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《Petroleum Geology & Oilfield Development in Daqing》 2008-01
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Analysis on development controlling factor of carbonate rock ancient karst in T_7~4 interface of central Tarim area

WANG Li-dong1,WAN Li1,YU Bing-song2(1.Water Resource and Environmental Academy,China University of Geosciences,Beijing 100083,China;2.Geoscience and Resource Academy,China University of Geosciences,Beijing 100083,China)  
T47 interface is a significant unconformity surface in Ordovician of central Tarim area,and high production airflow has existed in carbonate rock crust of weathering in the lower part of central Tarim area.Petroleum exploration practice in central Tarim area and analysis of geography and geology condition during the period of T47 interface formed provide enough evidence for wide development of carbonate rock karst with same period in the central Tarim area.On the basis of modern karst formed principle,study of ancient karst in carbonate rock under T47 interface indicates that,ancient karst in this area is a kind of erosion surface karst mainly developed in fracture of 250-300m and cavity under T47 interface,which vertically has better zonality,respectively from top to bottom,being epigenetic rock belt,vertical filtering flow belt,seasonal variation belt,level potential flow belt and deep sluggish flow belt.Furthermore,ancient karst is controlled by several factors including palaeoclimate,lithology,structure,palaeotopography and hydrologic geology,of which the last three are key factors.The next petroleum exploration key areas are located in slow slope gradient of karst sloping fields in the south and north sections of ancient karst highland.
【Fund】: 国家“973”项目(2005CB422103);; 中国石油集团公司重点项目联合资助
【CateGory Index】: P618.13
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