batuan adalah suatu bahan alamiah yang terdiri dari suatu mineral maupun sekelompok mineral.Batuan yang paling menarik perhatian para ahli perminyakan yaitu batuan yang mengandungfluida (air, minyak dan gas), yang disebut sebagai batuan reservoir atau formasi. Batuan yang sangat penting dalam teknik perminyakan adalah batuan sedimen, karena hampir seluruh minyak dan gas bumi terakumulasi dalam batuan sedimen.
Batuan beku dan batuan metamorphic jarang sekali mengandung minyak dan gas, namun di jati barang Jawa Barat reservoir minyak dan gas di dapatkan dalam batuan vulkanis.
Adapun yang dimaksud sifat fisik batuan adalah semua sifat yang dimiliki formasi batuan dan yang berhubungan dengan ilmu mekanika, kelistrikan, kemagnitan dan sebagainya. Setiap batuan reservoir yang ada, mempunyai sifat fisik yang berbeda. Hal ini tergantung dari proses pembentukan batuan tersebut. Adapun sifat-sifat fisik yang ada antara lain porositas, Permeabilitas, saturasi dan tekanan kapiler.
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