CN103711482B - A kind of method quickly identifying clastic reservoir rock based on two kinds of log overlay chart - Google Patents
A kind of method quickly identifying clastic reservoir rock based on two kinds of log overlay chart Download PDFInfo
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Abstract
A kind of method quickly identifying clastic reservoir rock based on two kinds of log overlay chart, comprises the following steps: first, first against Clastic Stratum of Country Rocks, in the borehole by using logger to obtain the interval transit time parameter of Clastic Stratum of Country Rocks, natural potential parameter；Second, by using the rock core acquired by special sampler or sieve residue log data in reference boring, determine that relatively thick mud stone grows section and possible fine and close interval, and unified with nature potential logging curve determines shale line；3rd, according to log overlay method principle, natural potential, interval transit time curve are carried out reverse overlap, it is desirable at shale line position and fine and close interval, two kinds of logs essentially coincide；4th, in natural potential, two kinds of log overlay chart of interval transit time, according to the overlap between two curves and separation relation, the position separated at two kinds of curves determines the amplitude difference between two curves, and according to amplitude extent between curve, judge reservoir reservoir physical relatively quality, have simple and convenient, accuracy of identification is high and fireballing feature.
Description
Technical field
The invention belongs to Geophysical Logging field, be specifically related to a kind of method quickly identifying clastic reservoir rock based on two kinds of log overlay chart.
Background technology
Along with improving constantly of exploration and development degree, the geologic objective complexity and the well log interpretation difficulty that are faced are the most increasing, as complex lithology body sandstone, the dual-pore medium reservoirs of Complicated Pore Structures reservoir constantly occur, cause in the past as identifying lithology and evaluating Main Basis and the log interpretation technology of reservoir, it is increasingly difficult to meet the needs of exploration-development integration under complex geological condition, exists during well log interpretation and reservoir is misread the phenomenon being interpreted as non-reservoir class.But there is presently no for complex lithology and accumulation property Fast Evaluation thereof, select lithology, the log parameter of physical property response more sensitivity and curvilinear characteristic thereof respectively, and then set up the interpretation model that geologic logging parametric joint retrains, to improve the precision of reservoir grading.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of method quickly identifying clastic reservoir rock based on two kinds of log overlay chart, i.e. quickly identify clastic reservoir rock based on natural potential and interval transit time curve overlay chart, the method have simple and convenient, accuracy of identification is high and fireballing feature.
For achieving the above object, the technical solution used in the present invention is: a kind of method quickly identifying clastic reservoir rock based on two kinds of log overlay chart, comprises the following steps:
First, first against Clastic Stratum of Country Rocks, in the borehole by using logger to obtain the interval transit time parameter of Clastic Stratum of Country Rocks, natural potential parameter；
Second, by using the rock core acquired by special sampler or sieve residue log data in reference boring, determine that relatively thick mud stone grows section and possible fine and close interval, and unified with nature potential logging curve determines shale line；
3rd, according to log overlay method principle, natural potential, interval transit time curve are carried out reverse overlap, it is desirable at shale line position and fine and close interval, two kinds of logs essentially coincide；
4th, in natural potential, two kinds of log overlay chart of interval transit time, according to the overlap between two curves and separation relation, the position separated at two kinds of curves determines the amplitude difference between two curves, and according to amplitude extent between curve, judge the quality relatively of reservoir reservoir physical, general amplitude difference is big, and storage and collection performance is relatively good, otherwise, amplitude difference is little, and storage and collection performance is poor.
Advantages of the present invention is:
Compared with prior art, the present invention processes based on natural potential and acoustic travel time logging curves overlapped figure and quickly identifies clastic reservoir rock, considers pore characteristic and the filtration properties of clastic reservoir rock simultaneously, also includes advantages below:
(1) the preferred of the sensitiveest parameter of the porosity to reservoir itself, Permeability Parameters log response is paid attention to；
(2) utilize mud stone, compacted zone to carry out constraint curve overlay chart, directly in response to reservoir porosity, permeability and change thereof, improve the precision of log overlay chart reflection reservoir storage and collection performance.
In a word, the present invention has developed the efficiency of clastic reservoir rock logging evaluation.
Accompanying drawing explanation
Fig. 1 is that the nutural potential logging curve of the embodiment of the present invention 1 determines shale line figure, and utilizes natural potential, the figure of acoustic travel time logging curves overlapped figure feature identification clastic reservoir rock.
