A New Evaluation Method for the Fracability of a Shale Reservoir Based on the Structural Properties

Table 2

Angle intervals and ratings of the factor for each interval [38].

Angle interval (between joint and borehole)		Chosen rating of the factor for RQD	Chosen rating of the factor for RQDI
>60°	<1.16	1	1.5
30°-60°	1.16-1.99	1.5	3.5
15°-30°	2-3.86	3.5	5.5
<15°	>3.86	6	7.5