Multifractal Analysis of Pore Structure and Evaluation of Deep-Buried Cambrian Dolomite Reservoir with Image Processing: A Case from Tarim Basin, NW China

Table 1

Basic information, petrophysical data from helium porosimetry, and image analysis of samples in the study.

Sample	Well	Depth	Formation	Lithology	Image Number	(%)	(%)	(%)	(mD)	(mD)
S1	BT5	4812.9	∈3ql	MD	4	0.80	2.99	0.79	0.001	0.809
S2	BT5	5782.08	∈1x	MD	6		7.48	2.01		0.889
S3	BT5	5783.95	∈1x	MD	4	4.30	8.56	2.83	0.540	3.072
S4	BT5	5784.8	∈1x	MD	6	2.50	10.20	2.74	0.01	0.558
S5	BT5	5785.12	∈1x	FD	4	3.30	14.87	4.29	1.160	7.365
S6	BT5	5785.95	∈1x	FD	6		7.24	3.07		1.703
S7	DG1	6216.87	∈3ql	SD	3	1.00	2.06	2.27	0.020	0.011
S8	DG1	6217.99	∈3ql	GD	2	1.00	0.96	0.97	0.020	0.059
S9	DG1	6256.34	∈3ql	FD	4	2.70	12.25	3.17	22.600	3.587
S10	DG1	6295.28	∈3ql	FD	3		5.46	1.73		0.644
S11	DG1	6297.6	∈3ql	FD	2		1.83	0.81		0.531
S12	HT1	6163.85	∈2a	GD	2	0.90	0.86	0.48	20.877	0.013
S13	XH2	5350.45	∈3ql	FD	5	4.80	18.40	5.24	4.050	2.977
S14	XH2	5355.3	∈3ql	SD	4		13.98	5.78		1.627
S15	XH2	5515.87	∈3ql	SD	3		3.36	0.79		0.439
S16	XH2	5517.68	∈3ql	FD	5		4.32	2.17		0.153
S17	XH2	5590.4	∈3ql	DM	2		0.83	1.13		0.002
S18	XH2	5590.9	∈3ql	DM	2		1.38	1.74		0.005
S19	XH2	5595.76	∈3ql	GD	5		4.43	1.76		0.527
S20	YQ6	7059.35	∈3ql	CD	3		3.50	2.42		0.240
S21	YQ6	7060.43	∈3ql	CD	3		2.43	1.48		0.364
S22	YQ6	7061.07	∈3ql	CD	5	1.80	2.21	1.77	1.350	0.099
S23	YQ6	7062.3	∈3ql	MD	3	0.30	1.43	0.51	0.060	0.132
S24	YQ6	7118.5	∈3ql	MD	5	2.20	11.45	3.52	0.450	1.187
S25	YQ6	7118.78	∈3ql	FD	3	2.90	3.58	1.28	0.130	0.590
S26	YQ6	7119.3	∈3ql	MD	3	2.70	2.69	1.46	0.020	0.327
S27	YQ6	7119.42	∈3ql	FD	4	0.80	1.32	1.08	0.700	0.006
S28	YQ6	7119.93	∈3ql	FD	4	2.80	5.03	2.82	0.070	1.552
S29	YQ6	7314.05	∈3ql	SD	3	0.60	1.11	0.55	0.003	0.033
S30	YQ6	7313.74	∈3ql	SD	3	0.60	2.13	0.42	0.003	0.331
S31	BT5	4811.6	∈3ql	FD	3	0.20	1.57	1.08		0.034
S32	MB1	6002.98	∈2s	SD	3	2.40	5.07	3.58	12.800	0.089
S33	MB1	6008.59	∈2s	SD	3	5.80	5.55	6.42	3.170	0.097
S34	MB1	6009.07	∈2s	GD	3	3.20	1.70	1.44	0.740	0.024
S35	TS1	7105.43	∈3ql	DM	3	0.6	1.04	1.16	0.6	0.913
S36	TS1	7268.10	∈3ql	FD	2	3.7	2.92	1.73	0.03	2.677
S37	TS1	7875.60	∈3ql	FD	4	3.7	8.09	4.39	34.14	3.772
S38	TS1	8407.56	∈3ql	SD	3	9.10	15.32	8.90	4.160	2.270

The abbreviation “∈₃ql” represents Lower Qiulitage Formation of Upper Cambrian; “∈₂s” represents Shayilik Formation of Middle Cambrian; and “∈₁x” represents Sholbrak Formation of Lower Cambrian. is the porosity obtained with Equation (1), is the porosity obtained with Equation (16), and is the permeability computed from Equations (2)–(4) with images.