Studi Lingkungan Pengendapan dan Diagenesis Batuan Berdasarkan Analisis Petrografi di Daerah Sukolilo, Pati, Jawa-Tengah
DOI:
https://doi.org/10.37525/mz/2019-1/182Keywords:
Fm Ngrayong, Fm Bulu, Petrografi, Lingkungan Pengendapan, DiagnesisAbstract
Batupasir Formasi Ngrayong merupakan reservoir penting di cekungan migas jawa bagian timur-utara sedangkan Formasi Bulu umumnya memiliki fungsi sebagai akuifer di daerah penelitian. Kualitas akuifer dan reservoir berupa porositas dan permeabilitas dapat dipengaruhi oleh proses diagenesis. Penelitian ini bertujuan untuk menentukan lingkungan pengendapan dan proses diagenesis yang terjadi pada batuan di Formasi Ngrayong dan Formasi Bulu. Batupasir sebagaimana batuan sedimen pada umumnya mengalami proses diagenesis berupa kompaksi, sementasi, dan pelarutan, sedangkan batuan karbonat proses diagenesisnya sangat bervariasi tetapi yang terpenting adalah proses pelarutan dan rekahan sebagai pembentuk porositas. Dari hasil analisis petrografi dapat diketahui bahwa lingkungan pengendapan Formasi Ngrayong adalah neritik tengah-neritik dalam sedangkan Formasi Bulu diendapkan di lingkungan inner shelf. Proses diagenesis yang terjadi berupa kompaksi, sementasi, pelarutan dan mikritisasi.
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