Characteristics and form factors of ultralow permeable reservoir in Haituozi area in the southern Songliao Basin
Li Deyong1, Zhang Jinliang1,2, Yu Xiaoyu3, Zhang Hui3, Li Jingtao4
1. College of Marine Geosciences, Ocean University of China, Qingdao 266100; 2. College of Resource Science and Technology, Beijing Normal University, Beijing 100875; 3. Jilin Oilfield Company, CNPC, Songyuan 138000; 4. Geophysical Prospecting and Surveying Team, Shandong Bureau of Coal Geological Exploration, Tai'an Shandong 271021
According to careful observation of core and analysis of cast thin section,SEM,X-ray,mercury penetration,nuclear magnetic resonance and physical property,the Fuyu reservoir is part of middle-terminal fan sand which is chiefly composed of lithic arkose and arkose.The sandstone reservoir is ultralow permeable reservoir with high bound water saturation,small pore and micro to fine porous throats.Sedimentation and diagenesis are key factors of Fuyu ultralow permeable reservoir.The Fuyu reservoir is mainly controlled by deposition and diagenesis.Terminal deposit which affects grain size,clastic constituents and interstitial material result in low original poroperm characteristics.Strong compaction destroyed great quantity of inter granular pores.Cementation,especially basal carbonate cementation completely plugged pores and throats and clay minerals generate as bridge in throats what seriously decreased reservoir permeability.Impermeable barrier,for example argillized and calcarinate zones are favor of generation of ultralow reservoir.The dissolution could not improve reservoir quality obviously.Diagenetic fracture and structural cracks play a good role in ultralow hydrocarbon reservoir of Haituozi.
Li Deyong,Zhang Jinliang,Yu Xiaoyu et al. Characteristics and form factors of ultralow permeable reservoir in Haituozi area in the southern Songliao Basin[J]. Chinese Journal of Geology, 2012, (2): 454-469.