霍尔果斯复杂山地逆掩构造带勘探
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摘要
霍尔果斯逆掩构造带位于准噶尔盆地南缘北天山山前带。因该区地震地质条件极其复杂,虽经多年地震勘探,收效甚微。2003年在霍尔果斯地区开展的新一轮地震勘探攻关中,针对地表及地下构造复杂的特点,利用高精度卫星照片辅助采集方案设计,采用了灵活多变的观测系统、覆盖次数、激发方式、激发因素及适用的静校正方法等一整套新的勘探思路;并制定了一切从实际情况出发,以得到好的地震资料为目的的实施技术方案,收到了较好的效果。主要表现在:目的层反射能量强、信噪比高;断裂特征清晰,逆掩断面清楚;原霍尔果斯构造北翼地震资料空白区消失了,深浅层局部构造关系清楚。
Horgos overthrust structural belt is in piedmont of north Tianshan Mountain,south margin of Junggar basin. Although after many years' seismic exploration,the little effects are produced because of very complex seismic-geologic conditions in that region. In new round of tackling the key problems of seismic exploration developed in 2003 in Horgos region, according to the characters of complex near-surface and underground structures , we used high-precision-satellite-photo-aided design of acquisition scheme; adopted a new exploration ideas such as flexible and viriable geometry, fold,shooting pattern, shooting factor and adaptable static corrections methods; drew up technical operation scheme that proceeded from the practical situation and took acquiring good seismic data as an object, which resulted in good effects and mainly showed as follows:strong reflected energy and high S/N ratio at the targets; distinguished fault characters and overthrust plane;the blind zone in north flank of Hordos structure on the former seismic sections disappeared and clear relation between shallow and deep local structures appeared.
Horgos overthrust structural belt is in piedmont of north Tianshan Mountain,south margin of Junggar basin. Although after many years' seismic exploration,the little effects are produced because of very complex seismic-geologic conditions in that region. In new round of tackling the key problems of seismic exploration developed in 2003 in Horgos region, according to the characters of complex near-surface and underground structures , we used high-precision-satellite-photo-aided design of acquisition scheme; adopted a new exploration ideas such as flexible and viriable geometry, fold,shooting pattern, shooting factor and adaptable static corrections methods; drew up technical operation scheme that proceeded from the practical situation and took acquiring good seismic data as an object, which resulted in good effects and mainly showed as follows:strong reflected energy and high S/N ratio at the targets; distinguished fault characters and overthrust plane;the blind zone in north flank of Hordos structure on the former seismic sections disappeared and clear relation between shallow and deep local structures appeared.
引文
[1]陆基孟.地震勘探原理.东营:石油大学出版社,1993
[2]阎世信等.山地地球物理勘探技术.北京:石油工业出 版社,2000
[2]阎世信等.山地地球物理勘探技术.北京:石油工业出 版社,2000
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