Studi geologi dan geokimia lapangan panas bumi "AL" , Kabupaten Muara Enim , Sumatera Selatan
L Lapangan panasbumi “Al†berada pada Kabupaten Muara Enim, ProvinsiSumatera Selatan. Kondisi geologi serta karakteristik geokimia yang menjadi objekyang diteliti pada lapangan panasbumi ini sehingga menghasilkan modelkonseptual panasbumi. Penggunaan metode pada penelitian dengan melakukananalisis geologi secara data permukaan serta analisis geokimia fluida dan gas dalampenentuan temperatur dan arah fluida panasbumi. Secara geomorfologi dibagimenjadi tiga satuan yaitu satuan geomorfologi perbukitan bergelombang vulkanik,satuan geomorfologi perbukitan tersayat tajam dan satuan geomorfologipegunungan tersayat tajam. Secara vulkanostratigrafi pada daerah penelitian dibagimenjadi lima satuan unit vulkanik. Sistem panasbumi, daerah penelitian termasukkedalam sistem high relief. Kehadiran manifestasi dikontrol oleh adanya strukturpada daerah penelitian. Terdapat tiga jenis manifestasi yang muncul dipermukaanyaitu manifestasi air panas dan fumarol. Tipe mata air panas yang muncul berupaair sulfat, air bikarbonat serta air klorida. Berdasarkan perhitungan geothermometerair lapangan panasbumi memeiliki temperatur sebesar 230C.Secara perhitungangeothermometer gas menghasilkan perkiraan temperatur sebesar 270C. Hasilperkiraan temperatur ini menunjukkan bahwa lapangan panasbumi ini termasukkedalam sitem panasbumi high temperature. Analisa isotop menunjukkan asalfluida panasbumi daerah penelitian yang dibagi menjadi tiga jenis yaitu meteoricwater, mixing dan andesitic water. Zonasi upflow terdapat pada bagian tengahdaerah penelitian sedangkan zona outflow menuju arah barat laut daerah penelitian.Secara geologi dan geokimia menunjukkan daerah terpanas terdapat pada unitsatuan yang muda pada unit vulkanostratigrafi B. Temperatur panasbumi mulaimengalami penurunan menuju bagian baratlaut yakni dimana struktur(permeabilitas) sebagai jalannya fluida panasbumi berpindah.
G Geothermal Field “Al†that located on Muara Enim regency, SouthSumatera province. Geological conditions and geochemical characteristics thatbecame the object under study in this geothermal field. The use of methods inresearch by conducting geological analysis of surface data fluid and gasgeochemical analysis in determining the temperature and direction of geothermalfluid Based on geomorphology is divided into three units of geomorphologicalunits of volcanic undulating hills, geomorphological units of sharply sloped hillsand geomorphological units of sharply cut mountains. Based on the outcrop datain the study area is divided into five units of vulkanostratigrafi. Based on thegeothermal system, the research area is included into the high relief system. Thepresence of manifestations is controlled by structures in the research area. Thereare three types of manifestations that appear on the surface of the manifestation ofhot water and steam vent. Types of hot springs that appear in the form of sulphatewater, bicarbonate water and chloride water. Based on geothermometercalculations geothermal field water has a temperature of 230C. Calculation of thegas geothermometer produces an estimated temperature of 270C. Thesetemperature estimates show that the geothermal field is included in the hightemperature geothermal system. The result of the isotope analysis shows the originof the geothermal fluid of the research area that is divided into three types, meteoricwater, mixing and andesitic water. Upflow zoning is located in the center of theresearch area while the outflow zone is heading northwest of the research area.Geologically and geochemically, the hottest regions are found in young unit unitsin volcanostratigraphy B. Geothermal temperatures begin to decline towards thenorthwest part, where structure (permeability) as the path of geothermal fluidmoves