Đảo ngược đồng thời dữ liệu DC/TDEM: một nghiên cứu trường hợp về vấn đề dịch tĩnh ở khu vực phía Bắc thành phố Tenth of Ramadan, Ai Cập

Arabian Journal of Geosciences - Tập 14 - Trang 1-12 - 2021
Mohamed Genedi1, Hosni Ghazala1, Adel Kamel Mohamed1, Usama Massoud2
1Geology Department, Faculty of Science, Mansoura University, Mansoura, Egypt
2National Research Institute of Astronomy and Geophysics (NRIAG), Cairo, Egypt

Tóm tắt

Kỹ thuật điện trở rời (DC) và điện từ miền thời gian (TDEM) đã cho thấy hiệu quả của chúng trong việc nghiên cứu các đặc điểm dưới bề mặt nông bao gồm cả nước ngầm. Mục tiêu chính của nghiên cứu này là thảo luận về vấn đề dịch tĩnh của dữ liệu DC được ghi nhận trong khu vực nghiên cứu, phía Bắc thành phố Tenth of Ramadan, Ai Cập. Việc đảo ngược đồng thời dữ liệu DC và TDEM giúp giải quyết vấn đề dịch tĩnh do các không đồng nhất gần bề mặt. Do đó, ba mươi hai phép đo cho mỗi phương pháp DC và điện từ tạm thời TDEM đã được thực hiện đồng thời trong khu vực nghiên cứu. Một yếu tố tỷ lệ dao động từ 1,14 đến 1,5 đã được áp dụng để khắc phục hiện tượng dịch tĩnh của dữ liệu DC. Kết quả đầu ra cho thấy năm lớp địa điện của các đơn vị đá Tân Minh đã biến đổi theo chiều ngang và chiều dọc về độ dày và thành phần khoáng vật từ cát mịn và sỏi với các lớp đất sét xen kẽ. Lớp thứ năm có thể đại diện cho cát bão hòa nước, đại diện cho tầng nước không bị giới hạn khi có điện trở dao động từ 3,5 Ω.m đến 21,7 Ω.m với độ sâu dao động giữa 51 m và 139 m. Độ sâu này cũng nhất quán với bối cảnh thủy văn của khu vực nghiên cứu (dao động từ 60 đến 80 m). Giá trị điện trở nói chung giảm về phía bắc do sự thẩm thấu nước mặt từ kênh tưới tiêu Ismailia. Phần phía nam của khu vực nghiên cứu bị ảnh hưởng bởi hai đứt gãy bình thường, điều này đã kiểm soát đáng kể sự rò rỉ nước đi lên và sự kết nối giữa các tầng nước ngầm Tân Minh nông và sâu.

Từ khóa

#kỹ thuật điện tử #nghiên cứu nước ngầm #phương pháp TDEM #phân tích địa điện

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