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"Media culture is one of the important factors in the growth of mivroalgae. Culture medium contains macro and micro nutrition required for the growth of microalgae. Composition of nutrition concentrations determine the production of microalgae biomass and nutrient content. The aim of this study is to evaluate the effect of medium composition of media for microalgae Scenedesmus sp. This study was conducted in a laboratory scale. The growth medium that were used in this tudy were BBL sm, SS, MN, M4N, "Sederhana 2", and "Sederhana 3" medium. The microalgae that were used in this study were mixed culture Chlorophyceae microalgae which is dominated by scenedesmus sp. The parameters observed were pH, optical density (OD), cell density and temperature. the results show that of the 6 variations of the growth medium used in this study M4N medium is the best medium for the growth of microalgae. At the end of the operation, cell density of Scenedesmus sp. from M4N medium was 306.83 x 106 cell/ML with a dark green color for the culture. The coefficient growth of Scenedesmus sp. which is grown in M4N medium was 0,36. This is likely to be due to the composition of nutrients in the medium M4N which were more complete than other media."

"ABSTRACTGamma ray log is a logging tool to capture the radioactive level of a rock or formation measured in API units. This logging tool generally has a capability to differentiate between permeable and impermeable layers. Usually the impermeable layer tends to have higher radioactivity compared to the permeable one except for the feldspar bearing formation. In addition, another capability of this logging tool is ti determine the kind of clay mineral by using ratio data between Thorium and Potassium. This laboratory experiment uses Spectral Gamma Ray Equipment at LEMIGAS Routine Core Laboratory. The Quality of gamma ray log measurement is significantly affected by the speed of the conveyor belt. During the experiment, the measurement speed of 30 m/hour is the optimum speed to achieve good quality data and time efficiency with the data amount of 169 points/meter. The result of SGR measurement gives the reading on the content of Uranium, Thorium, and Potassium. The Thorium and Potassium content are compared and plotted in a Quirein graphic which was modified by Schlumberger in 1985. Using this crossplot, we can identify the presence of the Chlorite, Montmorillonite, Kaolinite, Illite, mixed with layer Feldspar, Mica, Glauconite minerals and so on. A case study conducted on Wells A1, A2, A3, and A4 indicated that the result of this crossplot was similar to the measurement using XRD."

"A detailed combined geological and geophysical study in North Sumatra basin has shown that prospective formations for shale play containing gas sweet spots are found to be shales from Bampo, Belumai, and Baong Formations. Bampo Formations Exhibits low shale gas potential with very low to medium in organic material contents, maturity index of immature to mature, and moderate brittleness. Rocks within the formation tent to be reactive to highly reactive to water, with a moderate degree of swelling capacity. Porosity varies within 5.8-7.4% with permeability raging from 0.37 to 3.2 mD. Sweet spots in the formation found around Basilam-l and Securai-l wells occupy about 21% of the formation. On the other hand, Belumai Formation shows moderate to good shale gas potential, with low to high organic material contents, immature to mature levels of maturity, and moderately brittle to brittle. Sweet spots areas in the formation fpund around the two wells are about 29% of the formation. For Baong Formation, analysis reveals moderate to good shale gas potential, with low to medium contents of organic material, immature to mature in maturity index, moderately brittle to brittle in brittleness, and tendency of being reactive to highly reactive to water but with low degree of swelling capacity. Sweet spots in the formation found around two wells occupies are roughly 11% of the total formation volume in the area. Basin modeling leading to gas resources estimation for Baong, Belumai, and Bampo Formations has led to estimated volumes of 6, 379 TCF, 16, 994 TCF, and 25,024 TCF, respectively, with a total amount of 48, 397 TCF. The resources figures are speculative in nature and do not incorporate any certainty and efficiency factors."

"ABSTRACTSouth and Central Palembang Sub-basins have shale hydrocarbon which are considerably promising in the Talang Akar and Lemat/Lahat Formations. Seismic interpretation results shows potential of shale hydrocarbon scattered in several areas around the Rukam-l, Kemang-l, SInga-l and Tepus'l wells. Generally, thermal modelingg results indicate early maturity of oil on the value of Ro= 0.6% at about 2000m depth (h), the oil generation value Ro=(0.7-0.9)% at between (2200 £ h<3100)m depth and the oil generation Ro values between (0.9-1.2)% at a depth between (3100-3500m, Talang Akar and Lahat/Lemat Formations have a shallow marine depositional environment with Type II/III kerogen and lacustrine with Type III kerogen respectively. Based on advanced seismic data processing (seismic attributes and spectral decomposition) these areas are expected to have TOC>value2%. The calculation (P-50) of potential unconventional oil and gas recources at Talang Akar and Lahat/Lemat Formations is estimated to be fairly large (up tp 4200 MMBOE)(Author)"