Abstract：The marine carbonate rocks of the Ordovician has become one of the most important exploration and development targets in Tarim Basin, while karstification is one of the key factors to form the high-quality carbonate reservoirs. The carbonate karstic classification scheme is not unified in the Tarim Basin and the karstic terminology is not clearly defined, so the present usage on the production is of great difficulty. The karst reservoir characteristics and distribution varies in different areas,formations and periods,which are analyzed in this paper. Classification on carbonate karst of the Ordovician in Tarim Basin was worked out according to its origin and main controlling factors. The carbonate karst can be classified into 3 types,namely the weathering karst,reef body karst and buried karst. The weathering karst can be divided into 2 sub-types,i.e., the buried-hill karst and the interlayered karst. The reef body karst,interlayered karst and buried-hill karst are the most important exploration targets in Tarim Basin. Moreover,the karst forming-period in the Ordovician can be classified into 5 periods which is based mainly on the tectonic movement. Study on different types of karstic features and distribution is carried out and the exploration thought for the three important karsts is proposed. Summarily, this study unified the karstic classification and periods, which can guide the petroleum exploration and development, as well as further research work. It has crucial theoretical guidance and practical application.
Wang Zhaoming,Zhang Lijuan,Sun Chonghao. Classification,period and exploration for carbonate karstin the Ordovician,Tarim Basin[J]. JOPC, 2015, 17(5): 635-644.
