南阳凹陷张店油田核二段储层物性特征及控制因素分析研究

Physical Property and Controlling Factors for Reservoir of the 2nd Member of the Hetaoyuan Formation in the Zhangdian Oilfield, Nanyang Depression

张店油田核桃园组核二段储层主要属于金华-张店三角洲前缘分流河道和河口坝砂体。样品物性分析研究表明:该储层属中低孔、低渗储层。其物性主要受地层水特征、岩石相类型、成因砂体和沉积相带,如颗粒粒度,分选及杂基含量等因素控制。地层水中Ca2+、HCO3-离子增加表明碳酸盐岩溶解形成次生孔隙带,核二段储层河口砂坝物性好于分流河道砂体,以块状含砾砂岩相物性最好,其次为板状和小型槽状交错层理砂岩相,砂纹层理粉砂岩相物性较差。颗粒粒度越大、分选越接近1、碳酸盐含量越少越有利储层物性。

Reservoir of the 2nd Member of the Hetaoyuan Formation in the Zhangdian Oilfield is sandy body in distributary mouth bar and distributary channel on the Jinhua-Zhangdian delta front. Physical property study indicates that it is a reservoir with medium-low porosity and the physical property is controlled by formation water, rock type, grain size, sorting, matrix content. Physical property of the reservoir in distributary mouth bar is better than that in distributary channel. Physical property of massive pebbled sandstone is better than that of sandstone with tabular cross bedding and trough cross bedding and siltstone with ripple bedding..