准噶尔盆地南缘西部山前断褶带油源分析  

Oil source of foothill fault-fold structural belt in western part of the southern margin,Junggar Basin

作　　者：孔祥星[1] 

机构地区：[1]中国石化胜利油田有限公司地质科学研究院

出　　处：《石油勘探与开发》2007年第4期413-418,共6页Petroleum Exploration and Development

基　　金：国家自然科学基金(40373024)

摘　　要：为了探讨准噶尔盆地南缘西部山前断褶带原油的油源问题,根据原油地球化学特征,将该区原油分为3类。第1类原油的全油碳同位素组成一般重于-27‰,Pr/Ph值大于2,规则甾烷中C29甾烷含量较高,具反"L"字型分布特征,伽马蜡烷/C30藿烷值通常小于0.1;第2类原油的全油碳同位素组成为-28‰^-27‰,Pr/Ph值为1~2,规则甾烷呈"V"字型分布,伽马蜡烷/C30藿烷值为0.2~0.3;第3类原油的全油碳同位素组成为-30‰^-29‰,Pr/Ph值小于1,规则甾烷呈"V"字型分布,伽马蜡烷/C30藿烷值在0.5左右。油源对比分析认为,第1、第3类原油分别与侏罗系八道湾组煤系烃源岩和湖相烃源岩具有较好亲缘关系,而第2类原油可能主要来源于侏罗系三工河组或(和)西山窑组湖相烃源岩。The crude oils in the study area can be classified into three groups. Group one is characterized by δ^13C values heavier than -27‰, Pr/Ph ratios higher than 2, the regular sterane with an inverted “L” pattern distribution of C29〉C27〉C28, and gamrnacerane/C30 hopanes less than 0.1; Group two by δ^13C values ranging from -27‰ to -28‰, Pr/Ph ratios ranging from 1 to 2, the regular sterane with a “V” pattern distribution, and gammacerane/C30 hopanes values ranging from 0.2 to 0.3; Group three by Na C values ranging from -29‰ to -30‰, Pr/Ph ratios less than 1, the regular sterane with a “V” distribution, and gamrnacerane/C30 hopanes values around 0.5. The oil/source correlation shows that the first and third group oils are respectively attributed to the coal-measure source rocks and the lacustrine source rocks of the Badaowan Formation, and the second group oil is originated mainly from the lacustrine source rocks of the Sangonghe or Xishanyao Formation.

关 键 词：准噶尔盆地 断褶带 油源分析 地球化学特征 

分 类 号：TE122.1[石油与天然气工程—油气勘探]