Investigation Of Well Logging Reservoir Evaluation For The Ordovician Carbonate Rock In TAHE Oil Field

Tahe oil field lies to the southwestern of Akelule horseback, which locates on Shaya uplift ,the northern part of Tarim basin. During ten years of exploration and exploitation ,Tahe oil field becomes the biggest one of Paleozoic marine carbonate rocks, whose oil and gas reserves is beyond 1000 million ton and the output is 5 million ton. It has been taken multiple reserches to explore the reserves of the reservoir in Ordovician in Tahe field. However as to such a very complex geologic body ,how to progressively improve the precision in calculating reservoir parameters is still there for the geologist of petroleum exploration and productivity,therefore, there is considerable challenge for the log interpretation, so it is meaningful to study it.Firstly the lithology character and diagenesis are studied by the numbers by means of core, welllogging and porosity-permeability data on the basic of log interpretation research actuality .Secondly the reservoir is divided into five types, which are filled cave type, unfilled or partly-filled cave type, fissuring-hole type, fracture type and carst fracture-hole-pore type, and then sum up the model electrical property character for different types. On the basic of characters, The neural network reservoir identify model is set up and complete the reservoir identify first time in the research area , the results are good;then reservoir parameter is treated with different calculate methods and the results are evaluated too. Finally, combined core analysis data with log interpretation data, the rules for reservoir develop distribution and quality is worked over on the basic of fruit of reservoir origin mechanism.