松辽盆地三肇地区榆树林油田葡萄花油层储层沉积模式

Sedimentary Model of the Putaohua Reservior in the Yushulin Oilfield in the Songliao Basin

葡萄花油层是大庆外围榆树林油田刚刚投入开发的一个主要产油层。本文从取心井出发，通过储层层次划分及单井相分析，利用大量地质，测井资料详细研究了榆树林油田葡萄花油层储层沉积微相特征，确定葡萄花油层属于河控三角洲沉积，发育三种亚相：三角洲水上平原亚相，三角洲外前缘亚相，三角洲内前缘亚相，进一步划分为八种微相：水上分流河道，河间洼地，河间沼泽，水下分流河道，河口坝，支流间湾，席状砂和三角洲前缘泥。在此基础上，编制了各小层沉积微相平面展布图，结合区域地质特征。

The Yushulin oilfield is one of the oilfields with low-permeability around Daqing in the north of the Songliao basin.The Putaohua group is one of the most important reserviors that have been being developed now. In this paper,nearly 50 cored well data and more than 140 explored well data have been used. On the basis of stratigraphic correlation and facies analysis on each single well,the sedimentary subfacies features and sedimentary model of the Putaohua reservior in the Yushulin oilfield are investigated in detail. By stratigraphic correlation,the Putouhua oil reservior is divided into five sandstone eayers:P5,P4,P3,P2,P1.From northwest to southeast,each eayer overlaps another successively and both of P1 and P2 onlap the whole area. Based on the sedimentary microfacies analysis on a single well,the Putaohua reservior is identified as a river dominated delta deposit.It develops three kinds of subfacies:delta above-water plain,delta inner front and delta outer front.On the basis of this,it can be subdivided into eight kinds of microfacies: surficial distributary channel,interchannel area,interchannel swamp,subaqueous distributary channel,debouch bar, interdistributary bay,sheet sand and delta front mud. The plane distribution feature of sedimentary facies is that from northwest to southeast,delta plain,delta inner front, delta outer front appear in order.Different microfacies overlie and interlace with each other .Distributary channel sandbody and debouch bar sandbody the main sandbody framework of delta. Combining research results of microfacies analysis on a single well with plane distribution features of sedimentary microfacies, the sedimentary model of the Putaohua reservior in the Yushulin oilfield is built finally.It objectively shows sedimentary features of the Putaohua reservior and provides a certain geological evidence for further oilfield development.