Origin and Productivity Response of Gas and Water in Coalbed Methane Field of Yuwang Block at Laochang, Yunnan Province

doi:10.19657/j.geoscience.1000-8527.2021.076

Abstract

Abstract:

To improve the productivity of coalbed methane (CBM) in Yuwang Block at Laochang(Yunnan province), we analyzed the composition of gas samples, methane, carbon isotopes, hydrogen-oxygen (H-O) isotopes of produced water and trace elements in 6 CBM pilot test wells, combined with the geological conditions and productivity characteristics of CBM. And we discussed the productivity indicating significance from isotopes and trace elements of the gas and water. The results show that CH₄ is the main component of local CBM, which accounts for over 97%. There are minor amounts of C₂H₆, N₂ and CO₂ but no heavy hydrocarbons, and the coalbed methane is mainly of thermal origin and has undergone later-stage secondary transformation. The H-O isotope characteristics of the CBM produced water indicate that the produced water was sourced from meteoric water, which show a clear ¹⁸O drift. The result of principal component analysis shows that trace elements in the produced water can be divided into two principal components, which reflect the gas and water production of gas wells, respectively. Integrating the comprehensive gas and water production, hydrogen-oxygen isotopes and trace elements data of the produced water from CBM wells, we suggested that the produced water of other wells in the Yuwang block is mainly fracturing fluid (except LC-C3 well), and that the reservoir pressure drop is limited, causing low gas well production.

Key words: Yuwang block, coalbed methane, hydrogen and oxygen isotopes, trace element, productivity

CLC Number:

ZHAI Jiayu, ZHANG Songhang, TANG Shuheng, GUO Huiqiu, LIU Bing, JI Chaoqi. Origin and Productivity Response of Gas and Water in Coalbed Methane Field of Yuwang Block at Laochang, Yunnan Province[J]. Geoscience, 2022, 36(05): 1341-1350.

Figures/Tables 10

References 47

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样号	最大日产气量 /(m³/d)	最大日产水量 /(m³/d)	累计产水量/ m³	压裂液量/ m³	气体组分/%				稳定同位素含量/‰				干燥系数	R_o/%
					气体组分/%				甲烷		二氧化碳
					CH₄	C₂H₆	N₂	CO₂	δ¹³C	δD	δ¹³C	δ¹⁸O
LC-S1	120.675	1.977	582.97	1 086.3	97.70	0.05	1.13	1.12	-34.2	-111.7	-11.7	-5.3	0.999	3.11
LC-C4	692.258	4.756	722.50	1 400^*	97.25	0.03	1.47	1.25	-33.3	-112.6	-10.0	-5.6	0.999	3.08
LC-S2	808.957	5.221	549.38	1 116.9	98.07	0.04	0.65	1.24	-34.0	-113.1	-10.4	-6.9	0.999	3.16
LC-C1	335.938	4.532	410.08	1 400^*	/	/	/	/	/	/	/	/	/	/
LC-C3	423.063	9.854	4133.03	1 400^*	98.33	0.04	1.09	0.24	-34.0	-113.5	-13.8	-6.7	0.996	3.09
LC-C2	402.429	5.381	537.53	1 400^*	95.84	0.06	1.78	2.32	-34.5	-117.3	-12.9	-7.0	0.999	3.28

样号	最大日产气量 /(m³/d)	最大日产水量 /(m³/d)	累计产水量/ m³	压裂液量/ m³	气体组分/%				稳定同位素含量/‰				干燥系数	R_o/%
					气体组分/%				甲烷		二氧化碳
					CH₄	C₂H₆	N₂	CO₂	δ¹³C	δD	δ¹³C	δ¹⁸O
LC-S1	120.675	1.977	582.97	1 086.3	97.70	0.05	1.13	1.12	-34.2	-111.7	-11.7	-5.3	0.999	3.11
LC-C4	692.258	4.756	722.50	1 400^*	97.25	0.03	1.47	1.25	-33.3	-112.6	-10.0	-5.6	0.999	3.08
LC-S2	808.957	5.221	549.38	1 116.9	98.07	0.04	0.65	1.24	-34.0	-113.1	-10.4	-6.9	0.999	3.16
LC-C1	335.938	4.532	410.08	1 400^*	/	/	/	/	/	/	/	/	/	/
LC-C3	423.063	9.854	4133.03	1 400^*	98.33	0.04	1.09	0.24	-34.0	-113.5	-13.8	-6.7	0.996	3.09
LC-C2	402.429	5.381	537.53	1 400^*	95.84	0.06	1.78	2.32	-34.5	-117.3	-12.9	-7.0	0.999	3.28

样号	微量元素含量/10^-6										水氢氧同位素/‰
样号	Li	Ba	Cu	Mn	Mo	Rb	Sr	Ti	W	Zn	δD	δ¹⁸O
LC-S1	320	670	3	16	3	17	3 140	86	5	3	-83.5	-9.7
LC-C4	430	1 920	5	22	3	35	5 680	116	7	4	-78.0	-9.6
LC-S2	620	1 090	5	9	5	28	4 140	111	8	4	-81.4	-10.2
LC-C1	480	250	3	0.8	9	58	3 520	75	3	4	-71.9	-9.4
LC-C3	160	10	1	26	5	5	750	49	2	3	-84.4	-10.8
LC-C2	290	440	3	8	7	39	4 380	84	7	5	-85.7	-10.5

样号	微量元素含量/10^-6										水氢氧同位素/‰
样号	Li	Ba	Cu	Mn	Mo	Rb	Sr	Ti	W	Zn	δD	δ¹⁸O
LC-S1	320	670	3	16	3	17	3 140	86	5	3	-83.5	-9.7
LC-C4	430	1 920	5	22	3	35	5 680	116	7	4	-78.0	-9.6
LC-S2	620	1 090	5	9	5	28	4 140	111	8	4	-81.4	-10.2
LC-C1	480	250	3	0.8	9	58	3 520	75	3	4	-71.9	-9.4
LC-C3	160	10	1	26	5	5	750	49	2	3	-84.4	-10.8
LC-C2	290	440	3	8	7	39	4 380	84	7	5	-85.7	-10.5

主成分	F₁	F₂	F₃	F₄	F₅
Li	0.801	0.166	-0.539	-0.137	0.148
Ba	0.788	-0.558	0.004	0.250	0.077
Cu	0.964	-0.205	-0.162	-0.012	0.049
Mn	-0.408	-0.843	0.202	0.191	0.215
Mo	-0.074	0.983	0.004	0.015	0.166
Rb	0.572	0.735	-0.036	0.358	-0.055
Sr	0.952	-0.018	0.194	0.203	-0.119
Ti	0.947	-0.311	-0.069	-0.023	-0.033
W	0.862	-0.236	0.255	-0.367	-0.034
Zn	0.625	0.525	0.557	-0.090	0.127
特征值	5.628	3.026	0.776	0.430	0.140
方差贡献率/%	56.277	30.264	7.757	4.304	1.398
累计方差贡献率/%	56.277	86.541	94.298	98.602	100.000