An analysis of hydrocarbon potentials of Mid - Lower Jurassic in Tanzhuang- Shenqiu sag

Detailed correlation of oil/rock whole series biomark-er, light hydrocarbon components and carbon isotope components in several wells, including Zhoucan 10 well, in Tanzhuang - Shenqiu sag reveals that oil and gas produced from Lower Cretaceous and Eogene are oils of mixed origin sourced from Lower Cretaceous and Mid -Lower Jurassic. It is proved that Mid - Lower Jurassic is one of the effective hydrocarbon - supplying strata series in the study area. Thus the Mid - Lower Jurassic coal measure strata are effective source rocks. Hydrocarbon potentials of Mid - Lower Jurassic in Tanzhuang - Shenq-iu sag are also evaluated based on analysis of source rock characteristics.