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

Table 2

Effect of fluids on mechanical properties of the Lucaogou Formation tight sandstones in the Jimsar Sag, Junggar Basin.

Water saturation (%)	Compressive strength (GPa)	Ratio of decrease (%)	Elastic modulus (GPa)	Ratio of decrease (%)	Poisson’s ratio	Ratio of increase (%)	Group
0	156.94		29.75		0.259		G1
30	151.44	0.035	22.78	0.23	0.258	0.0039	G1
80	146.12	0.035	20.23	0.11	0.295	0.1434	G1
100	80.58	0.449	7.52	0.63	0.554	0.8780	G1
0	156.33		25.01		0.283		G2
30	146.16	0.065	21.65	0.13	0.284	0.0035	G2
90	90.22	0.321	14.30	0.34	0.289	0.0176	G2
100	80.23	0.191	8.30	0.42	0.446	0.5433	G2
0	146.21		26.35		0.214		G3
30	140.90	0.036	20.99	0.20	0.221	0.0327	G3
70	93.73	0.335	l8.88	0.10	0.368	0.6652	G3
100	79.26	0.154	15.36	0.19	0.392	0.0652	G3