储集层沉积微相对剩余油分布的控制——以双河油田为例

Control on the Remaining Oil Distribution by Reservoir Sedimentary Micro- facies-an example from Shuanghe Oilfield.

针对双河油田“九五”期间迫切需要解决的问题,研究了储集层沉积微相的规模、平面分布和物性特征及其对剩余油分布的控制。认为,双河油田扇三角洲前缘主要发育水下分流河道、河口坝、前缘席状砂体、重力流砂体、水下溢岸砂体等微相砂体,它们具有不同的几何规模、物性和平面分布特征。这些特征控制了油层的吸水和产液能力、平面油水运动,进而控制了剩余油分布特征。指出在油田开发后期,剩余油主要富集在规模小、物性相对较差的微相砂体中,从而形成了小型透镜型和镶边搭桥型两种剩余油富集形式。

In order to meet the imperative need of'the Ninth Five-Year Plan'project in Shuanghe oilfield,this pa-per studies the geometrical scale,plane distribution,petrophysical characteristic of the sedimentary microfacies and their controls on the distribution of remaining oil.There are mainly distributary channel,river mouth bar,front sheet sand,gravity flow sand and overbank sand in the fan delta front of Shuanghe oilfield.Each of them holds its own features of geometrical scale,plane distribution and petrophysics.These features control injection and liquid producing capaci-ties of the pay zones,plane oil-water movement and well-pattern controlled degree;furthermore,they also control the re-maining oil distribution.The remaining oil divided into the lace-like and the lens-like occurs richly in the microfacies sand bodies with poor petrophysical property and small scales during the late period of development.