Identifikasi Kondisi Bawah Permukaan Daerah Pengeboran Kecamatan Tanggulangin Sidoarjo Menggunakan Metode Geolistrik Resistivitas Wenner-Schlumberger

Iwan, Febyana Nur (2021) Identifikasi Kondisi Bawah Permukaan Daerah Pengeboran Kecamatan Tanggulangin Sidoarjo Menggunakan Metode Geolistrik Resistivitas Wenner-Schlumberger. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

Text 03411740000008-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only until 1 October 2023. Download (2MB) | Request a copy

Abstract

Kecamatan Tanggulangin merupakan salah satu daerah yang termasuk kedalam area pengeboran dengan jarak paling dekat dengan semburan Lumpur Sidoarjo (LUSI) dibandingkan area pengeboran lainnya. Pada tahun 2020 daerah sekitar sumur pengeboran yaitu Desa Banjarasri dan Desa Penatarsewu mengalami peristiwa banjir pertama kalinya. Menurut penelitian dengan menggunakan data InSAR menunjukkan bahwa daerah tersebut mengalami peningkatan skala penurunan tanah pada akhir tahun 2019. Oleh sebab itu, maka perlu dilakukan penelitian untuk mengetahui kondisi bawah permukaan berupa jenis litologi serta struktur geologi seperti rekahan pada daerah sekitar pengeboran dengan menggunakan metode geolistrik resistivitas 2D konfigurasi Wenner-Schlumberger dengan jumlah lintasan sebanyak 4 lintasan yang terbagi di 3 desa yang mengalami penurunan tanah. Berdasarkan hasil penelitian menunjukkan bahwa daerah pengukuran tersusun oleh lapisan lempung lanau dengan nilai resistivitas 13.7 – 56.1 Ωm pada kedalaman 1 .25 – 9.44 meter, lapisan lempung lanau lunak dengan nilai resistivitas 2.51 – 10.245 Ωm pada kedalaman 1.25 – 12.4 meter dan 19.8 – 39.4 meter, lapisan lempung lanau sangat lunak dengan nilai resistivitas 0.406 – 1.66 Ωm pada kedalaman 6.38 – 39.4 meter. Selain itu, ditemukan dugaan adanya rekahan pada daerah penelitian didominasi pada kedalaman rata-rata 6.38 – 19.8 meter dengan nilai resistivitas ≤10.245 Ωm yang memiliki arah dominan timur laut – barat daya. Ditemukannya adanya rekahan menandakan bahwa telah terjadi pergerakan lapisan batuan bawah permukaan pada daerah penelitian.
====================================================================================================
Tanggulangin District is one of the areas in the drilling area with the closest distance to the Sidoarjo Mudflow (LUSI) compared with other drilling areas. In 2020 the area around the drilling well, Banjarasri Village and Penatarsewu Village experienced their first flood. According to the research that using InSAR data, it shows that the area experienced an increase in the scale of land subsidence at the end of 2019. Therefore, it is necessary to do a research to determine subsurface conditions in the form of lithological types and geological structures such as fractures in the area around drilling using 2D resistivity geoelectric method with the Wenner-Schlumberger configuration with a total of 4 paths, divided into 3 villages that experiencing land subsidence. Based on the results of the study, it showed that the measurement area composed of a layer of clayey silt with a resistivity value of 13.7 – 56.1 Ωm at a depth of 1.25 – 9.44 meters, a soft clayey silt layer with a resistivity value of 2.51 – 10.245 Ωm at a depth of 1.25 – 12.4 meters and 19.8 – 39.4 meters, a layer of very soft clayey silt with a value of 0.406 – 1.66 Ωm at a depth of 6.38 – 39.4 meters. In addition, it was found that the alleged fracture in the research area dominated at average depth of 6.38 – 19.8 meters with a resistivity value of ≤10.245 Ωm which had a dominant direction of northeast – southwest. The discovery of suspected fractures indicates that there has been a movement of subsurface rock layers in the research area.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Geolistrik, Pengeboran, Penurunan Tanah, Resistivitas, Geoelectrical, Drilling, Land Subsidence, Resistivity
Subjects:	Q Science > QE Geology > QE601 Geology, Structural Q Science > QE Geology > QE604 Deformation
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Febyana Nur Iwan
Date Deposited:	26 Aug 2021 04:16
Last Modified:	26 Aug 2021 04:16
URI:	http://repository.its.ac.id/id/eprint/89476

Actions (login required)

View Item