鄂尔多斯盆地延长组深水岩相发育特征及其石油地质意义

鄂尔多斯盆地湖盆中部地区三叠系延长组长7油层组广泛发育深水沉积。沉积物的粒度、沉积结构与构造、有机地球化学等特征研究表明，深水沉积岩可划分为四种岩相类型，分别为油页岩岩相、暗色泥岩岩相、砂质泥岩与泥质砂岩岩相和砂岩岩相。其中，油页岩岩相有机碳含量高，有机质类型好，测井曲线具有高阻、高伽马、低电位和时差跳跃频繁等特征；暗色泥岩岩相具有富含有机质、中低阻、中高伽马、高密度和高时差等特征；砂质泥岩与泥质砂岩岩相具有中电阻、低伽马、高密度、时差跳跃频繁等特征，泥质含量 20~70%；砂岩岩相表现出低的电阻、时差和伽马、泥质含量小于20%的特征，并刻画了各种深水岩相的剖面发育特征。深水斜坡带和湖底平原区的岩相组合存在较大的差异。深水岩相对非常规油气资源意义重大，其中油页岩岩相和暗色泥岩岩相为盆地中生界主力烃源岩，深水砂岩岩相是盆地大规模致密油的重要储集体，砂质泥岩与泥质砂岩岩相、暗色泥岩岩相富含丰富的页岩油资源，也具有潜在经济价值。

Geochemical tracing and modeling of surface and deep water–rock interactions in elementary granitic watersheds(Strengbach and Ringelbach CZOs, France)

From the study of the Strengbach and Ringelbach watersheds we propose to illustrate the interest of combining the geochemical tracing and geochemical modeling approaches on surface and deep borehole waters,to decipher the diversity of the water flow and the associated water–rock interactions in such elementary mountainous catchments. The results point to a clear geochemical typology of waters depending on the water circulations(deep vs. hypodermic) within the substratum.