The Reservoir Logging Evaluation Of Donghesandstone In CK3 Wells Block In The Oilfield Of TZ4

The oilfield of TZ4 has been explored and developed for many years,which confirmed this area is characterized of having a multi-layers oil system.But the reservoir of this area is complex,the diagenesisis strong,the reservoir is compact and it's difficult to calculation the reservoir parameters,so to interpretation the reservoir parameters finely and divide the effective thickness would provide strong technical support for reserve upgrading,and is of great significance for the block to adjust the development plan.The small layer be divided in this paper,studied the sedimentary facies,interpeted the logging reservoir parameters,analyzed the four features of reservoir,researched on the reservoir characteristics and finally evaluated the reservoir types by using the core data,geological data,testing data,log data and so on.Based on the above research results,it has summed up the development characteristics of reservoir of the Donghe sandstone section containing conglomerate in The oilfield of TZ4.According to depositional cycles and reservoir characteristics and taking the method of combining and correlating log to divide and correlate small layers under the guide of theory and methods of high-resolution sequence stratigraphy.It divided the section containing conglomerate formation into 5 small layers from top to bottom.Through studying the sign of sedimentary facies,the color of rock core,rock ore composition,grain size characteristics,sedimentary structure and so on,The results showthatthe section containing conglomerate in the study area is shorelanddeposit.Shoreland deposit is subdivided into two subfacies of shoreface which developed in 1,2,3 layer of the section containing conglomerateand foreshore which developed in4,5 layer.The model fit the study area is optimized after reservoir parameters contrasted which has used several methods to correlate it.The results show that shale content get from Petcom model is better;acoustic wave has been optimizedfor the porosity models,some wells without acoustic wave select the density curve model;permeability model depends on the correlation of porosity and permeability;oil saturation is calculated by Archie's equation.Based on studying the core physical properties data of the reservoir in the section containing conglomerate,this study indicates that the reservoir is the medium porosity and medium permeability categories.overall,the sandstone type is mainly of lithic quartz sandstone and feldspar quartz sandstone and the physical properties of 1,2,3 layer is worse than 4,5 layer.Based on the division and contraction of substratum and reservoir parameters precisely interpreted,the interlayer of section containing conglomerate in study area will be put into three categories: interlayer of calcareous sandstone,interlayer of laminated shaly sand calcium and interlayer of laminated shaly sand.From summing up the well logging response's characteristics of three categories interlayer,and establishing the well logging criterion of identification,and taking identification to the interlayer in single well,we can draw the contour map of interlayer thickness by extracting interlayer data in all single well.Through the study of lower limit of effective thickness,the lower limit of lithologic oil content has been defined as silt with oil flecked and the lower limit of the physical is properties of 8%,structure and oil saturation of a minimum of 50%.On this basis,we select the effective thickness,porosity,permeability,oil saturation,pore throat type as a reservoir evaluation parameters,the reservoir of the study area is divided into 3 types after reservoir classification research.Analysis shows that in the study area,the reservoirs in the 4,5 layer are better than those in the 1,2,3 layer.