Combination of Methyl from Methane Early Cracking: A Possible Mechanism for Carbon Isotopic Reversal of Overmature Natural Gas

Table 1

Mass of mixture gas sealed in tube for different temperature experiments.

Temperature (°C)	Weight (mg)
	Tube	Tube+gas	Sealed gas
425	8135.6	8140.1	4.5
450	8031.3	8035.8	4.5
475	8346.2	8350.6	4.4
500	8546.8	8551.3	4.5
525	8327.1	8331.6	4.5
550	8491.3	8496.0	4.7
575	8328.0	8332.4	4.4
600	8348.4	8352.9	4.5
625	8465.4	8469.9	4.5
650	8312.4	8317.0	4.6
675	8657.4	8661.6	4.2
700	8340.9	8345.2	4.3
725	8973.5	8977.9	4.4
750	8368.1	8372.6	4.5
775	7990.3	7994.6	4.3
800	8684.3	8688.4	4.1