基于经济效益评价的煤层气开发有利区优选——以鄂尔多斯盆地东缘杨家坡区块为例

doi:10.13809/j.cnki.cn32-1825/te.2024.06.015

Abstract

Abstract:

The selection of favorable areas for coalbed methane（CBM） development provides critical assurance for reducing investment risks. Taking the No. 4+5 coal seam in the Shanxi Formation and the No. 8+9 coal seam in the Taiyuan Formation of the Yangjiapo block in the eastern margin of the Ordos Basin as research objects, a development potential evaluation system was established by optimizing influencing factors for combined layer development. Based on CBM development characteristics, production capacity equations were used to predict daily gas production. Economic benefit evaluation was conducted considering geological and engineering features, and favorable areas for single-seam and combined layer CBM development were ultimately delineated. The results showed that the favorable areas for combined layer development in the Yangjiapo block were located in the central and northeastern parts of the block. The economic threshold daily gas production for single-seam development of the No. 4+5 and No. 8+9 coal seams and their combined layer development were 982, 1,063, and 1,270 m³, respectively. A small portion in the northwest was suitable for single-seam development, where sequential development of the No. 4+5 and No. 8+9 coal seams could enhance production. The central and southern parts of the block were suitable for combined layer development, where optimizing drainage and production schedules could improve gas yield. For reserve areas, further clarification of geological conditions and optimization of construction techniques were needed before evaluating development feasibility. These findings enrich the methodology for selecting favorable areas in multi-seam CBM zones and provide guidance for future development planning in the study area.

Key words: coalbed methane, economic evaluation, favorable area selection, combined layer development, Yangjiapo block

CLC Number:

TE37

ZHANG Bing,DU Fengfeng,ZHANG Haifeng, et al. Selection of favorable areas for coalbed methane development based on economic benefit evaluation: A case study of Yangjiapo block in eastern margin of Ordos Basin[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(6): 933-941.

Figures/Tables 9

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References 26

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重要程度	U_ij
u_i比u_j极端不重要	<1/3
u_i比u_j不重要	1/3~<1/2
u_i比u_j稍微不重要	1/2~<1
u_i与u_j重要性相当	1
u_i比u_j稍微重要	>1~<2
u_i比u_j很重要	2~<3
u_i比u_j非常重要	≥3

判断矩阵						特征向量（W^*）	权重向量（w_o）	最大特征根（λ_max）	一致性比例（CR）
A	B₁	B₂	B₃	B₄	B₅
B₁	1	1/1.1	1/1.3	1/0.7	1/0.6	1.107	0.21	5.001	0
B₂	1.1	1	1/1.1	1/0.6	1/0.55	1.248	0.24
B₃	1.3	1.1	1	1/0.55	1/0.5	1.391	0.27
B₄	0.7	0.6	0.55	1	1/0.9	0.762	0.15
B₅	0.6	0.55	0.5	0.9	1	0.683	0.13

井号	渗透率差/10^-3μm²	储层压力差/MPa	临界解吸压力差/MPa	供液能力差/（m³/d）	层间距/m	合采潜力综合评分（A）
YJP-6	0.49	0.30	0.38	31.99	93.40	0.81
YJP-7	0.08	0.21	1.79	180.42	79.30	0.51
YJP-2	0.21	0.41	1.22	11.75	62.10	0.78
YJP-8	0.51	1.05	0.95	11.03	117.00	0.69
YJP-5	0.37	0.15	0.95	3.70	70.70	0.83
YJP-9	0.24	1.18	0.96	2.00	94.30	0.73

井号	煤层号	煤层厚度/ m	含气量/ (m³/t)	渗透率/ 10^-3μm²	临界解吸压力/MPa	单采日产气量/ m³	实际产气量/ (m³/d)	扩展层日产气量/m³	产能贡献指数/%
YJP-6	4+5号	3.20	5.50	1.38	1.92	89	5	57	39.01
YJP-6	8+9号	7.60	6.03	0.89	1.54	97	—	57	39.01
YJP-7	4+5号	6.90	5.72	1.12	3.23	461	320	86	15.71
YJP-7	8+9号	14.10	4.30	1.04	1.44	131	—	86	15.71
YJP-2	4+5号	3.30	8.20	1.42	3.53	479	—	307	39.06
YJP-2	8+9号	9.22	5.63	1.21	2.31	335	1 772	307	39.06
YJP-8	4+5号	4.70	6.32	2.87	4.01	1 371	—	548	28.55
YJP-8	8+9号	5.32	5.54	2.36	3.06	651	1 511	548	28.55
YJP-5	4+5号	3.40	6.15	2.60	3.03	499	1 144	611	55.03
YJP-5	8+9号	12.14	6.01	2.23	2.08	704	1 144	611	55.03
YJP-9	4+5号	3.50	6.55	2.83	2.85	527	1 140	587	52.72
YJP-9	8+9号	15.20	5.77	2.59	1.89	811	1 140	587	52.72

项目	单价/万元	数量			小计/万元
项目	单价/万元	D₁	D₂	D₃	D₁	D₂	D₃
井场道路/条	15	1	1	1	15.0	15	15
设计与建设/口	2	1	1	2	2.0	2	4
钻井/m	0.10	850	1 000	1 000	85.0	100	100
成孔材料/m	0.06	850	1 000	1 000	51.0	60	60
钻井定向/口	1	1	1	2	1.0	1	2
录井/口	2	1	1	2	2.0	2	4
测井费用/m	0.01	850	1 000	1 000	8.5	10	10
固井费用/口	10	1	1	2	10.0	10	20
压裂费用/口	50	2	1	2	50.0	50	100
排采设备/套	16	3	1	1	16.0	16	16
井场标准化/个	8	4	1	1	8.0	8	8
经营费/a	9	10	10	10	90.0	90	90
共计					338.5	364	429

Selection of favorable areas for coalbed methane development based on economic benefit evaluation: A case study of Yangjiapo block in eastern margin of Ordos Basin

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