The Research Of Enrichment Regularity For Chang7Oil Layer In Zhidan Region

With the recent level of exploration continues improving in Ordos Basin region，theTirassic Yanchang seven strata continues to ifnd oil and gas shows that it made somebreakthroughs on the hoirzon。It has become one of an important post-production increasingreserves succeed layers in the Pill region? But now the enrichment regularity of oil reservoir isnot clear enough and the irsk of the exploration is very high and it limited the depth ofexploration work.It’s deadly need to solve.This paper carried the research of stratigraphic correlation, sedimentary facies, theunderstanding of the reservoir characteirstics, study of sand body，reservoir characteristicsand types to predict the target areas that is favorable for the exploration.The results of whichcan effectively guide the post-exploartion work in the area. First, it can help understand thegeneral situation of regional geology, find out the stTatigraphic sequence and the feature ofevolution in the study areajenow about the sign of the stratigraphic division in the study area,establish criteira for the classification stratigarphic wells, the wells have been drilled bycontrast division. Secondly, according to the research of sedimentary facies strata and the ofdivision sedimentary facies identiifcation mark and rock type, lithology combination, we cananalyse the sedimentary facies, sedimentary environment and planar distribution trends ofh1ead long7~1, long7~2，long7~3raw a diagram of sedimentary facies for the three small layers.Then wc can have acomprehensive research on the reservoir characteirstics and sanddistirbution. And we can have a further study on reservoir rock characteirstics, pore type andphysical characteirstics, of Chang7.Draw a diagram of sedimentary facies for the three smalllayers.Then we can predict the favorable reservoir zones according to reservoir evaluationcriteira. Finally,evaluate the favorable exploration target areas of the three small layers whichis based on the research results.Make a comprehensive evaluation of10I、II、III classfavorable exploration target areas, an area of365km2,...