The Distribution and Origin of Carbonate Cements in Deep-Buried Sandstones in the Central Junggar Basin, Northwest China

Table 1

Composition from EDX analysis of carbonate cements in sandstone of Block 3.

Well	Depth/m	Content/%
		Na2O	MgO	Al2O3	SiO2	CaO	MnO	Fe2O3	K2O
Y1	6117.38			2.22	5.54	82.59	4.31	5.35
Y2	5970.53		17.48		5.55	47.38	4.43	25.16
	6001.23		19.00		6.79	63.28	6.41	4.52
Y3	5614.22	1.37	13.92	3.33	8.70	43.33	3.47	24.45
	5868.00		1.59	3.04	4.78	79.22	5.95	5.04	0.37
Y6	6028.60		21.22			52.30	3.63	22.85
	6084.00			1.36	5.26	91.04		2.34
Y7	6095.00			1.27	2.45	92.39	1.76	2.13
	6101.55		3.84	4.56	15.13	45.61	7.50	22.51	0.84
Y8	6088.55		21.43	2.44	1.99	51.05		23.08
	6096.20			0.95	9.21	85.44		4.02	0.38