Menipisnya jumlah cadangan minyak dan gas bumi konvensional menjadi landasan atas studi sumberdaya migas non-konvensional, salah satunya adalah organic shale sebagai alternatif untuk memenuhi kebutuhan energi fosil yang masih sangat tinggi di Indonesia. Cekungan Kutai Bagian Atas merupakan salah satu cekungan yang cukup tua dan satu dekade terakhir dilirik sebagai target organic shale. Formasi Batu Ayau yang berada di Cekungan Kutai Bagian Atas merupakan target utama sebagai potensi sumber daya organic shale dibuktikan dengan hasil analisa geokimia serta perannya sebagai batuan induk dalam sistem petroleum konvensional di Cekungan Kutai Bagian Atas. Interval organic shale dari Formasi Batu Ayau berada pada asosiasi fasies delta plain dan delta front dengan terdapat dua interval prospek didalamnya (BA3 & BA2). Analisa dilakukan menggunakan data dua sumur MAAU-1 dan TENGKAWANG-1 di Blok B Cekungan Kutai Bagian Atas. Analisa petrofisika secara umum untuk memperoleh nilai shale volume sebesar 50 − 60 %, porositas 8 − 30%, dan water saturation 60 − 70 %, hal ini kemudian diterapkan untuk identifikasi organic shale dengan mengoptimalkan penggunaan dari standard triple combo log. Pada organic shale petrofisika dilakukan untuk memperoleh hasil akhir besaran nilai TOC dan Brittleness Index (BI). Nilai TOC diperoleh dengan menggunakan metode Passey dengan diperoleh nilai 0.7 − 3.2 wt% dan nilai BI menggunakan metode Anderson yang diperoleh nilai 51 − 58 %. Dengan analisa tersebut diharapkan agar diperoleh hasil representatif dari kualitas organic shale berdasarkan metode petrofisika di Formasi Batu Ayau. AbstractAs the oil and gas conventional reserves are thinning thus becoming the stand reason for the study of non conventional hydrocarbons, one of them is organic shale as an alternative to fill the needs of fossil energy which still in high demands in Indonesia. Upper Kutai Basin is one of the oldest basin and in the last decade being proposed as organic shale target. Batu Ayau Formation located within this basin is the main target as organic shale resource which proven by geochemical analysis from laboratories and it is role as source rocks in conventional petroleum system in Upper Kutai Basin. Batu Ayau Formation interval of organic shale exist in facies association of delta plain and delta front with two prospect interval within (BA3 & BA2). Analysis using wells MAAU-1 and TENGKAWANG-1 in block B of Upper Kutai Basin. Petrophysical analysis normally being used to obtain the value of shale volume which 50 − 60 %, porosity which 8 − 30 %, and water saturation which 60 − 70 %, and then applied to identify the organic shale with optimizing the use of standart triple combo log. In organic shale the petrophysics is used to obtain final results of Total Organic Carbon (TOC) and Brittleness Index (BI). TOC value analyzed using Passey's with value achieves 0.7 − 3.2 wt% and BI using Anderson's with value achieves 51 − 58 %. From the analysis so hopefully can achieves a representative results of organic shale in Batu Ayau Forma...
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