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内蒙古二连断陷盆地陡带区地球物理响应及地震采集关键参数研究OA北大核心CSTPCD

Geophysical Response and Key Parameters of Seismic Acquisition in the Steep Zone of the Erlian Graben Basin in Inner Mongolia

中文摘要英文摘要

断陷盆地陡带区多沉积于湖盆的边界同生断层一侧,具有山高坡陡、近物源、沉积速度快的特点,多发育有冲积扇、近岸水下扇或扇三角洲,在地震相上多表现为楔形杂乱相、楔形空白相.本文所述内蒙古二连断陷盆地探区的陡带区沉积大量厚度大、延伸长、无分选的粗细混合碎屑物质,造成地震资料存在能量弱、信噪比低、成像差的问题.为有效改善陡带区地震资料品质难以满足地质需求的问题,本文在对大量陡带区地震资料的分析,在充分分析陡带区沉积模式基础上完成了断陷盆地陡带区地球物理建模以及地球物理响应论证.认为大量的粗碎屑物质未经分选、快速沉积是导致断陷盆地陡带区地震采集资料反射能量弱、资料信噪比低、成像困难的直接原因.据此,通过充分的理论论证、模拟以及实际资料验证,推荐断陷盆地陡带区地震资料采集时采用较高的覆盖次数、相对适中的面元、较宽方位和适宜的炮检距.该成果可为类似地区的地震勘探提供参考借鉴.

The steep zone of graben basins was mostly deposited on the same fault side of the boundary of lake basins,with the characteristics of high mountains,steep slopes,near sediment sources,and fast sedimentation rate.It is often developed with alluvial fans,nearshore underwater fans,or fan deltas.In seismic facies,it is often manifested as wedge-shaped chaotic facies and wedge-shaped blank facies.The steep zone of the Erlian graben basin exploration area in Inner Mongolia described in this article is characterized by weak energy,low signal-to-noise ratio,and poor imaging in seismic data due to the deposition of a large amount of thick,elongated,and unsorted mixed debris material.In order to effectively improve the quality of seismic data in steep zone that cannot meet geological needs,this work analyzed a large amount of seismic data in steep zone,and conducted geophysical modeling and geophysical response verification of steep zone in the graben basin based on a thorough analysis of sedimentary patterns in these areas.It is believed that the lack of sorting and rapid sedimentation of a large amount of coarse debris material are the direct reasons for the weak reflection energy,low signal-to-noise ratio,and difficult imaging of seismic data in steep zones of the graben basin.Based on this,through sufficient theoretical argumentation,simulation,and actual data verification,it is recommended to use greater coverage times,suitable bin,wider azimuth,and appropriate offset for seismic data acquisition in steep zones of graben basins.This study can provide reference for seismic exploration in similar regions.

王晓东;李海东;杨蕾;付滨;陈敬国;王金宽;田煜

中国石油集团东方地球物理公司,河北沧州 062550中国石油集团华北油田公司研究院,河北沧州 062550中国石油集团东方地球物理公司,河北涿州 072751||中国石油大学(北京)地球物理学院,北京 102249

地质学

断陷盆地陡带区粗碎屑地球物理响应地震采集二连断陷盆地内蒙古

graben basinsteep zonecoarse debrisgeophysical responseseismic acquisitionErlian graben basinInner Mongolia

《地质与勘探》 2024 (003)

530-538 / 9

中石油科研课题"物探技术与装备标准化测试平台研究"(编号:02-03-2023)资助.

10.12134/j.dzykt.2024.03.008

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