Search Repository STTMIGAS Balikpapan

Penentuantekananbawahpermukaanpadasumurmerupakanfaktorpenentuyangmendukungkeberhasilansuatu operasi pemboran.Cekungan Tarakan sub basin yang menjadilokasipenelitianmemiliki hampir keseluruhan dari hasil dari endapan delta sehingga memiliki karakter formasi reservoir berupa perselang-selingan batupasir kuarsa dengan batulempungdengantekananutamaadalahtekananoverburdenyangmenjadiindikasi zona overpressureatauprimary overpressuredalamSubiatmono et al (2017).
DalamPenelitianinipenentuantekananporidantekananrekah menggunakan data log seperti gammaray, resistivity, density, mudlog dan LOT.
Dari hasilanalisa, diperolehnilairata-rata gradientekananporiadalah 0.594 psi/ftdannilai rata-rata gradientekananrekahadalah 0.851 psi/ft.nilaiinimengindikasikanzona overpressure yang disebabkanundercompaction shale. Inibertujuanmenghindarimasalahpemboranseperti, blow out, lost circulation, danrusaknya reservoir ataulubang bor.

Determination of buttomhole pressureis a determining factor that supported the success of a drilling operation. The sub basin of Tarakanbasin which is the location of the research has almost the entire result of the delta sedimentation so that it has the character of reservoir formation in the form of quartz sandstone interruptions with clay as the main pressure is the overburden pressure which indicates the overpressure or primary overpressure zone in Subiatmono et al (2017).
In this research, the determination of pore pressure and fracture formation pressure using log data such as gammaray, resistivity, density, mudlog and LOT.
From the analysis result, the average value of pore pressure gradient is 0.594 psi / ft and the average of fracture gradient is 0.851 psi / ft.this point be indication overpressure zone from undercompaction shale. This aims to avoid drilling problems such as, blow out, lost circulation, and damaged reservoir or borehole.