准噶尔盆地侏罗纪煤成油研究

本文以有机岩石学和有机地球化学研究为基础，结合模拟实验，对中国西北地区准噶尔盆地侏罗纪煤成油问题进行了详细讨论，结果表明，准噶尔盆地侏罗纪煤含有丰富的类脂成分，壳质组特别是角质体含量高可能导致了本区高蜡石油的生成，壳质组和基质镜质体的含量决定了煤的氢指数和热解烃产值，它们共同构成了盆地内煤成油的母质。模拟排油实验证明了煤孔隙的吸附能力是有限的，在一定的压力条件下，煤中液态烃达到一定数量后就可以较好地排出。为了便于生产勘探，文中还讨论了煤系地层的沉积有机相，依据沉积相，有机地球化学和有机岩石学特征将煤系划分成四种沉积有机相:分别是高位沼泽有机相，森林沼泽有机相，流水沼泽有机相和开阔水体有机相，其中，流水沼泽有机相生成液态烃的潜力最大，以含有大量的角质体为特征；森林沼泽有机相的生烃潜力次之，以基质镜质体为主要成分；高位沼泽有机相生烃潜力最差，以惰性组和镜质组为主要的有机组分；而开阔水体有机相不是煤成烃研究的理想场所

A Study on the Jurassic Oil from Coal in Junggar Basin

In this paper, the problems of oil-form Coal in Junggar basin were discussed on the basis of organicpetrology and organic geochemistry.It was showed that Jurassic coals contain a lot of liptinites, higherliptinite content (especially higher Cutinite content of liptinites) of coals may cause the qeneration ofhigh-wax oils, the contents of liptinites and desmocollinites in coals depend on the value of hydrogen in-dex and Rock-Eval pyrolysis yield (S2), they are main oil-generating macerals, the fact of some oil gener-ating from Jurassic coals was confirmed by identifying oil drops, micrinites and bituminites under micro-scope.the characteristics of oil-expulsion from coals was further studied with hydrocarbon expulsionsimulation.In addition, we studied Jurassic sedimentary organic facies and divided coal measures intofour facies types based on comprehensive studies of organic petrology, organic geoehemistry and sedi-mentary environment,i.e.high moor organic facies, forest swamp organic facies, running water facies andopen water organic facies, among them forest swamp organic facies and running water swamp organic fa-cies are the best organic facies of hydrocarbon generation.