The Sequence Stratigraphy And Sedimentary System Of The Upper Forth Sub-member Of Sha Hejie Formation In Zhuangxi Shoal Area

Gu Bei area is located in the middle of the Zhanhua sag in Jiyang depression,in which Shahejie formation is the main formation of oil and gas accumulation. This paper through the comprehensive research of seismic, logging, well logging data, established the sequence stratigraphic framework of Es4 u of research area. And within the framework, through the analysis of sedimentary characteristics, core,well logging, mud logging, granularity, such as data, the whole the sedimentary system distribution and evolution of Es4 u was study systemic. On this basis, the sedimentary characteristics and distribution range were discussed.Divideed sequence interface of key bed of seismic section by using the method of high-resolution sequence stratigraphy,and combining with drilling profile, seismic and log data, lacustrinehigh-frequency within sequence. Es4 u was divided into 5 middle-term base level cycles. Transverse contrast of interwells has been made.And determine the overlap line and denudation line. Isochronous contrast framework has been established ultimately. The Gubei Formation is inland fluvial facies in the study area and the tectonic movement, topography, paleo-climate are the main controlling factors of the formation and evolution of the sequence. Tectonic movement main control long-term base level cycle, climate and provenance directly affect long-term and medium-term base level cycle.Though examine cores and photos,using the core rock type, lithofacies combination, grain size, palaeontology, such as characteristics, according well log data to analyze sedimentary facies,I have constructed sedimentary facies types of not coring interval. Clear the variation of evolution of vertical and lateral of sedimentary facies types,from sub-sag edges to slop to internal- sub-sag to sub-sag edges. Determine the work area of sedimentary facies include delta facies, fan-delta facies, lacustrine facies and turbidite fan, etc. Controlled by the factors such as tectonic movement, topography, steep slope zone fan delta and turbidite fan, delta in gentle slope belt development.On the basis of above research, sand body distribution was studied. Based on the seismic and logging data divided different sand body from formation causes,and fine carved all kinds of sand body distribution. Confirm main control factor of all kinds of sand body,by contrating its mode of action. Theoretical guidance for the next step of exploration work in the oil field can be provided.