Study On Geological Model Of Triassic ? Group Oil Reservoir In Second Area LN Oilfield

LN oil field is located in the Lunnan buried hill drape anticline belt of the middle of the Lunnan slope in Tabei uplift.The main oil-bearing layers in the 2 well area of the LN oilfield are the Triassic and Jurassic,and the Triassic I oil group is the main development stratigraphy.At present,the comperhensive mistrue content during the development of LN oil field is relatively high,the stable production situation is grim,the reservoir heterogeneity is strong,and the work of the three-dimensional geological model has not carried out,which seriously restricts the further development of the reservoir.In this paper,based on the characteristics of the reservoir,the stratigraphic subdivision and sedimentary microfacies are divided into the logging,logging,drilling,test oil,core analysis data and seismic data.Interpretation model and three-dimensional reservoir geological model,and the different methods are used to verify the model.Mainly achieved the following aspects of the results and awareness:(1)The boundary layer of the Triassic I oil group in the 2 wells area of the LN oilfield is divided into two sub-sections of TI2 and TI3.The TI2 sand layer is divided into two small layers: TI21 and TI22.The TI3 sand layer is divided into TI31,TI32 and TI33,TI34 and TI35 small layer,a total of 7 small layers.(2)The Triassic I oil group belongs to the delta front sediments,analyzes the sedimentary source direction,establishes different sedimentary microfacies models,divides the sedimentary microfacies into underwater distributary channel,river wing,sand dam And the diversion bay,we also studied the vertical and planar distribution characteristics of the sedimentary microfacies are studied.(3)The relationship between reservoir physical properties,electrical properties,lithology and oil content was analyzed.On the basis of this,we established the model of porosity,permeability,oil saturation and mud content logging is established.(4)The 2 wells area was divided into mudstone sandwich,physical sandwich and calcium sandwich.In the profile,T12 sandwich is less,and has better physical properties;T13 is mezzanine,but is distribution is not stable.According to different characteristics the sand bodies in this well area are divided into the eastern and wsetern parts.The thickness of the sandbody is unstable in the west,large in the north is large,and small in the south,the thick sand body is superimposed vertically,sand body in east is thick and the distribution is continuous and stable.(5)The reservoir geological model is established by combining the two methods,including the three-dimensional structure model,the three-dimensional deposition model and the reservoir attribute model of the lithofacies constraint.And compared with the physical parameters and geological reserves that is obtained by the model and the proven geological reserves has proved that the model was in good agreement with the actual geological condition.