Quantitative study on diagenesis in reservoirs with extra-low to ultra-low permeability in the Member 4 of Lower Cretaceous Quantou Formation in Da��an Oilfield, Songliao Basin
Shi Chaoqun, Wang Yunlong, Qin Zhi ,Lin Yanbo ,Pan Zhaoguang ,Chen Guohui ,Liu Xiaoqin ,Bao Zhidong, Tao Zui, Fang Song, Dou Luxing, Yao Tingting ,Yang Shangfeng, Yang Yichun
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249 2 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249 3 Exploration and Development Research Institute of Tarim Oilfield Company,CNPC,Korla 841000,Xinjiang 4 Fuyu Oil Production Plant,Jilin Oilfield Company,PetroChina,Songyuan 138000,Jilin
5 The Fifth Oil Production Plant,Changqing Oilfield Company,PetroChina,Xi??an 710018,Shaanxi 6 Geology Research Institute of Great Wall Drilling Corporation, CNPC, Panjin 124010, Liaoning
Abstract：The diagenetic types,intensity,and the influence factors of extra-low to ultra-low permeability reservoirs of the Member 4 of Cretaceous Quantou Formation in Da??an Oilfield are analyzed by using data of thin section,casting thin section,SEM,physical properties,logging explanation and particle size analysis. The results show that:(1)Compaction is the dominant diagenesis which leads to the loss of the pore. The compaction degree is medium,which has a good correlation with the compound sand thickness,sorting coefficient,mud content etc.(2)The carbonate cementation is the second important factor for the poorer physical properties of reservoirs. The cementation degree is quite weak,and the decrease of the porosity caused by cementation is related to the distance from the reservoir to the configuration surface,quartz content,clastic component content and matrix content.(3)The dissolution degree is relatively weak,which can improve the physical properties of the reservoirs. The increased porosity ratio by dissolution has a certain correlation with compound sand thickness and matrix content. The influfence degree of compaction,cementation and dissolution on the physical properties of reservoirs can reflect that the vertical superimposition relationship of sand bodies,thickness of channels,and hydrodynamic intensity can affect the types and intensity of diagenesis.
Shi Chaoqun, Wang Yunlong, Qin Zhi et al. Quantitative study on diagenesis in reservoirs with extra-low to ultra-low permeability in the Member 4 of Lower Cretaceous Quantou Formation in Da��an Oilfield, Songliao Basin[J]. JOPC, 2016, 18(2): 251-264.
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