五里堠井田煤系气合采产气来源及贡献判识

doi:10.13809/j.cnki.cn32-1825/te.2024.06.017

摘要/Abstract

摘要：

查明煤系气合采时的产气来源及产气贡献能为合采方案制定奠定基础。以潞安矿区五里堠井田的煤系气勘探开发资料为基础，开展了3+4号煤系地层、15号煤层中CH₄气体的碳、氢同位素测试，结合二元气体分源模型，判识出6口合采井的产气来源及占比。基于突变理论，考虑影响煤系气产量的含气性、渗透性和解吸性等因素，计算出3口合采井中3+4号煤系气和15号煤层气的产气量贡献。结果表明：多产气层气体的碳、氢同位素值存在差异时，可以据此判识各产气层的来源及占比。当3+4号煤系地层稳定产气但15号煤层未解吸时，产出的气体均来源于3+4号煤系地层；当3+4号煤系地层和15号煤层均稳定产气时，3+4号煤系地层产气来源占42%~45%，15号煤层产气来源占55%~58%。基于突变理论计算出的3口合采井的产量劈分系数与实验测试结果相差不大，印证了该方法的可行性。该成果为准确判识该井田煤系气合采产层来源及贡献提供了方法和依据。

关键词: 煤系气合采井, 产气来源, 产气量贡献, 碳、氢同位素, 突变理论

Abstract:

Determining the gas source and contribution in coal measure gas commingled production lays the foundation for developing commingled production schemes. Based on coal measure gas exploration and development data from the Wulihu mining area in the Lu’an mining area, carbon and hydrogen isotope tests of CH₄ from the No. 3+4 coal measure strata and the No. 15 coal seam were conducted. Using a binary gas source model, the gas source and proportions of six commingled wells were identified. Additionally, considering factors such as gas content, permeability, and desorption capacity, the production contributions of gas from the No. 3+4 coal measure strata and the No. 15 coal seam in three commingled wells were calculated based on catastrophe theory. The results showed that when isotopic differences in carbon and hydrogen values were observed between multiple gas-producing layers, these differences could be used to determine the source and proportion of gas from each layer. When the No. 3+4 coal measure strata consistently produced gas while the No. 15 coal seam did not desorb gas, the produced gas entirely originated from the No. 3+4 coal measure strata. When both the No. 3+4 coal measure strata and the No. 15 coal seam stably produced gas, the gas productions were 42%-45% and 55%-58%, respectively. The production split coefficients calculated based on catastrophe theory closely matched experimental results, confirming the feasibility of this method. This study provides a method and reference for accurately identifying gas sources and contributions in coal measure gas commingled production for this mining area.

Key words: coal measure gas commingled well, gas source, gas production contribution, carbon and hydrogen isotopes, catastrophe theory

中图分类号:

TE32

倪小明,冯冬,郝少伟等. 五里堠井田煤系气合采产气来源及贡献判识[J]. 油气藏评价与开发, 2024, 14(6): 952-958.

NI Xiaoming,FENG Dong,HAO Shaowei, et al. Gas source and contribution identification for coal measure gas commingled production in Wulihou mining area[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(6): 952-958.

图/表 12

图1

图2

表1

图3

表2

图4

表3

表4

常用初等突变理论势函数"

类型	状态变量	控制变量	势函数	归一化公式
折迭型	1	1	F（x）=x³+W₁x	x_W₁= $W 1 12$
尖点型	1	2	F（x）=x⁴+kx²+φx	x_k= $k 12$ ，x_φ= $φ 13$
燕尾型	1	3	F（x）=x⁵+U₁x³+U₂x²+U₃x	x_U₁= $U 1 12$ ，x_U₂= $U 2 13$ ，x_U₃= $U 3 14$

表4

图5

表5

表6

表7

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井号	3号煤层临界解吸压力/MPa	3号煤层井底流压/MPa	3+4号煤层是否解吸	15号煤层临界解吸压力/MPa	15号煤层井底流压/MPa	15号煤层是否解吸
L-01	1.64	1.17	是	1.30	3.15	否
L-02	1.75	1.32	是	1.35	3.20	否
L-03	1.68	1.40	是	1.42	2.76	否
L-04	1.72	-1.67	是	1.28	0.28	是
L-05	1.66	-1.53	是	1.32	0.16	是
L-06	1.53	-1.61	是	1.42	0.24	是

气样来源	δ¹³C/‰	δ D/‰
3号煤层取心	-37.20	-211.70
4号煤层取心	-37.60	-211.30
15号煤层取心	-39.98	-214.80
L-01井取心	-36.30	-211.70
L-02井取心	-37.80	-210.05
L-03井取心	-36.50	-212.90
L-04井取心	-38.80	-214.40
L-05井取心	-38.85	-213.95
L-06井取心	-38.90	-214.80

阶段	典型井	产气来源占比/%
阶段	典型井	砂岩气层、3+4号煤层	15号煤层
砂岩游离气、 3+4号	L-01井	100	0
	L-02井	100	0
	L-03井	100	0
砂岩游离气、 3+4号、15号	L-04井	45	55
	L-05井	43	57
	L-06井	42	58

数值	层位	煤储层含气性			煤储层渗透性		煤储层解吸性
数值	层位	含气量/（m³/t）	含气饱和度	煤层厚度/m	渗透率/10^-3μm²	孔隙度/%	临储比
原始值	3+4号	10.960 0	0.710 0	2.540 0	0.098 0	3.580 0	0.750 0
	15号	11.850 0	0.770 0	9.720 0	0.111 0	3.840 0	0.480 0
	突变面	10.960 0	0.710 0	2.540 0	0.098 0	3.580 0	0.480 0
归一化	3+4号	0.924 9	0.922 1	0.261 3	0.882 9	0.932 3	1.000 0
	15号	1.000 0	1.000 0	1.000 0	1.000 0	1.000 0	0.630 0
	突变面	0.924 9	0.922 1	0.261 3	0.882 9	0.932 3	0.630 0

层位	煤储层含气性	煤储层渗透性	煤储层解吸性	各产层目标值	产量劈分系数/%
3+4号	0.883 3	0.958 3	1.000 0	0.975 3	42.94
15号	1.000 0	1.000 0	0.794 6	0.981 4	57.06
突变面	0.883 3	0.958 3	0.794 6	0.956 6