【摘要】 SG油田是辽河凹陷稠油富集区,经近30年开发,主要油层油水关系复杂,因此准确描述油层蒸汽腔的形态及其变化成为影响该区稠油生产的重要因素。岩石物理、地震、地质和油藏研究表明:持续开采后的油层孔隙内流体和岩石骨架的物理化学性质发生了变化,导致岩石密度和地震波速度下降。基于此,并结合该区实际情况,本文系统分析、研究了四维地震技术的可行性。在本期四维地震采集中,通过优化采集参数和观测系统,在激发和接收环节采取针对性的技术对策,成功地解决了地震资料分辨率和信噪比低、一致性差等问题。处理结果表明,本期四维地震资料可反映清晰的蒸汽腔形态,取得了良好的地质效果。更多还原

【Abstract】 SG Oilfield is a heavy oil rich region in Liaohe Depression and the oil&water relations for the major reservoir are complicated after 30 years of exploitation,therefore accurately characterizing the shape and the change of the steam chamber becomes an important factor which could affect the production of the heavy oil in this area. The studies on rock physics,seismology,geology and reservoir showed that the physical & chemical properties of the fluid in the pore of the reservoir and the rock skeleton were changed after many years of exploitation,which leads to the decrease of the seismic wave velocity. Based on the fact above and by considering the situations in the oilfield,the feasibility of 4D seismic technique was systematically analyzed and studied. By optimizing acquisition parameters and geometry in the 4D acquisition and by using specific techniques in ignition and receiving processes,some problems,such as low resolution,low signal to noise ratio,and poor consistency were resolved. The data processing results show that the clear steam chamber can be clearly seen in the processed 4D seismic data,and excellent geological results were achieved.更多还原