CN104297131A - Method for correcting porosity of gravelly sandstone reservoir - Google Patents
Method for correcting porosity of gravelly sandstone reservoir Download PDFInfo
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- CN104297131A CN104297131A CN201410612599.4A CN201410612599A CN104297131A CN 104297131 A CN104297131 A CN 104297131A CN 201410612599 A CN201410612599 A CN 201410612599A CN 104297131 A CN104297131 A CN 104297131A
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Abstract
The invention relates to the field of oil and natural gas prospecting and development and in particular relates to a method for correcting the porosity of a gravelly sandstone reservoir. According to the method, the porosity of the gravelly sandstone reservoir is subjected to coarse clastic particle content correction by taking 7 mm as the upper limit diameter of clastic particles capable of being normally drilled by a standard rock core column sample on the basis of macroscopic detail description of full diameter core of gravelly sandstone and corresponding porosity testing of the standard rock core column sample; the problem that the porosity measured by the standard rock core column sample with the diameter of 25 mm is larger than the actual porosity of the gravelly sandstone reservoir as no pores exist in undrilled coarse clastic particles but the volume of the rock sample is occupied can be solved, so that the porosity prediction precision of the gravelly sandstone reservoir is improved and the risk of oil-gas exploration is lowered.
Description
Technical field
The present invention relates to oil and gas exploration and development field, particularly a kind of gravel matter elements of sandstone porosity bearing calibration.
Background technology
Gravel matter sandstone refers to that diameter is greater than the petroclastic rock of detrital grain content between 25%-50% of 2mm.Gravel matter sandstone is as one of important Reservoir type of oil and gas, exploratory development in recent years achieves great breakthrough, as 936 well 3793m-3808m formation testing day produce oil 7.6 tons forever, salt 222 well 3985.8-4194.6m day produce oil 17.7 tons, becomes the key areas that oil gas " increasing the storage is produced " gradually.But gravel matter sandstone reservoir coarse size, sorting is poor, inner structure is complicated, cause its porosity prediction difficulty large, exploration risk is high.Therefore, the Obtaining Accurate of reservoir porosity becomes one of important research content in gravel matter sandstone oil-gas exploration and development.
Accurately will obtain the factor of porosity of gravel matter sandstone reservoir, just need carry out factor of porosity test to full-hole core, but full-hole core sample obtains difficulty, testing apparatus is rare, and testing cost is expensive, is unfavorable for carrying out large scale test.Therefore, from full-hole core, mainly drill through the standard core column sample that diameter is 25mm at present, adopt conventional orifices porosity method of testing to record standard core column sample factor of porosity, with the factor of porosity of this approximate gravel matter sandstone reservoir.In gravel matter sandstone reservoir, coarse-grained clastics content is high, when drilling through the standard core column sample of 25mm, in order to prevent coarse fragment breakage of particles from dropping, and the position that between general selection coarse-grained clastics, granularity is thinner.
Factor of porosity refers to that volume of porosity accounts for the percentage of rock cumulative volume, due to not by the coarse-grained clastics granule interior imporosity drilled through, but particle occupies rock sample volume, the factor of porosity causing the standard core column sample utilizing diameter to be 25mm to record is bigger than normal for the practical porosity of gravel matter sandstone reservoir, thus may bring the risk of erroneous judgement to oil-gas exploration and development.Along with improving constantly of Songliao basin, require more and more higher to the precision of prediction of reservoir porosity, the factor of porosity utilizing the factor of porosity of diameter 25mm standard core column sample between coarse fragment particle to be similar to gravel matter sandstone reservoir can not satisfy the demands, and needs the factor of porosity of a kind of simple and practical method of development to gravel matter sandstone reservoir to correct.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, be corrected to target with gravel matter elements of sandstone porosity, propose a kind of gravel matter sandstone full-hole core macroscopic view essence retouch analyze test with diameter 25mm standard core column sample factor of porosity between corresponding coarse fragment particle the gravel matter elements of sandstone porosity bearing calibration combined.
Technical scheme of the present invention is:
The standard core column sample factor of porosity Φ corresponding to gravel matter sandstone
post samplethe coarse fragment granule content carrying out being greater than 7mm corrects, and obtains the practical porosity Φ of gravel matter sandstone reservoir
full diameter.Concrete steps are as follows:
Step 1: utilize rock core body of casting image analysis system, the standard core column sample casting body flake corresponding to 126 pieces of gravel matter sample of sandstone carries out graphical analysis, obtain the Areal porosity S of each casting body flake, and carry out matching with the factor of porosity Φ of corresponding standard core column sample, set up the funtcional relationship between factor of porosity and Areal porosity:
Φ=2.5203S
0.8457 R
2=0.7374 （1）
Step 2: utilize Axio Vision Software Rel. image analysis software, in calculation procedure 1 essence tracing picture, diameter is greater than the accumulation area fraction S of the coarse fragment particle of 7mm
coarse fragment;
By geological magnifying glass, measurement statistics is carried out to the largest particles diameter contained in standard core column sample casting body flake, the largest particles diameter that can drill through in confirmed standard core column sample.
