焉耆盆地宝北地区高分辨率地震采集技术
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摘要
通过焉耆盆地宝北地区高分辨率地震采集试验和科学论证 ,总结出一套适合该地区的地震勘探采集方法 :1采用双井微测井技术查明虚反射界面 ,进而确定合适的激发井深 ;2采用小基线距、小组内距接收和适当小药量激发可有效地提高地震资料的分辨率 ;3采用自然频率相对较高和高灵敏度加速度检波器 ;4适当深埋检波器 (埋深 5 0～ 6 0 cm ) ,改善排列噪声环境 ,尽量减少与地表有关的噪声 ;5正确选择观测系统和仪器因素。采用上述采集方法 ,主要勘探目的层反射的视主频达到 6 0～ 80 H z;与以往常规地震剖面相比 ,分辨率提高了 2～ 3倍 ;断层、地层尖灭、不整合等地质现象更加清楚。
Through experiment and scientific proof of high-resolution seismic data acquisi tion techniques in Baobei area,Yanqi basin,the paper summed up a set of seism ic data acquisition measures suitable for the area:① adopting uphole survey i n double well to clarify the ghost reflector,then determining the suitable sho oting well depth;② adopting short group interval and short geophone interval for receiving and small charge size for shooting can effectively improve the res olution of seismic data;③ adopting accelerometer having relatively high natur al frequency and high sensibility;④ adequately deepening planted depth of geo phone (planted depth of 50~60 cm),improving noise environment of spread and doing our best to reduce the noise in relation to environment;⑤ correctly ch oosing geometry and apparatus factors.Adopting above-mentioned methods,the a pparent dominant frequency in major exploration targets can be 60~80 Hz;the resolution in creased 2~3 times as against former ordinary seismic section;the geologic features such as fault,pinch-out of formation and unconformity are m ore clear.
Through experiment and scientific proof of high-resolution seismic data acquisi tion techniques in Baobei area,Yanqi basin,the paper summed up a set of seism ic data acquisition measures suitable for the area:① adopting uphole survey i n double well to clarify the ghost reflector,then determining the suitable sho oting well depth;② adopting short group interval and short geophone interval for receiving and small charge size for shooting can effectively improve the res olution of seismic data;③ adopting accelerometer having relatively high natur al frequency and high sensibility;④ adequately deepening planted depth of geo phone (planted depth of 50~60 cm),improving noise environment of spread and doing our best to reduce the noise in relation to environment;⑤ correctly ch oosing geometry and apparatus factors.Adopting above-mentioned methods,the a pparent dominant frequency in major exploration targets can be 60~80 Hz;the resolution in creased 2~3 times as against former ordinary seismic section;the geologic features such as fault,pinch-out of formation and unconformity are m ore clear.
引文
[1] 李庆忠.走向精确勘探的道路.北京:石油工业出版社,1993
[2] 李忠.高分辨率地震勘探技术.北京:中国大地出版社,1997
[3] 俞寿朋.高分辨率地震勘探.北京:石油工业出版社,1993
[2] 李忠.高分辨率地震勘探技术.北京:中国大地出版社,1997
[3] 俞寿朋.高分辨率地震勘探.北京:石油工业出版社,1993
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