多期构造运动对深部煤储层物性特征影响研究  

Study on impact of multi-period tectonic movement on deep coal reservoir physical properties

作　　者：韩文龙[1,2] 王延斌[2] 倪小明[3] 吴翔[4] 高向东[2] 张雨健[2] HAN Wenlong;WANG Yanbin;NI Xiaoming;WU Xiang;Gao Xiangdong;ZHANG Yujian(College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060;College of Geoscience and Surveying Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;China United Coalbed Methane Corporation Limited,Beijing 100011,China)

机构地区：[1]深圳大学土木与交通工程学院,广东深圳518060 [2]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [3]河南理工大学能源科学与工程学院,河南焦作454000 [4]中联煤层气有限责任公司,北京100011

出　　处：《煤炭科学技术》2021年第10期208-216,共9页Coal Science and Technology

基　　金：国家科技重大专项资助项目(2017ZX05064003-001,2016ZX05066001-002)。

摘　　要：煤的孔隙度、渗透率、裂缝和煤体结构等物性参数发育特征受控于构造及其演化特征。以沁水盆地南部柿庄地区为研究对象,基于野外节理和测井天然裂缝产状统计,利用节理(裂缝)的分期和配套、波叠加原理,对燕山期和喜山期构造应力场、构造形迹进行反演;通过地史最大构造曲率r表征了煤层在地质历史时期的变形程度,进而探讨了多期构造作用对煤储层物性的影响特征。研究结果表明:柿庄地区节理(裂缝)走向发育具有五个优势方向,分别为NNE向(10°~25°)、NEE向(45°~85°)、NWW向(85°~110°)、NW向(135°~145°)、NNW向(160°~175°);倾角较大,主要分布在50°~90°,且大于70°的高达76%。自晚古生代以来的燕山期NWW—SEE向挤压和喜山早期NWW—SEE向拉伸运动造成煤层底板形态复杂,煤层物性差异较大。地史最大变形程度控制着煤体真实的损伤程度,随着地史最大变形程度的增加,裂隙发育增多,煤体破碎程度增加,当r<48×10^(-6) m^(-1)时,发育原生结构煤;当48×10^(-6) m^(-1)<r<150×10^(-6) m^(-1)时,发育碎裂结构煤;当r>150×10^(-6) m^(-1)时,发育碎粒结构煤;糜棱结构煤基本不发育。在一定范围内,随地史最大变形程度的增加,煤储层渗透率呈现出先增大后减小的趋势,其界线值在r≈110×10^(-6) m^(-1)处;煤层的孔隙度多受埋深和应力特征控制,地史最大变形程度对其影响不明显。为多期构造活动对煤储层物理性质影响的研究提供了一种新方法,可望应用于柿庄区块及其他煤层气区块的储层物性评价及预测。The physical properties of coal reservoirs,i.e.,porosity,permeability,fractures,and coal structures,restrict the exploration and development of coalbed methane.The developmental characteristics of physical properties are controlled by the tectonic evolution process.Based on the occurrence statistics of field joints and natural fractures from loggings,using staging and matching of joints(cracks)and wave superposition principle,the tectonic stress field and structural features of Yanshanian period and Himalayan period are inversed in the Shizhuang area of southern Qinshui Basin.The deformation degree of the coal seam in geological history period was characterized through the largest tectonic curvature(r),and the influence on coal reservoir physical properties of multi period tectonic activities was discussed.Research has shown that the joint(fracture)trend has five advantageous directions,which are NNE(10~25 degrees),NEE(45~85 degrees),NWW(85°~110°),and NW(135°~145°),NNW direction(160°~175°).The inclination angle is large,mainly distributed between 50°~90°,and it is 76%greater than 70°.Since the late Paleozoic,the NWW-SEE trend in the Yanshanian and NWW-SEE-di⁃rection tensile stress in the early Xishantectonic movement has caused the complex shape of the coal seam floor.The physical properties of the coal seam were quite different.The maximum deformation degree of the earth's history controls the actual damage degree of the coal body.With the increase of history's largest deformation degree,fractures and the broken degree of coal increased.When r<48×10^(-6) m^(-1),primary structural coals were developed;when 48×10^(-6) m^(-1)<r<150×10^(-6) m^(-1),cataclastic coals were developed;when r>150×10^(-6) m^(-1),granulated coals were developed;mylonite coals were barely developed.With the increase of the historical maximum deformation degree in a certain range,coal reservoir permeability shows a trend of increasing first and then decreasing.Its boundary value is 110×10^(-6) m^(-1).The porosity of coal seams

关 键 词：沁水盆地 柿庄区块 构造运动 构造行迹恢复 煤储层物性 

分 类 号：TD618.11[矿业工程—矿山机电]