老堡南地区海底电缆采集方法

Ocean Bottom Cable (OBC) acquisition method in southern Laopu area

韩立强 ,全海燕 .老堡南地区海底电缆采集方法 .石油地球物理勘探 ,2 0 0 3,38(3) :2 2 6～ 2 30 老堡南地区为冀东油田和海洋区块的交界地带 ,以往得到的均是二维资料 ,无法完成对该地区的构造解释 ,而距本区最近的三维采集工作是 2 0 0 0年阿吉普公司在本区西侧进行的。根据老资料以及实地踏勘的结果 ,发现本区存在影响采集资料质量的三个技术难点 :1断裂发育 ;2馆陶组火成岩多次波发育 ;3水深变化大。因此在三维勘探中采取了以下技术对策 :1利用海底电缆进行 PATCH宽方位采集 ;2不同地区选取适宜的震源 ;3利用海底电缆初至波二次定位技术 ;4合理利用三维恢复性炮点。本文的目的在于总结本区的勘探经验 ,同时提高对海底电缆勘探技术的认识。

The southern Laopu area is transitional zone of Jidong Oilfield and offshore block,the precious data are always the 3 D seismic data,being unable to finish structural interpretation in that area.The recent 3 D seismic acquisition is in the west of the region in 2000 by AGIP Company.There exist following difficulties according to legacy data and field investigation:①fracture development;②multiple development in igneous rock of Ng Formation;③rapid water depth variation.This 3 D seismic exploration is carried out in view of these problems,effectively solved the above mentioned problems.The adopted measures are as follows: ①using OBC for PATCH wide azimuth acquisition; ②appropriate sources being chosen in different areas; ③using first break of OBC for second positioning;④reasonably using 3 D recoverable shot points.The aim of the paper lies in summarizing the experiences of the exploration and improves the knowledge of OBC exploration technique at the same time.