大安油田红岗北区高台子油层沉积微相特征

Study of sedimentary microfacies on Gaotaizi reservoir of Honggang northern section in the Daan oilfield

通过对大量岩心、测井资料分析、各种相标志的识别,并结合区域地质背景,认为大安油田红岗北区高台子油层属于曲流河三角洲沉积体系,发育三角洲前缘亚相和前三角洲亚相;三角洲前缘亚相发育水下分流河道、分支间湾、河口坝、远砂坝、前缘席状砂5种微相。在此基础上,通过横向对比,编制了研究区内不同砂层组沉积时期沉积微相平面展布图,研究沉积微相在垂向上和平面上的变化规律,为寻找剩余油提供了重要的地质依据。

The sedimentary mode of Gaotaizi reservoir in the Daan oilfield is established on the basis of a great deal of core data,logging data and identification of various facies,combined with regional geologic background. It is held that they be-long to meandering river delta sedimentary system,which developed delta front subfacies and prodelta subfacies. Delta front subfacies developed five microfacies as underwater distributary channel,interdistributary bay,mouth bar,distal barand frontal sheet sand. Based on this,and through horizontal correlation,in the paper the plane distribution of the sedimentary in every sublayer are drawn,and the distribution and variation of these microfacies are elaborated,which pro-vide important geologic evidence in the finding of the remaining oil.