CARBON ISOTOPE CHARACTERISTICS AND ORIGIN OF DEEP CRUDE OIL IN THE NORTH SONGLIAO BASIN
-
摘要: 松辽盆地北部深层烃源岩大部分处于高成熟—过成熟阶段,仅在4口井发现了深层原油.松辽盆地深层泥质烃源岩干酪根碳同位素比较重,但由于其脂肪支链上富集12C,因此生成的烃类碳同位素却比较轻.随成熟度的增加,深层烃源岩干酪根碳同位素略微变重.受母质类型的影响,深层烃源岩干酪根碳同位素比青山口组一段大约轻7‰.碳同位素对比结果表明,芳深1井和芳深2井原油来自昌德地区东部的沙河子组泥质烃源岩,升深1井和宋3井原油可能主要为煤岩所生.Abstract: Most of deep source rocks were in high-mature or over-mature stages,and deep oil was found in only three wells in the North Songliao Basin.Carbon isotope of kerogen was heavier in deep formations of the Songliao Basin,but lighter carbon isotope may generate because the enrichment of 12C in fatty side-chains.Carbon isotope was bascally not related to its thermal maturity,but was affected by its origin.Carbon isotope fractionation of oil in the deep was resulted from the primary migration of oil and the crac-king of large molecules in reservoirs.The fractionation resulted in different slopes between the n-alkane carbon isotopic profile of oil and that of its source rocks.Comprehensive analysis indicated that the high mature oil in the deep was generated by the source rocks deeper than the No.1 member of the Qingshankou Formation.
-
Key words:
- carbon isotope /
- high maturity /
- deep formation /
- the Songliao Basin
-
[1] 高瑞祺,张莹,崔同翠.松辽盆地白垩纪石油地层[M].北京:石油工业出版社,1994. [2] 中苏合作项目组.深层油气藏储集层与相态预测[M].北京:石油工业出版社,1992.202. [3] Seifert W K.Application of biological marker chemistry to petroleum exploration[A].Proceedings,Tenth World Petroleum Congress[C].London:Heyden&Son,1979.425-440. -
计量
- 文章访问数: 638
- HTML全文浏览量: 39
- PDF下载量: 261
- 被引次数: 0