Reservoir Prediction Of P? Layer Group In Ao A Block Of Ao Nan Oilfield

The reservoir of Ao A block has a problem with unstable distribution,fast horizontal change,single well drilling in thin sand and the development risk.This paper puts forward the comprehensive prediction of the effective reservoir of ideas and methods,strengthen the understanding of the reservoir distribution,to provide suggestions for horizontal wells in the next step.This paper combined with the seismic data,logging,and geological information,On the basis of sparse pulse impedance inversion,the spatial distribution of thin interbedded sand bodies in the study area is carefully described by spectral decomposition technique.The research shows that:small sandstone is developed in P11,P12,P32,P42 of Ao A block,vertical stacking contiguous,and the thickness of the northern is thick than southern,the most thickness of northern sandstone is 9 meters,the most thickness of southern sandstone is 2 meters.The B3620098 wells and M1705250 well region are two low value area,the distribution of sandstone thickness is 1-2 meters.On this basis,using Petrel software to optimize the five modeling methods,the model using optimized modeling method can reflect the underground geological features of spatial distribution,that is sequential indication plus phase control plus seismic cooperative simulation method,so as to establish the lithologic model and attribute model of reservoirs in the study area.The study shows that the porosity of P11,P12,P32,P42,of the Ao A block sand body developed is in 14%-18%,permeability is in 22×10^-3?m-63×10^-3?m²,the high value area has a better correlation with the same layer of sandstone development zone,it provides the basis for the design of the horizontal well.Combined with wave impedance inversion and three-dimensional geological modeling research achievements,draw the comprehensive evaluation map of Ao A block,based on the evaluation of horizontal well potential area,The vertical well with a deep resistance value greater than 7 ?·m and a gamma value less than 90API is chosen.The sand body distribution width is greater than 900m,and the sand body scale reserves are greater than 2.8×10⁴t,and the sand body thickness is greater than 0.6 meters in the main facies zone,to design five horizontal Wells.