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Yosar Fatahillah

Institut Teknologi Sepuluh Nopember

Author-ID : 2774550

Earth & Planetary Sciences Education Engineering

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Penentuan Potensi Batuan Induk Menggunakan Model Log Toc Pada Formasi Ngimbang, Lapangan “Arrazi”, Cekungan Jawa Timur Utara Yosar Fatahillah; Anik Hilyah; Widya Utama
Jurnal Teknik ITS Vol 5, No 2 (2016)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Abstrak - Analisa laboratorium telah membuktikan Formasi Ngimbang sebagai batuan induk yang relatif kaya kandungan organik, ketersediaan data laboratorium terbatas untuk mengukur distribusi kematangan dan kuantitas material organik dalam skala luas cekungan regional. Hal inilah yang menjadi tujuan utama dalam penelitian ini. Dengan demikian dibutuhkan suatu metode sederhana yang terbukti dan akurat mengukur TOC (kandungan karbon organik) pada seluruh kedalaman lubang bor. Penelitian ini mengamati perilaku TOC Model berdasarkan data log sumur. Dengan demikian, akan menghemat banyak waktu dan menekan biaya observasi. Dalam penelitian ini, digunakan metode Passey untuk menentukan besar kandungan karbon organik pada formasi (TOC) dan model Mallick-Raju sebagai indikator kematangan formasi.. Tersedia satu data sumur dan data batuan inti yang digunakan untuk menentukan potensi batuan induk di formasi Ngimbang, Nilai LOM (Tingkat Metamorfisme) diperlukan untuk digunakan pada Passey Model dengan menggunakan crossplot antara DlogR dan TOC dari data inti. Hasil memperlihatkan formasi Ngimbang merupakan formasi dengan rerata kandungan TOC berada pada tingkat buruk – cukup baik dengan tingkat kematangan immature hingga post mature Kata kunci— TOC, Vitrinite Reflectance, Vshale, ΔLogR

Determination Of Source Rock Potential Using Toc Model Log, Ngimbang Formation, North East Java Basin Yosar Fatahillah; Widya Utama; Anik Hilyah; Kukuh Suprayogi
Jurnal Geosaintek Vol 2, No 2 (2016)
Publisher : Institut Teknologi Sepuluh Nopember

Ngimbang Formation is known as one major source of hydrocarbon supply in the North Eastern Java Basin. Aged Mid-Eocene, Ngimbang is dominated by sedimentary clastic rocks mostly shale, sandstone, including thick layers of limestone (Mostly in Lower Ngimbang), with thin layers of coal. Although, laboratory analyses show the Ngimbang Formation to be a relatively rich source-rocks, such data are typically too limited to regionally quantify the distribution of organic matter. To adequately sample the formation both horizontally and vertically on a basin–wide scale, large number of costly and time consuming laboratory analyses would be required. Such analyses are prone to errors from a number of sources, and core data are frequently not available at key locations. In this paper, the authors established four TOC (Total Organic Carbon Content) logging calculation models; Passey (1990), Schmoker-Hester (1983), Meyer-Nederloff (1984), and Decker/ Density Cross plot Model (1993) by considering the geology of Ngimbang in North Eastern Java Basin. Three wells data along with its available core data was used to determine the most suitable model to be applied in the formation, as well as to compare the accuracy of these TOC model values. Cutoff value of 1.5 in deviation was applied to quantify the minimum amount of acceptable error. This cutoff value was applied based on the standardized TOC model to core deviation used for qualitative interpretation column to scaling ratio. Since, Meyer-Nederloff model couldn’t be used to determine the TOC value as other three models, this model was only used as standard comparison model.

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