Abstract
<p>Banyumas basin is oneof sedimentary basin inIndonesia whichhasn’t proven yet its economical hydrocarbonreserves, although there are several oil and gas seeps in this area which is indicate mature source rocks had been migrated. One of itsgas seep is located on Karanglewas village, Jatilawang, Banyumas which hadbeen flowing its gases since tens years ago. Geoelectrical method and Stratigraphic studyare the methods usedin this research to built a geological subsurface model of Jatilawang’s gas seep.Geoelectrical method isintent to finding the distribution of gas seep over the area and also to finding the direction of fault structure which can be act asa path for gases to flowing up. Stratigraphic study comprise of lithology description, strike and dip measurement, and study of other secondary geological data. Interpreted subsurfacegeological model showing that sandstone dominated bed of Halang Formation is filled by gases and become gas pockets near the surface. Fault direction also interpreted from correlation of these gas pockets and resulting directionof N 115° E and dip of fault plane is45°.Gas flowing through fault and probably the source comes from gas cap of Jatilawang’s anticline. Predicted location of gas cap is about 610 meters to the south, and depthabout 620 meters.</p>
Highlights
Daerah Banyumas dan sekitarnya banyak terdapat rembesan minyak dan gas
of its gas seep is located on Karanglewas village
Banyumas which had been flowing its gases since tens years
Summary
Dari data-data hasil studi pendahuluan, survai geolistrik dan studi stratigrafi, maka kemudian dilakukan interpretasi mengenai model geologi bawah permukaan dari rembesan gas di daerah tersebut. Survai geolistrik dilakukan dengan cara memasang transmitter yang berupa sumber arus listrik yang disalurkan melalui kabel ke elektroda. Alat receiver yang berupa elektroda yang cukup peka, akan mendeteksi adanya perbedaan potensial dari lapisan-lapisan tanah yang dilalui oleh arus yang telah diinjeksikan oleh transmitter. Beda potensial inilah yang kemudian dicatat dan dihitung nilai resistivitas dari medium dibawah permukaan bumi. Hasil dari survai geolistrik ini kemudian akan diproses dan di analisis untuk mengetahui adanya anomali resistivitas dibawah permukaan yang menunjukkan indikasi kandungan gas dalam batuan. Hasil dari pengamatan lapangan ini akan dianalisis untuk menentukan apakah adanya potensi reservoir dan rekonstruksi struktur yang memungkinkan sebagai perangkap potensi gas tersebut
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
