The Study On The Logging Evaluation Method Of Chengdao Oil Field Buried-hill Reservoirs

Chengdao oil field is located in conjoint area of Jiyang depression and Bo-zhong depression. The oil resource is enough, fractures and vugs are developed in this region, and it has good reservoir-creating conditions. Because of multi-period structure movement, many defaults were created, the formation structure is more complicated and reservoir parameters varied frequently.Based on geology and logging theory, we have studied logging evaluation method of reservoirs in this region. After combination of core analysis and logging data, logging responses of all kinds of reservoir and its space are summarized. The fractures are evaluated by use of all logging information, and methods of fracture validity identification are founded. Taking CB30 buried-hill for example, we have studied how to determine local horizon stress direction from such as acoustics and resistivity imaging logs, dip logs, dipole acoustics logs and so on. After Some logging data are calibrated and optimized with some geological information and data from petrophysis laboratory, some reliable log interpretation models are set up effectively. Finally, the research productions are used in CB306 geological evaluation, and application proved all methods effective and feasible.