Geological Modeling On Complex Reservoir And Validation

Sand developed in the underwater distributary channel with the delta front in 78-54 blocks of PI oil group in Northern Putaohua Oilfield, the sand narrow and thin , caused low control of well, the delta front rate only 30%-40% in a single layer.Narrow thin sandstone reservoirs are difficult to predicted with current geophysical technology and development well. So thesis carried out detailed reservoir geological modeling.Basing on fine 3D seismic interpretation and using the method of well-log and seismic data, the paper characterize detailedly geometry shape and spatial distribution of the narrow and small sandstone reservoir, and distribution feature of various attribute parameter in internal reservoir in order to set up high-precision reservoir geological model. The goals of the study is to obtain high model precision and the least uncertainty.In this thesis, based on stochastic realization,lithofacies probability model was developed,and facies model under different probability achieved from cut-off value. The sedimentary units with minimun error were elected through statistical analysis of the various models. Finally, the best simulation was achieved. The vacuated well test showed that the average compliance rate of sand prediction is 80% in the best simulation, which could distinguish 0.2m sand thickness. The results achieved the requirements of fine modeling,which accurately predicted the narrow-thin sand。Reservoir property Geo-modeling process is constrained by the distribution of sedimentary facies in plane and vertical evolution from the genetic aspect of formation and evolution of sedimentary, which using multi-parameter coordination and hierarchical constraint approach.In the model validation aspect, the model is verified from all angles such as the probablity of consistency test,the vacuated well test and dynamic stata validation Finally optimize the most realistic gelogical simulation realization.Research shows that combined reservoir gelogical modeling is a practical way to resolve the prediction for the sandbody's development situation between wells in narrow-thin sandstone reservoirs, which is vital to remaining oil producing in the old oilfield and enhanced oil recovery.