文章摘要
王晓东.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[J].地质与勘探,2024,60(3):530-538
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
Geophysical response and key parameters of seismic acquisition in the steep zone of the Erlian graben basin in Inner Mongolia
投稿时间:2024-03-07  修订日期:2023-04-16
DOI:10.12134/j.dzykt.2024.03.008
中文关键词: 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
英文关键词: graben basin, steep zone, coarse debris, geophysical response, seismic acquisition, Erlian graben basin, Inner Mongolia
基金项目:中石油东方物探公司科研项目“地震采集方法基础研究”(编号:03-01-2022)资助
作者单位E-mail
王晓东 中国石油集团东方地球物理公司河北任丘 中国石油集团华北油田公司研究院河北任丘中国石油集团东方地球物理公司河北涿州 中国石油大学(北京)地球物理学院北京 32569442@qq.com 
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中文摘要:
      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。
英文摘要:
      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 conduced 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, relatively moderate binning, 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.
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