小板凹陷二维地震资料采集方法
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摘要
小板凹陷工区内大面积的禁炮区给地震施工带来了很大的困难,为保证剖面缺口不会太大,浅层地震资料不会缺失,深层覆盖次数均匀,针对性地采取了在汉江、天门河和汉北河放水炮的方法,弥补浅层资料,缩小剖面缺口;在测线穿越大堤平行段,采取测线拐角的方法保证满覆盖段;在大面积村庄和障碍物段,采取变观措施保证深层覆盖次数均匀;逐点踏勘,优选大药量激发点,保证激发效果。所得现场处理剖面目的层反射特征明显,各反射层所含地质信息丰富;浅、中、深层反射连续,基本构造形态清楚。
Extensive shooting-banned range in Xiaoban depression area brings a lot of difficulties to seismic acquisition.To make sure that profile notch will not be too big,that the loss of shallow seismic data will not occur and deep coverage of fold will be well-distributed,several acquisition methods have been adopted accordingly: source is fired underwater in Han River,Tianmen River and Hanbei River to make up shallow recording and to narrow profile notch;survey lines go around corner when crossing parallel section of levee to obtain full coverage;undershooting spread is adopted in the big village and barrier section to make deep multiplicity well-distributed;scouting point by point and optimizing shooting spot of large dose of dynamites satisfy the shooting effect.By means of the methods above,reflectance signature of profile target layer processed on spot is obvious;geological information contained in each reflecting layer is abundant;reflection is continuous in superficial,central and deep layer and their basic structural forms are clear.
Extensive shooting-banned range in Xiaoban depression area brings a lot of difficulties to seismic acquisition.To make sure that profile notch will not be too big,that the loss of shallow seismic data will not occur and deep coverage of fold will be well-distributed,several acquisition methods have been adopted accordingly: source is fired underwater in Han River,Tianmen River and Hanbei River to make up shallow recording and to narrow profile notch;survey lines go around corner when crossing parallel section of levee to obtain full coverage;undershooting spread is adopted in the big village and barrier section to make deep multiplicity well-distributed;scouting point by point and optimizing shooting spot of large dose of dynamites satisfy the shooting effect.By means of the methods above,reflectance signature of profile target layer processed on spot is obvious;geological information contained in each reflecting layer is abundant;reflection is continuous in superficial,central and deep layer and their basic structural forms are clear.
引文
[1]李庆忠.走向精确勘探的道路-高分辨率地震勘探系统工程剖析[M].北京:石油工业出版社,1993.
[2]俞寿朋.高分辨率地震勘探[M].北京:石油工业出版社,1993.
[2]俞寿朋.高分辨率地震勘探[M].北京:石油工业出版社,1993.
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