Study On Sedimentary Microfacies Of The Third Member Of Shahejie Formation To The First Member Of Dongying Formation In Maozhou Strctural Belt

After nearly three decades of oil and gas exploration and development,the simple structure,and the shallow traps have been drilled.The amount of surplus resources in the state structure is large.The comprehensive analysis shows that lithologic oil and gas reservoirs are an important research direction for the next exploration and development of the oil field.The exploration of lithologic reservoirs is based on the lithology boundary depth,and the characterization of lithologic boundary needs to study the sedimentary microfacies in depth.Based on the theory of continental sequence stratigraphy,this paper comprehensively utilizes the data of earthquake,logging curve and logging to absorb and analyze the different types and levels of the sequence interface,and the system interface And quasi-sequence(group)interface.The stratigraphic section of the third member of the Shahejie Formation in the Paleogene of the Huzhou area is divided into two secondary sequences,eight third-order sequences,20 quadratic sequences and 31 quasi-sequences(groups).Then,the sequence stratigraphy of the Paleogene in the study area was established by selecting the seismic section of the well and the study of the wellbore.Based on the single-well identification mark,the key development blocks are studied at high level and high-order sequence stratigraphy,and the sequence structure,analysis structure and sequence are studied.,The matching relationship of deposition.In the framework of sequence stratigraphy,further study of sedimentary microfacies.Based on the study of the lithology,the lithology,grain size,sedimentary structure,sedimentary structure,vertical sequence and geophysics,paleontological fossils and trace fossils are studied.According to the study of single well sedimentary facies,logging and seismic facies Based on the analysis results,three types of sedimentary facies,seven sedimentary subfacies and 17 sedimentary microfacies were divided into three sedimentary facies of Shahejie Formation and Shahejie Formation in Huzhou area.Among them,the Dongying Formation is mainly the meandering river sedimentary system,and the Shahejie Formation is mainly composed of the delta sedimentary system.On this basis,the typical characteristics of different sedimentary microfacies of the main oil layers are analyzed,and the vertical To the phase sequence and its evolution.Finally,the favorable stratigraphic lithologic reservoirs are forecasted in the key areas of key areas in the study area.