Research Of Sedimental Characteristics Of The Guantao Formation Of The Neogene On Liubei Block Of Raoyang Sag,Central Hebei Province

This article selects the Guantao Formation of the Neogene on Liubei block of Raoyang Sag,Central Hebei Province as research object.Using sedimentology,petroleum geology and sequence stratigraphy as the theory instruction,combined with regional geological background,core,rock slice,seismic,logging and testing data,the neogene guantao sedimentary characteristics in the study area have been studied in detail and geted to know basically the following several aspects:（1）The using of high resolution sequence stratigraphy research methods,combined with the comprehensive analysis of the drilling,logging and seismic data,identify the different classes of neogene guantao base level cycle and interface characteristics of top,bottom,through long-term peace even well profile surface of contrastive analysis of the cycle,will fine guantao formation is divided into three mid cycle（NgⅠ,NgⅡ,NgⅢ）and seven short-term cycle(Ng^1-1,Ng^1-2,Ng^2-1,Ng^2-2,Ng^3-1,Ng^3-2,Ng^3-3).（2）Through the sedimentary marks and even well profile phase analysis,we think the block developed mainly two kinds of types of sedimentary facies.Shown on the longitudinal,guantao bottom braided river sedimentary,according to the characters of profile structure,it is divided into the river and flood sedimentary subfacies,guantao formation servedⅢ,upper guantao formation servedⅡ,guantao formation servedⅠgenerally,meandering river sedimentary subfacies types is given priority to with river bed and bank and river flood,is further divided into the riverbed detainment sedimentation,point bar,natural levee,crevasse splay,alluvial flat sedimentary microfacies,and study its characteristics and time-space distribution in detail,and its depositional model is established.（3）Based on the study of regional structure and sedimentary background,through the distribution characteristics of sand body,thinks that the sedimentary period,terrigenous clastic sediments mainly comes from three north north east,west and southwest direction,which the north north east to provenance has close relationship with the deposit in the study area.（4）The reservoir study in the study area shows that the destructive diagenesis is given priority to with the compaction and cementation,compaction performance of rigid particle in fracture,plastic particles will be squeezed bending deformation occurs,and change the contact relationship between particles,etc.Cementation is given priority to with early carbonate cementation,siliceous cementation and clay mineral cement and iron cementation is relatively weak.Constructive diagenesis mainly includes metasomatism and dissolution,etc.（5）The study area for the block of clastic reservoir in the main pore types are primary pore,intergranular dissolved pore,intragranular dissolved pore,mold hole,grain of joint and fissure.Commonly secondary porosity.With the primary pore formed guantao clastic rock reservoir space,they combined with the thin section of casting the microscopic observation,physical characteristics and characteristics of capillary pressure curve analysis.（6）Based on the physical properties of the samples of more than 70 Wells in the study area of statistical research,inductive analysis of guantao formation servedⅠand guantao formation servedⅡbasic reservoir is given priority to with hole in the permeability of reservoir.Of great value of oil and gas storag,the the Guantao Formation servedⅢis given priority to with high hole high permeability reservoir.