盐北地区百口泉组沉积体系及储集特征

Sedimentary System and Reservoir Characteristics of Baikouquan Formation in Yanbei Area

通过对环玛湖凹陷盐北地区百口泉组储集层样品岩石薄片、铸体薄片鉴定及重矿物、粒度、x-衍射和岩石物性分析,在微观分析基础上,与高精度层序地层学、地震沉积学和石油地质学相结合,对该区沉积体系及储集特征进行研究,明确研究区物源方向、沉积相类型和分布演化特征,确定有利储集相带。研究表明,盐北地区百口泉组物源分北部、东北和东部3个方向,层序上整体为一个水进体系域,主要发育扇三角洲沉积体系。在百一段至百三段持续湖侵过程中,扇三角洲平原面积逐渐缩小,扇三角洲前缘和滨浅湖范围逐渐扩大。扇三角洲前缘水下分流河道砂砾岩相、河口坝砂岩相储层物性较好,是优质储层发育的物质基础,也是该区有利储集相带。

Research by Rock flakes,Cast thin,Heavy mineral,Particle size,x- ray diffraction and Petrophysical, Combinedwith the comprehensive study of high resolution sequence stratigraphy,seismic sedimentology and petroleum geology,We study the deposition system and reservoir characteristics,and then clarify the source direction, sedimentary faciestypes and sedimentary evolution characteristics. Research shows that the source direction are North,Northeast and East.Sequence is a transgressive system tract on the whole and mainly developed fan delta sedimentary system.From the firstperiod of Baikouquan formation to the third period of Baikouquan formation is an ongoing process of lake transgression.The fan delta plain area gradually reduced.The fan delta front and shore-shallow lake area gradually increase on the sametime.The fan delta front subaqueous distributary channel glutenite and the mouth bar sandstone is better reservoir withgood physical property.