致密砂岩储层中优质储层的划分及识别方法研究

Research on the Division and the Identification of High-Quality Reservoir in Tight Sandstone Reservoir

辽河油田清水洼陷沙三段致密砂岩储层由于具有致密、物性条件差、非均质性强的特点,因此准确的划分及识别优质储层已经成为提高油气储量和采收率的重点和难点。本文基于试油投产数据、岩心分析数据、测井响应数据和压汞数据,通过研究取心井的"四性"关系,利用测试法、压汞参数法、经验统计法、测井曲线法,给出了优质储层的测试、物性和电性划分标准,并且根据所划分的标准,优选出识别优质储层的敏感测井响应,分析了优质储层的毛管压力曲线形态特征,建立了两种识别优质储层的模型。利用建立的两种模型对该区块齐232井进行优质储层识别,将识别结果与试油结果进行对比,结果表明,本文给出的模型可很好的用于该区块优质储层识别。

The tight sandstone reservoirs in S3 Formation in Qingshui sub-sag of Liaohe oil field are characterized by tightness, poor physical properties and strong heterogeneity. Therefore accurate division and identification of the high-quality reservoirs become the key and difficult points in improving reserves and recovery ratio of hydrocarbon. Based on the oil-testing data, core data, logging data and mercury-injection data, a division standard of high-quality reservoirs is established by studying the four-property relation of coring wells and using testing model, mercury-injection model, statistical method and logging model. Based on the division standard, the sensitive log response for high-quality reservoirs identification is chosen. After analyzing the morphological characteristics of capillary pressure curve of the high-quality reservoirs, two models are established which are used in Well 232. The comparison result shows that the two models can be applied well in identification of high-quality reservoirs.