This study was conducted to obtain the characteristics of the source rock through organic geochemical analysis in Central Deep, NE Java Basin, in the field off the north coast of Madura. Three samples of Cassiopeia-1, Pollen-1, and Alpha-1 wells were analyzed using organic geochemical methods including Total Organic Carbon analysis, Maturity using vitrinite reflectance, Tmax, and Production Index data, and then analysis of the kerogen type, isoprenoid, sterane, and carbon isotope. Based on those data, an analysis was carried out to determine the origin of the material and the depositional environment. The rock samples in the three wells showed characteristics in TOC, maturity, kerogen type and source of organic material have a similarity. The source rock characteristics have a medium to a good category as source rock and tend to generate gas and a little oil from kerogen types II and III. This source rock is included in the category of immature to mature, deposited in delta until terrestrial depositional environment and contains sources terrestrial and marine organic material.Keywords: Madura, North East Java Basin, organic geochemical, source rock.

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This study presents petrophysics analysis results from two wells located in the Arafura Basin. The analysis carried out to evaluate the reservoir characterization and its relationship to the stratigraphic sequence based on log data from the Koba-1 and Barakan-1 Wells. The stratigraphy correlation section of two wells depicts that in the Cretaceous series a transgression-regression cycle. The petrophysical parameters to be calculated are the shale volume and porosity. The analysis shows that there is a relationship between stratigraphic sequences and petrophysical properties. In the study area, shale volumes used to make complete rock profiles in wells assisted by biostratigraphic data, cutting descriptions, and core descriptions. At the same time, porosity shows a conformity pattern with the transgression-regression cycle.Keywords: petrophysics, reservoir characterization, Cretaceous, transgressive-regressive cycle

Determination of reservoir rock properties is very important to be able to understand the reservoir better. One of these rock properties is permeability. Permeability is the ability of a rock to pass fluid. In this study, the calculation of permeability was carried out using log and PGS (Pore Geometry Structure) methods based on core data, logs, and CT scans. In the log method, the calculation of permeability is done by petrophysical analysis which aims to evaluate the target zone formation in the form of calculation of the distribution of shale content (effective volume), effective porosity, water saturation, and permeability. Next, the determination of porosity values from CT Scan. Performed on 2 data cores of 20 tubes, each tube was plotted as many as 15 points. The output of this stage is the CT Porosity value that will be used for the distribution of predictions of PGS permeability values. In the PGS method, rock typing is based on geological descriptions, then calculation of permeability predictions. Using these two methods, permeability can be calculated in the study area. The results of log and PGS permeability calculations that show good correlation are the results of calculation of PGS permeability. It can be seen from the data from the calculation of PGS permeability approaching a gradient of one value with R2 of 0.906, it will increasingly approach the core rock permeability value. Whereas the log permeability calculation for core rock permeability is 0.845.

Dimetileter memiliki bilangan oktana tinggi dan sifat mirip dengan LPG, dapat digunakan sebagai bahan bakar diesel untuk mobil dan LPG alternatif untuk rumah tangga. Reaksi sintesis DME merupakan reaksi kesetimbangan yang dipengaruhi oleh kemampuan aktivitas katalis. Penanganan panas hasil reaksi dapat berpengaruh pada terbentuknya reaksi sekunder, sehingga mengurangi pembentukan DME. Dalam penelitian telah dicoba proses sintesis dengan 2(dua) reaktor yang berbeda yaitu reaktor CSTR (Continuous Stirer Tank reactor) dan PFR (Flug Flow Reactor) untuk mempelajari kemampuan katalis sintesis DME. Maksud dan tujuan penelitian ini adalah mendapatkan teknologi sintesis DME dengan menggunakan reaktor CSTR dan PFR, serta mempelajari kinerja katalis terhadap produk DME pada reaktor tersebut. Katalis yang digunakan terdiri dari katalis sintesis metanol Cu/ZnO/Al 2 O 3 dan katalis dehidrasi ƴ-Al 2 O 3 , HZSM-5. Uji kinerja katalis DME kopresitasi pada reaktor CSTR menghasilkan hidrokarbon ringan (54,52%), metanol (25,15 %), dan DME (10,10%). Panas reaksi berlebih pada reaktor CSTR menurunkan aktvitas katalis dehidrasi. Sedangkan pada reaktor Plug Flow Reactor (PFR) dengan sistem unggun katalis fixed bed katalis ko impegrasi memberikan komposisi produk DME yang baik yaitu DME (88 %), metanol (10 %), dan sedikit hidrokarbon ringan (2%). Reaktor PFR memberikan penanganan panas yang lebih baik, dan mampu memberikan produk reaksi lebih baik dari pada reaktor CSTR.