A Study on the Jurassic Oil-from Coal in Junggar Basin

Yao Suping; Wei Hui; Jin Kuili; Zhang Jingrong; Tu Jiangqi; Zhao Changyi; Fang Jiahu

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.

1 Departmens of Earth Sciences,Nanjing University,Jiangsu,210043;

2 Research Institute of Petroleum Exploration and Development,Beijing,100083;

3 Beijing Graduate School,China University of Mining and Technology.Beijing,100083

Received Date: 1997-01-03

Publish Date: 1997-12-10

Key words:

Abstract: 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.

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A Study on the Jurassic Oil-from Coal in Junggar Basin

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