Migration and Release Mechanism of Methane Microseepage Based on Dawanqi Field Work and Physical Simulations

Table 1

CH₄ microseepage fluxes and release types of some sampling points in the Dawanqi oilfield.

Site	Flux (mg·m^-2·d^-1)	Release types	Location
545-12	69.2	Continuous release	Fault
555-16	329.9		Fault
546-20	1.58	Episodic release	Fault
552-10	1.12		Oil-gas area
543-28-5	0.1		Fault
557-9	1.14		Oil-gas area
553-9	12.53	Flat release	Oil-gas area
559-8	0.76		Fault
Control site	0.24	—	—