Pembuatan Model Geologi Bawah Permukaan dengan Metode Geolistrik Dan Studi Stratigrafi pada Rembesan Gas DiJatilawang, Banyumas
Abstract: 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.
Keywords: BanyumasBasin,
Subsurface geological model, Geoelectrical Method, Stratigraphic Study,
Banyumas Gas Seep
Penulis: Eko Bayu
Purwasatriya, Gentur Waluyo
Kode Jurnal: jptindustridd110165