Fig. 2 is that the nutural potential logging curve of the embodiment of the present invention 2 determines shale line figure, and utilizes natural potential, the figure of acoustic travel time logging curves overlapped figure feature identification clastic reservoir rock.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1:
Extend as a example by group leader 10 oil reservoir group (Fig. 1) by the X well in Middle of Ordos Basin one oil district:
A kind of method quickly identifying clastic reservoir rock based on two kinds of log overlay chart, comprises the following steps:
First, first against Clastic Stratum of Country Rocks, in the borehole by using logger to obtain the interval transit time parameter of Clastic Stratum of Country Rocks, natural potential parameter；
Second, by using the rock core acquired by special sampler or sieve residue log data in reference boring, determine that relatively thick mud stone grows section and possible fine and close interval, and unified with nature potential logging curve determines shale line；In Fig. 1, mainly according to 2059.3 ~ 2064.5m well section thicker mud stone position, determine that black straight dashed line in figure is seen in shale line position, determine curve co-insides position according to 2078.3 ~ 2080.0m densification interval；
3rd, according to log overlay method principle, natural potential, interval transit time curve are carried out reverse overlap, it is desirable at shale line position and fine and close interval, two kinds of logs essentially coincide；In mud stone section 2059.3 ~ 2064.5m well section, compacted zone 2078.3 ~ 2080.0m well section, natural potential, interval transit time curve essentially coincide；
4th, in natural potential, two kinds of log overlay chart of interval transit time, according to the overlap between two curves and separation relation, the position separated at two kinds of curves determines the amplitude difference between two curves, and according to amplitude extent between curve, judge the quality relatively of reservoir reservoir physical, according to the amplitude difference between two kinds of curves, relative analysis rock core physical property porosity, permeability analysis result understand, amplitude difference between general two curves is big, storage and collection performance is relatively good, and between curve, amplitude difference is little, and storage and collection performance is poor.
Embodiment 2:
Extend as a example by group leader 9 oil reservoir group (Fig. 2) by the X well in Middle of Ordos Basin one oil district:
A kind of method quickly identifying clastic reservoir rock based on two kinds of log overlay chart, comprises the following steps:
First, first against Clastic Stratum of Country Rocks, in the borehole by using logger to obtain the interval transit time parameter of Clastic Stratum of Country Rocks, natural potential parameter；
Second, by using the rock core acquired by special sampler or sieve residue log data in reference boring, determine that relatively thick mud stone grows section and possible fine and close interval, and unified with nature potential logging curve determines shale line；In Fig. 2, mainly according to 1825.3 ~ 1834.3m well section thicker mud stone position, determine that black straight dashed line in figure is seen in shale line position, determine curve co-insides position according to 1823.0 ~ 1825.3m, 1819.9 ~ 1823.4m densification interval；
3rd, according to log overlay method principle, natural potential, interval transit time curve are carried out reverse overlap, it is desirable at shale line position and fine and close interval, two kinds of logs essentially coincide；In mud stone section 1825.3 ~ 1834.3m well section, fine and close interval 1823.0 ~ 1825.3m, 1819.9 ~ 1823.4m well section, natural potential, interval transit time curve essentially coincide；
4th, in natural potential, two kinds of log overlay chart of interval transit time, according to the overlap between two curves and separation relation, the position separated at two kinds of curves determines the amplitude difference between two curves, and according to amplitude extent between curve, judge the quality relatively of reservoir reservoir physical, according to the amplitude difference between two kinds of curves, relative analysis rock core physical property porosity, permeability analysis result understand, amplitude difference between general two curves is big, storage and collection performance is relatively good, and between curve, amplitude difference is little, and storage and collection performance is poor.
