Abstract
Administratively, the research area is located in around Cikopomayak Village, Jasinga, Bogor, West Java,Indonesia. Based on the Hydrogeological and Groundwater Basin Map, this research area was classied to non-potential groundwater basin. In addition, when the summer comes, the lack of water will be happened around the area. Consequently, the water reserve wasn't enough to fulll the necessity of freshwater. Thus, the research about identifying aquifer location was needed. This research aims to determine the depth and thickness of aquifer for the alternative ways to overcome the problem, particularly, for the Cikopomayak Village. Theresearch used the geophysical method by modeling the several data such as Geoelectric 1-D to know the aquifer location based on the section of medium resistivity value. Then, the geoelectric data was correlated to the borehole drilling data that is Gamma Ray (GR) Log, Spontaneous Potential (SP) Log, Resistivity Log, and the cutting data. Commonly, the most suitable lithology for an aquifer is sandstone because of its good characteristic of permeability and porosity. Logging data result will show the small value of GR log, SP Log lean-ing to the right, and low-value resistivity for indicating the aquifer zone. Based on geoelectric data, the research zone has 3 groups of resistivity value and lithology that are shaly clay-stone and siltstone with low-value resistivity (0-50 ohm.m), sandy claystone, medium sandstone, and coarse sandstone with medium value resistivity (50-150 ohm.m), fine sand-stone, sandy claystone, and andesite with high-value resistivity (> 150ohm.m). The aquifer system in the research area was classied into 3 groups that are aquifer, aquitard, andaquiqlud.
Highlights
Abstrak: Secara administratif, daerah penelitian termasuk ke dalam wilayah Desa Cikopomayak dan sekitarnya, Kecamatan Jasinga, Bogor
this research area was classified to non-potential groundwater basin
the lack of water will be happened around the area
Summary
Daerah Cikopomayak terletak pada 106o 26’ 32” BT sampai 106o 28’ 53” BT dan -6o 25’ 58” LS sampai -6o 28’ 0” LS. Daerah ini merupakan bagian dari Kecamatan Jasinga, Kabupaten Bogor, Provinsi Jawa Barat yang tergolong ke dalam wilayah Cekungan Air Tanah (CAT) Bogor. Seiring dengan pertumbuhan jumlah penduduk dan perkembangan infrastruktur, kebutuhan akan air bersih bagi warga di sekitar Desa Cikopomayak kian meningkat. Akuifer merupakan lapisan pembawa air yang terdapat di dalam tanah. Berdasarkan pengertiannya, akuifer yang baik memiliki sifat yang porous dan permeable agar dapat menyimpan dan meloloskan air dengan mempertimbangkan saturasi airnya. Akuifer dapat berupa batupasir karena sifatnya yang porous dan juga permeable. Hal ini tidak sebanding dengan kondisi geologi di daerah Cikopomayak yang didominasi oleh batulempung dan batulanau yang kurang porous dan cenderung impermeable. Oleh sebab itu, penting dilakukannya analisis distribusi akuifer untuk mengetahui persebaran dari air tanah beserta letak kedalamannya. Penelitian ini bertujuan untuk memodelkan geometri akuifer di sekitar Kecamatan Jasinga, CAT Bogor
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