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Collection and analysis of well data is important process, allowing a reconstruction of the penetrated rocks. Numerous charts and diagrams illustrate all sorts of geological information. Some of them are demonstrated and generalized by well sections from south-western part of the Central North Bulgaria. Logs together with well core and cuttings are the bases for construction of a general Mesozoic lithostratigraphy column. Besides the major lithotypes the source rocks, reservoirs and seals are also outlined. Select...