CN1258088C - Method for identifying real and false oil/gas display using drilling well liquid pyrolyzation-gas phase chromatography logging well - Google Patents
Method for identifying real and false oil/gas display using drilling well liquid pyrolyzation-gas phase chromatography logging well Download PDFInfo
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- CN1258088C CN1258088C CN 200410077933 CN200410077933A CN1258088C CN 1258088 C CN1258088 C CN 1258088C CN 200410077933 CN200410077933 CN 200410077933 CN 200410077933 A CN200410077933 A CN 200410077933A CN 1258088 C CN1258088 C CN 1258088C
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- 238000005553 drilling Methods 0.000 title claims abstract description 52
- 238000004587 chromatography analysis Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 title 1
- 239000012530 fluid Substances 0.000 claims abstract description 51
- 239000003921 oil Substances 0.000 claims abstract description 27
- 239000011435 rock Substances 0.000 claims abstract description 23
- 239000010779 crude oil Substances 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- XOJVVFBFDXDTEG-UHFFFAOYSA-N pristane Chemical compound CC(C)CCCC(C)CCCC(C)CCCC(C)C XOJVVFBFDXDTEG-UHFFFAOYSA-N 0.000 claims description 18
- 150000002430 hydrocarbons Chemical class 0.000 claims description 15
- GGYKPYDKXLHNTI-UHFFFAOYSA-N 2,6,10,14-tetramethylhexadecane Chemical compound CCC(C)CCCC(C)CCCC(C)CCCC(C)C GGYKPYDKXLHNTI-UHFFFAOYSA-N 0.000 claims description 12
- 239000005416 organic matter Substances 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 239000000654 additive Substances 0.000 claims description 8
- 230000000996 additive effect Effects 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- 238000011109 contamination Methods 0.000 claims description 4
- 238000000045 pyrolysis gas chromatography Methods 0.000 abstract description 5
- 238000013459 approach Methods 0.000 abstract description 3
- 239000012634 fragment Substances 0.000 abstract 7
- 239000007789 gas Substances 0.000 description 33
- 239000002283 diesel fuel Substances 0.000 description 23
- 229930195733 hydrocarbon Natural products 0.000 description 9
- 239000004215 Carbon black (E152) Substances 0.000 description 5
- 239000000314 lubricant Substances 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 2
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 description 2
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000004817 gas chromatography Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000002902 bimodal effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010773 plant oil Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The present invention discloses a method for identifying true and false indication of oil and gas. Drilling fluid is respectively drilled to different well segments, pyrolysis-gas chromatographic analysis is carried out, obviously changed well segment regions are determined, and pyrolysis-gas chromatographic analysis data is judged by combining different treated agents in the drilling fluid, the pyrolysis-gas chromatographic analysis data of area crude oil and the storage rock fragments of different well segments. When the atmogeochemistry characteristics of the storage rock fragments approach to the atmogeochemistry characteristics of the area crude oil, the indication of oil and gas is analyzed and reflected by the storage rock fragments through judgment. When the atmogeochemistry characteristics of the storage rock fragments approach to the atmogeochemistry characteristics of the drilled drilling fluid, the storage rock fragments are polluted by the drilling fluid, the indication of oil and gas analyzed and reflected by the rock fragments is false. Through using a pyrolysis-gas chromatography atmogeochemistry logging technique of the drilling fluid, the present invention can effectively identify the true and false indication of oil and gas and pollution, and the main pollution conditions of the rock fragments caused by the drilling fluid treated agent in the well segments are determined.
Description
Technical field
The invention belongs to oil and gas well drilling engineering field, relate to the reservoir rock oil-gas possibility is discerned, particularly by drilling fluid being carried out pyrolysis-gas chromatography well logging to discern the method for true and false show of oil and gas.
Background technology
Drilling fluid is the blood of oil and gas well drilling engineering and the carrier of cutting carring, wash away at drilling fluid, resident fluid such as cutting carring returns in the surface process, material under actings in conjunction such as stratum and wellbore pressure, temperature in landwaste and the drilling fluid adsorbs exchange mutually, be a dynamic process, as shown in Figure 1.
