Sand-mudstone modeling of fluvial fan sedimentary facies: a case study of Shanxi Formation reservoir in Ordos Basin

Abstract The sand bodies formed by braided fluvial fan deposits have a certain distinctiveness. They not only the characteristics of facies sandbodies but also follow distribution law alluvial bodies. variation that are present along and perpendicular to channel is relatively complex. Therefore, constraints in modeling process sand–mudstone this type reservoir essential. This study selects second member Shanxi Formation middle Ordos Basin perform modeling. First, studying lithology sedimentary structure area, body river analyzed. Then, original data points analyzed, function with high convergence obtained, sand–mud model under constraint established using random method. Finally, accuracy tested via single-well thinning, multi-well seed similarity. test results confirm mudstone highly similar actual stratum. And it conforms fan. method reliable, can be used predict areas low well pattern density.