吐-哈盆地侏罗系油藏煤成油问题的讨论  

DISCUSSION ON OIL DERIVED COAL IN THE JURASSIC OIL POOL IN TURFAN-HAMI BASIN

作　　者：柳益群[1] 冯乔[1] 郝建荣[1] 

机构地区：[1]西北大学大陆动力学教育部重点实验室,西北大学地质学系陕西西安710069

出　　处：《石油与天然气地质》2002年第4期326-331,共6页Oil & Gas Geology

摘　　要：吐鲁番哈密盆地的侏罗系油藏因处于富含煤系的地层中而被认为是煤成油藏。中二叠统和下侏罗统湖相泥岩和腐泥煤以及中上三叠统烛藻煤富含壳质组和腐泥组 ,生油潜能极高 ;下中侏罗统腐殖煤富含镜质组和惰质组 ,生液态烃能力较差。生烃组合分为烛藻煤深湖相泥岩和腐殖煤烛煤浅湖相泥岩两种类型。生物标记化合物显示出侏罗系原油富藿烷、贫萜烷 ,甾烷图谱呈“V”字形 ,表明以细菌和低等水生生物生烃为主 ,与二叠系湖相泥岩和腐泥煤生物标志化合物图谱相似 ;而侏罗系腐殖煤则显示富萜烷、轻烃化合物极少 ,甾烷图谱呈反“L”型特征 ,表明以高等植物生烃为主 ,生油潜能极低。侏罗系油藏是以二叠系、三叠系及下侏罗统湖相泥岩。The Jurassic oil accumulation is considered as oil derived coal because it occurred on coal bearing strata. Luacustrine mudstone and sapropel coal in the middle Permian and the low Jurassic as well as cannel boghead in the middle and upper Triassic have abundant exinoid group and saprepel group, they have highest hydrocarbon-generating potentiality in the basin, while humic coal distributed in the middle and lower Jurassic has abundant vitrinite and inertrinite which has poor liquid hydrocarbon generating potentiality. The hydrocarbon generating assemblage can be divided into two types of cannel boghead deep lake mudstone and humic coal cannel coal shallow lake mudstone in this basin. The Jurassic crude oil is rich in hopane and poor in terpane with type of ' V' of sterane indicated by the biomarkers shows that the bacterial and biota in water are mainly liquid hydrocarbon producing matter. Theses features are much like those of lacustrine mudstone and cannel boghead in the Permian. With characteristics of rich in terpane, poor in light hydrocarbon and type of 'reversed L Shaped' of sterane shows that the hydrocarbon generating potentiality in humic coal is very low and higher plants are mainly plants for hydrocarbon generation. The Jurassic oil accumulation is a mixed oil sourced accumulation characterized by lacustrine mudstone, cannel boghead in the Permian , Triassic and the lower Jurassic.

关 键 词：吐-哈盆地 侏罗系油藏 煤成油 烛藻煤 腐殖煤 生物标记化合物 吐-哈油田 

分 类 号：P618.130.1[天文地球—矿床学] T[天文地球—地质学]