A Quantitative Evaluation Method for the Natural Gas Hydrate Reservoir Parameters in the Shenhu Area, South China Sea

doi:10.19657/j.geoscience.1000-8527.2023.038

Abstract

Abstract:

Marine gas hydrate exists in the unconsolidated argillaceous silt and silty mud formations in a solid state. It is completely different from the occurrence of conventional oil and gas reservoirs, which are consolida-ted sandstone formations. Therefore, the logging evaluation of hydrate reservoirs is more challenging than the conventional ones. Since 2007, four hydrate drillings have been carried out in the Shenhu area of South China Sea. Abundant geophysical and core data have been obtained and it has been confirmed that there is a huge potential for natural gas hydrate resources in this area. In this study, starting from the research and analysis of conventional logging, special logging data, and core data in Shenhu, we summarized the logging response characteristics of hydrate formation. The core data were used to calibrate logging. At the end, the calculation model of reservoir lithology, physical properties, and hydrate saturation is established. Consequently, a set of quantitative evaluation system for natural gas hydrate reservoir parameters in the Shenhu area is proposed. The proposed method in this study was used to evaluate the wells comprehensively. The average porosity of hydrate formation is 49.91%, and the average hydrate saturation is 29.75%. The pore structure is mainly small pores and the permeability is poor. The evaluation results are consistent with the core experimental results with a coincidence rate of 85%. The research results provide a new reference for the evaluation of hydrate resources and accumulation in the Shenhu area.

Key words: gas hydrate, logging response characteristics, reservoir parameter calculation, quantitative evaluation method

CLC Number:

KANG Dongju, LIU Jundong, LI Haiyan, QU Cuixia, LU Jing’an, XIE Yingfeng, ZHONG Chao, REN Jinfeng. A Quantitative Evaluation Method for the Natural Gas Hydrate Reservoir Parameters in the Shenhu Area, South China Sea[J]. Geoscience, 2024, 38(02): 385-397.

Figures/Tables 16

References 21

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井号	GR (API)	RHON (g/cm³)	V_qfm (%)	V_clay (%)	V_car (%)	井号	GR (API)	RHON (g/cm³)	V_qfm (%)	V_clay (%)	V_car (%)
19B	60.13	1.52	0.61	0.28	0.12	18B	60.99	1.78	0.57	0.34	0.09
19B	61.71	1.60	0.58	0.28	0.14	18B	63.65	1.78	0.62	0.32	0.10
19B	62.51	1.56	0.61	0.31	0.08	18B	66.79	1.75	0.67	0.32	0.11
19B	60.73	1.63	0.61	0.27	0.12	18B	64.48	1.75	0.61	0.31	0.07
19B	62.62	1.70	0.62	0.28	0.17	18B	66.54	1.77	0.65	0.31	0.08
19B	62.44	1.71	0.60	0.27	0.13	18B	63.06	1.78	0.63	0.31	0.06
19B	57.83	1.70	0.57	0.25	0.08	18B	68.10	1.79	0.63	0.33	0.04
19B	65.12	1.76	0.66	0.36	0.13	18B	64.75	1.72	0.63	0.32	0.05
19B	66.89	1.66	0.67	0.35	0.10	18B	65.45	1.70	0.65	0.30	0.05
19B	61.41	1.71	0.61	0.29	0.11	18B	63.65	1.70	0.66	0.29	0.05
19B	66.59	1.73	0.60	0.31	0.13	18B	62.76	1.74	0.66	0.29	0.10
19B	59.14	1.72	0.52	0.27	0.25	18B	64.35	1.75	0.70	0.28	0.06
19B	58.26	1.78	0.54	0.25	0.22	18B	67.57	1.79	0.68	0.28	0.04
19B	61.81	1.79	0.56	0.32	0.20	18B	66.82	1.74	0.64	0.29	0.08
19B	57.82	1.78	0.64	0.28	0.12	11B	69.56	1.75	0.74	0.29	0.09
19B	59.31	1.81	0.59	0.33	0.08	11B	69.37	1.75	0.61	0.30	0.09
18B	61.44	1.76	0.60	0.33	0.07	11B	66.60	1.87	0.64	0.27	0.09
18B	59.25	1.76	0.62	0.27	0.08	11B	69.27	1.89	0.60	0.30	0.10