When the content of organic matter is high in the drilling fluid, can pollute landwaste, and organic matter also can be carried absorption by drilling fluid in the landwaste, therefore, the mensuration of organic equal size and variation characteristic in the drilling fluid are geological syntheses well logging identification resident fluid and evaluating reservoir and show of oil and gas standard feature.Conventional technique of geochemical logging such as rock pyrolysis, landwaste head space gas lighter hydrocarbons etc., be detected object mainly then with organic matter in landwaste and the rock core, judge the reservoir rock oil-gas possibility by organic absolute content and variation characteristic in the mensuration landwaste, often ignore detection to drilling fluid, thereby there is not record to the height of the content of organic matter in the drilling fluid and to the influence of landwaste geochemical logging data, especially when deep-well and chance bad ground, often use oil base drilling fluid or add diesel oil, lubricant, the treating agent that the multiple content of organic matter such as releasing stuck agent is high guarantees normally to creep into, drilling fluid can pollute landwaste and form false show of oil and gas, and conventional technique of geochemical logging can't effectively be discerned this.
The innovation and creation content
The method that the purpose of this invention is to provide a kind of science judgment and the true and false show of oil and gas of identification.
The method that the present invention discerns true and false show of oil and gas may further comprise the steps:
Step 1: respectively pyrolysis-gas chromatographic analysis is carried out in different disposal agent in the drilling fluid and regional crude oil, obtained detailed hydrocarbon compound relative content numerical value, geochemical index and chromatogram in the organic matter wherein;
Step 2: respectively different well sections are crept into drilling fluid and carry out pyrolysis-gas chromatographic analysis, obtain detailed hydrocarbon compound relative content numerical value, geochemical index and chromatogram in the organic matter wherein, and determine the well section interval of significant change according to its geochemical index and chromatogram feature;
Step 3: different well section storage rock landwaste are carried out pyrolysis-gas chromatographic analysis, obtain detailed hydrocarbon compound relative content numerical value, geochemical index and chromatogram in the organic matter wherein, and determine the well section interval of significant change according to its geochemical index and chromatogram feature;
Step 4: contrast step 1, step 2 and step 3, when storing up the approaching of rock landwaste geo-chemical feature and regional crude oil, what then judge the reflection of storage rock cuttings analysis is show of oil and gas; When storing up rock landwaste geo-chemical feature and creeping into the approaching of drilling fluid, storage rock landwaste is described by drilling fluid contamination, by the cuttings analysis reflection is false show of oil and gas.
In the method for the true and false show of oil and gas of above-mentioned identification, further comprising the discriminating step to described pollution, specifically is with the geochemical index of step 3 and comparing of chromatogram and single additive for drilling fluid pyrolysis-gas chromatographic analysis, thereby determines pollution source.
In the method for the true and false show of oil and gas of aforementioned identification, described geochemical index comprises Pr/Ph (pristane/phytane), pristane Pr/nC17, phytane Ph/nC18, main peak carbon, carbon number range, weight ratio of component, odd-even predominance OEP.
In the method for the true and false show of oil and gas of above-mentioned identification, step 4 is described near being meant that numerical difference between is generally within 10%.
The present invention considers by the pollution of drilling fluid to landwaste, can discern true and false show of oil and gas and definite indication pollution source correctly, effectively.
Description of drawings
Fig. 1 is the material absorption exchange synoptic diagram in landwaste and the drilling fluid
Fig. 2 is additive for drilling fluid and crude oil pyrolysis-gas chromatographic analysis figure
Embodiment
Below in conjunction with specific embodiment in detail the present invention is described in detail.
1, sample collecting and processing
That gathers creeps into drilling fluid and must gather before shaking screen, and it is can be with the landwaste geochemical logging the same or determine as required to gather spacing.
The drilling fluid of gathering is dried in the shade, grind the back sieve and get 0.194mm-0.097mm particle diameter sample.
2, analytical approach
Take by weighing sample 30～800mg, place heat to release in the stove (330 ℃ of pyrolysis temperatures), utilize capillary column sample component to be separated, bring flame ionization ditector into by carrier gas and detect with temperature programme, by workstation with data processing and print analysis result.
Analytical conditions for gas chromatography: column length 30m, internal diameter 0.25mm elastic quartz capillary column, 60 ℃～310 ℃ of column temperatures, 6 ℃/min of heating rate, constant temperature to component has gone out; 320 ℃ of temperature of vaporization chamber; 320 ℃ of fid detector room temperatures.Adopt qualitative, area normalization standard measures such as standard specimen and retention time.
Provide index: carbon number range, main peak carbon, OEP (odd-even predominance), Pr/Ph (pristane/phytane), pristane Pr/nC17, phytane Ph/nC18, ∑ C21-/∑ C22+, (C21+C22)/(C28+C29), C8～C35 detailed hydrocarbon component relative content etc.
