The Study Of Logging Evaluation Method Of Chang8Reservoir In Zhiluo Oildom, Yanchang Oilfield

Chang8reservoir in Zhiluo oildom, Yanchang oilfield has the characteirstics of complexlithology, thin layer and interbed development, and low porosity and permeability. The logginginterpretation of this area is restricted by them. In order to improving the coincidcncc rate oflogging interpretation of Chang8reservoirs, and achieving the purpose of guiding theexploration and development effectively, the paper has finished the research work thatincludes the stratigraphic division and comparison, erservoir rock physics ersearch, reservoirpore texture study，reservoir four properties relations study, reservoir parameters interpretationmodels researchg, estabilishing the logging evaluation criteiron, fluids rate forecast and so on.The research indicates that the reservoir Chang8is divided into Chang8i and Chang82.By means of litho-electirc experiment, the relationships of formation factors and porosity, theincreasing rate of resisitivity and water saturation of Chang8reservoir are built. The reservoirpore structure is studied by mercury injection expeirment and NMR core analysis method.Chang8reservoir is divided into I, II and11L and reservoir classification standard of thestudy area is established. Four characters of reservoir and logging interpretation parameters arestudied and logging interpretation models are built in different paritions. Logging evaluationstandards of3reservoir of Chang8in the study area are built by the method of reservoirclassification modeling, the re-examination of old wells and the interpretation of new wells iscompleted by using these standards. Based on the Archie equation, combined with logging andtesting data, the production prediction model is built，and the production is predicted.The main achievements and innovation points of this study are as follows: the logginginterpretation standard of Zhiluo oildom, deep induction ersistivity-compensated sonic chart,oil composite index-porosity chart and porosity-oil saturation chart are established. Theeffective reservoir lower limit of Zhangjiawan oildom，Zhangcunyi oildom, Zhiluo oildom andNiuwu oildom is conifrmed. Building the relationship of testing yield and acoustic time,resistivity, oil saturation, the normalized thickness, production prediction is conducted.