Abstract:

Various kinds of banks developed in bioclastic limestone in Central Tarin Basin.Among them,the micro lithofacies of bioclastic and calcarenite bank bodies and their combination are mainly bioclastic limestone and bioclastic calcarenitic limestone with low porosity and low permeability.After tectonic reformation and burial dissolution,some reserviors with certain accumulative potential could form in local places such as Luonan 1 and luonan 2 Wells;the micro lithofacies of oncolite and oolitic banks and the related associations are mainly oncolite limestone,oolitic limestone and dolomite with well developed intercrystal pores and intercrystal solution pores.They are the most favourable reservoirs in the study area.These reservoirs are primarily distributed along Tazhong 22-Tazhong 14-Tazhong 4 and Tazhong 103 Wells.

Key words: Tarim Basin, bioclastic limestone, bank body, diagenesis, reservoir, distribution