| The sedimentary facies type of the Middle Array of Ordovician Majiagou Reservoirs is variable,the corresponding logging features are obvious,and it's possible to analyze and predict the sedimentary facies by using logging data.Based on the analysis and observation of well cores and thin sections of more than 30 wells from the Ordovician Majiagou formation Ma5 in Ordos basin,and combined with well logging,mud logging and testing data,this paper studies and analyzes systematically on the sedimentary characteristics and image characteristics of carbonate platform.In the research area,there are open platform and restricted platform facies.Grain bank and interbank sea subfacies exit in open platform,and tidal flat is developed in restricted platform.By the contrast of image and conventional logging characteristics of the above-mentioned sedimentary facies,this paper summarizes the relationship between carbonate platform facies and image logging,and build up the carbonate platform `s image pattern library and relative determination method.By using this method,this paper analyzes other wells nearby,and build up connecting-well profiles.With the help of artificially determined sedimentary facies and data of gas testing production,we can validate this method and develop the image pattern library.In general,through preparation of project research and paper,deepened on Jingbian Gas Field on the west side of the Ordovician carbonate reservoir rock layer deposition facies imaging characteristics and favorable reservoir understanding assemblages,of Ordos Basin in the lower Paleozoic carbonate reservoir exploration has important guiding significance. |
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