稠油油藏开发水淹特征及剩余油分布研究

针对已进入中高含水开发阶段,但剩余油潜力仍较大的欢127油田,研究了全区水侵量、水侵速度及水淹方式、原因等特征，认为水淹以底水锥进为主，其次为顶水下窜、断层水侵入，不同部位，油井水淹规律和水淹程度不同，边水未造成油层水淹；在对其水驱开发特征研究的基础上,利用数值模拟、动态测试方法研究了该断块剩余油分布规律：有效厚度大、原始储量大的部位，剩余地质储量依然较大；有效厚度相对比较大的井网不完善部位，剩余可采储量相对较大；油藏边部及生产效果差的局部井区剩余油较多。为油田调整挖潜提供了地质依据。

WATERFLOODING FEATURE AND REMAINING OIL DISTRIBUTION IN THE PROCESS OF HEAVY OIL EXPLOITATION

Huan127 oilfield has been in extra high water cut period,but even there is high potential of remaining oil.For the complex water flooding feature,the water intrusion and water influx rate are tested,and the water flooding feature analyzed.It is concluded that the main reason is bottom water coning,then is underscreen water channeling and fault water flooding.Water flooding extent is different in different part of the area.Edge water does not result in water flooding.Based on study of water flooding features,according to dynamic test and numerical simulation,remaining oil distribution of this block is studied in detail.Remaining oil is mainly separated in these areas,i.e.,big effective thickness and high initial reserves area;relative high effective thickness but less explorative well area,reservoir peripheral and some less production efficiency area.The research above can provide geologic basis for oilfield adjustment and potential tapping.