GC-MS ANALYSIS OF MATURE CONDENSATE OIL AND ITS APPLICATION IN PETROLEUM GEOLOGY

GC-MS analysis has become an applied technique in seeking oil-and gas-layers.With its great contributions to oil and gas discoveries,this technique has played an important role in petroleum exploration.11 condensate oil samples from Wen 23 gasfield,Baimiao gas pool and Qiaokou area in Pu-yang Sag,Bohai Bay Basin as well as Well Zhong-1 in Tarim Basin have been analyzed by GC-MS technique.The qualitative and quantitative analyses of the isomeric alkanes have been made,some new light hydrocarbon geochemical parameters have been determined,and the oil and gas signatures have been identified.The results show that Wen 23 gasfield generally belongs to coal condensate gas reservoir,and its condensate oil is generated during the high to ripen mature stages;the condensate oil in Baimiao gas pool is the product of the mudstone strata during their high mature stage;whereas the condensate oil in Well Zhong-1 inTarim Basin is the product of the marine carbonate strata in their high to ripen mature stages,different distinctively from the condensate oil of Wen 23 gasfield and Baimiao area,Dongpu Sag.