3, additive for drilling fluid and crude oil pyrolysis-gas chromatographic analysis
From additive for drilling fluid and crude oil pyrolysis-gas chromatographic analysis, different disposal agent and crude oil have different chromatogram characteristics: crude oil, diesel oil, RH-3 (extreme pressure lubricant) etc. contain more complete hydro carbons spectrum peak such as Pr, Ph, stable hydrocarbon, PD (bubble enemy) contains hydro carbons spectrum peaks such as Ph, stable hydrocarbon, and NW-1 (small cation polymkeric substance) is a hydro carbons before the nC12; Geochemical index main peak carbon, carbon number range, weight ratio of component, OEP etc. see Table 1, and the spectrogram of crude oil, various treating agents, geochemical index difference are obvious, can distinguish true and false show of oil and gas according to chromatogram characteristic and groundization data target.
Table 1 additive for drilling fluid and crude oil pyrolysis-gas chromatographic analysis
| Title | Carbon number range | Main peak carbon | Pr/ Ph | Pr/ nC17 | Ph/ nC18 | OEP | C21-/ C22+ | Gas chromatography peak feature |
| Diesel oil | nC13-nC25 | nC15 | 1.61 | 0.51 | 0.41 | 1.20 | 9.89 | Steamed bun type, no odd-even predominance |
| Sulfonated gilsonite | nC12-nC25 | nC19 | 1.16 | 0.72 | 0.65 | 1.22 | 3.36 | Steamed bun type, no odd-even predominance, six characteristic peaks |
| RH-3 | nC11-nC24 | nc19 | 0.54 | 0.46 | 0.76 | 1.20 | 7.60 | Steamed bun type, no odd-even predominance |
| MRH-86D | nC10-nC27 | nC15 | 1.31 | 0.83 | 0.63 | 1.15 | 4.77 | Cliffy summit type, no odd-even predominance, a characteristic peak |
| RH-4 | nC13-nC27 | nC21 | 1.19 | 0.72 | 0.48 | 1.34 | 9.82 | Cliffy summit type, odd-even predominance are not obvious |
| Releasing stuck agent | nC11-nC25 | nC15 | 1.72 | 0.92 | 0.63 | 1.56 | 9.50 | Steamed bun type, a characteristic peak |
| The baton round lubricant | nC13-nC30 | nC17 | 0.81 | 0.72 | 0.73 | 1.51 | 0.70 | Bimodal pattern, serious drift |
| PD | nC18-nC24 | nc19 | / | / | 0.77 | 0.93 | 7.41 | The steamed bun type |
| Bavin the northern fringe crude oil | nC2-nC34 | nC10 | 2.50 | 0.31 | 0.17 | 1.01 | 15.93 | The leading peak type |
(in the table, RH-4 is anti-drill bit mud drum agent, and MRH-86D is plant oil based lubricant)
4, drilling fluid pyrolysis-gas chromatographic analysis dynamic monitoring
Creep into drilling fluid pyrolysis-gas chromatographic analysis dynamic monitoring data and see Table 2, find out that therefrom drilling fluid is at different wells
Table 2 creeps into drilling fluid pyrolysis-gas chromatographic analysis dynamic monitoring
| Well depth m | Pr/Ph | Pr/nC 17 | Ph/nC 18 | nC 21 -/nC 22 + | oep | Main peak carbon | Carbon number range |
| 304 | 0.57 | 0.46 | 0.72 | 5.52 | 1.14 | nC19 | nC12-nC26 |
| 700 | 0.52 | 0.46 | 0.62 | 2.52 | 1.05 | nC17 | nC12-nC26 |
| 1080 | 0.53 | 0.52 | 0.75 | 2.90 | 1.01 | nC17 | nC12-nC25 |
| 1390 | 0.52 | 0.55 | 0.73 | 6.77 | 1.05 | nC15 | nC13-nC25 |
| 1678 | 0.59 | 0.54 | 0.69 | 2.56 | 1.01 | nC17 | nC13-nC25 |
| 1718 | 1.37 | 0.49 | 0.44 | 8.41 | 1.17 | nC15 | nC12-nC25 |
| 1827 | 1.37 | 0.56 | 0.44 | 5.73 | 1.02 | nC17 | nC13-nC25 |
| 2092 | 1.27 | 0.59 | 0.54 | 9.28 | 0.99 | nC17 | nC13-nC23 |
| 2114 | 1.12 | 0.53 | 0.53 | 5.57 | 1.05 | nC17 | nC12-nC25 |
| 2663 | 1.10 | 0.53 | 0.54 | 4.75 | 1.06 | nC19 | nC13-nC25 |
| 2977 | 0.97 | 0.46 | 0.54 | 3.62 | 1.08 | nC19 | nC14-nC26 |
| 3067 | 0.91 | 0.46 | 0.51 | 3.63 | 1.08 | nC19 | nC13-nC26 |
| 3315 | 0.76 | 0.44 | 0.56 | 1.97 | 1.05 | nC19 | nC14-nC28 |
| 3509 | 0.84 | 0.51 | 0.64 | 2.20 | 0.96 | nC17 | nC12-nC28 |
