克拉玛依油田八区克下组沉积相精细研究

Study of sedimentary facies of Lower Karamay Formation in District 8 of Karamay Oilfield

克拉玛依油田八区克下组油藏位于准噶尔盆地西北缘克乌逆掩断裂带南白碱滩断裂下盘,属于一套山前陆相盆地边缘冲积扇沉积。冲积扇体具有独立的成藏体系,针对这一典型特征,充分运用砾岩组分和重矿物资料,落实八区克下组发育的三大冲积扇体,并在充分研究各沉积微相发育特征的基础上,确定了扇体的平面展布。最后结合油田生产状况,研究了剩余油分布与沉积微相关系,为今后的剩余油开发提供可靠的地质基础。

Lower Karamay Formation in District 8,as a set of alluvial fan deposition in piedmont continental basin margin,is located in the footwall of South Baijiantan fault in Kewu overthrust belt of northwestern Junggar Basin.Alluvial fan has an independent accumulation system.Aiming at the typical characteristics,this paper makes sure of the existence of three alluvial fans by the use of conglomerate components and heavy mineral data.And on the basis of the study of the development characteristics of microfacies,the plane distribution of alluvial fans is determined.Finally,combined with the oilfield production,the relationships between remaining oil and sedimentary microfacies are studied,which provides the dependable geological recognition for remaining oil development.