鄂尔多斯盆地北部上古生界油气运聚特征及其铀成矿意义

鄂尔多斯盆地北部上古生界储层流体包裹体类型、均一温度、捕获压力及其变化的研究表明,上古生界液态烃和天然气具有长期运聚两期充注的特点,捕获压力在平面上为南高北低、北东部最低,成藏后大量天然气散失和油气向北东方向迁移,及砂岩型铀矿的地球化学特性等暗示油气可能为东胜大型铀矿的形成提供了必要条件。

Characteristics of Migration and Accumulation of Hydrocarbon and Its Deposit-forming Signification in Upper Paleozoic in North Ordos Basin.

The characteristics of types, homogenisation temperature, capturing pressure of inclusions were studied in reservoir of Upper Paleozoic in northern Ordos Basin. It is indicated that there were a long-range migration and twice accumulations of liquid and gaseous hydrocarbons in Upper Paleozoic reservoir. The paleopressure of inclusions is high in south part, low in north part, and highest in northeast part. The large numbers of nature gas and oil were migrated and were dissipated to the northeast direction after migrating. The hydrocarbons could afford the necessary conditions of formatting the great uranium deposit in Dongsheng based on geochemistry character of uranium.