tailieunhanh - Groundwater Geophysics Phần 9

Các nguyên tắc địa chất có thể ứng dụng trong các vấn đề về môi trường như khôi phục dòng chảy, phục hồi các vùng đất bỏ hoang, và hiểu các tương tác giữa môi trường sống tự nhiên và môi trường địa chất. | 438 . Mabrouk . Abu Ashour . Abdallatif . Abdel Rahman at VES 11. This resistivity range represents according to geologic evidence the upper part of chalky limestone layer related to the Senonian Upper Cretaceous . The thickness of the layer is nearly uniform throughout the area where it ranges from 46 m to m. At VES 14 the layer decreases in thickness to reach m. 6 The sixth layer is characterized by low resistivity that changes within narrow range Qm . At VES 14 the layer showed higher resistivity value 17 Qm . According to the geologic information this resistivity represents a layer that is mainly composed of argillaceous limestone. The anomalous resistivity value at VES 14 is due mainly to the decrease of the argillaceous material within this layer at the location of this sounding. The layer exhibits a uniform thickness ranging from 12 m to m. 7 The seventh layer attains resistivity values that vary from 32 Qm to 175 Qm. Nevertheless at most of the soundings the resistivity of this layer lies within the range from 40 to 80 Qm. This range is greatly similar to that of the fifth layer. According to the data of the wells this layer corresponds to the lower part of the chalky limestone layer which has the same composition of the fifth layer. The base of this layer has not been reached at many of the sounding stations. However the detected thickness at the other soundings has been found to be uniform 23- 24 m . 8 The eighth layer has been recorded at six soundings with relatively low resistivity - Qm . Disregarding the extreme resistivity values the resistivity of this layer in most cases lies within the range from 12 to 16 Qm. According to the geological data this layer corresponds to soft chalky limestone related to the Lower Senonian Upper Cretaceous . The thickness of the layer where it is detected ranges from to m. 9 The ninth layer attains resistivity variations from to 95 Qm. However at most of the