Discovery and characteristics of coated gravels and coated conglomerates from the Ordovician karst cave and sediment in northern margin of Tarim Basin
Zhong Jianhua1, Ni Liangtian1, Cao Mengchun1, Chen Xin2, Zhang Danfeng3, Sun Ningliang1, Hao Bing1, Liu Chuang1, Shao Zhufu4, Niu Yongbin5
1 School of Geosciences,China University of Petroleum(East China),Qingdao 266580,Shandong; 2 BGP Geophysical Research Institute,CNPC,Zhuozhou 072751,Hebei; 3 Research Institute of Petroleum Exploration &Development,PetroChina, Beijing 100083; 4 Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, Shandong; 5 Institute of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000,Henan;
Abstract：Coated gravels and coated conglomerates, a specific type of sediment from karst caves and palaeokarsts,were found in the Ordovician in northern margin of Tarim Basin. These coated gravels and coated conglomerates,not been documented previously,are characterized by oolith- or oncolite-like textures,i.e.,a core and coat around the core. The core is divided into four types:(1)limestone gravel identical to the country rock of the karst cave;(2)core composed of sandstone;(3)composite core of conglomerates and(4)core comprised by palaeotravertine clasts. The coat is also divided into four types:(1)coat with cycles;(2)granular coat;(3)homogeneous coat and(4)composite coat comprised by granular coats and cycle-like coats. Coated gravels and coated conglomerates are typical products of karst caves and palaeokarsts, which can be served as markers of the presence of karsts and karst caves. Furthermore,the inherent storage capability in coated gravels and coated conglomerates make them effective hydrocarbon reservoirs,and thus a target for oil and gas exploration and development.
Zhong Jianhua,Ni Liangtian,Cao Mengchun et al. Discovery and characteristics of coated gravels and coated conglomerates from the Ordovician karst cave and sediment in northern margin of Tarim Basin[J]. JOPC, 2016, 18(5): 721-730.
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