1 中国石化石油勘探开发研究院无锡石油地质研究所，江苏无锡 214151 2 中国科学院地质与地球物理研究所，北京 100029 3 University of Regina，Regina,SKS4S OA2，Canada 4 中国石化石油勘探开发研究院，北京 100083
Types of dolostones and pore evolution of the Middle and Upper Cambrian in Kuruk Tag area of northeastern Tarim Basin
Qian Yixiong1, Chen Daizhao2, You Donghua1, Qing Hairuo3, He Zhiliang4, Dong Shaofeng2, Ma Yuchun1, Jiao Cunli4, Tian Mi1
1 Wuxi Institute，Exploration & Production Research Institute，SINOPEC，Wuxi 214151，Jiangsu 2 Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029 3 University of Regina，Regina.SKS4S OA2，Canada 4 Exploration & Development Research Institute，SINOPEC，Beijing 100083
Abstract：In a geological analogous study，the Middle and Upper Cambrian rocks from the northern Xingde fault of the Kuruk Tag area，northeastern Tarim Basin，were systematically investigated.These rocks consist of shallow marine platform carbonate rocks，with extensive dolomitization，and show significant differences from the Cambrian hydrothermal dolostones(HTD) in the Western Canada Basin.The Canadian dolostones are genetically related to fractures and breccia zones partially to completely including the fractures and presumably formed due to hydrothermal fluids expelled from the Rocky Mountain fold-and-thrust belt during the Laramide orogen.In contrast，the hydrothermal dolostones(HTD) in the studied Tarim Basin were formed as the result of hydrothermal fluid infiltration and alteration associated with deep-burial diagenesis，possibly controlled by recirculation of formation water in the strike-slip fault zones during the Late Permian(Late Hercynian)in northeastern Tarim Basin.According to the texture，six types of dolostones can be differentiated，including：（1）silt-sized dolostone，（2）fine-medium crystalline dolostone，（3）medium-coarse crystalline dolostone，（4）fine-crystalline dolostone with bright rims and dark cores，（5）saddle dolostone and（6）fracture and vug-lining dolostones，coarse or saddle dolostones.These dolostones form a complete sequence of diagenesis，starting with dolomicrite，and fine-medium crystalline dolostone as the early replacement of calcilutite at shallow-burial，followed by coarse and heterogeneous medium-coarse crystalline dolostone as the result of recrystallization at elevated temperatures in deep-burial，and then saddle dolostone and fracture and vug-lining coarse or saddle dolomite precipitated directly from re-circulated hot formation water.The HTD identified in the Tarim Basin samples display distinct coarse non-planar sucrosic textures，with few intracrystalline pores，intercrystalline dissolution pores.At least four period of fissures，dissolution，cementation，or filling，have been recognized，with the earlier fractures being filled with the late dolostone，partly precipitated dolostone，quartz，bitumen-bearing barite and anhydrite.While the pore development during deep burial has been controlled by original-bedding，fault-fissure，diagenesis，infiltration and hydrothermal alteration process，the later exposure to meteoric water may have been important for the late diagenetic pore system related to dolomitization.
Qian Yixiong,Chen Daizhao,You Donghua et al. Types of dolostones and pore evolution of the Middle and Upper Cambrian in Kuruk Tag area of northeastern Tarim Basin[J]. JOPC, 2012, 14(4): 461-476.
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