辽河坳陷曙光油田古近系沙河街组大凌河储层研究

本文从储层的岩性、成岩作用、孔隙类型及粘土矿物对孔隙结构的影响等方面对辽河坳陷曙光油田古近系沙河街组大凌河储层的孔隙结构特征进行了分析，揭示了该储层的微观非均质性和对开发效果的影响。研究表明该油层储集层成熟度低。大凌河储层的上油组岩石为长石质岩屑杂砂岩，下油组岩石为岩屑质长石砂岩。孔隙类型以粒间孔为主，少量溶蚀孔。孔隙结构以粗孔中喉型居多，其次为中孔细喉型和细孔细喉型。粘土矿物包括蒙脱石、伊利石、高岭石，其中蒙脱石含量最高，尤其是下油组。在油田开发时，为防止过度伤害孔隙结构、破坏储层，针对上下油组存在的非均质性，应制定不同的开采方案，控制注采液在油层中的流速，注入蒸汽的PH值不要高于9，同时在蒸汽水中加入适量的钾离子。

DALINGHE RESERVOIR OF THE SHAHEJIE FORMATION OF PALEOGENE IN SHUGUANG OIL FIELD, LIAOHE DEPRESSION

The pore texture characteristics of the Dalinghe reservoir of Shahejie Formation of Paleogene in Shuguang Oil Field of Liaohe Depression were analyzed from the lithology, diagenesis, pore types and clay minerals of the reservoir, and reservoir micro-heterogeneity and its affection on development effect were studied. The textural and compositional maturation of the Dalinghe reservoir is low. The upper part of the Dalinghe reservoir consists of feldspathic litharenite and the lower part consists of lithic arkose. Intergranular pores are the major pore type, and there are also some secondary solution pores in reservoir. Pore texture is mainly large pore with medium throat and next is medium pore with thin throat and thin pore with thin throat. Clay minerals include montmorillonite, kaolinite and illite, and the montmorillonite is the most abundant especially in upper oil formations.To prevent damaging pore structure and oil reservoir heavily during development, different exploiting schemes should be adopted and the flowing velocity of injected fluid in the oil formation should be controlled considering the heterogeneity of the upper and lower formations. While injecting steam whose pH should be not more than 9, certain amount of K+ should be added.