Step 3: utilize rock core body of casting image analysis system, obtains the casting body flake Areal porosity S that diameter 25mm standard core column sample is corresponding
post sample;
Step 4: the Areal porosity S calculating full-hole core
full diameter.Because the hole in gravel matter sandstone reservoir is mainly present in standard core column sample, so:
S
full diameter=(1-S
coarse fragment) × S
post sample(2)
Step 5: be similar to and think that the transforming relationship between Areal porosity with factor of porosity is consistent on casting body flake and full-hole core, utilizes formula (1) that full-hole core Areal porosity is transformed factor of porosity Φ
full diameter, that is:
Φ
full diameter=2.5203S
full diameter 0.8457(3)
Wherein, the method for the acquisition of casting body flake described in step 1, following steps:
(1) the coarse fragment particle of 2mm is greater than to diameter in gravel matter sandstone reservoir, by tracing paper, adopt the method for artificial sketch to carry out 1:1 essence to full-hole core to retouch, then utilize mapping software (as CorelDRAW X4 SP2 mapping software) to carry out fair drawing, obtain the coarse fragment particle image (Fig. 1) being greater than 2mm.
(2) for the above-mentioned full-hole core retouched through essence, choose the representative region that between coarse fragment particle, granularity is thinner, drill through the standard core column sample (Fig. 2) that diameter is 25mm.
(3) to drilled through diameter be the standard core column sample of 25mm, carry out the test of conventional orifices porosity, obtain the factor of porosity Φ of standard core column sample, and rock casting body flake is ground to standard core column sample.
The present invention carries out statistical study (Fig. 3) to the largest particles diameter in standard core column sample casting body flake corresponding to 126 pieces of gravel matter sample of sandstone, show that the largest particles diameter that can drill through in standard core column sample is to be less than 7mm, cumulative amount reaches 92.66%, detrital grain content in standard core column sample that diameter is greater than 7mm is extremely low, only occur at random, therefore think that 7mm is the upper limit diameter of the detrital grain that standard core column sample can normally drill through, and the standard value corrected using this higher limit as coarse fragment particle, in gravel matter elements of sandstone porosity corrects, the detrital grain being greater than 7mm is carried out to the correction of coarse fragment granule content.
The invention has the beneficial effects as follows:
The present invention retouches on the basis tested with corresponding standard core column sample factor of porosity in gravel matter sandstone full-hole core macroscopic view essence, using the upper limit diameter of the detrital grain that 7mm can normally drill through as standard core column sample, the correction of coarse fragment granule content is carried out to gravel matter elements of sandstone porosity, solve due to not by the coarse-grained clastics granule interior imporosity drilled through, but occupy rock sample volume, and the factor of porosity causing the standard core column sample utilizing diameter to be 25mm to record is for the practical porosity of gravel matter sandstone reservoir problem bigger than normal, thus improve gravel matter elements of sandstone porosity precision of prediction, contribute to the risk reducing oil-gas exploration.
Accompanying drawing explanation
Accompanying drawing 1 retouches schematic diagram for gravel matter sandstone full-hole core essence of the present invention;
Accompanying drawing 2 is that in gravel matter sandstone full-hole core of the present invention, diameter is that the standard core column sample of 25mm drills through schematic diagram;
Accompanying drawing 3 for diameter of the present invention be the largest particles diameter distribution profile that can drill through in 25mm standard core column sample;
Funtcional relationship between accompanying drawing 4 Areal porosity and factor of porosity;
Accompanying drawing 5 Shengli Oil Field X well gravel matter sandstone reservoir full-hole core essence tracing picture;
The casting body flake of accompanying drawing 6 Shengli Oil Field X well gravel matter sandstone reservoir full-hole core corresponding standard core column sample.
Embodiment
The specific embodiment of the present invention is as follows:
For the X well gravel matter sandstone reservoir in Shengli Oil Field somewhere, the concrete technical method that gravel matter elements of sandstone porosity corrects is described:
The first step: the coarse fragment particle of 2mm is greater than to diameter in gravel matter sandstone reservoir, by tracing paper, adopt the method for artificial sketch to carry out 1:1 essence to full-hole core to retouch, then utilize mapping software (as CorelDRAW X4 SP2 mapping software) to carry out fair drawing, obtain the coarse fragment particle image (Fig. 5) being greater than 2mm.
Second step: for the above-mentioned full-hole core retouched through essence, choose the representative region that between coarse fragment particle, granularity is thinner, drill through the standard core column sample that diameter is 25mm, recording factor of porosity is 10.70%, and grinds corresponding casting body flake (Fig. 6).
3rd step: utilize Axio Vision Software Rel. image analysis software, calculates diameter in first step essence tracing picture and is greater than the accumulation area fraction S of the coarse fragment particle of 7mm
coarse fragmentbe 25.3%.
4th step: utilize rock core body of casting image analysis system, obtains the casting body flake Areal porosity S that diameter 25mm standard core column sample is corresponding
post samplebe 5.93%.
