收稿日期: 2007-05-08
修回日期: 2007-08-17
网络出版日期: 2007-10-10
基金资助
中国科学院院长奖获得者专项基金项目；国家重点基础研究发展规划项目（编号：2001CB209102）联合资助.
DISTINGUISHING OIL-ASSOCIATED NATURAL GAS BIODEGRADATION DEGREE BASED ON PETROLEUM BIODEGRADATION GRADE
Received date: 2007-05-08
Revised date: 2007-08-17
Online published: 2007-10-10
相对于有关降解原油方面的资料，有关微生物降解天然气方面的研究资料缺乏，如何确定微生物降解天然气的降解程度，尚无文献报道。通过对济阳坳陷东营凹陷八面河油田、单家寺油田和沾化凹陷孤岛油田原油、伴生天然气样品的实验分析后指出，微生物降解后的原油样品的Pr/nC17、Ph/nC18、(Pr+Ph)/(nC17+nC18)及C30 αβ藿烷/(Pr+Ph)值增加，与原油伴生的天然气的组分中甲烷含量增加，重烃含量降低，C2/C3值和C1/(C2+C3)值升高，丙烷和正丁烷的碳同位素组成明显偏重，丙烷的氢同位素组成也明显偏重，认为天然气的C1/(C2+C3)值、C2/C3值、丙烷和正丁烷的δ13C值是判识天然气是否遭受微生物降解及其降解程度的地球化学指标，而原油的降解级别能够为识别伴生天然气的降解程度提供依据，但伴生天然气与原油的成藏时间（充注期次）应相同。
王万春，王传远，刘全有，穆亚蓬 . 依据原油降解级别判识伴生天然气降解程度[J]. 天然气地球科学, 2007 , 18(5) : 703 -707 . DOI: 10.11764/j.issn.1672-1926.2007.05.703
Researches on natural gas biodegradation are relatively rare compared to that on petroleum biodegradation. There is no documentation yet about how to confirm the biodegradation degree of biodegraded natural gases. Analysis on the oil and oil associated natural gas samples from the Bamianhe oil field and the Shanjiasi oil field of the Dongying seg, the Gudao oil field of the Zhanhua seg of the Jiyang Depression indicated that biodegraded oil samples have increase Pr/nC17, Ph/nC18, (Pr+Ph)/(nC17+nC18) and C30αβ-hopane/(Pr+Ph) ratios, and biodegraded natural gases have increased content of methane, decreased contents of heavier hydrocarbons, increased C2/C3 and C1/(C2+C3) values and heavier δ13C values of propane and nbutane,as well as heavier δD value of propane. It shows that C2/C3 and C1/(C2+C3) values and δ13C values of propane and n-butane of natural gases are geochemical parameters to distinguish biodegraded natural gases and their biodegradation degrees. When accumulated or charged at the same time, the oil biodeg radationg rade can provide basis for the identification of the oil associated natural gas biodegradation degree.
Key words： Natural gas; Biodegradation; Carbon isotope; Jiyang Depression
［1］James A T, Burns B J. Microbial alteration of subsurface natural gas accumulations［J］. AAPG Bulletin, 1984, 68:957-960.
［2］Katz B J, Narimanov A, Huseinzadeh R. Significance of microbial processes in gases of the South Caspian basin［J］. Marine and Petroleum Geology, 2002,19:783-796.
［3］Pallasser R J. Recognising biodegradation in gas/oil accu-mulations through the δ13C composition of gas components［J］. Organic Geochemistry, 2000, 31:1363-1373.
［4］Boreham C J, Hope J M, Hartung Kagi B. Understanding source, distribution and preservation of Australian natural gas: a geochemical perspective［J］.Australian Petroleum Production and Exploration Association Journal, 2001, 41 (1): 523-547.
［5］戴金星. 概论有机烷烃气碳同位素系列倒转的成因问题［J］. 天然气工业, 1990, 10 (6) :5-20.
