Multiscale description and controlling factors analyses of fluvial tight reservoir: a case study on the 8th Member of Lower Shihezi Formation in Sulige gas field, Ordos Basin
BI Mingwei1, SUN Jiaopeng2, CHEN Shiyue3, ZHOU Zhaohua4, ZHANG Manlang4, QIAN Aihua4
1 School of City and Architecture Engineering,Zaozhuang University,Shandong Zaozhuang 277160,China; 2 Department of Geology,Northwest University,Xi'an 710069,China; 3 School of Geosciences,China University of Petroleum,Shandong Qingdao 266580,China; 4 PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083,China
Abstract：In this study,we carries out a comprehensive work of outcrop section observation,microscopic petrology investigation and quantitatively analysis of microscopic pore structure to reveal the fluvial reservoir characteristics of the 8th Member of the Lower Shihezi Formation of Su6 Area,Sulige Gas Field. Sand body structure characteristics,sandstone types,pore types,microscopic pore structure characteristics are detailed analyzed to indicate the controlling factors of effective fluvial tight sand reservoir. Our work demonstrates that the sand body of channel bar and point bar are the flooding event deposition and are medium-coarse grained lithic quartzarenite and litharenite. On the contrary,the channel fill microfacies sand body is the normal river flow period deposition,the associated sandstone is characterized by fine grained(feldspathic)litharenite and lower structure maturity. The medium-coarse grained sandstones have a large proportion of dissolved and interconnected pores with larger radius effective pore-throat. The pore types of fine-grained sandstones are mainly clay minerals intercrystalline pores,and the pore-throat radius is much smaller. Densification modes of fluvial reservoir can be divided into three types,such as densification of medium-coarse grained lithic quartzarenite by strong siliceous cementation and medium to strong compaction,densification of medium-coarse grained litharenite by strong compaction,densification of fine grained(feldspathic)litharenite by strong compaction and medium to strong siliceous cementation. The two types of medium-coarse grained sandstones are densification after hydrocarbon charge,which experience injection of organic acid and make dissolved pore to be the major storage space. Fine grained(feldspathic)litharenite is densification before hydrocarbon charge,which experiences weak dissolution. Differences of densification modes result in variable pore structure characteristics and reservoir physical properties.
BI Mingwei,SUN Jiaopeng,CHEN Shiyue et al. Multiscale description and controlling factors analyses of fluvial tight reservoir: a case study on the 8th Member of Lower Shihezi Formation in Sulige gas field, Ordos Basin[J]. JOPC, 2023, 25(3): 684-700.
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