Fine log interpretation for oilfields with thin sands and multiple developed layer systems
GUO Zhi1, YANG Shaochun2, JIA Ailin1, SUN Yingying1
1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
2. School of Geosciences, China University of Petroleum, Qingdao 266580, China
The Yuejin-2 oilfield located in the Qaidam Basin is a typical thin-sand and multiple-developed-layer oilfield characterized by many vertical oil-bearing formations, thick intended intervals, thin single sand body, laterally small scale of sand body, narrow sedimentary facies with dramatic changes, and significantly different reservoir features of sedimentary environments. Taking the N21 reservoir of the Yuejin-2 oilfield as a study object, fine log interpretation models was establised for thin-sand and multiple-developed-layer-system reservoirs according to microfacies zones of different bed systems, and a fine log interpretation was conducted with these models, which improved the interpretation accuracy ratio greatly. A certain progress in the integration, quantification and computer automation of fine log interpretation was made and some methods for fine log interpretation on thin sands and multiple-developed-layer systems were employed as well, which including as following:pre-processing and standardization of log data; automatic division of layers according to the shale content calculated with logging curves; automatic recognition and division of log facies; built up a fine log interpretation models based on sedimentary microfacies of different layer systems; and fine log interpretation according to microfacies of different layer systems. The results showed that it was a favorable way to accurately calculate the reservoir parameters by the log interpretation based on sedimentary microfacies of different lay system.
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2013, Vol. 34 
