Abstract: A new index used for oil gas geochemical prospecting,the source information,has been suggested based on the research on adsorption hydrocarbons in the cuttings of a well and in the surface soil samples from three oil gas fields which were made on Curie Point pyrolysis chromatograph with active carbon nickel wire.They are obtained by the following process:first,extracting the source finger print compounds or the characteristic compounds from various source rocks at a well's section,then searching above mentioned "finger print compounds" through the surface soils on some oil gas fields where the genetic type of oil gas is simple,and to sum all compounds grown and declined followed after these finger print compounds as a group of the surface respounding characteristic compounds i.e. source informations.Finally using the informations to draw the unusually distribution maps concerned with the surface geochemical prospecting. Take "Z" gas field in Shan Gan Ning Basin for example the unusually distribution maps of three origin of oil gas (Coal type gases originated form upper Paleozoic,oils originated form Triassic and sapropelic type gases originated form Ordovician) in this gas field have been drawn.Also the exploration proposal to extend "F" oil field have been put forward based on the geochemical prospecting. The significance indicating oil gas as using the Origin informations is very definite.Also we could infer age of oil bearing stratum,perhaps discover new oil bearing stratum and draw the unusually distribution of each origin of oil gas in the field existing several different origin of oil gas.Accordance between surface and subsurface for geochemical prospecting will be increa sing.

Key words: surface geochemical prospecting of oil & gas, analysis, source of oil & gas, ShangGanNing Basin

摘要： 提出了一种新型油气化探指标--成因信息.成因信息指标是通过如下研究步骤获得的:以吸附丝-居里点热解色谱分析为手段,先通过井中化探提取各层源岩的成因“指纹”或特征化合物;后从油气成因单一或以一种成因油气占主导的油气田上方去追寻上述“指纹”,并将所有与之呈“共消长”关系的化合物谱峰合并为某种成因油气的“地面响应特征峰群”;最后用特征峰群分量或“总烃分母剥离法”计算的参数勾画某种成因油气的地面化探异常图.以陕甘宁盆地某气田为例,在其上方勾画了上古生界煤系气、中生界含油和奥陶系腐泥气的异常展布.同时对某油田的扩边勘探提出建议.用成因信息指示油气其意义十分明确.通过油气成因的识别可进一步推测含油气层位或发现新的含油气层系,同时可在多套油气复合地区逐一反映每套油气的异常展布,从而提高了异常叠加情况下资料解释的符合程度.

关键词: 油气化探, 分析, 油气成因, 陕甘宁盆地