依据二维叠偏剖面编制构造图的空校原理  

Principle of spatial correction for structure mapping on 2-D migration section

作　　者：臧明福[1] 邹洪学[1] 付连义[1] 

机构地区：[1]辽河油田勘探开发研究院计算所,辽宁盘锦124010

出　　处：《石油物探》2003年第1期107-110,125,共5页Geophysical Prospecting For Petroleum

摘　　要：以连续介质为主 ,以单斜构造为模型 ,结合具体的测算结果 ,论证了在空间域中 ,反射点三维空间偏移量的二维分量与二维偏移量是相等的。在时间域中 ,在非倾向方向上存在二维偏移量偏大 ,倾角偏缓 ,二维深度偏浅等偏差 ,与空间域的结论相矛盾。通过论证分析表明 ,现有的方法与公式只适用于倾向方向 ,不适用于非倾向方向。在没有二维偏移偏差的条件下 ,根据二步法空校原理及其关系 ,建立起新的改进算法 ,不但改正了偏差 ,也证明了在时间域中 ,反射点的三维偏移量的二维分量与二维偏移量是相等的 。This paper proved that the 2 D component of a 3 D migration offset at a reflection point is equal to the amount of 2 D offset, in case of continuous medium and monoclinal structure. There are deviations in direction of non inclination in time domain, such as bigger 2 D migration offset, gentler inclination, shallower depth, etc. Therefore, contradiction exists between results from time domain and space domain. Analysis shows that existing methods are applicable only in inclination direction. A new algorithm was developed according to principle of spatial correction in two pass, provided that 2 D migration offset is zero. Tests with real data show that the method yields no deviation. Thus it confirms that the 2 D component of a 3 D migration offset at a reflection point is equal to the amount of 2 D offset. The result can be used as evidence of correct mapping.

关 键 词：叠偏剖面 时间域 构造图 成图方法 单斜构造 空间域 改正 二维 分量 相等 

分 类 号：TE132[石油与天然气工程—油气勘探] P631[天文地球—地质矿产勘探]