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
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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.
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