The principle of the present invention:
In view of logging signal is the concentrated expression of formation lithology, physical property, aqueous, oiliness, so for lithology, physical property, pore structure, formation water system complex changeable oil district, can finely reflect that the log parameter of complicated reservoirs lithology, physical property and oiliness feature thereof is the most complicated and changeable, and in log response parameter, lithology and physical property characteristic explanation thereof are the bases that well logging oiliness is explained.Therefore, for clastic reservoir rock, based on the concept of reservoir in reservoir geology, more focus on pore character and the filtration properties thereof of rock, so, this is accomplished by both focusing on individual event logging signal and focuses on multiple information synthesis analysis of logging well again, is quickly reflected its porosity, permeability.So, based on natural potential, acoustic travel time logging principle, establish the method quickly identifying reservoir according to natural potential, acoustic travel time logging curves overlapped figure feature.The essence of the method is: for clastic reservoir rock, on the premise of getting rid of drilling fluid, depth of stratum impact, the size of the abnormal amplitudes that spontaneous potential curve deflects relative to its shale line and rock stratum filtration properties are positive relationship, the filtration properties of general rock stratum is the best, the abnormal amplitudes of its spontaneous potential curve is the biggest, spontaneous potential curve abnormal amplitudes reflection permeability；Simultaneously for clastic reservoir rock, the size of interval transit time curve numerical value, with formation porosity, there is fine positive correlation, the height of acoustic travel time logging numerical value, the porosity of reflection reservoir；Therefore, utilize above-mentioned natural potential, two kinds of curves of interval transit time, according to log overlay chart principle, two kinds of curves are carried out reverse overlap, require at mud stone position and obvious compacted zone position, together with two kinds of logs of natural potential and interval transit time are substantially overlapping, namely near the shale line of nutural potential logging curve, make two kinds of logs substantially overlapping, so at reservoir position, owing to having certain porosity and permeability, spontaneous potential curve is caused to there is obvious negative anomaly, interval transit time curve relatively mud stone position reduces and relatively compacted zone position increases, amplitude difference is there is between two curves, if physical property is the best, amplitude difference between two curves is the biggest.The method is mainly based upon reservoir concept, from natural potential, the principle of acoustic travel time logging, utilizes the principle of log overlay method simultaneously, two kinds of curves is carried out reverse overlap processing and the most directly reflects reservoir pore space and filtration properties.
Claims (1)
1. the method quickly identifying clastic reservoir rock based on two kinds of log overlay chart, it is characterised in that comprise the following steps:
First, first against Clastic Stratum of Country Rocks, in the borehole by using logger to obtain the interval transit time parameter of Clastic Stratum of Country Rocks, natural potential parameter；
Second, by using the rock core acquired by special sampler or sieve residue log data in reference boring, determine that relatively thick mud stone grows section and possible fine and close interval, and unified with nature potential logging curve determines shale line；
3rd, according to log overlay method principle, natural potential, interval transit time curve are carried out reverse overlap, it is desirable at shale line position and fine and close interval, two kinds of logs essentially coincide；
4th, in natural potential, two kinds of log overlay chart of interval transit time, according to the overlap between two curves and separation relation, the position separated at two kinds of curves determines the amplitude difference between two curves, and according to amplitude extent between curve, judge the quality relatively of reservoir reservoir physical, general amplitude difference is big, and storage and collection performance is relatively good, otherwise, amplitude difference is little, and storage and collection performance is poor.
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| CN103993871B (en) * | 2014-05-08 | 2017-02-15 | 中国石油化工股份有限公司 | Method and device for processing well logging information of thin interbed stratums in standardization mode |
| CN105525917B (en) * | 2014-09-28 | 2019-03-29 | 中国石油化工股份有限公司 | The method for identifying fluid type in the method and identification reservoir of reservoir |
| CN104678455A (en) * | 2014-12-12 | 2015-06-03 | 中国石油化工股份有限公司 | Terrestrial fracture-cavern reservoir identification method |
| CN105988137B (en) * | 2015-02-11 | 2018-01-09 | 中国石油化工股份有限公司 | Logging character curve Reconstruction method of the sand-conglomerate body based on Core-Calibrated Logging |
| CN105064986A (en) * | 2015-07-24 | 2015-11-18 | 中国石油天然气集团公司 | Method for building reservoir four-property relationship spectrum by using conventional well detection and logging information |
| CN105089662B (en) * | 2015-07-24 | 2018-04-06 | 中国石油天然气股份有限公司 | The bearing calibration of carbonate formation well logging composite columnar section and system |
| CN107065011B (en) * | 2017-06-22 | 2018-11-02 | 东北石油大学 | A kind of curve frequencies fusion method applied to continental basins reservoir inversion |
| CN110320572B (en) * | 2018-03-29 | 2021-04-23 | 中国石油化工股份有限公司 | Method and system for identifying sedimentary facies |
| CN110320573B (en) * | 2018-03-29 | 2021-05-25 | 中国石油化工股份有限公司 | Logging parameter construction method and system reflecting reservoir productivity |
| CN111487691B (en) * | 2020-01-19 | 2022-06-24 | 西北大学 | Method for quantitatively identifying lithology and sand body structure of tight sandstone reservoir |
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