青藏高原北部和东部含油气盆地同震热红外亮度异常模拟

IF 2.9 3区 地球科学 Earth and Planetary Physics Pub Date : 2020-06-08 DOI:10.26464/epp2020029
Xin Zhang, LiFeng Zhang
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引用次数: 0

摘要

同震气体泄漏通常发生在含油气盆地地震断层边缘,可能对当地环境产生温室效应等影响,导致热红外亮度异常。利用小波变换和功率谱估计方法,对中国同步气象卫星FY-C/E的亮度温度数据进行了处理。本文报道了中国西部青藏高原北部和东部的四川、塔里木、柴达木和准噶尔盆地边缘地震前后同震热红外亮度(CTIB)异常的相似性。在各含油气盆地中,单个CTIB异常面积占盆地面积的50% ~ 100%,且在地震前、地震中、地震后CTIB异常空间分布具有相似性。为了更好地解释这些相似性,我们建立了一个基于地质构造和地形的盆地增温效应模型。该模型表明,在具有地下气藏的含油气盆地中,地震前、地震中甚至地震后应力的增加会加剧天然气泄漏。这些气体,如温室气体CH4和CO2的积累,导致CTIB异常。此外,盆地周围高山(海拔~5000 m)和盆地独立的气候条件加强了CTIB异常。本研究为认识青藏高原北部和东部含油气盆地的CTIB异常提供了新的视角。
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Modeling co-seismic thermal infrared brightness anomalies in petroliferous basins surrounding the North and East of the Qinghai–Tibet Plateau

Co-seismic gas leakage usually occurs on the edge of seismic faults in petroliferous basins, and it may have an impact on the local environment, such as the greenhouse effect, which can cause thermal infrared brightness anomalies. Using wavelet transform and power spectrum estimation methods, we processed brightness temperature data from the Chinese geostationary meteorological satellite FY-C/E. We report similarities between the co-seismic thermal infrared brightness (CTIB) anomalies before, during and after earthquakes that occurred at the edges of the Sichuan, Tarim, Qaidam, and Junggar basins surrounding the North and East of the Qinghai–Tibet Plateau in western China. Additionally, in each petroliferous basin, the area of a single CTIB anomaly accounted for 50% to 100% of the basin area, and the spatial distribution similarities in the CTIB anomalies existed before, during and after these earthquakes. To better interpret the similarities, we developed a basin warming effect model based on geological structures and topography. The model suggests that in a petroliferous basin with a subsurface gas reservoir, gas leakage could strengthen with the increasing stress before, during, and even after an earthquake. The accumulation of these gases, such as the greenhouse gases CH4 and CO2, results in the CTIB anomalies. In addition, we conclude that the CTIB anomalies are strengthened by the high mountains (altitude ~5000 m) around the basins and the basins’ independent climatic conditions. This work provides a new perspective from which to understand the CTIB anomalies in petroliferous basins surrounding the North and East of the Qinghai–Tibet Plateau.

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Earth and Planetary Physics
Earth and Planetary Physics GEOSCIENCES, MULTIDISCIPLINARY-
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17.20%
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