火成岩油藏油井水驱特征分析方法

火成岩油藏储层复杂多样，注水开发的水驱特征在各相带也相同，后期开发治理带来困难。为了提高火成岩油藏的水驱效率，采用油井含水特征曲线法分析了阿北安山岩油藏油井水驱特征，分为注入水沿裂缝呈条带驱、水锥锥进垂向水驱、层状水驱、油藏边水沿不整合而侵入等四种形式，经过调整取得了十分明显的效果，可供同类油藏借鉴。

METHODS OF ANALYZING WATER DRIVE CHARACTERISTICS OF IGNEOUS RESERVOIRS

Igneous reservoirs are complex and exhibit a wide variety. And accordingly, water flood responses of the individual lithofacies zones are different, which renders difficulties for harnessing in later-phase development. It is proposed in this paper that water-cut curves of oil wells can be used to analyze the waterflood character so as to increase water drive efficiency. The method has been applied to the Abei andesite oil reservoir, with four types of water encroachment recognized. Based on such analyses, adjustments were made to the waterflood performance and markedly increased water drive efficiency was obtained.