Investigation Of Well Logging Reservoir Evaluation For The Ordovician Majiagou Formation In Fuxian Region

Fuxian region is located in Erdos basin tectonic units in North Shaanxi Slope southeast of fracture-cave system is complex, the Ordovician carbonate rocks, different pore structures, constitute the different reservoir type, how to correctly identify the types of reservoir and to determine the accurate position, has been an important research topic in the area of oil and gas exploration the development.so it is meaningful to study it.In connection with Fuxian region’s geological characteristics, this thesis, based on summarizing the data area’s available information, mainly analyzes the gas reservoir’s lithology and reservoir characteristics from the logging area, by collecting and analyzing the typical drilling core data and logging data, the thesis carried out researching on the logging reservoir parameters. By processing and analyzing the core data of physical properties(core homing),the thesis established the shale content, porosity, permeability and water saturation log data with the frequency histogram trend method, the thesis established a unified standard. On the basis, identifying lithology and combining with reservoir parameters, this thesis integrated to determine the lower limit of the reservoir. And then to use resistivity porosity cross plotting and acoustis method to identify fluid.