为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......

Dinoflagellates are single celled organisms that reflect the ecological conditions in modem oceans and lakes. Their earl......

The distribution of "molecular fossils" (biomarkers) of steroid compounds in extracts from some specific geologic age in......

31 samples of shales and mudstones developed in reducing hypersaline and freshwater setting and 20 oil samples of Bamian......