Quantitative Interpretation of Gas Saturation in Paleozoic Gas Reservoirs in the Ordos Basin: Taking Well A Area in the Southeastern Yishaan Slope as an Example

doi:10.7657/XJPG20260408

Abstract

Abstract:

To enhance the quantitative interpretation accuracy of fluid saturation in the Paleozoic tight sandstone gas reservoirs in the Ordos Basin, the physical and electric properties of the reservoir were analyzed, indicating a feasibility to interpret porosity, water saturation and gas saturation in sequence. The Archie formula was re-derived to obtain an equation to represent water-bearing porosity and resistivity, and the in-situ resistivity of formation water was defined, without the necessity to perform litho-electric experiments and formation water resistivity tests. On the basis of the above theory, taking the Well A area in the southeastern Yishaan slope as an example, a quantitative interpretation approach of reservoir fluid was established. Firstly, the existing basic data acquisition process and the main error causes were analyzed, and the data with the minimum fluid loss were selected as the basic data for interpreting water-bearing porosity. Then, the crossplot of water-bearing porosity and resistivity was established, and the water-bearing porosity interpretation equation was formed. Finally, according to the porosity interpretation equation and the water-bearing porosity interpretation equation, the gas saturation of reservoirs in the Well A area was quantitatively interpreted. It is found that the obtained gas saturation is highly consistent with the production results, and is 95.14% coincident with the single-layer gas test results. Compared with the results from Archie formula, the proposed interpretation approach exhibits lower technical requirements for experiments, and achieves improvements in both accuracy and resolution. This research enriches the theory for quantitative interpretation of tight sandstone gas reservoirs in the Ordos Basin, and provides reference for quantitative interpretation of tight sandstone gas reservoirs in other areas.

Key words: Ordos Basin, Yishaan slope, Paleozoic, tight sandstone gas reservoir, tight reservoir, water-bearing porosity, gas saturation

CLC Number:

TE311.2

CHEN Zhanjun, REN Zhanli, GAO Xiaoping, LIU Baoping, YU Chunyong, HAO Qianqian, WANG Fuyuan. Quantitative Interpretation of Gas Saturation in Paleozoic Gas Reservoirs in the Ordos Basin: Taking Well A Area in the Southeastern Yishaan Slope as an Example[J]. Xinjiang Petroleum Geology, 2026, 47(4): 451-458.

Figures/Tables 5

Table 1.

Fig. 1.

Table 2.

Fig. 2.

Table 3.

Interpretation results and single-layer gas test results in Well A area"

井名	层位	砂体深度/m	压力系数	井口产量/ （m³·d^-1）	无阻流量/ （m³·d^-1）	产水量/ （m³·d^-1）	试气结果	声波时差/ （μs·m^-1）	地层真电阻率/ （Ω·m）	深侧向电阻率/ （Ω·m）	浅侧向电阻率/ （Ω·m）	孔隙度/%	地层真电阻率计算含水饱和度	深侧向电阻率计算含水饱和度	浅侧向电阻率计算含水饱和度	平均含水饱和度	含气饱和度	解释结果
Y291井	盒8段	2 446.63—2 453.13		0	0	0	干层	232.52	27.96	21.97	20.20	8.01	0.76	0.78	0.80	0.78	0.22	水层
Y105井	盒8段	2 564.38—2 569.13	0.76	3 870.00	3 870.00	0	差气层	218.42	43.66	142.95	107.22	6.02	0.80	0.40	0.48	0.56	0.44	差气层
Y118井	盒8段	2 590.00—2 597.50	0.80	3 309.00	3 757.00	0	差气层	229.77	1 103.90	255.86	81.95	7.62	0.12	0.24	0.43	0.26	0.74	气层
Z24井	山1段	2 731.25—2 740.50	0.88	9 132.00	15 074.00	0	气层	222.44	218.75	361.41	354.76	7.50	0.33	0.28	0.17	0.26	0.74	气层
Y386井	山1段	2 678.00—2 690.25	0.68	8 396.00	8 749.00	1.24	气层	225.61	152.76	325.25	292.06	8.08	0.36	0.27	0.17	0.27	0.73	气层
Y296井	山1段	2 744.25—2 755.25	0.84	13 922.00	23 572.00	0	气层	224.32	180.88	314.92	285.96	7.84	0.35	0.28	0.18	0.27	0.73	气层
Y318井	山1段	2 655.00—2 665.50	0.87	5 070.00	8 625.00	0	气层	226.85	137.94	229.51	206.11	8.30	0.37	0.31	0.21	0.29	0.71	气层
Y386井	山1段	2 711.13—2 723.13	0.73	7 364.00	11 580.00	0	气层	223.26	139.49	244.70	227.84	7.65	0.40	0.32	0.21	0.31	0.69	气层
Z31-3井	山2段	2 844.88—2 854.38	0.82	2 517.00	7 240.00	0	差气层	216.79	149.17	331.09	301.59	6.55	0.42	0.32	0.36	0.37	0.63	差气层
Y293井	山2段	2 752.38—2 757.13	0.79	3 136.00	3 249.00	0	差气层	218.86	80.65	75.49	62.88	6.79	0.54	0.59	0.71	0.61	0.39	差气层
Y362井	山2段	2 620.00—2 629.13	0.75	0	0	0.20	干层	198.92	160.66	251.50	226.06	4.47	0.59	0.53	0.60	0.57	0.43	干层
Z47井	山2段	2 855.88—2 867.13	0.85	10 989.00	28 406.00	0.24	气层	215.39	1 026.48	2 637.98	2 019.73	6.38	0.17	0.14	0.16	0.15	0.85	气层
Z5井	山2段	2 772.88—2 782.50	0.89	85 285.00	203 723.00	1.04	气层	204.68	182.58	1 085.55	1 042.13	5.14	0.48	0.25	0.26	0.33	0.67	差气层
Y750井	山2段	2 588.75—2 592.75		0	0	6.50	水层	192.02	108.22	247.94	183.74	3.67	0.87	0.65	0.81	0.77	0.23	水层
A33井	本溪组	2 849.63—2 852.25		0	0	2.10	干层	202.40	85.21	84.90	75.10	4.44	0.40	0.64	0.75	0.60	0.40	干层
Y292井	本溪组	2 654.88—2 671.13		0	0	3.20	干层	197.27	35.59	67.98	62.15	3.99	0.82	0.81	0.92	0.85	0.15	干层
Z22井	本溪组	3 002.50—3 011.13	1.01	60 819.00	447 540.00	1.07	气层	225.30	135.48	876.99	691.03	6.48	0.20	0.12	0.15	0.16	0.84	气层
Y479井	本溪组	2 829.38—2 835.00	1.10	153 891.00	301 165.00	0.65	气层	208.42	153.72	196.73	181.47	4.98	0.24	0.35	0.41	0.33	0.67	气层
Y743井	本溪组	2 952.00—2 954.50	0.98	10 388.00	24 245.00	0	气层	199.55	117.26	139.24	111.95	4.19	0.34	0.51	0.64	0.50	0.50	气层
Z6井	本溪组	2 792.50—2 796.75		0	0	10.20	水层	193.47	65.21	80.94	84.61	3.65	0.59	0.80	0.85	0.75	0.25	水层

