泌阳凹陷新庄地区高密度三维地震资料采集方法研究  

Study on 3-D high-density seismic data acquisition in Xinzhuang area,Biyang Depression

作　　者：张付生[1] 马义忠[1] 王帮助[1] 陈亚强[1] 

机构地区：[1]中国石油化工股份有限公司河南油田分公司勘探事业部,河南南阳473132

出　　处：《石油物探》2009年第6期615-620,共6页Geophysical Prospecting For Petroleum

摘　　要：泌阳凹陷新庄地区地下地质构造复杂,目的层埋藏较浅,断裂发育,圈闭破碎,以往的地震资料难以满足油气勘探和开发的需要,为此,开展了高密度三维地震资料采集方法研究。首先基于正演模型对观测系统参数进行了分析和论证,然后根据论证结果和勘探目的层的实际情况设计了小道距、小炮点距、小接收线距和小激发线距的观测系统,该观测系统的特点是物理点密度较大、覆盖次数高、炮检距分布均匀。在泌阳凹陷新庄地区,采用高密度采样、连续采样和对称采样相结合的方法进行了三维地震数据采集,获得了品质良好的地震剖面,与老资料相比,新资料的信噪比和分辨率明显提高,主频由30 Hz提高到45 Hz,频带宽度拓宽了15 Hz,层间信息丰富。Xinzhuang area in Biyang Depression is characterized by complex subsurface geologic structures,shallow buried target formations, developed faults and faulted traps,the former seismic data can not satisfy the requirements of hydrocarbon exploration and development. Aiming at the problem,3-D high-density seismic data acquisition method was studied.Firstly,the geometry parameters were analyzed based on forward model.Then,in terms of argument results and the actual conditions of exploration targets,geometry was designed with small receiver distance,small shot point distance, small receiver line interval and small shot line interval,which are characterized by high density physical points,high fold,and uniform shot-receiver distance.In Xinzhuang area of Biyang Depression, high-density sampling,continuous sampling and symmetric sampling were jointly used to acquire 3 D seismic data.Good quality seismic profile was obtained,which had obvious improvements in S/ N and resolution compared to that of old seismic data,the dominant frequency was raised from 30 Hz to 45 Hz,frequency bandwidth was widened 15 Hz.information between layers was abundant.

关 键 词：泌阳凹陷 高密度三维地震数据采集 观测系统设计 参数论证 对称采样 成像精度 双聚焦 

分 类 号：P631.4[天文地球—地质矿产勘探]