A New Methodology for the Multilayer Tight Oil Reservoir Water Injection Efficiency Evaluation and Real-Time Optimization

Table 3

Tracer test results of the T6 well group.

Injector	Tracer type & inject date	Tracer well	Tracer breakthrough date	Tracer breakthrough time (day)	Tracer peak concentration (ng/ml)	Duration (day)
T6	Gd 3/20/2019	P8	5/9/2019	50	52.4	30
		P7	5/17/2019	58	97.01	26
	Sm 3/15/2019	P8	4/25/2019	41	82.41	21