Applications of Vitrinite Anisotropy in the Tectonics: A Case Study of Huaibei Coalfield, Southern North China

Table 4

Calculated results of RIS parameters, Huaibei coalfield.

Region	Coal number	Coal seam	DT	R st	R am	R ev	𝐵𝑤	𝐵𝑤/𝑅max		Axis ratio		𝐾
									𝑅max/𝑅int	𝑅int/𝑅min	𝑅max/𝑅min
Region A	TYM03	8	BD	−14.43	0.05	0.90	0.24	0.24	1.07	1.23	1.31	0.33
	TYM04	8	BC	1.06	0.04	0.90	0.19	0.19	1.11	1.11	1.23	0.96
	TYM06	10	BC	−20.43	0.03	0.82	0.13	0.15	1.03	1.15	1.18	0.20
	TYM07	10	BC	−0.05	0.02	0.75	0.07	0.09	1.05	1.05	1.10	0.95
	XTM01	7	BC	2.52	0.04	0.99	0.23	0.20	1.12	1.12	1.26	1.04
	XTM02	7	BD	14.66	0.03	1.03	0.14	0.12	1.10	1.04	1.14	2.49
	XTM06	7	DS	−6.05	0.03	1.06	0.16	0.14	1.06	1.10	1.16	0.64
	XTM07	7	BC	−4.73	0.02	1.05	0.12	0.11	1.05	1.07	1.13	0.71
Region B	LHM02	7	DS	−12.79	0.03	1.23	0.18	0.13	1.04	1.11	1.16	0.41
	LHM03	7	DS	17.42	0.06	1.31	0.38	0.24	1.23	1.07	1.32	2.93
	LHM04	9	BD	−9.73	0.02	1.38	0.17	0.12	1.04	1.08	1.13	0.51
	LHM05	9	BD	2.89	0.05	2.70	0.72	0.23	1.15	1.14	1.31	1.04
	LHM09	9	BD	−3.89	0.04	1.29	0.30	0.21	1.10	1.15	1.26	0.70
	LHM12	10	BD	12.26	0.02	1.16	0.14	0.11	1.08	1.04	1.13	2.08
	LHM14	10	BD	−4.52	0.03	1.34	0.33	0.22	1.10	1.16	1.28	0.67
	LHC01^*	—	—	25.69	0.04	1.21	0.24	0.18	1.19	1.02	1.21	9.98
	HZM03	10	BC	15.63	0.03	1.75	0.30	0.15	1.13	1.05	1.18	2.65
	HZM04	10	BC	−21.15	0.02	1.94	0.19	0.09	1.02	1.09	1.10	0.19
	HZM10	8	DS	18.44	0.01	2.57	0.15	0.06	1.05	1.01	1.06	3.63
	HZC02^*	—	—	−1.14	0.04	1.31	0.29	0.20	1.11	1.13	1.25	0.84
	HZC03^*	—	—	6.18	0.05	1.27	0.32	0.22	1.15	1.12	1.28	1.29
	BSC04^*	—	—	21.95	0.05	2.27	0.53	0.20	1.21	1.04	1.25	5.01
	BSC05^*	—	—	4.55	0.05	2.22	0.58	0.23	1.15	1.13	1.30	1.16
Region C	LLM03	8	BC	−7.01	0.04	0.98	0.18	0.17	1.07	1.12	1.21	0.59
	LLM05	8	BC	−11.51	0.07	0.72	0.24	0.29	1.10	1.28	1.41	0.40
	LLM07	10	BC	−6.37	0.05	0.85	0.21	0.22	1.10	1.17	1.28	0.60
	LLM08	10	BD	−8.05	0.02	0.79	0.08	0.10	1.04	1.07	1.11	0.58
	LLM10	8	BC	11.71	0.06	0.94	0.27	0.25	1.20	1.11	1.33	1.84
	YZM11	3	BC	−12.87	0.05	1.54	0.37	0.21	1.07	1.19	1.27	0.38
	YZM14	3	BC	−15.35	0.04	1.55	0.32	0.19	1.05	1.17	1.23	0.32
	YZM16	3	BC	−4.68	0.06	1.56	0.53	0.29	1.14	1.23	1.41	0.63
	STM01	3	BD	−21.59	0.05	1.39	0.32	0.21	1.03	1.22	1.26	0.17
	STM02	3	BC	−20.95	0.05	1.28	0.31	0.22	1.04	1.24	1.29	0.18
	STM03	3	BD	23.20	0.08	1.37	0.54	0.31	1.38	1.06	1.46	5.57
	STC06^*	—	—	−3.00	0.05	1.35	0.33	0.22	1.11	1.15	1.28	0.74

^*Data complied from [18] except for the coal seam and deformation type of these four samples. Abbreviations: BD: brittle-ductile transition; DS: ductile shear; BC: brittle crush; DT: deformation type; 𝑅_max: maximum reflectance; 𝑅_int: intermediate reflectance; 𝑅_min: minimum reflectance; 𝐵_𝑤: bireflectance, 𝑅_max−𝑅_min; K: Flinn’s parameter, (𝜀₁-𝜀₂)/(𝜀₂-𝜀₃), where 𝜀₁= ln (𝑅_max), 𝜀₂ = ln (𝑅_int), 𝜀₃ = ln (𝑅_min); 𝑅_am: RIS anisotropy magnitude, (𝑥²−𝑦²)^1/2; 𝑅_st → 𝑅_IS style, 30-arctan (𝑥/𝑦); 𝑅_ev: reflectance of equivalent volume isotropic RIS, (𝑅_max×𝑅_int×𝑅_min)^1/3; where 𝑥 = 𝑅_int/(𝑅_max+𝑅_int+𝑅_min) + [𝑦 + 1/3 cos 30^°] × tan 30^° − 1/2, 𝑦 = [𝑅_max/(𝑅_max+𝑅_int+𝑅_min) − 1/3] × cos 30^°.