下寺湾油田东沟区块长7储层特征研究

Characteristics of Chang 7 Reservoir in Donggou Block of Xiasiwan Oilfield

东沟区块地处下寺湾油田东南部,为低孔-特低孔、低渗-超低渗致密砂岩型储层,埋藏较深,开采难度较大。随着生产开发的不断深入,油藏地质研究不够精细、注采开发效果不理想、现有注水区采油速度和采出程度较低的问题愈发突出。为了进一步提高东沟区块采收率,助力下寺湾油田高效开发,在前期开发的基础上,明确了该区块延长组长7油层组的储层特征,包括碎屑组分、填隙物组分、面孔率、孔隙类型和孔隙结构特征。

Donggou block is located in the southeast of Xiashiwan Oilfield. It is a tight sandstone reservoir of low porosity,ultra-low porosity,low permeability and ultra-low permeability,which is deeply buried and difficult to be exploited. With the continuous development of production and development,the problems of insufficient reservoir geology research,unsatisfactory injection-production development effect,and low oil recovery rate and degree in existing water injection areas are becoming more and more prominent. In order to further improve the recovery efficiency of Donggou block and facilitate the efficient development of Xiasiwan oilfield,on the basis of the previous development,the reservoir characteristics of Chang 7 oil formation of Yanchang Formation in this block were defined,including clastic components,interstitial components,face rate,pore types and pore structure characteristics.