Logging Identification and Distribution of Bauxite in the Southwest Ordos Basin

In recent years, with the discovery of oil and gas in Carboniferous bauxite reservoir Ordos basin, formation distribution reservoirs have attracted attention explorers. Based on slightly equidistant core testing minerals porosity calibration logging curves, we established a identification method for study area fitted formula calculating diaspore content using data. By applying this large amount data, thickness maps Taiyuan southeastern part basin were produced. Then, according to earliest deposited unconformity surface, analyzed paleogeomorphology deposition. Finally, sedimentary facies map was developed based sandstone, coal seams, carbonate rocks contained there. The results show that is positively correlated natural gamma (GR) values. According contents GR values, aluminiferous can be divided into three categories: ① Bauxite values > 450 API >70%; ② Argillaceous = 300–450 25%–70%; ③ Bauxitic mudstone 220–300 0%–25%. mainly occurred middle deep lagoon environments lower formation. distributed along paleokarst groove NW strike, width approximately 30–40 km length 150–200 km, among which pure 9 m, argillaceous 26 m alumina 6 m. high existed bauxite. gradually changes upward tidal flat swamp platform environment.