Royale Energy Inc. announced that it has commenced drilling the first well under its joint venture agreement covering the Rio Vista Field in the Sacramento Basin. The field has produced over 3.5 TCF of natural gas. Using 3-D seismic, Royale and its partners have identified several prospective locations in the Martinez and Capay formations. The Royale CRC 8-1 will target the Martinez sand at a depth of approximately 6,000'. Royale expects to reach total depth by mid-September 2016.