Attenuation Field in the Fergana Petroleum Basin and Its Correlation with Other Geophysical Fields and Seismicity

IF 0.3 Q4 GEOCHEMISTRY & GEOPHYSICS Seismic Instruments Pub Date : 2022-04-21 DOI:10.3103/S0747923922020037

O. I. Aptikaeva

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Abstract

The characteristics of the attenuation of seismic coda waves in the Fergana Basin are studied. The study analyzes short-period coda waves of local earthquakes recorded by frequency-selective seismic stations in 1960–1984 and digital seismograms of more than 100 earthquakes that occurred in the Fergana Basin from 2005 to 2021 and were recorded by the stations of the KNET network. Detailed analysis of variations in the attenuation field within the Fergana Basin showed that it is characterized by a mosaic structure that changes with depth. This attenuation field structure is consistent with the structure of the velocity field obtained by seismic tomography, as well as with the conclusions drawn from analysis of the density model. The features of the seismicity distribution relative to the position of blocks and weakened zones at different depths are considered. The correlation between contrasting objects of the attenuation field in the Fergana Basin and objects in the pre-Mesozoic strata of contrasting petrophysical characteristics has been revealed. Oil and gas fields in the Fergana Basin are associated with zones of strong attenuation, which are probably conduits for migration of fluids, including hydrocarbons. A possible explanation is also considered for the increased sensitivity of the atmospheric baric field near the Namangan hydrometeorological station to processes associated with preparation and occurrence of significant seismic events here.

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费尔干纳盆地衰减场及其与其他地球物理场和地震活动性的相关性

研究了费尔干纳盆地地震尾波的衰减特征。本研究分析了1960—1984年频率选择地震台站记录的局部地震短周期尾波和2005—2021年KNET台站记录的费尔干纳盆地100多次地震的数字地震记录。对费尔干纳盆地衰减场变化的详细分析表明，盆地衰减场具有随深度变化的马赛克结构特征。这种衰减场结构与地震层析成像得到的速度场结构以及密度模型分析得出的结论一致。考虑了不同深度地震活动性分布与块体和弱带位置的关系。揭示了费尔干纳盆地衰减场对比对象与前中生代岩石物性对比对象之间的相关性。费尔干纳盆地油气田与强衰减带有关，这些衰减带可能是包括烃类在内的流体运移的通道。还考虑了Namangan水文气象站附近大气气压场对此处重大地震事件的准备和发生过程的敏感性增加的一个可能的解释。

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来源期刊

Seismic Instruments GEOCHEMISTRY & GEOPHYSICS-

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期刊介绍： Seismic Instruments is a journal devoted to the description of geophysical instruments used in seismic research. In addition to covering the actual instruments for registering seismic waves, substantial room is devoted to solving instrumental-methodological problems of geophysical monitoring, applying various methods that are used to search for earthquake precursors, to studying earthquake nucleation processes and to monitoring natural and technogenous processes. The description of the construction, working elements, and technical characteristics of the instruments, as well as some results of implementation of the instruments and interpretation of the results are given. Attention is paid to seismic monitoring data and earthquake catalog quality Analysis.