916 Jurnal Indonesia Sosial Teknologi: p–ISSN: 2723 - 6609 e-ISSN : 2745-5254 Vol. 2, No. 6 Juni 2021 PENGARUH CHALKY PADA POROSITAS DAN PERMEABILITAS RESERVOIR BATUGAMPING BERDASARKAN UJI LABORATORIUM SAMPEL CORE, DARI LAPANGAN “AR” Arief Rahman dan Rani Rahmawati Akamigas Balongan Indramayu Email: arief11rahman@gmail.com, raaniraahmawati2@gmail.com Abstract Reservoir rock porosity determines the volume of oil and gas reserves, while permeability is very important for the radius of oil and gas drain and recovery factor (RF). The purpose of this study is to determine the effect of depth on the porosity of limestone (limestone), the relationship between porosity and permeability, and to determine the effect of the presence of chalk on the sample. core plug limestone on the value of porosity and permeability. The research method used is a Lab Test conducted at theLaboratory Routine Core Analysis (RCAL) at PPPTMBG “Lemigas” Jakarta. The materials used are 21 (twenty one) samples core plugs taken horizontally, described, and ready to be tested, from samples conventional core of a limestone reservoir containing oil (oil reservoir), from the “AR” field. The research steps are measuring the value of porosity (ø) and permeability (k) using a porosimeter-permeameter with helium gas, then plotting a graph of the measurement results, for analysis. As a result,porosity measurements limestone without Chalky lowest at the highest 11.58% to 23.79%, or just(fair)to very good (verygood),while the porosity of limestone with a Chalky low of 29.20%highest sd 42, 12%, or special (excellent).permeability limestone without Chalky the lowestoft 0.5 mD highest sd 10.90 mD, or tight(tight)to fair (fair),while the permeability of limestone with a Chalky low of 38.4 Mdhighest sd Md 193.90, or both (good) to very good (very good). The conclusion of this study is that the porosity of carbonate rocks in this case is not affected by depth, the relationship between porosity and permeability in this case is exponentially proportional, and the porosity and permeability values of limestone with the presence of chalky are better than limestones without the presence of chalky. Keyword: chalky; porosity; permeability. Abstrak Porositas batuan reservoir menentukan jumlah volume cadangan migas, sedangkan permeabilitas sangat penting untuk radius pengurasan migas dan recovery factor (RF). Tujuan dari penelitian yaitu mengetahui efek kedalaman terhadap porositas batugamping (limestone), hubungan porositas dan permeabilitas, dan mengetahui efek/pengaruh adanya chalk pada sampel core plug batugamping terhadap nilai porositas dan permeabilitas. Metode penelitian yang digunakan adalah Uji Lab yang dilakukan di Laboratorium Routine Core Analysis (RCAL) di PPPTMBG “Lemigas” Jakarta. Bahan yang digunakan adalah 21 (dua puluh satu) sampel core