西南石油大学 | Comprehensive evaluation method for single well oil gas geology |
-
2016
- 2016-08-01 CN CN201610625723.XA patent/CN107676082B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998322A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气股份有限公司 | Constant gradient field nuclear magnetic resonance rock sample analysis method and instrument |
| RU2486334C1 (en) * | 2011-12-12 | 2013-06-27 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Method of high-viscosity oil development |
| CN103558109A (en) * | 2013-10-28 | 2014-02-05 | 东北石油大学 | Method for testing resistance-oil saturation standard relation curve |
| CN104806231A (en) * | 2014-01-27 | 2015-07-29 | 中国石油化工股份有限公司 | Quantitative evaluation method of heavy oil steam stimulation water flooded layer |
| CN105298485A (en) * | 2015-11-13 | 2016-02-03 | 西南石油大学 | Comprehensive evaluation method for single well oil gas geology |
Non-Patent Citations (2)
| Title |
|---|
| Characteristics and Evaluation of Extremely Shallow Oil Sand in Heavy Oil Reservoirs;Wu Zhaohui et al;《Petroleum Science and Technology》;20150814;第33卷(第11期);第1215-1221页 * |
| 岩心油水饱和度误差形成主要原因即投影校正法;吴兆徽等;《当代化工》;20151228;第44卷(第12期);第2866-2869页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107676082A (en) | 2018-02-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Shaibu et al. | An assessment of methane gas production from natural gas hydrates: Challenges, technology and market outlook | |
| CN106484933B (en) | It is a kind of for determining the method and system of shale gas well well control dynamic holdup | |
| Lee et al. | Methane hydrates potential as a future energy source | |
| CN206146927U (en) | Decomposition of simulation gas hydrate causes submarine landslide experimental apparatus | |
| AU2015229274B2 (en) | Efficient and robust compositional reservoir simulation using a fast phase envelope | |
| CN107861158A (en) | It is a kind of to determine gas hydrates BSR interfaces and the research method of seabed intersection location | |
| RU2016107477A (en) | METHOD AND ANALYSIS OF THE INTEGRAL DESIGN OF A CASING COLUMN FOR PLANNING AND REAL TIME | |
| CN107676082B (en) | Method for correcting oil saturation of rock core by using logging synthetic curve | |
| Li et al. | Screening and simulation of offshore CO2-EOR and storage: A case study for the HZ21-1 oilfield in the Pearl River Mouth Basin, Northern South China Sea | |
| CN104406980A (en) | Visualization testing device and method for carbon dioxide (CO2)-water phase state in porous medium | |
| CN108729912B (en) | Yield splitting method suitable for numerical reservoir simulation | |
| Moradi et al. | Geomechanical study of well stability in high-pressure, high-temperature conditions | |
| GB2568201A (en) | Tandem releasable bridge plug system and method for setting such tandem releasable bridge plugs | |
| MX2020001596A (en) | Floating offshore carbon neutral electric power generating system using oceanic carbon cycle. | |
| Durucan et al. | In Salah CO2 storage JIP: carbon dioxide plume extension around KB-502 well–new insights into reservoir behaviour at the In Salah storage site | |
| CN109543164B (en) | Method for generating drilling histogram by combining Autocad with Excel | |
| Shin et al. | Estimation of porosity and saturation in gas hydrate bearing sediments using well logs and core analysis data of the 2nd wells in Ulleung Basin, East Sea | |
| Jensen | Assessing the Potential for CO2 EOR and CO2 Storage in Depleted Oil Pools in Southeastern Saskatchewan, Canada | |
| CN206489002U (en) | The experimental provision that a kind of simulated pressure influences on natural gas hydrate stratum crack | |
| CN104153764A (en) | Method for determining shape of shaft in gas drilling open hole section | |
| CN113658335A (en) | Method for creating complex geological model of karst development area | |
| Pruess | Modeling CO2 leakage scenarios, including transitions between super-and sub-critical conditions, and phase change between liquid and gaseous CO2 | |
| Abili et al. | Reassessment of Multiphase Pump on Field-Case Studies for Marginal-Deepwater-Field Devolopments | |
| CN107387039A (en) | Utilize the method for the continuous pressure measurement data inversion carbon dioxide flooding leading edge of multiple spot | |
| Han et al. | Velocity and density of water with dissolved CH4 and CO2 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |