Genetic Types and Main Control Factors of Microfractures in Tight Oil Reservoirs of Jimsar Sag

Table 3

Test data of core sample from well J34.

Sample	Nonbrittle mineral content (%)				Brittle mineral content (%)
	Clay mineral	Chlorite	Illite	Mixed-layer illite	Quartz	Calcite	Dolomite	Feldspar	Pyrite
J37-1	44	24	59	16	43	1	2	6	4
J37-2	24	10	71	19	63	4	6	1	2
J37-3	28	11	70	19	48	7	4	12	1
J37-4	25	14	55	31	43	8	8	13	3