水驱四维地震技术可行性研究及其盲区

4-D seismic in water flooding reservoirs:Feasibility study and its limitation

由于水替代油造成的速度差异小 ,再加上我国陆相储层厚度薄 ,油质重 ,东部油田大都处于高含水开发后期 ,所以很多人都对水驱四维地震监测持怀疑态度。通过深入剖析长期水驱过程引起的各种油藏参数变化规律以及这些参数变化对地震响应的影响 ,以渤海湾地区岩石物理数据为依据 ,结合高 2 9断块具体的油藏参数进行长期水驱四维地震可行性研究 ,指出过去水驱四维地震可行性研究中存在的盲区———没有考虑长期水驱过程造成物性变化及其对地震响应变化的影响。如果考虑这些因素的影响 。

It is doubted whether 4 D seismic in water flooding reservoirs will succeed in east China because of the subtle velocity variations caused by substitution of oil with water. To further complicate this situation, the continental reservoirs in China are mostly thin with heavy oil, and most of oilfields are in high water cut period. The author analyzed how water flooding affects the reservoir parameters and how seismic responses with the reservoir changes. Feasibility study was carried out in Block Gao29 which is experienced long time water flooding based on petrophysical parameters of Bohai Bay. It is concluded that long term water drive production would affect the reservoir parameters and cause significant seismic variations that can be detected easily by 4 D seismic methods. The results could clarify the confusions in 4 D seismic feasibility study in China