Reservoir Forming Conditions Of Stratigraphic Oil Pool In Palaeogene In Jiyang Depression

Based on the strata,structure,sedimentary and many other basic research data analysis of Changdi area, combinating with seismic data, drilling data, logging data and analysis of test data,researching the stratigraphic reservoir accumulation conditions in this area.After compared with 12 Wells of sterane and terpane biomarkers compound map,considering the 70% oil and gas of Paleogene of Changdi area come from Shasan and Shasi Segment of Gubei Depression,the 30% come from Shasan and Shayi Segment of Huanghekou Depression.Based on the section form,combination style, plane combination form and the analysis of fault activity of the main fault in this area,thinking the changdi fault can effective connected hydrocarbon source rocks and reservoir sand body.It is an important channel to migrate oil anf gas from Gubei Depression to Changdi Bulge. After analysis the sandstone thickness statistics,lithofacies and physical properties of this atea, sand body of Shaer and Shasan segment widely distribute,porosity and permeability is good,can be used as an impotant lateral channel to imagrate oil and gas. Through the contact relations and microstructure research of unconformity surface,the bottom of the Shayi segment and the top of the mesozoic unconformity surface can be used as an available channel. Skeleton fault, sand body and unconformity combined the Fault,-sand body,fault-unconformity and faultsand body-unconformity composite oil and gas transportation systems. Based on the strata, sedimentary facies research, existing three assemblages in this area Througing describe onlap and denudation lines of stratigraphic carefully, acpuiring valued stratigraphic trap distribution range. Sealing of roof and floor are important factors to controy the availability of Stratigraphic trap.Based on the research of Trap distribution, sealing of roof and floor, reservoir development,optimizing the favorable trap development zone.