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

摘要/Abstract

摘要：

优选煤层气开发的有利区，能为降低煤层气开发投资风险提供重要保障。以鄂尔多斯盆地东缘杨家坡区块山西组4+5号和太原组8+9号煤层为研究对象，通过优选合层开发影响因素，建立了合层开发潜力评价体系；基于煤层气开发特点，采用产能公式，预测了日产气量；基于地质-工程特点，进行了经济效益评价；最终划分了煤层气单层开发、合层开发有利区。结果表明：杨家坡区块煤层气合层开发有利区位于区块的中部及东北部；单层开发4+5号煤层、8+9号煤层与两煤层合层开发的经济极限日产气量分别为982、1 063、1 270 m³；研究区的西北部小部分区域适合进行单层开发，可通过4+5号煤层与8+9号煤层接替开发，提高产气效果；研究区的中南部适合进行合层开发，通过优化排采工作制度，改善产气情况；针对后备区，需进一步查明地质条件、优化施工工艺措施后，再评价开发的可行性。研究结果丰富了多煤层发育区有利区选区方法，为研究区下一步开发方案制定具有一定的指导意义。

关键词: 煤层气, 经济评价, 有利区优选, 合层开发, 杨家坡区块

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

中图分类号:

TE37

张兵,杜丰丰,张海锋等. 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[J]. 油气藏评价与开发, 2024, 14(6): 933-941.

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.

图/表 9

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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