| 3528 | 0.73 | 0.46 | 0.64 | 2.46 | 1.01 | nC17 | nC11-nC28 |
| 3605 | 0.81 | 0.46 | 0.57 | 2.22 | 1.04 | nC19 | nC13-nC28 |
| 3787 | 0.93 | 0.54 | 0.59 | 2.65 | 1.10 | nC19 | nC11-nC28 |
| 3804 | 1.56 | 1.00 | 1.00 | 7.43 | 1.21 | nC17 | nC11-nC24 |
| 3899 | 1.42 | 0.89 | 0.53 | 5.22 | 1.23 | nC17 | nC11-nC25 |
| 3960 | 1.37 | 1.00 | 0.45 | 4.67 | 1.26 | nC17 | nC12-nC26 |
| 4320 | 1.52 | 0.54 | 0.41 | 3.49 | 1.00 | nC17 | nC13-nC25 |
| 4566 | 1.32 | 0.56 | 0.48 | 3.90 | 1.05 | nC19 | nC14-nC25 |
| 4620 | 1.30 | 0.59 | 0.49 | 5.23 | 1.03 | nC17 | nC13-nC25 |
| 4800 | 1.34 | 0.48 | 0.44 | 7.67 | 1.08 | nC17 | nC14-nC24 |
Section groundization parameter value has several obvious variation interval: 304～1678m, 1718～2663m, 2977～3787m, 3804～3960m, 4566～4800m illustrate that drilling fluid has added the high treating agent of the different contents of organic matter.
5, true and false hydrocarbon zone identification
Storage rock landwaste pyrolysis-gas chromatographic analysis dynamic monitoring data sees Table 3, if only from these data, can think show of oil and gas preferably, but landwaste has several obvious variation interval: 746m～1684m at different well section groundization parameter values, 2090～2624m, 3096～3789m, 3814～4312m, 4560～4800m, the drilling fluid ground parameter of the variation characteristic of these groundization parameters and corresponding well section is approaching, illustrate that landwaste pyrolysis-gas chromatography geo-chemical feature is mainly from drilling fluid, due to drilling fluid contamination, through the comparative analysis drilling fluid contamination mainly from diesel oil and lubricant RH-3 (table of comparisons 1).
Table 3 storage rock landwaste pyrolysis-gas chromatographic analysis evaluation result
| Well depth m | Pr/Ph | Pr/nC 17 | Ph/nC 18 | nC 21 -/nC 22 + | oep | Main peak carbon | Carbon number range | Evaluation result |
| 746 | 0.53 | 0.42 | 0.75 | 5.55 | 1.14 | nC19 | nC13-nC23 | Main RH-3 pollutes |
| 1288 | 0.57 | 0.56 | 0.65 | 7.49 | 1.15 | nC17 | nC15-nC23 | Main RH-3 pollutes |
| 1394 | 0.52 | 0.51 | 0.58 | 7.41 | 0.95 | nC17 | nC15-nC23 | Main RH-3 pollutes |
| 1684 | 0.57 | 0.55 | 0.41 | 8.32 | 1.02 | nC15 | nC12-nC24 | Main RH-3 pollutes |
| 2090 | 1.27 | 0.59 | 0.59 | 2.56 | 0.97 | nC17 | nC14-nC22 | Main diesel oil, RH-3 pollute |
| 2116 | 1.11 | 0.38 | 0.49 | 2.63 | 1.21 | nC19 | nC15-nC25 | Main diesel oil, RH-3 pollute |
| 2117 | 1.22 | 0.52 | 0.51 | 3.53 | 1.16 | nC17 | nC16-nC23 | Main diesel oil, RH-3 pollute |
| 2092 | 1.27 | 0.59 | 0.54 | 9.28 | 0.99 | nC17 | nC13-nC23 | Main diesel oil, RH-3 pollute |
| 2114 | 1.12 | 0.53 | 0.53 | 5.57 | 1.05 | nC17 | nC12-nC25 | Main diesel oil, RH-3 pollute |
| 2624 | 1.10 | 0.57 | 0.52 | 7.70 | 1.04 | nC19 | nC14-nC24 | Main diesel oil, RH-3 pollute |
| 3096 | 0.70 | 0.40 | 0.53 | 6.98 | 0.93 | nC19 | nC13-nC24 | Main RH-3, contaminated by diesel oil |
| 3265 | 0.68 | 0.45 | 0.60 | 8.60 | 1.19 | nC19 | nC13-nC24 | Main RH-3, contaminated by diesel oil |
| 3319 | 0.82 | 0.49 | 0.62 | 10.86 | 1.08 | nC17 | nC14-nC23 | Main RH-3, contaminated by diesel oil |
| 3348 | 0.79 | 0.42 | 0.50 | 12.45 | 0.99 | nC17 | nC14-nC23 | Main RH-3, contaminated by diesel oil |
| 3503 | 0.75 | 0.47 | 0.60 | 7.92 | 1.01 | nC19 | nC14-nC23 | Main RH-3, contaminated by diesel oil |
| 3608 | 0.98 | 0.42 | 0.47 | 6.22 | 1.09 | nC17 | nC13-nC24 | Main RH-3, contaminated by diesel oil |
| 3789 | 0.79 | 0.54 | 0.63 | 5.75 | 1.08 | nC19 | nC13-nC25 | Main RH-3, contaminated by diesel oil |
