安阳矿区双全井田煤层气可采潜力分析

An analysis of the production potentials of CBM in Shuangquan mine area of Anyang Coalfield

河南省安阳矿区双全井田有望成为豫北地区煤层气开发的理想靶区。在分析双全井田地质背景的基础上,重点系统计算、分析了影响该区煤层气可采潜力的煤层气可采资源量,储层能势和渗流能力3个因素。结果显示:①双全井田煤层气地质资源量为为35×108m3,可采资源量为19×108m3,可采资源丰度为0.89×108m3/km2,具有资源量大的特点;②煤层气压力状态接近正常,煤层气含气饱和度高,平均为86.26%,有望成为高产气田;③渗透率极差是制约该区煤层气开采的最为不利因素,但该区具有成煤时代多,煤层分布范围广,厚度大,含气量高等有利条件,在一定程度上可以弥补煤层渗透率低的缺陷。结论认为:双全井田具有很好的煤层气开发潜力。

The Shuangquan mine area of Anyang coalfield is expected to become an ideal target area of CBM exploration in northern Henan Province.On the basis of analyzing the geologic settings in the study area,this paper focuses on 3 major factors influencing the production potentials of CBM,namely recoverable CBM resources volume,reservoir energy and flow capability.The following results are obtained.①The gas-in-place is 3.5 bcm,recoverable reserve is 1.9 bcm,and the abundance of recoverable resources is 89 mcm/km2 in the study area,indicating the resource volume is large.②The pressure of gas reservoir is near normal,and gas saturation of CBM is high with 86.26% on average,being favorable for recovery.③Although the very low permeability is unfavorable for recovery,several favorable factors,such as multiple coal-forming times,extensive distribution of coal layers,large thickness of coal bed,and high gas content,can compensate the negative influences of low permeability to some extent.Therefore,it is believed that the production potentials of CBM is high in the Shuangquan mine area.