Secondary Logging Interpretation Of Chang 8 Reservoir In Jiyuan Area

There are many pore types which influence the quality of the reservoir, such as the intergranular pores which is main type in Chang 8 reservoir, dissolution pore、microfissure and intracrystalline pore. The lithology consists mainly of siltstone and fine sandstones ,Chang 8 reservoir was famous for low porosity and low permeability, and 4-property (lithology, electrical property, petro- physical property and oil- bearing property) was detailed studied and system analyzed by the logging data, the production testing data, the core data, the water analysis data with the feature of low porosity and low permeability Chang 8 reservoir, moreover ,the cause of low porosity and low permeability and the proper well logging interpretation model and the standard of identify oil and water bed, improve the accuracy of interpretation, at last this lay the foundation of next study work.The lithology of Jiyuan area and Luo1 well area Chang 8 reservoir consists mainly of siltstone and fine sandstones, but others is rarely. The number range of porosity is between 5% to 11%, mainly focus on 8% ,and which of permeability is between 0.008-157mD ,mainly focus on 0.1-0.5mD,so it is evident that Jiyuan Chang 8 reservoir is belong to low porosity and extremely low permeability, in the study of 4- property, we found that lithology is the main factor influencing other property, lithology have a good relation with petro- physical, the more rough lithology, the better physical property, lithology and petro-physical together affect the oil-bearing property ,but it is not clear that this rule according to the data in study region , however the well log can response a good oil-bearing characteristics, which are following ,in the high oil-bearing property scale sand layers, the numerical show of resistivity ,neutron and acoustic is higher than the sand layer without oil and gas , but low in density natural gamma ray; the response characteristics of mudstone in well log is ,high in natural gamma ray and acoustic, spontaneous potential located in baseline bad in lithology, petro-physical property ,without oil gas show ,low in resistivity.With the analysis of the logging data, the production testing data, the core data, the water analysis data , the interpretation of the oil-water layers standard has been determined ,and some interpretation conclusion has been modified and corrected, furthermore more sand layer has founded.