喇嘛甸油田北北块开发中测井曲线变化特征及开发效果评价

Log Curve Variation Characteristics and Evaluation of Different Development Phases in Beibei Block of Lamadian Oilfield

对喇嘛甸油田北北块开发30余年来的储层特性及测井曲线变化进行了研究。通过对467口井测井资料的统计分析,总结了声波时差曲线、自然电位曲线、自然伽马和密度曲线、电阻率曲线和微电极曲线的变化规律及其原因。随着开发阶段不同,声波时差曲线呈现出先降后升再下降和先降后升2种趋势;自然电位曲线呈现出先升后降的趋势,并伴随着基线漂移;自然伽马和密度曲线呈现出下降的趋势;电阻率曲线趋势比较复杂,主要呈现出先升后降再上升、先降后升、先降后升再下降3种趋势;微电极曲线幅度表现为先降后升和先升后降再上升2种趋势。这些变化都反映了储集层在开发过程中的变化。通过注聚前后孔隙度渗透率、采出程度、水洗状况、含油饱和度、润湿性和驱油效率对比可知,注聚后各指标有变好趋势,说明聚合物驱后开发效果显著增加。

Studied are the reservoir characteristics and log curves changes in more than 30 years developments in Beibei block of Lamadian oilfield. Analyzed are the log data from 467 wells of Beibei block, and summarized are the log curves changes laws and courses of acoustic logging, SP logging, natural gamma-ray logging, density logging, resistivity logging and micro-electric log- ging. In different developing periods, acoustic time curves display 2 trends of down-to-up and down-to-up-to-down. Spontaneous potential curves present up-to-down trends along with baseline drift. Natural gamma-ray and density curves show decline trends. Resistivity curves show 3 trends of up-to-down-to-up, down-to-up and down-to-up-to-down. Micro-electric curves present 2 trends of down-to-up and up-to-down-to-up. These trends reflect corresponding changes of vari- ous reservoirs in oilfield developments. The changing trends of poroperm characteristics, degree of reserve recovery, watered status, oil saturation, wettability and displacement efficiency in the oilfield developments imply a good effect of polymer flooding.