The Study On Hydrocarbon Accumulation Rule Of Shen'nan Tectonic Belt By Controling Of Structural Characteristics

The Shen'nan tectonic belt is located in the deep county of Hebei province.The structure is located in the southern part of Shenxian sag,Jilin depression,Southeast of Shenxian depression,Shennan Ulco tectonic belt.Because of the complicated geological conditions,the structure is broken,the fault is many,the fault block is small,and the lateral variation of the reservoir is fast and the heterogeneity is serious,which brings some difficulty to the rolling development of the oil fieldIn this study,the Dongying formation and Shahe Street Group are divided by well seismic combination,and the maximum entropy spectrum analysis technique is used to carry out high resolution sequence stratigraphy.Tlie oil formation is divided into the Sanya section of Dongying formation and the one subsection of the Shahe Street Group in the key oil-bearing strata of the study area.Finally,the stratigraphic correlation and stratigraphic correlation in Shennan area will lay a foundation for further detailed interpretation of structure and study of hydrocarbon accumulation.On the basis of stratigraphic division and comparison the interpretation of seismic fine structure is carried out.Through the re interpretation and analysis of the structure of the study area,the main trap types and favorable trap traps are found in the deep South tectonic zone.Because the research area has many oil-bearing strata,such as the Neogene Guantao formation the Paleogene Dongying formation and the Shahe Street formation,the focus is on the key points.The key oil layers are interpreted by fine structure,well mapping and well location map,and potential for reservoir forming is analyzed.At the same time,through the re interpretation and analysis of regional structure,the fracture structure and fault combination of the deep South tectonic belt are summed up,the plane and section structure characteristics of the deep South structural belt are analyzed,and the control effect of the fault system on the oil and gas of the deep South structural belt is also analyzed.The mechanism of reservoir formation in Shennan structural belt is analyzed,and the rule of hydrocarbon enrichment in Shennan oilfield is summarized.The study shows that the structural features of the Shennan tectonic belt play an important role in the occurrence of oil and gas.There is a new understanding of the hydrocarbon accumulation horizon,the way of migration and the existing fault blocks in the Shennan tectonic belt.As an old oiffield developed for nearly 30 years in Shennan oilfield,finding new potential reservoirs on the basis of existing reservoirs is the key point of the next step Therefore,the potential analysis of the trap of the deep South anticline wing is carried out in the study of oil and gas accumulation.Combined with the study of oil and gas enrichment law,a new oil bearing block is found in the wing of the deep South anticline,which provides a basis for potential potential and prediction in the late potential area.