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"[ABSTRAKFormasi Toolachee memiliki penyebaran yang sangat luas di Cekungan Cooper.Padahal ketebalan Formasi Toolachee tidaklah begitu tebal dengan rata-rataketebalan berkisar hingga 300 m. Proses sedimentasi Fm. Toolachee secararegional berupa fluvial (meandering) dengan urutan batuan berupa batupasir,batulempung, batulanau, dan batubara. Batupasir Fm. Toolachee memilikiporositas yang sedang hingga bagus, sehingga dapat bertindak sebagai reservoiryang terbukti mengalirkan gas pada Sumur Meranji-1. Dengan asumsi bahwapenyebaran Fm. Toolachee luas dan terendapkan di semua daerah penelitian,seharusnya ditemukan juga kandungan hidrokarbon pada dua sumur lainnya, yaituCooba-1 dan Pelican-5. Kenyataannya, Cooba-1 dan Pelican-5 tidak ditemukankehadiran hidrokarbon, sekalipun Fm. Toolachee masih terbentuk disana.Hipotesis yang diangkat adalah bahwa ada kontrol stratigrafi yang berpengaruhterhadap akumulasi hidrokarbon pada Fm. Toolachee. Dari hasil analisis sumurdan seismik yang dibantu dengan atribut seismik dan inversi seismik ditemukanadanya perubahan fasies pada zona reservoir di Meranji-1. Zona reservoir terlihattidak memiliki kemenerusan antara Meranji-1, Cooba-1 dan Pelican-5. Penelitianini menghasilkan penyebaran fasies secara lateral dan vertikal pada Fm.Toolachee. Oleh karena itu, sumur-sumur selanjutnya diharapkan mengikuti polapenyebaran fluvial dari batupasir zona target.

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ABSTRACTToolachee Fm has widespread deposition which is formed widely in CooperBasin. Although, Toolachee Fm is thin bed formation with thickness averaging300-400m only. Sedimentation process in Toolachee Fm is controlled by fluvialsystem which is formed in meandering depositional environment with lithologyconsists of sandstone, shale, siltstone, and coal. Sandstone of Toolachee Fm hasmoderate to good porosity, therefor it can act as reservoir which is proven byflowing gas in Meranji-1 well. Based on assumption of widespread depositional ofToolachee Fm, hydrocarbon accumulation shall be found in two wells, Cooba-1and Pelican-5. In fact, Cooba-1 and Pelican-5 do not encounter significanthydrocarbon in Toolachee Fm. Hypotehsis were made that stratigraphy has animportant influence of hydrocarbon accumulation in Toolachee Fm. Study result,from integrated study well and seismic interpretation which is supported byseismic stratigraphy, attribute seismic and seismic inversion, show facies changein Toolachee resulting truncated sand body. This study produces a comprehensivefacies distribution both laterally and vertically. Therefor, next well should bedrilled along channel geometry, Toolachee Fm has widespread deposition which is formed widely in CooperBasin. Although, Toolachee Fm is thin bed formation with thickness averaging300-400m only. Sedimentation process in Toolachee Fm is controlled by fluvialsystem which is formed in meandering depositional environment with lithologyconsists of sandstone, shale, siltstone, and coal. Sandstone of Toolachee Fm hasmoderate to good porosity, therefor it can act as reservoir which is proven byflowing gas in Meranji-1 well. Based on assumption of widespread depositional ofToolachee Fm, hydrocarbon accumulation shall be found in two wells, Cooba-1and Pelican-5. In fact, Cooba-1 and Pelican-5 do not encounter significanthydrocarbon in Toolachee Fm. Hypotehsis were made that stratigraphy has animportant influence of hydrocarbon accumulation in Toolachee Fm. Study result,from integrated study well and seismic interpretation which is supported byseismic stratigraphy, attribute seismic and seismic inversion, show facies changein Toolachee resulting truncated sand body. This study produces a comprehensivefacies distribution both laterally and vertically. Therefor, next well should bedrilled along channel geometry]"

"Nenering Formation is essentially made up of semi-consolidated sediments, which are divided into basal conglomerate beds, conglomeratic sandstone, cross-bedded sandstone, and siltstone to muddy layers facies. It is overlie unconformable to the Berapit Formation, but conformable to the Kroh and Grik Formations. The stratigraphy of Nenering Formation is a fining upwards sequence where the thickness of conglomerate beds become thinner upwards and become thicker for conglomeratic sandstone. The thickness varies from 0.5 m to tenths of meters. The more sandy in the upper portion (cross-bedded sandstone) overlie with thin siltstone and mudstone facies. The clast and grain composition suggested that the material making up the sedimentary sequence were derived predominantly from the erosion of granitoid rocks and sedimentary and metamorphic rocks constitute a minor provenance. Imbrications and the trend sizes of clasts indicate that the palaeo-current flow toward northeast. Cross bedding that was found in conglomerate and sandstone indicates the main channel depositional environment. The sequence stratigraphy of this area match with the Saskatchewan fluvial braided channel model."

"Pada lapangan Meranji terdapat tiga sumur yang ketiganya menembus formasi Namur, tetapi hanya sumur Meranji-1 yang mengalirkan hidrokarbon minyak dari formasi Namur. Kebutuhan mengenai informasi geologi regional menjadi dasar atau batasan berpikir penulis sekaligus acuan dalam memetakan persebaran fasies pada lapangan ini. Sebagai dasar dalam pembuatan model properti batuan, perkembangan fasies perlu diketahui secara rinci dengan menggunakan pendekatan data geologi regional, data seismik, data sumur, dan juga data pendukung lainnya. Pemodelan dan karakterisasi reservoar di lapangan Meranji pada formasi Namur meliputi distribusi fasies dan distribusi properti reservoar di formasi tersebut. Persebaran batupasir dan persebaran properti reservoar Namur secara lateral dipandu oleh atribut seismik dan impedansi akustik hasil inversi seismik. Hasil pemodelan menunjukkan bahwa unit batupasir yang paling tebal, morfologi chanel yang terpotong atau tidak menerus atau tidak berkembang ke sumur Cooba-1 dan Pelican-5, arah pengendapan chanel fasies batupasir dari timur laut menuju ke barat daya berkumpul ke sumur Meranji-1 dan persebaran lateral AI yang rendah membentuk suatu lensa yang menipis, kemungkinan tidak berkembang ke arah dua sumur lainnya, analisis ini mendukung hipotesa mengapa hanya pada sumur Meranji-1 mengalir hidrokarbon.

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On Meranji field there are three wells penetrated Namur Formation, but only Meranji-1 well that drain oil hydrocarbons from the Namur Formation. The needs of the regional geological informations as author references or limitations to map the distribution of facies in this field. As a basis for modeling properties of rocks, facies development needs to be known in detail by using a regional geological data, seismic data, well data, as well as other supporting data. Modeling and reservoir characterization in Meranji field in Namur formations include the distribution of facies and reservoir properties distribution in Namur formation. Distribution of sandstones facies and reservoir properties laterally guided by seismic attributes and seismic acoustic impedance inversion results. Modeling results indicate that the unit sandstone thickest, morphology channels are truncated or not continuous or does not develop into a well Cooba-1 and Pelican-5, direction of deposition of sandstone facies channel from the northeast toward southwest converge into well Meranji-1 and distribution of lower AI laterally forming a lens thinning, may not evolve towards two other wells, this analysis supports the hypothesis why only on Meranji-1 well flowed hydrocarbons."