Research On Reservoir Prediction Of Fuyang Oil Reservoir In Wangjiatun Area

According to the characteristic of fine lithology,thin thickness,low sand ratio in Wangjiatun gas field Fu Yang reservoir. The ideas, methods and techniques of effective seismic geology prediction is presented in order to understand the distribution characteristics of sandbodies in Wangjiatun and guide the development of oil and gas.Combined with the data of seismic, well logging, oil, as well as core and so on, according to the principle of high resolution sequence stratigraphy, this paper establish Fu Yang formation sequence stratigraphic trellis frame in Wangjiatun gas field.On the basis of the previous three order sequence classification,the purpose layer is divided into 6 reservoirs, 13 sand groups and 35 small layers.Based on the theory of sedimentology,using core observation and logging data of study in Wangjiatun gas field,study on the development of sedimentary facies, sedimentary facies and sedimentary evolution.Research shows that: the area in the meandering river and shallow lacustrine delta sedimentary system characteristics.It can identify 3 kinds of facies, 6kinds of facies, kinds of facies, and the other 25 phases, such as the deposition of river bed retention, the edge of the beach, the lower flow channel, the former delta mud and so on.The sedimentary model is fluvial facies to delta front facies transition.Based on the description of sequence and sedimentary geological features,this paper carried out the in Wangjiatun area of fine structural interpretation of seismic.In the process of interpretation, the recognition of small faults is emphasized.Mapping structures draw with variable speed mapping method.Structure characteristics of the study area shows that the structure in Wangjiatun gas field with North and south block characteristics, South Block for Shengping nose structure, North Block in Wangjiatun structure.Most of the fault in NNE and NNW distribution.According to the difficulties of the thin sand body and the wave impedance of the sand and mudstone in the study area,we use the logging curve reconstruction technique in this paper.The distribution characteristics of sand bodies were characterized by the combination of the sparse pulse wave impedance inversion and the geological statistics.On this basis,predict the porosity and permeability of reservoir by using the method of sequential Gauss parity simulation.The results show that the inversion results can effectively identify the sand bodies above 2m;In the plane distribution law,the formation of the Fuyu oil layer is mainly based on the development of the points,strips of a short axis,locally distributed;the formation of the Yangdachengzi oil laye is mainly based on zonal and patchy distribution,local point sheet distribution.Porosity value of Fu Yang oil reservoir is mainly distributed in 14%~16%.A few high values are distributed between 18%~26%.Permeability is mostly distributed in 1m D,some of the high value of up to 10 m D.