Research on the Relations between Geothermal History and Oil-Gas Generation in Jiudong Basin

REN Zhan li; LIU Chi yang; ZHANG Xiao hui; WU Han ning

Jiudong basin is formed by the stacking of two stage different nature and different generation basin.It was rift basin from Early Middle jurassic to Early Creaceous and squeezed sag basin since Cenozoic.The present geothermal gradient and heat flow of Jiudong basin is very low,of which the present geothermal gradient is 3.00 ℃/100m and the heat flow value is 51 mW/m ².In later Mesozoic,the palaeothermal gradient of Yinger depression,which reached 3.50～4.20 ℃/100m,is higher than present thermal gradient.Thermal gradient of Jiudong basin has decreased since Cenozoic,Yinger depression has subsided on a large scale.The maturity of thermal evolution of source rocks in Yinger depression is controlled by present temperature.Research on the relations between geothermal history and oil gas generation in Yinger depression indicate that Chijinbu Formation source rock of Lower Creaceous have two stage of oil generation,i.e. Late Creaceous and since Tertiary.Xiagou Formation and Zhonggou Formation source rocks of Lower Creaceous only have one main stage of oil generation,main stage of oil generation is since Pliocene.It has good prospect for exploring oil in Yinger depression.

Research on the Relations between Geothermal History and Oil-Gas Generation in Jiudong Basin

Department of Geology,Northwest University,Xi'an 710069

Received Date: 1999-09-14

Rev Recd Date: 1999-12-14

Publish Date: 2000-08-10

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Abstract: Jiudong basin is formed by the stacking of two stage different nature and different generation basin.It was rift basin from Early Middle jurassic to Early Creaceous and squeezed sag basin since Cenozoic.The present geothermal gradient and heat flow of Jiudong basin is very low,of which the present geothermal gradient is 3.00 ℃/100m and the heat flow value is 51 mW/m ².In later Mesozoic,the palaeothermal gradient of Yinger depression,which reached 3.50～4.20 ℃/100m,is higher than present thermal gradient.Thermal gradient of Jiudong basin has decreased since Cenozoic,Yinger depression has subsided on a large scale.The maturity of thermal evolution of source rocks in Yinger depression is controlled by present temperature.Research on the relations between geothermal history and oil gas generation in Yinger depression indicate that Chijinbu Formation source rock of Lower Creaceous have two stage of oil generation,i.e. Late Creaceous and since Tertiary.Xiagou Formation and Zhonggou Formation source rocks of Lower Creaceous only have one main stage of oil generation,main stage of oil generation is since Pliocene.It has good prospect for exploring oil in Yinger depression.

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Research on the Relations between Geothermal History and Oil-Gas Generation in Jiudong Basin

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