The series property XAxisKey and YAxisKey will match up to the axes with the corresponding Key.

  fluidSeries.YAxisKey = "Cubic meters per day";
  oilSeries.YAxisKey = "Cubic meters per day";
  waterSeries.YAxisKey = "Cubic meters per day";
  yaxis1.Key = "Cubic meters per day";
  TotalGasSeries.YAxisKey = "Cubic K-meters";
  GasRateSeries.YAxisKey = "Cubic K-meters";
  yaxis2.Key = "Cubic K-meters";