Logging Evaluation Of Carbonate Reservoir On Yan’an Group Of L7Erea In Longdong Oil Field

Along with the further oilfield development, initial mining mode of part new blocks already can not adapt to the present situation, current situation of great reservoir decline rate is still severe, so, it is necessary to enhance the research of such reservoir log evaluation, to further reinforce oilfield productivity, and to provide important theoretical basis for further optimization of exploration prospects in Longdong regionThis paper firstly adopt high-resolution sequence stratigraphy to divided into Yan-10subsection of the Yan’an Formation three layers, and to establish framework of isochronous stratigraphic correlation; tectonic characters are researched by tectonic maps, and we think Yan-10reservoir of L7block is structural-lithologic reservoir controlled by pale geomorphology; using the core materials, this block belongs to delta plain-braided channel facies which divided into distributaries’ channel, levee, flood land, sources come from northeast direction of studying area; Apply a variety of methods to ascertain dividing standards of isolated interbeds, interlayers in each substratum lack of development in Yan-101reservoir group, reservoir present medium heterogeneity; The analysis data of physical properties statistically demonstrate15.3%of average porosity and14.7×10-3μm2of permeability respectively; study on4-proporty relationship of Yan-10reservoir obtain discretion criterion of oil-water layer evaluation; based on analysis results from logging data, testing and production materials, getting minimum standard of effective thickness of oil layers, and model of well logging reservoir parameters interpretation of Yan-10reservoir; applying artificial neural networks to testing data and initial logging interpretation, predicting and evaluating the intervals whose well test data incorrespond to logging interpretation results, which have desired accordance rates.On the basis of above research fruits and previous researches about small-medium sandstone reservoir with low scope tectonic, the author believe this thesis basically establish evaluation system for small-medium sandstone reservoir with low scope tectonic.