韩城矿区煤储层特征及煤层气资源潜力

doi:10.3969/j.issn.1672-7703.2017.06.009

摘要/Abstract

摘要： 为了加强韩城矿区煤层气资源的系统评价工作，以覆盖全区的煤层气探井获取的原始资料为基础，对韩城矿区地质条件、煤储层特征、煤层含气性等方面进行了研究，并运用逐步回归分析的数学方法建立了煤层气资源量的计算模型，最终对煤层气资源量进行计算。研究结果表明：该区主要的含煤地层为二叠系山西组和太原组，主力煤层3号、5号和11号煤层分布稳定，镜质组含量较高，煤变质程度高，吸附煤层气的潜力较大；影响煤层含气量的主控因素为埋藏深度、构造条件、水文地质条件、镜质组反射率、灰分含量、显微组分及盖层条件；煤层含气量较高且含气饱和度高，但煤层渗透率相对较低，小于0.5mD，后期开发需要加强对煤储层的改造。煤层气资源量预测结果表明：该区煤层气总资源量为858.25×10⁸m³，资源丰度为0.93×10⁸m³/km²，其中煤层埋深小于1200m的煤层气资源量为672.32×10⁸m³，资源丰度为1.08×10⁸m³/km²。

关键词: 煤层气, 含气量, 资源量, 变质程度, 勘探开发潜力, 韩城矿区

Abstract: To improve comprehensive evaluation of coalbed methane (CBM) resources in Hancheng mining area, the paper studied the geological conditions, coal reservoirs and gas-bearing properties of coal seams in Hancheng mining area based on the original data obtained from CBM wells distributed in the whole area, and established a calculation model using stepwise regression method, based on which calculated coalbed methane resources. The study results show that, in this area:(1) primary coal-bearing strata are the Permian Shanxi Formation and the Taiyuan Formation where No.3, No.5 and No.11 coal seams are primary and distributed stably, and show high vitrinite content, high metamorphism of coal, and great potential of adsorbed coalbed methane; (2) main controlling factors on gas content in the coal seams are buried depth, structure, hydrogeology, vitrinite reflectance, ash content, macerals and caprock; (3) both gas content and gas saturation are high, but the permeability of the coal seams are relatively low (<0.5 mD), which should be stimulated in later coal development. The prediction of coalbed methane resources in this area shows that the total CBM resource is 858.25×10⁸m³, and the resource abundance is 0.93×10⁸m³/km², of which, the coalbed methane resource in the coalbeds shallower than 1200 m is 672.32×10⁸m³, and the resource abundance is 1.08×10⁸m³/km².

Key words: coalbed methane, gas content, resource abundance, metamorphic degree, exploration and development potential, Hancheng mining area

中图分类号:

TE122.2

伊伟, 熊先钺, 卓莹, 季亮, 王客, 耿虎, 刘清. 韩城矿区煤储层特征及煤层气资源潜力[J]. 中国石油勘探, 2017, 22(6): 78-86.

Yi Wei, Xiong Xianyue, Zhuo Ying, Ji Liang, Wang Ke, Geng Hu, Liu Qing. Coal reservoirs and CBM potentials in Hancheng mining area[J]. China Petroleum Exploration, 2017, 22(6): 78-86.

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