Karakterisasi reservoir sandstone menggunakan metode inversi acoustic impedance dan analisis petrofisika studi kasus lapangan "Deju" Formasi Talang Akar, Sub-Cekungan Ciputat, Jawa Barat Utara = Characterization of sandstone reservoir using inversion acoustic impedance and petrophysical analysis case study of "Deju" Field in Talang Akar Formation, Ciputat Sub-Basin, North West Java