Evaluation of the Accumulation Conditions and Favorable Areas of Shale Gas in the Upper Palaeozoic Marine-Continental Transitional Facies in the Daning-Jixian Area, Ordos Basin

Table 1

Comparison of five shale gas basins in the United States and two in the southeastern Ordos Basin.

Parameters	Weight coefficient	Barnett		Antrim		Ohio		New Albany		Lewis		Shanxi formation		Taiyuan formation
		Features	Score	Features	Score	Features	Score	Features	Score	Features	Score	Features	Score	Features	Score
TOC (%)	0.25	4.5	80	0.3-24	92	0-4.7	66	1-25	86	0.45-2.5	45	0.51-29.15	46.2	0.011-22.52	50.6
Ro (%)	0.15	1.0-1.3	78	0.4-0.6	34	0.4-1.3	56	0.4-1.0	32	1.6-1.88	100	1.45-2.341	94.8	1.25-2.165	94
Brittle minerals (%)	0.15	35-50	96	20-41	74	45-60	100	50	100	50-75	100	28-58	84	27-69	81
Porosity (%)	0.10	4-5	80	9	100	4.7	80	10-14	100	3-5.5	72	0.5-3.1	32.5	0.9-4.9	34.5
Thickness (m)	0.20	61-91	100	49	80	91-305	100	30-122	92	152-579	100	23.18-99.84	81.8	17.22-66.94	56
Buried depth (m)	0.15	1981-2591	79	183-732	90	610-1524	98	183-1494	96	914-1829	92	571-1447.5	100	620.5-1503	99.5
Score			86		78.7		82.6		84.1		82.3		72.98		68.475