Study On The Geological Characteristics In Fine Development Stage Of Yong 3-1 Block

Selecting Yong3-1 block in Yonganzhen Oilfield in central uplift belt of Dongying Sag in Bohai Bay Basin as the study area,aimed at the complex geological body,which is complex,strong heterogeneous,has small fault blocks,many oil layers,complex oil and water relationship.Based on the fine research on sedimentary,structure,reservoir characteristics of the study area,combined with the problems in development process,establishing reservoir geological model,in order to do qualitative and quantitative description of reservoir,provide geological evidence for later adjustment of development program and tapping of the remaining oil.Integrating application of seismic,well logging,mud logging,core data,and using sequence stratigraphy theory,studied the stratigraphic correlation and classification in the study area,established fine stratigraphic framework,identified the accurate phenomenon of small layer pinchout and broken,and accurately compared fault throw of small breakpoint between 3-5 m;Combined with the high resolution seismic data,researched on analysis and interpretation of fracture system,formed the fault description combination technology for low level fault under five,and under the guidance of tectonic stress field simulation results,using the actual development rule of the tectonic pattern identified the fault development characteristics and established the special combination method of complex fracture system.Based on the conclusions above,studied the sedimentary facies characteristics and established the sedimentary microfacies model;Delta "sand,ash,mud" three-component comparison model is built,further verified the accuracy of tectonic interpretation.Macro parameters of reservoir distribution,microscopic characteristics and heterogeneity characteristics are studied;Geological modeling method of complex fracture system is built,and summarizes the reservoir space distribution on the basis of reservoir distribution model and the model of reservoir heterogeneity.After the fine reservoir description,by means of comprehensive evaluation,pressure coring well data with geological analysis,dynamic development monitoring,reservoir engineering analysis,reservoir numerical simulation,from the aspects of the sedimentary characteristics(including positive and reverse rhythm),geological characteristics,reservoir physical property,reservoir thickness,dip,oil-bearing belt and natural energy),development characteristics(pattern forms,surface property change),which influenced the remaining oil distribution,researched on the water displacement and residual oil distribution law.Through the verification of follow-up drilling of new well,proved the accuracy of remaining oil analysis,and the reliability of good results.