Classification method of shale gas analytic stages and its application

Abstract

Article highlights 1. According to the inflection point of the curvature of shale desorption efficiency curve, the curvature curve can be divided into four stages: sensitive desorption, rapid desorption, slow desorption and inefficient desorption. 2. The Upper Paleozoic shale in Yulin area of Ordos Basin is mainly in the stage of inefficient desorption and slow desorption. 3. When shale gas is open, according to the desorption stage and pressure node of shale exploitation, the formation pressure can be properly reduced to improve shale gas recovery.

Keywords

• Shale gas
• Isotherm adsorption
• Desorption efficiency
• Desorption efficiency curve curvature
• Desorption stage