Evaluation of Favorable Shale Gas Intervals in Dawuba Formation of Ziyun Area, South Qian Depression

Table 1

The maceral composition of all the Dawuba Formation shale samples.

Sample ID	Depth/m	Member	Lithology	Sapropelinite %	Exinite %				Vitrinite %	Inertinite %	Types classification
					Resinite	Homocollinite	Alginite	Sum	Normal vitrinite	Fusinite	Index	Type
CY1-1	751	Fourth	Black shale	0	—	59	28	87	10	3	33	II2
DY1-5	450	Fourth	Black shale	0	2	63	20	85	13	2	30.8	II2
MC-1	2750	Fourth	Black shale	0	—	63	22	85	12	3	30.5	II2
ZY1-1	2668	Fourth	Black shale	0	2	67	13	82	14	4	26.5	II2
ZY1-3	2688	Fourth	Black shale	0	4	56	18	78	17	5	21.3	II2
ZY1-4	2759	Fourth	Black shale	0	3	56	17	76	16	8	18	II2
ZY1-9	2738	Fourth	Black shale	0	—	64	17	81	16	3	25.5	II2
GTH-1	Outcrop	Third	Black shale	0	5	47	24	76	18	6	18.5	II2
LG-1	Outcrop	Third	Black shale	0	—	58	26	84	11	5	28.8	II2
ZY1-2	2806.50	Third	Black shale	0	—	72	13	85	11	4	30.3	II2
ZY1-6	2796	Third	Black shale	0	0	74	12	86	13	1	32.3	II2
ZY1-7	2802.60	Third	Black shale	0	—	73	11	84	14	2	29.5	II2
ZY1-8	2812.5	Third	Black shale	0	—	64	15	79	16	5	22.5	II2
GTH-2	Outcrop	Second	Black shale	0	0	55	26	81	16	3	31.8	II2
LG-2	Outcrop	Second	Black shale	0	1	53	29	83	14	3	31.8	II2
ZY1-10	2857	Second	Black shale	0	0	54	28	82	15	3	31.8	II2
ZY1-12	2858	Second	Black shale	0	4	53	29	86	11	3	31.8	II2
ZY1-13	2858.5	Second	Black shale	0	0	50	28	78	17	5	31.8	II2
CY1-2	880	First	Black shale	0	4	57	14	75	17	8	16.8	II2
CY1-3	881	First	Black shale	0	4	59	8	71	22	7	12	II2
DY1-1	633	First	Black shale	0	0	62	22	84	12	4	29	II2
DY1-2	634	First	Black shale	0	—	74	16	90	8	2	37	II2
KH-1	Outcrop	First	Black shale	0	—	69	16	85	11	4	30.3	II2
SDZ-1	Outcrop	First	Black shale	0	0	75	12	87	11	2	33.3	II2
SDZ-2	Outcrop	First	Black shale	0	—	80	12	92	6	2	39.5	II2
ZY1-14	2871	First	Black shale	0	—	65	20	85	12	3	30.5	II2
ZY1-15	2877.40	First	Black shale	0	—	63	19	82	14	4	26.5	II2
ZY1-16	2931.95	First	Black shale	0	5	61	14	80	15	5	23.8	II2
ZY1-17	2882.50	First	Black shale	0	—	76	16	92	5	3	39.3	II2