Fine Tectonic Interpretation Of Ng3-4 In Bo21 Of Gudao Oil Field

Until now Gudao Field Block 21 has used water injection,polymer injection and thermal recovery three development mode after nearly half a century of development,in which the subject area is polymer injecting currently,polymer injection zone composite water cut is currently 87.6%,well Control surplus reserves 32,000 tons,the remaining oil saturation of wells are in more than 50%,with the remaining oil potential;block edge has a complex reservoir and oil-water relationship,the reservoir is not implemented,southern new well 5X20 found new reservoir,north of raw sand body pinchout area near the new wells drilled effect is good,peripheral unit storage layer distribution and structural characteristics still need to deepen the research.To ensure stable oil demand and tapping the potential of remaining oil,to put a large number remaining oil development practical experience at home and abroad as guidance,through fine stratigraphic division and correlation,building the segmentation layer frame,and accordingly carry out fine structural interpretation and edge of reservoir prediction,the Bo21 fault block edge oil-water distribution,the focus is to reveal the Bo21 fault Guantao formation 3,Guantao formation 4 sand sets of faults distribution characteristics and reservoir distribution and analysis of injection polymer micro structure and remaining oil,tapping the potential of old oil fields production provides the geological basis.Research shows that:the area mainly develops meandering river facies,the study area develops comparatively typical and a wide range of standard layer,to ensure the accuracy of the results of stratigraphic correlation.The Guantao formation is the main area of sand with the large thickness and wide distribution,and has become the advantage of sands.The edge of the no well area is the focus of reservoir prediction to the main single sand body Ng3-3,Ng3-4 and Ng3-5,and wave impedance inversion prediction is more accuracy in seismic attribute prediction.Combined with reservoir fine structure research and storage reservoir prediction result,imply the edge of the oil-water boundary of major reservoirs and found area is mainly with positive micro structure.And near the positive micro structure,remaining geological reserves and remaining oil saturation were better in negative micro structure.