Discussion on several key problems in shale gas reservoir modeling based on horizontal wells
The 3D geological modeling of shale reservoirs is different from geological modeling of conventional reservoirs.There are some related technical problems,such as issues pertaining to(1)structure reconstruction and fine modeling based on bedded horizontal wells,(2)integrated modeling of multiple shale parameters based on horizontal well data,and(3)comprehensively characterizing and modeling natural fractures at different scales.This paper proposes some solutions to these key problems.Aimed at the problem of fine structure modeling based on bedding horizontal wells,a method consisting of cyclically constructing layers constrained by horizontal well layering data is proposed.For shale property modeling based on horizontal wells,a facies-controlled and multi-property-constrained modeling strategy is proposed.Due to the statistical errors caused by horizontal well data sampling,two ways those use high-precision layering the horizontal section of horizontal wells and enlarge modeling grid to decluster the density of the data scaled up from the horizontal wells were adopted.Fractal simulation technology was recommended for the characterization of natural fractures at different scales in shale,and we suggested using virtual wells and virtual stratifications to solve the problem of updating steering models in drilling.The above methods were verified using data from the Weiyuan gas field,and we showed that the model accuracy and reliability were greatly improved relative to other methods.The technical methods presented in this work can be popularized in the geological modeling of shale gas reservoirs.
万方数据
维普