［6］戴金星.天然气碳氢同位素特征和各类天然气鉴别［J］. 天然气地球科学, 1993, 4(2/3):1-10.
［7］张林晔, 李学田. 济阳坳陷滨海地区浅层天然气成因［J］. 石油勘探与开发, 1990,17(1):1-7
［8］潘贤庄, 张国华, 黄保家, 等. 莺歌海盆地浅层天然气生物降解及混源特征［J］. 中国海上油气:地质，2002, 16(3):189-195.
［9］Larter S R, Di Primio R. Effects of biodegradation on oil and gas field PVT properties and the origin of oil rimmed gas accumulations［J］. Organic Geochemistry, 2005, 36:299-310.
［10］Wan-chun Wang, Ling-ye Zhang, Wen-hui Liu, et al. Eff-ects of biodegradation on the carbon isotopic composition of natural gas-a case study in the BamianheOil Field of the Jiyang Depression, Eastern China［J］. Geochemical Journal, 2005, 39(4): 301-309.
［11］Chosson P, Connan J, Dessort D, Lanau C. In vitro biod-egradation of steranes and terpans: a clue to understanding geological situations［G］//Moldowan J M, Albrecht P, Philp R P. Biological Markers in Sediments and Petroleum. New Jersey: Prentice Hall, Englewood Cliffs, 1992:320-394.
［12］Moldowan J M, Lee C Y, Sundararaman P, et al. Source c-orrelation and maturity assess- ment of select oils and rocks from the Central Adriatic Basin (Italy and Yugoslavia) ［G］//Moldowan J M, Albrecht P, Philp R P. Biological Markers in Sediments and Petroleum. New Jersey: Prentice Hall, Englewood Cliffs, 1992:370-401.
［13］Volkman J K. Biodegradation of aromatic hydrocarbons in cr-ude oils from the Barrow Subbasin of Western Australia［J］. Organic Geochemistry, 1984, 6:619-632.
［14］Peters K E, Moldowan J M. The Biomarker Guide. Interp-reting Molecular Fossils in Petroleum and Ancient Sediments［M］. New Jersey: Prentice Hall,Englewood Cliffs, 1993.
［15］Connan J. Biodegradation of crude oils in reservoirs［G］// Brooks J, Welte D H. Advances in Petroleum Geochemistry. London: Academic Press, 1984:299-335.［16］Seifert W K, Moldowan J M, Demaison G J. Source corre-lation of biodegraded oils［J］. Organic Geochemistry, 1984, 6:633-643.
［17］Koopmans M P, Larter S R, Zhang C, et al. Biodegradation and mixin of crude oils in Eocene Es3 reservoirs of the Liaohe basin, northeastern China［J］. AAPG Bulletin, 2002, 86:1833-1843.
［18］Huang H, Larter S R, Bowler B F J, et al. A dynamic bio-degradation model suggested by petroleum compositional gradients within reservoir columns from the Liaohe basin, NE China［J］. Organic Geochemistry, 2004, 35: 299-316.
［19］包建平, 朱翠山, 马安来, 等. 生物降解原油中生物标志物组成的定量研究［J］. 江汉石油学院学报, 2002, 24(2): 22-26.
［20］Volkman J K, Alexander R, Kagi R I, et al. Demethylated hopanes in crude oils and their applications in petroleum geochemistry［J］. Geochimica et Cosmochimica Acta, 1983, 47:785-794.
［21］Peters K E, Moldowan J M. Effects of source, thermal mat-urity, and biodegradation on the distribution and isomerization of homohopanes in petroleum［J］. Organic Geochemistry, 1991, 17:47-61.
［22］Moldowan J M, McCaffrey M A. A novel microbial hydro-carbon degradation pathway revealed by hopane demethylation in a petroleum reservoir［J］. Geochimica et Cosmochimica Acta, 1995, 59(9): 1891-1894.
［23］王万春, 李钜源, 唐洪三, 等. 济阳坳陷孤岛油田微生物降解原油伴生气成因特征［J］. 石油与天然气地质, 2007, 28(3):427-432.
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