油田开发阶段砂岩储集层横向对比及预测方法

Methods for sandstone reservoir lateral correlation and prediction in the development phase of the oil field

在碎屑岩储集层油田开发阶段,横向对比砂体进而预测砂体分布、形态等是重要的开发地质研究工作,其准确性对提高油田开发效率、预测剩余油分布具有重要影响。通过高分辨率层序地层学方法,以中期旋回为对比单元,建立高精度年代地层格架;开展以静态和开发动态资料为基础的综合研究,确定砂体的大小和延伸范围;根据岩心、测井资料和高分辨率地震资料进行精细的储集层沉积微相分析,确定砂体的沉积微相组合类型、展布规律与形态分布。在上述条件的约束下,以微相类型为对比标准,完成单砂层的对比和分布预测。应用该方法对比黄骅坳陷港东油田明化镇组下段部分河流相储集层,首先建立以中期地层旋回为基础的等时地层格架,再以微相类型相同为对比约束条件,然后根据确定的砂体大小预测出砂体的位置和类型。图3参7(王孝陵摘)

In the development phase of sandstone oil fields, lateral correlation of sand bodies and then their prediction of shape and distribution are very important geological research works whose veracity has much effect on improving the production efficiency of oil fields, and also on predicting the distribution of remaining oil. By using the method of high resolution sequence stratigraphy to establish high resolution chrono stratigraphic framework and to determine the reservoir size and shape, and based on core, logging and high resolution seismic data to undertake detail reservoir depositional micro facies analysis so as to determine the combination type spreading law, shape and distribution of depositional micro facies of sand bodies are presented in the paper. With the constraint of above conditions correlation and prediction principles of single sand layer are established. This method has been applied to fluvial reservoirs of lower Minghuazhen Formation of Gangdong oil field, including setting high resolution isochronal stratigraphic framework on the base of intermediate term stratal cycle and predicting the location and type of sand bodies based on their size derived.