构造畸变条件下低幅构造评价技术研究

Research on Low Amplitude Structure under Structural Distortion Conditions

摘要: 针对南海东部油田低幅构造存在的畸变问题，包括浅层气、断层阴影、局部含钙导致的横向变速问题等等，提出了相应的解决方法。通过模型正演，落实浅层气和断层对地震反射的影响；通过地质统计学反演，精细合理定量的描述钙质分布，并用反演的阻抗体转换成速度体进行时深转换以消除地层含钙的影响；以上技术手段有效的解决了低幅构造畸变的问题，在其它油气田具有较好的推广价值。

Abstract: For the structural distortion problems of Southeast China Sea oilfields, including factors like shallow gas, fault shadow and velocity transverse variation due to calcium heterogeneous distribution etc., it proposes resolutions relevantly as follows. It uses seismic modeling to compute the reflection affection caused by shallow gas and fault; then it utilizes geo-statistical seismic inversion to quantitatively characterize calcium distribution, and reduces calcium effect by making T-D conversion based on the converted velocity model from the inverted pimp volume. All of the above techs solve the low relief structure deformation problem effectively, which are valuable to be extended to other oilfields.