Table 11.6. Qualitative comparison of thickness, original total organic carbon (TOCo), and original hydrogen index (HIo) of the Antelope shale, Kreyenhagen Formation, and Moreno Formation source rocks in local depocenters within the San Joaquin Basin Province.

Source Rock	Depocenter	Thickness, ft	TOCo, wt. percent	HIo, mg HC/g TOC	
Antelope shale unit
(>12,000 ft., >3,660 m)	Tejon	3,000-4,000 (914-1,219 m)	2.0-5.5
[3.5-5.5]†	300-400	
	Southern Buttonwillow 	500-1,000
(152-305 m)	3.5-4.5	300-400	
	Northern Buttonwillow	500-1,000
(152-305 m)	1.0-2.0	200-350	
	
Kreyenhagen Formation
(>15,000 ft., >4,572 m)	Tejon	0-400
(0-122 m)	1.0-2.0	100-250	
	Southern Buttonwillow 	400-800
(122-244 m)	2.0-3.0	150-250	
	Northern Buttonwillow	400-800
(122-244 m)	2.0-3.0	300-450	
	
Moreno Formation
(>13,500 ft., >4,115 m)	Jacalitos Field area	500-700
(152-213 m)	3.5-4.0	300-350	

†Original total organic carbon (and possibly also original hydrogen index) for Antelope shale near the Tejon depocenter may require revision to higher values (in brackets) because the sampled intervals in three control wells only penetrate the upper few hundred meters of source rock and may not be representative of deeper Antelope shale. The bracketed values are the result of interpolation of data remaining after exclusion of these three wells from figure 11.11: Paloma 81X-3, Channel 38X-6, and Tenneco 27X-26 (map number 78, 83, and 84 respectively in fig. 11.3 and table 11.7).