KOMPARASI LITOLOGI BAWAH PERMUKAAN ANTARA METODE GEOLISTRIK TAHANAN JENIS KONFIGURASI SCHLUMBERGER DENGAN DATA BOR DI KAWASAN PESISIR SELATAN KABUPATEN BANTUL

Muhammad Munajat, NIM.: 18106020033 (2023) KOMPARASI LITOLOGI BAWAH PERMUKAAN ANTARA METODE GEOLISTRIK TAHANAN JENIS KONFIGURASI SCHLUMBERGER DENGAN DATA BOR DI KAWASAN PESISIR SELATAN KABUPATEN BANTUL. Skripsi thesis, UIN SUNAN KALIJAGA YOGYAKARTA.

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Abstract

Comparative research of subsurface lithology between the Schlumberger configuration geoelectric method and drill data in the southern coastal area of Bantul Regency, namely Kretek and Sanden Districts has been carried out. The data used amounted to 18 data consisting of 7 primary data and 8 secondary data, as well as 3 drill data sourced from BMKG. The purpose of this study is to compare the results of the 1D subsurface lithology model from geoelectric data and drill data. 1D subsurface lithology modeling uses Progress software, the input parameters are electrode spacing, apparent resistivity value, layer depth, and resistivity value for each depth layer. The results showed that the results of the 1D subsurface lithology model for geoelectric data have the same results as the drill data, which is characterized by the resistivity value of the rock for each layer and the calculation of the coefficient of determination which shows the calculation results are y = 1.2029x - 3.1102 with R2 = 0.8802, y = 0.7968x + 3.4053 with R2 = 0.8410, and y = 1.2432x + 13.946 with R2 = 0.9929. The types of rock that are read from the resistivity values in this study are resistivity values of 1 to 15 Ωm is top soil, resistivity value 1 to 20 is a clay , resistivity value 1 to 50 Ωm is clay sand , resistivity value 10 to. 100 Ωm is a sand , and the resistivity value is 100 to 600 Ωm is sand gravel.

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