| 3814 | 1.56 | 0.81 | 1.03 | 13.47 | 1.32 | nC15 | nC14-nC24 | Main diesel oil, RH-3 pollute |
| 3853 | 1.52 | 0.51 | 0.44 | 14.08 | 0.98 | nC15 | nC13-nC22 | Main diesel oil, RH-3 pollute |
| 4312 | 1.47 | 1.02 | 0.41 | 8.71 | 0.93 | nC17 | nC13-nC24 | Main diesel oil, RH-3 pollute |
| 4560 | 1.44 | 0.56 | 0.46 | 7.57 | 0.94 | nC17 | nC13-nC24 | Main diesel oil, RH-3 pollute |
| 4645 | 1.37 | 0.54 | 0.47 | 7.45 | 1.01 | nC17 | nC13-nC25 | Main diesel oil, RH-3 pollute |
| 4800 | 1.09 | 0.48 | 0.49 | 6.90 | 0.97 | nC17 | nC13-nC24 | Main diesel oil, RH-3 pollute |
The present invention utilizes drilling fluid pyrolysis-gas chromatography technique of geochemical logging, detect, analyzed additive for drilling fluid and bavin the northern fringe crude oil geo-chemical feature, dynamic monitoring creep in the drilling fluid organic each detailed hydrocarbon relative content and geo-chemical feature, effectively discerned true and false show of oil and gas and pollution, and determined that additive for drilling fluid is in the main pollution condition of different well sections to landwaste.
Claims (3)
1, a kind of method of discerning true and false show of oil and gas may further comprise the steps:
Step 1: respectively pyrolysis-gas chromatographic analysis is carried out in different disposal agent in the drilling fluid and regional crude oil, obtained detailed hydrocarbon compound relative content numerical value, geochemical index and chromatogram in the organic matter wherein;
Step 2: respectively different well sections are crept into drilling fluid and carry out pyrolysis-gas chromatographic analysis, obtain detailed hydrocarbon compound relative content numerical value, geochemical index and chromatogram in the organic matter wherein, and determine the well section interval of significant change according to its geochemical index and chromatogram feature;
Step 3: different well section storage rock landwaste are carried out pyrolysis-gas chromatographic analysis, obtain detailed hydrocarbon compound relative content numerical value, geochemical index and chromatogram in the organic matter wherein, and determine the well section interval of significant change according to its geochemical index and chromatogram feature;
Step 4: contrast step 1, step 2 and step 3, within 10%, what judge then that storage rock cuttings analysis reflects is show of oil and gas as the geo-chemical feature numerical difference between of storage rock landwaste geo-chemical feature and regional crude oil; As the geo-chemical feature numerical difference between of storing up rock landwaste geo-chemical feature and creeping into drilling fluid illustrates and stores up the rock landwaste by drilling fluid contamination that by the cuttings analysis reflection is false show of oil and gas within 10%.
2, the method for stating the true and false show of oil and gas of identification according to claim 1, it is characterized in that, further comprise discriminating step to described pollution, specifically be with the geochemical index of step 3 and comparing of chromatogram and single additive for drilling fluid pyrolysis-gas chromatographic analysis, thereby determine pollution source.
3, the method for the true and false show of oil and gas of identification according to claim 1 and 2, it is characterized in that described geochemical index comprises pristane Pr/ phytane Ph, pristane Pr/nC17, phytane Ph/nC18, main peak carbon, carbon number range, weight ratio of component and odd-even predominance OEP.
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