Abstract:

Dark solid bitumen associated with silicified wood and carbon scraps or coal string was found in many places in continental Jurassic basins in thewestern Hubei province.For a long time,people took it for“coal”or“seepage”.Through surveying and research of the solid bitumen in Zigui,Dangyang basins,it was identified that it belongs to the derivative from humic typeof solid and liguid hydrocarbons.It can be called coal bitumen,because it soccurrence,distribution,organic component and stnucture all show a geneticre lationship with coal and humic type of source bed.Study of the humic type of coal bitumen indicates that the oil could be“generated”indeed during the process of incoalation.However,the liguid hydrocarbon of humic type and its derivative are a kind of heavy and vis-cous fluid characterized by high content of non-hydrocarbons and aromatichydrocarbons,which is difficult to move through a long distance,and unfa-vourable for accumlation of hydrocarbon.Therefore,its distribution is inscareity.Furthermore,its“oil-generated amount”is limited too,and it isnot suitable in our practical works to consider all sorts of the solid bitumenas sapropelic type of petroleum bitumen,and it is necessary to here solidbitumen to be genetically classified in order to give a correct assessment.