微地震监测水驱前缘技术在哈得双台阶水平井的应用效果评价

哈得4油田薄砂层油藏首创采用双台阶水平井注水开发，然而双台阶水平井的动态监测是一个全新的课题，注入水朝哪个方向推进、主力驱替方位如何、水驱前缘波及何处都难以判断。示踪剂方法施工复杂、周期长、精度不够，只能粗略判断，而利用微地震监测水驱前缘技术，却可准确得到注水井的水驱前缘状况、注入水的波及范围、优势注水方向，为中后期合理调整、挖掘剩余油、提高最终采收率，提供了可靠的技术保障。

Application Evaluation of Microearthquake Monitoring Waterflood Front Technique Used to Double Step Horizontal Wells in Hade Oilfield

Dual step horizontal well waterflood is initiated in Hade4 oilfield, and it is used to the thin sand oil reservoirs. However, the dynamic monitoring of dual step horizontal wells is a kind of new task, and it is difficult to diagnose the advancing direction of injected water, the main displacement direction, and the area swept by waterflood front. For tracer method, its construction work is complicated, the cycle time is long, the accuracy is not high, and the diagnosis is done roughly. However, with the application of microearthquake monitoring waterflood front technique, the waterflood front in injectors, the range swept by injection water and the predominant water injection direction can be known clearly. This technique can provide with reliable technical security for the reasonable adjustment at middle to late period, further development of remaining oil, and the increase of ultimate recovery factor.