Paleoenvironment, Geochemistry, and Pore Characteristics of the Postmature to Overmature Organic-Rich Devonian Shales in Guizhong Depression, Southwestern China

Table 2

Kerogen microscopic composition and determined kerogen type index.

Depth (m)	Formation	Sapropelinite (%)		Exinite (%)	Vitrinite (%)	Inertinite (%)	TI	Type
		Amorphous solid	Alginite	Benthic algae
231		56	18	26	-	-	87	I
255		58	17	25	-	-	87.5	I
475		63	15	22	-	-	89	I
495		64	18	18	-	-	91	I
579		65	14	21	-	-	89.5	I
595		62	14	24	-	-	88	I
639		67	15	18	-	-	91	I
651		62	13	25	-	-	87.5	I
739		65	15	20	-	-	90	I
795		70	14	16	-	-	92	I

Note: , where is the kerogen type index, is the sapropelinite (%), is the resinite (%), is the cutinite, suberinite, sporinite, amorphous solid, and benthic algae (%), is the perhydrous vitrinite (%), is the normal vitrinite (%), and is the fusinite (%).