Table 3.

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气区	a	m	b	n	R_w/（Ω·m）
A井区	1.000 0	1.885 0	1.037 9	1.901 3	0.06
B井区（第1次测量）	3.658 8	1.210 0	1.161 8	1.499 0	0.06
B井区（第2次测量）	1.042 6	1.845 0	0.944 7	1.862 4	0.05
C井区	1.004 1	1.013 8	1.654 0	1.228 0	0.03
D井区	1.401 2	1.350 0	1.081 7	4.168 2	0.04

层位	孔隙度解释方程	电阻率系列	含水孔隙度解释方程	aR_w/（Ω·m)	m	n
盒8段	$\varphi =0.141\Delta t-24.807$	地层真电阻率	${\varphi }_{w}=33.474{e}^{-0.513{R}_{t}}$	0.118 6	1.948 3	1.948 3
		浅侧向电阻率	${\varphi }_{w}=26.908{e}^{-0.496{R}_{s}}$	0.063 4	2.101 1	2.101 1
		深侧向电阻率	${\varphi }_{w}=29.844{e}^{-0.505{R}_{d}}$	0.091 2	1.980 6	1.980 6
山1段	$\varphi =0.181\Delta t-32.764$	地层真电阻率	${\varphi }_{w}=28.856{e}^{-0.454{R}_{t}}$	0.064 8	2.201 3	2.201 3
		浅侧向电阻率	${\varphi }_{w}=33.549{e}^{-0.559{R}_{s}}$	0.141 6	1.789 6	1.789 6
		深侧向电阻率	${\varphi }_{w}=28.760{e}^{-0.445{R}_{d}}$	0.060 9	2.245 6	2.245 6
山2段	$\varphi =0.116\Delta t-18.655$	地层真电阻率	${\varphi }_{w}=29.675{e}^{-0.477{R}_{t}}$	0.078 4	2.095 3	2.095 3
		浅侧向电阻率	${\varphi }_{w}=31.160{e}^{-0.451{R}_{s}}$	0.075 5	2.215 6	2.215 6
		深侧向电阻率	${\varphi }_{w}=25.618{e}^{-0.431{R}_{d}}$	0.042 3	2.322 6	2.322 6
本溪组	$\varphi =0.089\Delta t-13.520$	地层真电阻率	${\varphi }_{w}=40.143{e}^{-0.702{R}_{t}}$	0.272 4	1.424 7	1.424 7
		浅侧向电阻率	${\varphi }_{w}=34.432{e}^{-0.541{R}_{s}}$	0.156 8	1.766 8	1.766 8
		深侧向电阻率	${\varphi }_{w}=34.044{e}^{-0.567{R}_{d}}$	0.139 3	1.848 6	1.848 6