Residual oil prediction on seismic data in a deep sand reservoir,Tarim Basin: A case study of the Reservoir Donghe 1
Ling Dongming1,2, Du Qizhen1, Cui Yongping3, Tian Jun2, Yao Xianzhou2, Han Yaozu2
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Korla Branch, GRI, BGP Inc., CNPC, Korla, Xinjiang 841001, China; 3. Exploration & Production Company, PetroChina, Beijing 100007, China
Abstract:Deep burial reservoirs in Tarim Basin went through long-period shallow buried and rapid deep burial.This two-stage burial process forms three unique geological conditions:①Physical properties of deep buried sand reservoirs are well kept with medium or good porosity; ②The velocity and density of mudstone are obviously increased,generally larger than sandstone; ③Reservoirs have large internal pressure and good anti-compression ability,they are not easy to be deformed.All these constitute an important geological foundation for the residual oil prediction in deep burial sand reservoirs in Tarim Basin on seismic data.Based on available data of Donghe 1,geological models of sand reservoirs are reconstructed,and a seismic quantitative prediction is carried out.The following understandings are obtained:①Both water saturation increase and shale content decrease can weaken of seismic amplitude,and the influence of water saturation variation in the range of 0~100% is equivalent to that of the shale content variation in the range of 10%~0; ②The porosity increase can strengthen the amplitude,and the influence of porosity variation in the range of 14%~24% is ten times more than that of shale content variation in the range of 10%~0; ③Under the assumption of this article,the porosity increase and the shale content decrease form a symbiotic relationship,and their influence on the amplitude appears at the same time but in the opposite direction,the overall response is mainly caused by the porosity variation.Based on a newly acquired 3D seismic data associated with the position of injection wells and high water-cut production wells,target plots are characterized by distinct amplitude blocks.So we can distinguish response areas of reservoir physical orientation change from that of oil-water replacement caused by long-term water flooding,and then confirm the main effective direction of water injection and the approximate boundary shape of the water flooding front.Remaining oil enrichment areas are located outside.Such observations are proved by newly drilled wells in the Donghe 1 Area.
凌东明, 杜启振, 崔永平, 田军, 姚仙洲, 韩耀祖. 塔里木盆地深层东河砂岩油藏剩余油地震预测——以东河1油藏为例[J]. 石油地球物理勘探, 2018, 53(5): 1031-1040,1094.
Ling Dongming, Du Qizhen, Cui Yongping, Tian Jun, Yao Xianzhou, Han Yaozu. Residual oil prediction on seismic data in a deep sand reservoir,Tarim Basin: A case study of the Reservoir Donghe 1. Oil Geophysical Prospecting, 2018, 53(5): 1031-1040,1094.
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