井号	GR (API)	RHON (g/cm³)	V_qfm (%)	V_clay (%)	V_car (%)	井号	GR (API)	RHON (g/cm³)	V_qfm (%)	V_clay (%)	V_car (%)
19B	60.13	1.52	0.61	0.28	0.12	18B	60.99	1.78	0.57	0.34	0.09
19B	61.71	1.60	0.58	0.28	0.14	18B	63.65	1.78	0.62	0.32	0.10
19B	62.51	1.56	0.61	0.31	0.08	18B	66.79	1.75	0.67	0.32	0.11
19B	60.73	1.63	0.61	0.27	0.12	18B	64.48	1.75	0.61	0.31	0.07
19B	62.62	1.70	0.62	0.28	0.17	18B	66.54	1.77	0.65	0.31	0.08
19B	62.44	1.71	0.60	0.27	0.13	18B	63.06	1.78	0.63	0.31	0.06
19B	57.83	1.70	0.57	0.25	0.08	18B	68.10	1.79	0.63	0.33	0.04
19B	65.12	1.76	0.66	0.36	0.13	18B	64.75	1.72	0.63	0.32	0.05
19B	66.89	1.66	0.67	0.35	0.10	18B	65.45	1.70	0.65	0.30	0.05
19B	61.41	1.71	0.61	0.29	0.11	18B	63.65	1.70	0.66	0.29	0.05
19B	66.59	1.73	0.60	0.31	0.13	18B	62.76	1.74	0.66	0.29	0.10
19B	59.14	1.72	0.52	0.27	0.25	18B	64.35	1.75	0.70	0.28	0.06
19B	58.26	1.78	0.54	0.25	0.22	18B	67.57	1.79	0.68	0.28	0.04
19B	61.81	1.79	0.56	0.32	0.20	18B	66.82	1.74	0.64	0.29	0.08
19B	57.82	1.78	0.64	0.28	0.12	11B	69.56	1.75	0.74	0.29	0.09
19B	59.31	1.81	0.59	0.33	0.08	11B	69.37	1.75	0.61	0.30	0.09
18B	61.44	1.76	0.60	0.33	0.07	11B	66.60	1.87	0.64	0.27	0.09
18B	59.25	1.76	0.62	0.27	0.08	11B	69.27	1.89	0.60	0.30	0.10

井号	深度	渗透率 (10^-3 μm²)	饱和度 (%)	孔隙度 (%)	泥质含量 (%)
01B	103.0	2.0	0	0.66	1.0
01B	138.0	20.0	0.03	0.67	3.0
01B	152.0	2.0	0.42	0.61	42.0
01B	174.0	3.0	0.06	0.55	6.0
01C	164.0	4.0	0.21	0.51	21.0
01C	167.0	2.0	0.16	0.51	16.0
01C	178.0	2.0	0.05	0.56	5.0
01C	181.0	8.0	0.06	0.55	6.0
01C	184.0	2.0	0.09	0.53	9.0
02B	121.0	10.0	0	0.61	0.3
02B	146.0	2.0	0.40	0.53	40.0
02B	182.0	5.0	0	0.56	0.1
03B	50.0	6.0	0	0.50	0.2
03B	166.0	4.0	0.20	0.46	20.0
03B	222.0	5.0	0.01	0.45	0.5
11C	168.0	0.9	0.45	0.44	45.0
11C	210.5	2.0	0.01	0.50	0.5
17B	228.0	0.4	0.37	0.47	37.0
18B	143.0	5.0	0.10	0.66	10.0
18B	144.9	2.0	0.50	0.65	50.0
18B	174.5	2.0	0.02	0.56	2.0

井号	深度	渗透率 (10^-3 μm²)	饱和度 (%)	孔隙度 (%)	泥质含量 (%)
01B	103.0	2.0	0	0.66	1.0
01B	138.0	20.0	0.03	0.67	3.0
01B	152.0	2.0	0.42	0.61	42.0
01B	174.0	3.0	0.06	0.55	6.0
01C	164.0	4.0	0.21	0.51	21.0
01C	167.0	2.0	0.16	0.51	16.0
01C	178.0	2.0	0.05	0.56	5.0
01C	181.0	8.0	0.06	0.55	6.0
01C	184.0	2.0	0.09	0.53	9.0
02B	121.0	10.0	0	0.61	0.3
02B	146.0	2.0	0.40	0.53	40.0
02B	182.0	5.0	0	0.56	0.1
03B	50.0	6.0	0	0.50	0.2
03B	166.0	4.0	0.20	0.46	20.0
03B	222.0	5.0	0.01	0.45	0.5
11C	168.0	0.9	0.45	0.44	45.0
11C	210.5	2.0	0.01	0.50	0.5
17B	228.0	0.4	0.37	0.47	37.0
18B	143.0	5.0	0.10	0.66	10.0
18B	144.9	2.0	0.50	0.65	50.0
18B	174.5	2.0	0.02	0.56	2.0

井号	拟合系数		决定系数	相关系数
井号	a	b	R²	R
X11	0.1989	3.0211	0.9110	0.9545
X17	0.3146	2.8776	0.9638	0.9817
X07	0.1778	2.3017	0.9061	0.9519
X03	0.2077	2.3230	0.9295	0.9641
X01	0.1356	2.5172	0.8978	0.9475
算数平均	0.2069	2.6081	0.9216	0.9599
标准差	0.0044	0.1067	-	-
方差	0.0663	0.3266	-	-