非一致性采集时移地震油藏监测可行性研究

Feasibility Study on Non-repeating Acquired Time-lapse Seismic Reservoir Monitoring

为研究非一致性采集时移地震油藏监测的可行性,利用三维高斯射线束正演模拟方法对储层段做照明度模拟分析,量化了不同观测系统参数对储层面元接收能量的影响,得到了影响储层成像照明能量大小和均匀度的最主要因素是炮检距和方位角的分布,即观测系统参数中的最大炮检距和接收线距的大小。当储层速度变化小于观测系统参数变化给面元接收能量大小带来的影响时,更有必要对时移前后数据体的观测系统进行一致性的匹配处理,这一步处理的重点应该是面元重置和面元内炮检距与方位角分布的匹配。S56区块一套非一致性采集的实际资料匹配处理试验表明:本文方法能有效地减小非储层段的地震响应差异,放大储层段的地震响应差异。

To study the feasibility of non-repeating acquired time-lapse seismic reservoir monitoring, this paper uses 3-D Gaussian ray-beam forward simulation to simulate and analyze illumination of reservoir, quantifies the impact of different geometry parameters on bin-received energy of reservoir, and finds that the main factors affecting the magnitude and uniformity of bin-received energy of reservoir are distribution of offset and azimuth, namely the magnitude of max-offset and the number of receiver-line. When velocity variation of reservoir has less effect than geometry parameters variation on the magnitude of cell-received energy, it is more necessary to conduct the conforming matching for geometry of time-lapse seismic datasets. The key point in this step should be rebinning and matching of distribution of offset and azimuth in bins. It has proved to be able to efficiently reduce the seismic respond deviation in non-reservoir and amplify it in reservoir by geometry-matching for a set of non-repeating acquired real data from block $56.