5th step: the Areal porosity S calculating full-hole core
full diameter:
S
full diameter=(1-S
coarse fragment) × S
post sample=(1-0.253) × 5.93%=4.43%
6th step: utilize formula (1) that full-hole core Areal porosity is transformed factor of porosity Φ
full diameter, that is:
Φ
full diameter=2.5203S
full diameter 0.8457=2.5203 × 4.43
0.8457=8.87%.
Claims (2)
1. a gravel matter elements of sandstone porosity bearing calibration, is characterized in that, the standard core column sample factor of porosity Φ corresponding to gravel matter sandstone
post samplethe coarse fragment granule content carrying out being greater than 7mm standard value corrects, and obtains the practical porosity Φ of gravel matter sandstone reservoir
full diameter, concrete steps are as follows:
Step 1: utilize rock core body of casting image analysis system, the standard core column sample casting body flake corresponding to gravel matter sample of sandstone carries out graphical analysis, obtain the Areal porosity S of each casting body flake, and carry out matching with the factor of porosity Φ of corresponding standard core column sample, set up the funtcional relationship between factor of porosity and Areal porosity;
Φ=2.5203S
0.8457 R
2=0.7374 （1）
Step 2: utilize image analysis software, in calculation procedure 1, in essence tracing picture, diameter is greater than the accumulation area fraction S of the coarse fragment particle of described standard value
coarse fragment;
Step 3: utilize rock core body of casting image analysis system, obtains the casting body flake Areal porosity S that diameter 25mm standard core column sample is corresponding
post sample;
Step 4: the Areal porosity S calculating full-hole core
full diameter,
S
full diameter=(1-S
coarse fragment) × S
post sample(2)
Step 5: utilize formula (1) that full-hole core Areal porosity is transformed factor of porosity Φ
full diameter, that is:
Φ
full diameter=2.5203S
full diameter 0.8457(3).
2. gravel matter elements of sandstone porosity according to claim 1 bearing calibration, is characterized in that, the method for the acquisition of casting body flake described in step 1, following steps:
(1) the coarse fragment particle of 2mm is greater than to diameter in gravel matter sandstone reservoir, by tracing paper, adopts the method for artificial sketch to carry out 1:1 essence to full-hole core and retouch, then utilize mapping software to carry out fair drawing, obtain the coarse fragment particle essence tracing picture being greater than 2mm;
(2) for the full-hole core that (1) retouches through essence, choose the representative region that between coarse fragment particle, granularity is thinner, drill through the standard core column sample that diameter is 25mm;
(3) diameter drilled through (2) is the standard core column sample of 25mm, carries out the test of conventional orifices porosity, obtains the factor of porosity Φ of standard core column sample, and grinds rock casting body flake to standard core column sample.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467465A (en) * | 2015-10-26 | 2016-04-06 | 西南石油大学 | Method for utilizing porosity difference to calculate content of clay |
| CN105628580A (en) * | 2015-12-21 | 2016-06-01 | 中国石油大学(华东) | Reservoir false crack identification and physical property correction method |
| CN107525753A (en) * | 2017-07-25 | 2017-12-29 | 中国石油大学(北京) | Determine the method and device of hole tortuosity |
| CN108844879A (en) * | 2018-06-08 | 2018-11-20 | 中国石油天然气股份有限公司 | Reservoir based on laser intensity is appeared porosity prediction method and device |
| CN114624163A (en) * | 2022-04-18 | 2022-06-14 | 成都理工大学 | Overburden pressure pore-permeability test-based muddiness zeolite clastic rock reservoir physical property correction method |
| CN115876668A (en) * | 2023-02-22 | 2023-03-31 | 广东石油化工学院 | Petroleum reservoir porosity measuring and calculating method based on core |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105467465A (en) * | 2015-10-26 | 2016-04-06 | 西南石油大学 | Method for utilizing porosity difference to calculate content of clay |
| CN105628580A (en) * | 2015-12-21 | 2016-06-01 | 中国石油大学(华东) | Reservoir false crack identification and physical property correction method |
| CN105628580B (en) * | 2015-12-21 | 2018-04-13 | 中国石油大学(华东) | Reservoir baste identifies and physical property bearing calibration |
| CN107525753A (en) * | 2017-07-25 | 2017-12-29 | 中国石油大学(北京) | Determine the method and device of hole tortuosity |
| CN108844879A (en) * | 2018-06-08 | 2018-11-20 | 中国石油天然气股份有限公司 | Reservoir based on laser intensity is appeared porosity prediction method and device |
| CN108844879B (en) * | 2018-06-08 | 2021-01-29 | 中国石油天然气股份有限公司 | Reservoir outcrop porosity prediction method and device based on laser intensity |
| CN114624163A (en) * | 2022-04-18 | 2022-06-14 | 成都理工大学 | Overburden pressure pore-permeability test-based muddiness zeolite clastic rock reservoir physical property correction method |
| CN114624163B (en) * | 2022-04-18 | 2023-05-05 | 成都理工大学 | Reservoir physical property correction method for turbidimetric zeolite clastic rock based on overburden pore permeability test |
| CN115876668A (en) * | 2023-02-22 | 2023-03-31 | 广东石油化工学院 | Petroleum reservoir porosity measuring and calculating method based on core |
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| CN104297131B (en) | 2016-09-21 |
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