新疆石油地质

新疆石油地质 ›› 2005, Vol. 26 ›› Issue (2): 155-157.

• 油气勘探 • 上一篇    下一篇

塔河油田原油稳定碳同位素特征及其成藏意义

王传刚1, 王铁冠2, 何发歧3, 王君奇4   

  1. 1.中国石化 石油勘探开发科学研究院，北京 100083;
    2.石油大学，北京102200;
    3.中国石化 油田部，北京 100029;
    4.中国石化 西北石油管理局规划院，乌鲁木齐 830011
  • 收稿日期:2004-07-16 出版日期:2005-04-01 发布日期:2020-08-24
  • 作者简介:王传刚(1970-,男,山东菖县人.博士,石油地质与石油地球化学,(Tel)010-82312645.

Stable Carbon Isotope and Its Significance in Hydrocarbon Accumulation in Tahe Oilfield, Tarim Basin

WANG Chuan-gang1, WANG Tie-guan2, HE Fa-qi3, WANG Jun-qi4   

  1. 1. Research Institute of Petroleum Exploration and Development, Sinopec Beijing 100083, China;
    2. University of Petroleum, Beijing 102200, China;
    3. Oilfield Division, Sinopec, Beijing 100029, China;
    4. Northwest Petroleum Bureau, Sinopec, Urumqi, Xinjiang 830011, China
  • Received:2004-07-16 Online:2005-04-01 Published:2020-08-24

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摘要： 塔河油田原油族组分中烷烃δ13C值为33,3‰～－31,5‰,差异不明显,但全油、芳烧、非短、沥青质δ13C值的差别却逐渐增大,特别是4、6、7区部分奥陶系原油出现沥青质δ13C值低于非炬、芳炬组分,甚至低于全油的“倒转”现象,详细的地球化学分析表明,这种同位素“倒转”现象主要是由于生物降解造成的；塔河油田存在两期原油充注的成藏历史,早期成藏原泊成熟度较低,具有相对较低的碳同位素值,在经历了生物降解后残留以非炬,特别是沥青质为主的族组分,与后期充注来的原油相混合,呈现复杂的稳定碳同位亲值分布特征。

关键词: 塔河油田, 碳罔位紊, 生物降解, 油气成藏

Abstract: Oils from different blocks and horizons in Tahe oilfield belong to the same oil group. The difference of stable carbon isotope is not resulted from the parent source.The oils have less distinct differentiation with alkane δ13C ranging from -31.8‰ to-33.2‰, while the 813C valne distinction of whole oil, aromat町， nonhydrocarbon and asphaltene fractions of diverse reservoirs become bigger and bigger, es-pecially the Ordovician oils of 4, 6 and 7 districts, which has a lower asphaltene 813C value than the aroma, nonhydrocarbon, and further-more the whole oil of itself. This upside-down phenomenon is due to biodegradation by detailed geochemical analysis. Study shows that there exist two stages of recharging events, with low maturity of oils at early reservoir accumulation and lower carbon isotope value; follow-ing the biodegradation, nonhydrocarbon- and especially asphaltene-dominated group fraction are remained and mixed with late stage of recharging oil, indicating a complex feature of the stable carbon isotope distribution.

Key words: Tahe oilfield, carbon isotope, biodegradation, hydrocarbon accumulation

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