濮城油田西区沙二上1油藏沉积微相研究

Sedimentary microfacies of Upper Es₂¹ reservoir in West Region of Pucheng Oilfield

李海燕 徐樟有 郭辉 康平

1.中国石油大学资源与信息学院，北京 102249; 2.华北油田分公司二连石油勘探开发公司， 内蒙古 锡林浩特 026017

Faculty of Resource and Information, China University of Petroleum, Beijing 102249, China

重新认识处于开发中后期油藏的沉积环境、沉积微相及其特征,建立准确的储集层模型，对于查明剩余油分布和挖掘剩余油潜力、提高采收率具有重要的现实意义。综合利用岩心、测井、录井及相关测试资料，对濮城油田西区沙二上1油藏沉积微相进行了系统研究。结果表明：该油藏为一套辫状河三角洲沉积，主要发育辫状分流河道、心滩、泛滥平原3个微相，辫状分流河道和心滩砂体为储集层骨架砂体。分析了研究区各小层沉积微相的时空展布特征，讨论了沉积微相与含油性的关系，以及不同沉积微相剩余油的挖潜对策，为油田开发方案的调整和动态分析提供了可靠的地质依据。

For a reservoir at the middle-post development stage, a fine study on microfacies is very important for modeling a proper reservoir, getting a proper knowledge of remaining oil distribution and improving oil recovery rate. Using core, log, mud log and related test data, and through various facies marks and regional geological background analysis, the sedimentary microfacies in Upper Es₂¹ reservoir in West Region of Pucheng Oilfield is studied. This region belongs to braided river delta deposit and it is further divided into 3 microfacies. They are braided distributary channel, diara and flood plain. The braided distributary channel and diara deposits are the main reservoir sand bodies. The evolution and distribution of the microfacies in every layer have been studied. The relationship between microfacies and oiliness and different potential tapping measures for different microfacies are discussed. The results can provide a geological foundation for the adjustment of reservoir development scheme and dynamic analysis.