大庆宋芳屯油田肇35区块葡萄花油层非均质性研究

从储层宏观与微观非均质性入手,分别研究了肇35区块葡萄花油层的层内、层间、平面和微观非均质性特征及主控因素,研究区层内非均质性主要受到沉积构造、渗透率韵律以及夹层分布等的影响;从物性和隔层分布特征方面分析了层间非均质性特征,自下而上葡萄花油层非均质性呈现弱→强→弱的变化趋势;平面非均质性特征受砂体及沉积微相展布影响较大,沿河道延伸方向非均质性较好。研究区主要发育正常粒间孔、缩小粒间孔和粒内溶蚀孔,整体上储层微观孔隙结构发育良好。从不同方面分析了研究区非均质性对剩余油分布的影响,沉积微相类型和成岩作用是控制储层非均质性的主因素。最终对葡萄花油层主力小层进行储层评价,预测了有利储层的发育面积和分布范围,为下一步的勘探开发提供一定的依据。

Study on Heterogeneity of Putaohua Reservoir in Block Zhao 35 of Songfangtun in Daqing Oilfield

Based on the theory of reservoir heterogeneity,this study researched the characteristics of intra-layer heterogeneity,inter-layer heterogeneity,plane heterogeneity and micro-heterogeneity,and analyzed the controlling factors.The results showed that the intra-layer heterogeneities were controlled by the sedimentary structures,the permeability rhythms and the distribution of interbed.The distribution characteristics of physical property and interlayer were analyzed and the heterogeneities changed from weak to strong then to weak from bottom to top within Putaohua reservoir.The plane heterogeneities were mainly affected by the distribution of sandstones and sedimentary micro-facies.Along the extending direction of underwater distributary channel,the heterogeneity was good.The primary intergranular pore,secondary intergranular dissolved pore and intragranular dissolved pore developed well in the study area,and the micro-pore structures were fine.The distribution of remaining oil was influenced by the heterogeneity in different aspects.The sedimentary facies types and diagenesis were considered as the main controlling factors of reservoir heterogeneity.Finally,this study predicted the developing area and distribution range of favorable reservoir for the main productive layers of Putaohua reservoir,and the result provided a certain foundation for the future exploration in the study area.