识别弱地震响应碳酸盐岩储层

针对弱地震响应的碳酸盐岩储层识别难的问题,分两步进行预测:①利用储层厚度约束的剩余信号匹配追踪法识别碳酸盐岩储层顶界.该方法是将地震数据进行多子波地震道分解,对分辨率低于测井解释最大储层厚度的分解原子进行剔除,从剩余地震道分解原子中筛选出最能体现储层特征的原子进行地震重构;②通过对在地震复赛谱域提取的混合相位子波做反褶积来适当提高主频,从而识别呈弱地震响应特征的碳酸盐岩内幕储层.反褶积结果以实时动态交互显示,并以测井解释成果作为标定依据反复迭代,最终获得满足储层识别需求的地震数据体,突出包含储层信息的弱地震响应.在TZ45井区碳酸盐岩储层预测中,该技术组合有效刻画出完整的"串珠"状反射特征,识别了内幕弱反射有效储层.

Carbonate reservoir identification with weak reflection

Carbonate reservoir identification with weak seismic reflection usually encounters some difficulties. Therefore we propose in this paper a two-step solution for this purpose: First the residual signal matching pursuit algorithm constrained by reservoir thickness identifies the top boundary of carbonate reservoir. This method decomposes seismic data into multi-wavelet seismic traces. Decomposed atoms with low resolution are eliminated, and decomposed atoms from the residual seismic trace which present reservoir characteristics are used for seismic reconstruction. Then the dominant frequency is increased by the deconvolution of mixed phase wavelet extracted from seismic cepstrum domain, so carbonate inner reservoirs can be identified with weak seismic response characteristics. Deconvolution results iteratively calibrated by logging information are displayed in real time for reservoir identification with weak seismic reflection. The proposed approach identifies successfully carbonate reservoirs with weak reflection called "bead-like reflection" in TZ45 well area.