Analyses on integrated geophysical logging results in shallow hole across the Anninghe fault zone
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摘要: 利用综合地球物理测井技术测得跨川西安宁河断裂带冕宁—西昌段两个钻孔的电阻率、声波速度、自然电位、自然伽马等4种综合测井曲线，并结合钻孔取芯资料得到了钻孔周围所钻遇岩土层的综合物性参数．本文得到的综合测井解释成果客观真实地反映了安宁河断裂带东、西两盘的介质物性和岩性特征，揭示了断层东、西两盘地层的纵波速度变化、视电阻率值等物性变化特征，为研究安宁河断裂带的物质组成、介质物性、断层结构及其活动状态提供了基础资料．综合地球物理测井技术有望成为监测活动断裂带附近介质物性参数动态变化的一种新手段．Abstract: Using the integrated geophysical logging technique, we measured resistivity, sonic velocity, spontaneous potential and natural gamma logs of two wells which were located in Mianning-Xichang segment of Anninghe fault in western Sichuan, and obtained the integrated physical parameters combining with coring data drilled around the drilled rock layer. The integrated logging interpretation results reflect the physical properties and lithological characteristics of the east and west sets of the Anninghe fault zone objectively, and reveal the physical properties variation of the P-wave velocity and the apparent resistivity of the fault zone, providing the basic data for research on material composition, media properties, structure and active state of the fault zone. Integrated geophysical logging technology is expected to become a new mean of monitoring dynamic variation of physical parameters near active fault zones.
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图 2 钻孔ZK01测井曲线综合解释成果图
Figure 2. Comprehensive interpretation results of borehole ZK01 loggings curves
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图 3 钻孔ZK02测井曲线综合解释成果图
Figure 3. Comprehensive interpretation results of borehole ZK02 loggings curves
表 1 测井方法及其技术参数
Table 1 Logging methods and their technical parameters
方法 物性参数 目的 技术参数 声测井 vP 测定岩层的纵波速度，划分断层破碎带范围，确定断层附近岩层性质 Ls=0.5 m Lv=0.2 m 核测井 自然伽马 划分钻孔地层剖面，了解孔内放射性物质的赋存情况 采样间隔为0.1 m 提升速度：v≤6.0 m/min 电测井 三侧向电阻率 岩层定性、定厚，划分钻孔剖面，确定破碎带 Ap0.01Ao0.01Ap Ao=0.05 m 自然电位 了解自然电场分布，划分地层剖面 M∞N 注：vP为纵波速度；Ls为声波探管源距，即激发晶体到第一接收晶体的距离；Lv为声波探管间距，即两个接收晶体之间的距离；Ap为三侧向电阻率探管屏蔽电极；Ao为三侧向电阻率探管中心电极；M为地面电极，N为井中电极． 
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表 2 钻孔ZK01综合测井解释成果表
Table 2 Integrated logging interpretation results of the borehole ZK01
地层代号 底板井深/m 层厚/m 岩性 物性参数 vP/(km·s-1) 围岩分级 异常解释 视电阻率/(Ω·m) 自然伽马值/(γ·cm-1) 极小值 极大值 一般值 采用值 极小值 极大值 一般值 极小值 极大值 一般值 1 20.0 套管 水位 2 32.8 12.8 粗砂 33 66 51 35.3 155.4 122.3 0.98 2.53 1.86 1.58 Ⅳ 破碎 3 42.6 9.8 粉质黏土 28 44 31 20.2 116.8 77.2 1.11 2.23 1.82 1.55 Ⅳ 破碎 4 96.7 54.1 页岩 18 37 29 1.6 45.5 24.4 1.74 1.96 1.85 1.57 Ⅳ 破碎 5 106.2 9.5 砂岩 36 47 41 3.1 36.9 18.7 1.93 2.67 2.53 2.15 Ⅳ 较破碎 6 110.0 3.8 页岩 23 38 29 2.7 47.9 31.6 1.87 3.02 2.61 2.21 Ⅳ 较破碎
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表 3 钻孔ZK02综合测井解释成果表
Table 3 Integrated logging interpretation results of the borehole ZK02
地层代号 底板井深/m 层厚/m 岩性 物性参数 vP/(km·s-1) 围岩分级 异常解释 视电阻率/(Ω·m) 自然伽马值/(γ·cm-1) 极小值 极大值 一般值 采用值 极小值 极大值 一般值 极小值 极大值 一般值 1 11.0 水位 水位 2 20.1 9.1 粉质黏土 1 400 178 77.1 153.4 149.3 3 30.0 9.9 卵石土 103 264 183 107.2 166.8 137.2 4 51.1 21.1 粉砂 105 187 143 67.6 105.5 81.4 1.71 3.16 2.05 1.74 Ⅳ 破碎 5 63.8 12.7 粉质黏土 86 147 128 66.1 96.9 78.7 1.03 3.87 1.93 1.64 Ⅳ 破碎 6 74.9 11.1 粉土 92 400 223 72.3 167.7 92.2 1.11 5.85 1.94 1.65 Ⅳ 破碎 7 77.3 2.4 漂石土 102 153 126 89.9 138.1 100.5 1.13 5.25 2.11 1.79 Ⅳ 破碎 8 87.4 10.1 泥岩 97 143 112 63.1 94.2 72.8 1.84 2.16 1.95 1.65 Ⅳ 破碎 9 88.6 1.2 砂岩 106 197 168 92.1 156.2 118.4 1.89 2.07 1.93 1.64 Ⅳ 破碎 10 111.0 22.4 粉砂质泥岩 95 241 158 61.5 299.4 94.1 1.73 2.16 1.96 1.66 Ⅳ 破碎
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