滨南油田毕家地区沙三下亚段沉积特征及沉积模式

Reservoir sedimentation characteristics and sedimentation model of lower Es_3 of Bijia block in Binnan Oilfield

根据区域地质、地震、测井及岩心分析资料,对胜利油区滨南油田毕家地区沙三下亚段沉积特征及沉积模式进行研究。结果表明:毕家地区沙三下亚段具有湖泊不断扩张演化特征,为陆相断陷湖盆陡坡扇三角洲沉积,可进一步细分为扇三角洲平原、扇三角洲前缘、前扇三角洲3种亚相,以及辫状水道、辫状水道间、水下分流河道、水下分流河道间、河口坝、席状砂以及前扇三角洲泥、浊积扇8种微相类型;古地形和边界同生断层是毕家地区扇三角洲形成的重要条件。

According to regional geology, seismic, logging and core analysis data, the reservoir sedimentation characteristics and sedimentation model of the lower part of member 3 of Shahejie formation（ Es3 ） of Bijia block in Binnan Oilfield were researched comprehensively. The results show that the area has the sedimentation evolution characteristics of the sedimentation lake enlarged continuously, and the sedimentary facies of interval is fan-delta region in continental fault-trough lake basin. The fan delta could be further separated into three sobfacies including fan-delta plain, fan-delta front, former fan delta, and eight mierofacies such as braided channel, braided interchannel, submerged distributary channel, submerged distributary interchannel, mouth bar, sand sheet, ante-fan delta mud and turbidite. The old topography and border contemporaneous fault are important elements for fan delta developed in Bijia area.