Sedimentary Microfacies And Potential Analysis Of Nantun Formation In The T Oilfield

T oilfield has spent nearly 30 years development,according to the distribution of single sand body origin,define the extension,encryption well pattern adjustment Wells in the area potential parts present oilfield is an urgent need to solve the key problems,on the basis of well logging,core and 3D high-resolution seismic reflection data,study T oilfield area A,B,C,D,E five block south tuen river delta sedimentary system in group,Identify the logo layer,through the two vertical and two horizontal main profile control,set up in the south tuen set of480 Wells of high resolution sequence stratigraphy framework,reveals the south tuen group "thinning near south hunger" superimposed stratum model,the Nantun Formation is divided into one long-term base level cycle,four medium-term base level cycles,and 28 short-term base level cycles,drew the 403 Wells 28 short-term base level cycle development zone sedimentary microfacies,and the single well,the well and the plane sedimentary facies analysis The results show that the geological structure of this area is complex,and the faults are developed.The strata of Nantun Formation is a long-axis distal(northwest source)"shallow water delta" sedimentary system,and the microfacies types include underwater distributary channel,mouth bar,sheet sand,distal sand bar,etc.Under the guidance of the fluvial delta front depositional model,which are developed as "shallow curved channel" and become thin,narrow,and multi-branched toward the basin.The two slow retreat and sharp progressive cycles controlled the source-reservoir-cap-isolation combination,making the SSC1-14 short-term datum cycle the most favorable oil-bearing combination.To reunderstanding fault block oil reservoir geological characteristics,reveals the influence law of reservoir development and oil production speed and so on the key geological factors: E block south section for lithologic structure type of layered edge water reservoir oil-water system,C block south a II oil group for stratigraphic overlap type layered edge water reservoir oil-water system,The effective thickness is controlled by provenance and ancient lakeshore and develops in the east.It is predicted that there will be 1 remaining oil enrichment area outside the development zone and 3 horizontal Wells are recommended.The second member of fault block B is a lithologic structural layered reservoir with multiple oil-water system and edge water.The effective thickness is controlled by both tectonics and sedimentation,and is distributed as a strip along the channel.1 remaining oil enrichment area is predicted and 3 horizontal Wells are recommended.