新疆准南煤田乌鲁木齐河东矿区大倾角低阶煤储层渗透率分布特征  

Permeability Distribution Characteristics of Low-rank Coal Reservoir with Large Dip Angle in Urumchi Hedong Mining Area of Zhunan Coalfield,Xinjiang

作　　者：赵琛 ZHAO Chen(No.156 Exploration Team of Xinjiang Bureau of Coalfield Geology,Xinjiang 830000)

机构地区：[1]新疆煤田地质局一五六煤田地质勘探队,新疆830000

出　　处：《中国煤层气》2023年第2期8-12,共5页China Coalbed Methane

摘　　要：新疆准噶尔盆地南缘乌鲁木齐河东矿区处于勘探开发早期阶段,为了分析该区煤层渗透率分布差异性,以研究区煤储层试井渗透率为基础数据,分析大倾角煤层中渗透率分布特征及其影响因素。结果表明:随着煤层埋深的增大储层压力和地应力均逐渐增大,但是地应力增大的幅度大于储层压力导致储层有效应力逐渐增大。随着储层有效应力的逐渐增大,渗透率呈现出缓慢下降的趋势。以埋深500m为分界点,渗透率变化规律大致可以分为快速下降区和缓慢下降区,且随着埋深逐渐增大渗透率应力敏感性逐渐降低。Urumqi Hedong Mining Area in the southern margin of Xinjiang Junggar Basin is in the early stage of exploration and development.To analyze the difference in permeability distribution of the coal seam in this area,based on the permeability data of the coal reservoir well test in the study area,the permeability distribution characteristics and its influencing factors in large dip angle coal seam are analyzed.The results show that the reservoir pressure and in-situ stress increase gradually with the increase of the burial depth of the coal seam,but the amplitude of in-situ stress increase is greater than that of reservoir pressure,which leads to the gradual increase of reservoir effective stress.With the increase of reservoir effective stress,permeability shows a slow downward trend.Taking the buried depth of 500m as the cutoff point,the permeability variation law can be roughly divided into the rapid decline zone and the slow decline zone,and the permeability stress sensitivity gradually decreases with the increase of the buried depth.

关 键 词：煤层气 河东矿区 含气性 西山窑组 

分 类 号：P618.13[天文地球—矿床学]