唐山断裂带气体组分变异函数空间分布特征

doi:10.12196/j.issn.1000-3274.2022.01.002

摘要/Abstract

摘要： 气体是识别构造带展布和活动的敏感组分。对唐山断裂带高空间分辨率气体地球化学测量数据进行了变异函数计算, 分析了断裂带活动性与断裂带气体浓度的定量关系。结果表明, 断裂带本身结构特性是控制断裂带气体空间分布的主要因素, 高倾角断裂在地表以狭长条带状为主要特征, 分布气体浓度高值异常, 交会处气体浓度高值异常以环带形式围绕断裂分布。沿断裂带走向, 各气体浓度呈高值分布, 利用变异函数计算, 确定各气体组分在测量区域内气体浓度与构造相关的空间范围, 据此确定了唐山断裂各段构造敏感气体组分, 在断裂带周边圈定出断裂带活动性重点监测区域。断裂带气体浓度克里金插值分析结果表明, 唐山地区滦县—乐亭断裂带活动性较强, 唐山断裂带次之, 蓟运河断裂带活动性最弱。断裂带交会处, 浓度高值异常分布更加明显。

关键词: 断裂带气体, 地球化学, 变异函数, 空间分布, 相关性

Abstract: Gas is the sensitive component for identifying distribution and activity of tectonic zones. In this paper, the variogram method was employed to calculate the spatial high resolution data of gas geochemistry in the Tangshan fault zones and to analyze the quantitative relationship between the activities of fault zones and the concentration of fault zone gas. The results indicate that the structural characteristic of the fault zones is the major factor influencing the spatial distribution of fault zone gas among gaseous resources, meteorological-hydrological conditions and carrier gas etc., high-dip faults encompass the main anomalous high gas distribution with a form of narrow ribbon on the surface, anomalous annular connection areas are formed in the intersection area of fault zones. Along strike direction, fault zone gas with anomalous high concentration is congruent with tectonic lines. By means of the variogram, the correlation domain between gas concentration and tectonics is determined, thus the tectonic sensitive gas is determined in each segment of Tangshan faults, around fault zones, and the key monitoring area of fault activities can be designated. The Kriging interpolation plots of fault zone gas illustrate that the Luanxian—Laoting Fault is the most active fault, the Tangshan Fault is second, the Jiyunhe Fault is relatively stable. In the converged area, fault zone gas shows more sharply anomalous high concentrations.

Key words: Fault zone gas, Geochemistry, Variogram, Spatial distribution, Correlation

中图分类号:

P315.7

赵元鑫, 李营, 陈志, 路畅, 刘兆飞. 唐山断裂带气体组分变异函数空间分布特征[J]. 地震, 2022, 42(1): 18-32.

ZHAO Yuan-xin, LI Ying, CHEN Zhi, LU Chang, LIU Zhao-fei. The Spatial Characteristics of Gas Composition Variogram in the Area of Tangshan Fault Zones[J]. EARTHQUAKE, 2022, 42(1): 18-32.

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