THE APPLICATION OF N-ALKANE'S ODD-EVEN CARBON NUMBER PREDOMINANCE IN OIL-SOURCE ROCK CORRELATION——AN EXAMPLE OF THE LOWER PALEOZOIC IN TARIM BASIN
-
摘要: 正构烷烃的组成和碳数分布能反映有机质来源、沉积环境性质和热演化程度。通过正构烷烃色谱特征对比发现,塔中低隆起区上奥陶统烃源岩的正构烷烃具明显的奇碳优势,寒武系—下奥陶统烃源岩的正构烷烃呈现偶碳优势。塔中地区油源对比的结果表明,塔中10-11-12井区的原油主要来源于上奥陶统烃源岩,塔中45井和塔中162井奥陶系原油以寒武系—下奥陶统烃源岩为主要来源。具正构烷烃奇偶优势的原油样品所对应的油源均与油源对比所指示的层位相吻合。所以,正构烷烃奇偶优势的特征可以作为塔中低隆起油源对比的有效途径之一。Abstract: The composition and distribution of the carbon number of n-alkane can reflect the source of organic matters,sedimentary environment and maturity of organic matter.Comparision of the n-alkane's GC diagrams in Tazhong Low Uplift shows that odd-carbon predominance appears in the Upper Ordovician source rocks,and even-carbon predominance has taken on in Cambrian-Lower Ordovician source rocks.The result of oil-source rock correlation shows that the origin of oils in the fields of Well TZ 10-11-12 is the Upper Ordovician source rocks,and the oils of Well TZ 45 and Well TZ 162 are from CambrianLower Ordovician source rocks.And the strata corresponding to the crude oils with odd-even carbon number predominance is accorded with what the oil-source rock correlation shows.In a word,the characteristics of n-alkane's odd-even carbon number predominance can be as an effective method for oil-source rock correlation in Tazhong Low Uplift,Tarim Basin.
-
[1] 林金辉,伊海生,邹艳荣.藏北高原海陆相油页岩生物标志化合物对比研究[J].地球化学,2004,33(1):57～64 [2] 朱扬明,苏爱国,梁狄刚等.柴达木盆地咸湖相生油岩正构烷烃分布特征及其成因[J].地球化学,2003,32(2):117～123 [3] 张水昌,王飞宇,张保民等.塔里木盆地中上奥陶统油源层地球化学研究[J].石油学报,2000,21(6):23～28 [4] 王飞宇,边立曾,张水昌等.塔里木盆地奥陶系海相源岩中两类生烃母质[J].中国科学(D辑),2001,31(2):96～102 [5] Fowler M G.The influence of gloeocapsomopha prisca on the organic geochemistry of oils and organic rich rocks of late Ordovician age from Canada[A].In:Schidlowski M,ed.Early organic evolution:implications for mineral and energy resources[M].Berlin:Springer-Verlag,1992.336～356 [6] Wehe D H,Waples D.Uber die Bevorzugung geradzahliger n-alkane in sedimentgesteinen[J].Natur Wissenschaften,1973,60:516～517 [7] Shimoyama A,Jones W D.Formation of alkanes from fatty acids in the presence of CaCO3[J].Geochim Cosmochim Acta,1972,36:87～91 [8] 王铁冠.我国一些地区原油与生油岩中某些沉积环境生物标志物初探[A].见:王铁冠.生物标志物地球化学研究[M].武汉:中国地质大学出版社,1990.55～65 [9] 邓宏文,钱凯.沉积地球化学与环境分析[M].兰州:甘肃科学技术出版社,1993.1～178 [10] 李守军.正烷烃、姥鲛烷与植烷对沉积环境的指示意义[J].石油大学学报(自然科学版),1999,23(5):14～16 [11] Mello M R.Organic geochemical characterization of depositional palaeoenvironments of source rocks and oils in brazilian marginal basins[J].Organic Geochemistry,1988,13:31 -
计量
- 文章访问数: 785
- HTML全文浏览量: 83
- PDF下载量: 737
- 被引次数: 0
下载:
苏公网安备32021102000780号