KARAKTERISTIK GEOKIMIA BATUAN INDUK FORMASI WALAT, KABUPATEN SUKABUMI, PROVINSI JAWA BARAT

Nisa Nurul Ilmi, Aldrin Ramadian

Abstract


Kajian karakteristik geokimia batuan induk Formasi Walat di Sukabumi, Jawa Barat merupakan suatu langkah untuk mendapatkan informasi mengenai sistem minyak dan gas bumi yang ada. Lebih lanjut lagi, kajian ini juga diharapkan dapat mengungkap kesamaan sistem minyak dan gas bumi di daerah studi, dengan potensi hidrokarbon terbukti di Cekungan Jawabarat Utara. Kekayaan material organik, tingkat kematangan, serta tipe hidrokarbon yang dihasilkan merupakan parameter penting yang menunjukkan karakter batuan induk secara geokimia. Sistematika pemercontohan singkapan Formasi Walat yang diyakini berpotensi sebagai batuan induk, dianalisis ke laboratorium untuk penyelidikan karakteristik geokimia. Sebanyak tujuh belas percontoh terpilih, dan selanjutnya dianalisis karakter geokimianya melalui parameter Total Organic Carbon dan Rock Eval Pyrolysis (nilai S1, S2, dan S3 beserta turunannya).

 

Berdasarkan tingkat kematangan, semua percontoh berada pada tingkatan matang hingga matang akhir dengan kualitas kerogen tipe III yang menghasilkan gas. Hasil penelitian menunjukkan bahwa Formasi Walat memiliki karakter batuan induk dengan kekayaan sedang hingga sangat baik, dan memiliki potensi untuk menghasilkan hidrokarbon jenis gas. Berdasarkan penemuan sumber batuan induk potensial di formasi ini, maka dapat dikatakan bahwa di daerah studi terdapat sistem minyak dan gas bumi yang setara dengan Cekungan Jawabarat Utara, sehingga eksplorasi migas pada wilayah selatan Jawa Barat menjadi menarik.


Keywords


batuan induk; geokimia; hidrokarbon; Formasi Walat; Cekungan Jawabarat Selatan

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