松南十屋断陷储层孔隙结构及在油藏评价中的应用

根据毛细管压力曲线形态,研究区孔隙结构可分为Ⅴ类,根据孔喉分布曲线,孔喉分布可分为单峰、双峰或多峰型;不同的相带孔隙结构不同,以浅层泉头组河道、漫滩、浅水湖、砂坝等相带的中细砂岩孔隙结构为最好,为Ⅰ,Ⅱ类,深层扇三角洲、水下扇的砂岩孔隙结构较好,为Ⅰ～Ⅲ类。在油藏评价中,孔隙结构愈差,临界油柱高度和油水过渡带厚度就愈大,在相同油气柱高度下,小五家子构造所需孔隙度下限值最低,储集空间较大,利于油气聚集,艾家窝堡、西丁家皮家窝堡构造以登娄库组产油所需喉道半径最小,应以找气为主。

RESERVOIR PORE STRUCTURES AND ITS APPLICATION TO OIL POOLS ESSESSMENT IN SHIWU FAULTED DEPRESSION,SOUTH SONGLIAO

The pore structures of reservoirs in Shiwu faulted depression,south Songliao Basin could de divided into five types according to capillary pressure curves.Different facies zones may have different pore strutures.The pore stucture of fine sandstone in river channel,flood plain,shallow lake and sand bar facies zones are the best and belong to type I and type Ⅱ ;those of deep fan delta,subaqueous fan sandrocks are better and belong to I Ⅲ types.In oil pool essessment,the poorer the pore structures are,the higher the critical oil column and the thicker the oil water transitional zone would be.Under the same oil column,Xiaowujiazi structure is more favourable for oil and gas accumulation,and the Denglouku Formation in Aijiawobu,Xidingjia Pijiawobu is more favourable for searching gas.