黔西地区红果区块煤层气资源评价与勘探潜力分析

doi:10.13809/j.cnki.cn32-1825/te.2020.04.002

摘要/Abstract

摘要：

为查明红果区块煤层气勘探潜力,利用煤炭钻孔及煤层气井资料,从地质背景、煤岩煤质、储层物性、含气性和保存条件等入手,系统分析了煤层气富集的基本地质条件,初步评价了煤层气的资源潜力,并对有利富气区进行综合评价与优选。结果认为：红果区块煤储层具有埋深适中（500~1 200 m）、累厚大（10.3~25.8 m）、热演化程度中等（0.9 %~2.0 %）、含气量高（10.8~26.3 m ³/t）等特征,煤层气成藏地质条件优越。综合评价煤层气有利区面积260 km ²,资源量422×10 ⁸m ³,其中I₁类有利区位于向斜东部,演化程度高、割理裂隙发育、压力系数高、保存条件优越,是下一步勘探评价的重点目标区。

关键词: 红果区块, 煤层气, 资源评价, 勘探潜力, 盘关次向斜

Abstract:

In order to evaluate the CBM exploration potential of Hongguo Block, the basic geological conditions for the enrichment of CBM reservoirs were analyzed from the aspects such as stratigraphic distribution, coal quality, physical characteristics, gas-bearing capacity and preservation conditions by the data of coal drilling and CBM wells. And then the resource potential of CBM was preliminarily accessed. Finally, the favorable gas-rich areas were further optimized. Results show that coal bed in Hongguo Block has the characteristics of moderate burial depth（500~1 200 m）, large accumulated thickness（10.3~25.8 m）, moderate thermal maturity（0.9 %~2.0 %） and high gas content（10.8~26.3 m ³/t）, with superior geological conditions of CBM accumulation. By the comprehensive evaluation, the favorable CBM area is about 260 km ² and the amount of resource is about 422×10 ⁸ m ³. The most favorable area type I₁ is located in the east of Panguan syncline, with high thermal evolution degree, developed cleavage and fissure, high pressure coefficient, and superior preservation conditions, which is the primary target area for the next CBM exploration.

Key words: Hongguo Block, CBM, resource assessment, exploration potential, Panguan syncline

中图分类号:

TE122

周德华,李倩文,蔡勋育等. 黔西地区红果区块煤层气资源评价与勘探潜力分析[J]. 油气藏评价与开发, 2020, 10(4): 12-16.

Dehua ZHOU,Qianwen LI,Xunyu CAI, et al. Resource assessment and exploration potential analysis of CBM in Hongguo Block, western Guizhou[J]. Reservoir Evaluation and Development, 2020, 10(4): 12-16.

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试验区	井号	煤层	深度/m	渗透率/10^-3μm²
亮山井田	Q1	12煤	1 135.8	0.006 220
		18煤	1 180.8	0.002 897
		24煤	1 245.0	0.002 380
	Q2	12煤	1 064.8	0.001 000
	Q2	15煤	1 084.0	0.009 560
	Q3	10煤	1 140.6	0.027 500
	Q3	17煤	1 170.4	0.003 680
金竹坪井田	G1	7煤	560.0	0.416 000
	G2	3煤		0.017 300
	G2	9煤		0.004 400

评价级别	煤层埋深/m	煤层累厚/m	含气量/（m³·t^-1）	R_o/%	压力系数	面积/km²	资源量/10⁸ m³
I₁	500~1 200	32.09~45.83	10~25	1.2~1.8	>1.1	60	108
I₂	500~1 200		10~20	0.9~1.2	0.8~1.1	82	132
II	>1 200		8~20	0.9~1.4		119	182