Rock type identification method and device for ultra-deep sea underground oil and gas exploration

The embodiment of the invention provides a rock type identification method and device for ultra-deep sea underground oil and gas exploration. The method comprises the steps that uranium removal gammalogging data and density logging data of a target layer section located in an ultra-deep sea underground area are acquired; according to the values corresponding to the uranium removal gamma logging data and the density logging data, a quadrant area where the target layer section is located is determined in a target plane cross plot, and the target plane cross plot is a plane cross plot between uranium removal gamma and density; the quadrant areas are divided in advance according to a first division threshold value corresponding to uranium removal gamma logging data and a second division threshold value corresponding to density logging data; and based on a preset identification rule, the corresponding rock type is determined according to the quadrant area where the target interval is located. According to the meth