江陵凹陷金家场地区复杂水网三维地震勘探特色技术研究与应用

Application of 3D Seismic Prospect in Jinjiachang with Complex Water Network in Jiangling Depression

江陵凹陷金家场地区属典型的江汉平原水网地形,受长江及其堤防禁炮区范围制约,存在大面积的空道空炮区,导致地震资料采集不完整,造成中深层成像效果差,无法有效识别薄砂岩储层,严重制约了江陵凹陷金家场地区的勘探进展。采用多种震源联合激发、以道补炮、以炮补道、变线改桩等技术手段,来克服复杂地表对地震资料的影响,通过对多种震源的激发一致性进行分析,提出提高一致性处理效果的关键处理步骤,取得了良好的采集效果,满足了构造精细解释、火成岩及薄砂岩储层精细刻画的需求。

Jinjiachang in Jiangling depression is a typical water net landform Jianghan plain possesses. Restrictions of firing forbidden range of Yangtze River as well as its dike make it impossible to arrange a large area of recording traces and shots in Jinjiachang, resulting in incomplete seismic data acquired, poor imaging effect of mid--deep layers and insufficient recognition of thin ,sandstone reservoir. To remove the impact of complex surface on seismic data, it is necessary to adopt technological means of joint multi--sources shooting, combination of trace and shot as well as replacement of lines by stakes. On the basis of uniformity analysis of multi--sources shooting, this paper introduces key processing steps to the improvement of uniformity processing. They have met the needs for structural fine interpretation and fine depiction of volcanic rock reservoir and thin sandstone reservoir.