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宽方位地震勘探技术新进展

Keywords: 宽方位,观测系统,ovt,方位各向异性,裂缝预测

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Abstract:

?本文从地震采集、处理和解释三个方面总结了宽方位地震勘探目前所取得的进展,分析了目前存在的问题,并对发展方向作了预测,得出以下认识:1宽方位地震采集的核心理念是如何经济可行地获取宽方位数据体,陆上多采用可控震源高效激发实现,螺旋采集技术结合震源同步激发技术可进一步提高海上采集效率,降低勘探成本;2炮检距向量片(ovt)技术是面向宽方位地震资料处理的一项新技术,考虑了宽方位观测带来的方位各向异性问题,有利于提高地震成像精度,同时在处理过程中可以保留炮检距和方位角信息,有望在复杂构造地震成像和储层描述中发挥更大作用;3在hti介质中地震波能量衰减方位各向异性程度较其他属性要明显,且对裂缝尺度和流体类型敏感,今后业界将应更加关注综合利用地震波能量衰减、频率、相位方位各向异性提高裂缝预测精度;4宽方位地震观测在高陡构造和复杂断块成像、岩性和裂缝型储层预测等方面具有明显优势并已得到实践检验,但对于诸如复杂山地等地表起伏剧烈、速度纵横向变化大、静校正问题严重的地区,在相关处理技术未完善的情况下,应慎用宽方位地震观测。

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