大庆油田肇35区块葡萄花油层储层特征及控制因素

通过对研究区岩性数据、薄片、扫描电镜以及压汞实验资料的统计分析，对储层的物性特征和孔隙结构进行了研究。该区块葡萄花油层为中孔、中-高渗储层，孔隙类型主要包括正常粒间孔隙、缩小粒间孔隙和粒内溶蚀孔隙。该区储层具有较低的排驱压力和毛细管压力中值，微观孔隙结构发育良好，属于中-粗孔喉。根据孔隙度、渗透率、排驱压力、孔隙喉道半径平均值与进汞饱和度5个参数，将该区储层分为4类，即大孔粗喉道孔隙类型、中孔中喉道孔隙类型、中小孔小喉道孔隙类型和小孔微喉道孔隙类型，评价结果分别为好、较好、一般和差储层。储层物性主要受到沉积条件、压实作用以及胶结作用影响，其中以沉积作用为主，水下分流河道砂体的物性条件最佳。

Characteristics and controlling factors of pore features in the Putaohua oil reservoir in the Block Zhao-35,Daqing oilfield

A statistic analysis of lithology，thin section，SEM observation and mercury injection data reveals the physical properties and pore structures of the reservoirs in the study area.It suggests that the Putaohua reservoir is characterized bymedium porosity and m iddle-to-high permeability.Its pore types include normal intergranular pores，reduced intergranular pores and intragranular dissolved pores.The reservoir also features in low displace-ment pressure，low median capillary pressure，well-developed m icroscopic pore structure，and medium-to-large pore throat.Five parameters，namely the porosity，permeability，displacement pressure，mean pore throat radius and mercuryˉinjection saturation，are used to classify the reservoirs in the area into four types.TypeⅠhas large pore and wide throat;typeⅡhasmedium pore and medium throat;typeⅢhasmedium to small pore and small throat;and typeⅣhas small pore andm icro throat.They are supreme，good，fair and poor reservoirs respectively.The reservoir qualities are controlled by sedimentation，compaction and cementation，amongwhich sedimentation is predom inant.Reservoir quality of underwater distributary channel sand is the best.