[ABSTRAK
Formasi Baong bagian bawah bertanggung jawab sebagai batuan indukyang mengisi reservoar batupasir pada lapangan minyak dan gas di bagiantenggara Cekungan Sumatera Utara. Penelitian ini mengungkapkan data dan faktadari laboratorium, pengeboran, wireline well log dan seismik melalui studi analisapetrofisika, geokimia, geomekanika dan geofisika Formasi Baong bagian bawah.Pemahaman tentang geokimia, mineralogi dan geomekanika serpih sangat pentinguntuk memahami bagaimana reservoir serpih memiliki potensi untuk cadangandan produksi ketika dilakukan stimulasi. Analisis laboratorium geokimiadigunakan untuk menentukan kekayaan, kematangan dan kerogen tipe. Penelitianini mengklasifikasikan serpih berdasarkan kekayaan organik, kematangan, jenis,kekuatan serpih, kerapuhan serpih dan kandungan clay. Formasi Baong bagianbawah yang menjadi target pada studi ini terletak pada kedalaman 1778-2428 m(TVD), memiliki material organik yang kaya dengan TOC berkisar antara 1,88-3,85% wt, tingkat kematangan 12% sudah matang dan 88% belum matang, sertamenghasilkan 20% kerogen tipe III dan 80% kerogen tipe II/III sehingga dapatdijadikan sebagai batuan induk yang berpotensi menghasilkan gas dangas/minyak. Rigiditas Formasi Baong bagian bawah sangat sangat brittle denganmemiliki rata ? rata kandungan mineral kuarsa 33,7% dan mineral brittle sepertikalsit 8,8%, dolomit 1,8% dan siderit 0,9%, serta brittle 80% dan less brittle 20%,sehingga dapat dilakukan hyhraulic fracturing dengan baik. Nilai impedansiserpih Formasi Baong bagian bawah berkisar antara 20203 ? 24615 ((ft/s)*(g/cc)).
ABSTRACT
The Lower Baong Formation is responsible for source rock filled upsandstones reservoir in the oil and gas field in the southeastern part of NorthSumatra Basin. This study reveals the data and facts from the laboratory, drilling,wireline well logs and seismic through the analysis study of petrophysics,geochemistry, geomechanics and geophysics of Lower Baong Formation. Anunderstanding of shale geochemistry, mineralogy and geomechanics is veryimportant to understand how the shale reservoir has the potential to reserve andproduce when carried out stimulation. Geochemical laboratory analysis is used todetermine the richness, maturity and kerogen type. This study classify shale basedon organic richness, maturity, type, shale strengthness, shale brittleness and claycontent. The Lower Baong Formation being targeted in this study lies at a depthof 1778-2428 m (TVD), has a rich organic material with TOC ranging from 1.88to 3.85 wt%, the maturity level of 12% is mature and immature 88%, and generate20% kerogen type III and 80% kerogen type II / III so it can be used as a sourcerock potential to produce gas and gas / oil. Lower Baong Formation rigidity arevery brittle by having the averages 33.7% quartz mineral content and brittleminerals such as 8.8% calcite, 1.8% dolomite and siderite 0.9%, and brittle 80%and less brittle 20%, so it can be done hyhraulic fracturing very well. Sahle valuesof Lower Baong Formation bottom ranges from 20203-24615 ((ft/s)*(g / cc))., The Lower Baong Formation is responsible for source rock filled upsandstones reservoir in the oil and gas field in the southeastern part of NorthSumatra Basin. This study reveals the data and facts from the laboratory, drilling,wireline well logs and seismic through the analysis study of petrophysics,geochemistry, geomechanics and geophysics of Lower Baong Formation. Anunderstanding of shale geochemistry, mineralogy and geomechanics is veryimportant to understand how the shale reservoir has the potential to reserve andproduce when carried out stimulation. Geochemical laboratory analysis is used todetermine the richness, maturity and kerogen type. This study classify shale basedon organic richness, maturity, type, shale strengthness, shale brittleness and claycontent. The Lower Baong Formation being targeted in this study lies at a depthof 1778-2428 m (TVD), has a rich organic material with TOC ranging from 1.88to 3.85 wt%, the maturity level of 12% is mature and immature 88%, and generate20% kerogen type III and 80% kerogen type II / III so it can be used as a sourcerock potential to produce gas and gas / oil. Lower Baong Formation rigidity arevery brittle by having the averages 33.7% quartz mineral content and brittleminerals such as 8.8% calcite, 1.8% dolomite and siderite 0.9%, and brittle 80%and less brittle 20%, so it can be done hyhraulic fracturing very well. Sahle valuesof Lower Baong Formation bottom ranges from 20203-24615 ((ft/s)*(g / cc)).] |
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