利用小波相干技术检测致密储层裂缝发育带

MONITORING FRACTURES DEVELOPMENT BELT OF TIGHT RESERVOIR BY TECHNIQUE OF COHERENT WAVELET

目前国内、外油气勘探已经进入岩性油气藏勘探阶段,其中致密碳酸盐岩或页岩油气勘探具有远大前景。这类致密储层中裂缝是油气储集的主要空间。用模拟地震子波的小波函数对原始三维地震数据体作小波变换,可以得到不同频带(分辨率)的地震数据体。分别对具有不同分辨率的三维地震数据体进行C3相干处理,其中低频相干体突出了断裂的信息,而高频相干体则突出反映了受断裂控制下的小断裂或裂缝的发育信息,通过合理的融合系数有选择地对C3相干数据进行融合,获得了能够高精度分辨裂缝发育特征的相干数据体,由此提高了裂缝检测和储层预测的精度。

At present, exploration activity have gone into explored phase of lithologic hydrocarbon reservoir at home and abroad, and oil and gas exploration of tight carbonate or shale have showed broad potentials. The fracture is critical hydrocarbon pore volume in this tight reservoir. Firstly, we obtained seismic data volume of different frequency bands by using simulative function of seismic wavelet to make wavelet transformation with 3D seismic data volume. Secondly, we did C3 coherent transformation for 3D seismic data volume of different frequency bands. Low-frequency coherence data predominate the information of fault.By contrast, radio frequency coherence data predominate the message of minor fault or fracture which is controlled by the faults. Finally, C3 coherence data is selectively mixed together through appropriate interfusion coefficient. We acquired coherence data volume what can distinguish the development character of fracture by high precision, which increase the accuracy of fracture detection and reservoir prediction.