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All Journal Bulletin of Scientific Contribution : Geology Jurnal Geosains dan Remote Sensing (JGRS)
Harfiandri, Muhammad Said
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science Physics

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BIOSTRATIGRAFI FORMASI TELISA BERDASARKAN PERSEBARAN FORAMINIFERA DI DAERAH MUAROPAITI, KECAMATAN KAPUR IX, KABUPATEN LIMA PULUH KOTA, SUMATERA BARAT Harfiandri, Muhammad Said; Rochmana, Yogie Zulkurnia
Bulletin of Scientific Contribution Vol 22, No 2 (2024): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v22i2.56104

Abstract

Pendekatan analisis paleontologi dapat digunakan dalam menentukan umur relatif suatu batuan dengan melihat distribusi dan acuan umur fosil foraminifera yang terdapat pada batuan. Oleh karena itu, metode ini digunakan sebagai acuan dalam penelitian biostratigrafi yang membahas mengenai penentuan umur batuan dengan menggunakan fosil yang terkandung di dalamnya. Penelitian ini dilakukan di Desa Muaropaiti, Sumatera Barat yang secara regional terletak pada Cekungan Sumatera Tengah. Observasi lapangan telah dilakukan dalam rangka perekaman data geologi permukaan serta data paleontologi berupa foraminifera yang di dapatkan dari hasil preparasi sampel batuan. Tujuan penelitian ini dilakukan untuk menentukan umur relatif dan lingkungan batimetri pada Formasi Telisa melalui analisis biostratigrafi. Metode yang digunakan berupa analisis biostratigrafi dengan melihat umur dan batimetri pada fosil foraminifera planktonik dan bentonik serta analisis struktur sedimen yang terdapat pada daerah telitian. Studi ini mengungkapkan bahwa umur relatif pada Formasi Telisa berdasarkan analisis foraminifera planktonik adalah Middle Miocene (N8-N10). Lingkungan batimetri berdasarkan foraminifera bentonik didapatkan pada area Transisi-Neritik Tepi (15m – 90m). Hal ini menunjukan bahwa Formasi Telisa terendapkan pada kala Miosen Tengah dimana terjadinya transgresi (kenaikan muka air laut) yang mengendapkan litologi batuan sedimen dengan ukuran butir halus seperti batulempung, batuserpih, dan batulanau yang bersifat karbonatan.
Facies and Sequence Stratigraphy Analysis of Carbonate Formation in “ANDRI” Field, Offshore Indonesian Basin: Impacts on Reservoir and Hydrocarbon Quality Harfiandri, Muhammad Said; Setiawan, Budhi; Rochmana, Yogie Zulkurnia; Arieffiandhany, Riezal
Jurnal Geosains dan Remote Sensing Vol 6 No 2 (2025): JGRS Edisi November
Publisher : Department of Geophysical Engineering, Faculty of Engineering, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jgrs.ft.unila.481

Abstract

The Baturaja Formation in the northern West Java Basin is the focus of many oil and gas exploration and production activities, mainly due to its significant reservoir potential. The formation consists of Early Miocene-aged carbonate sedimentary layers with good hydrocarbon reservoir characteristics, distribution, and quality. This study aims to identify the reservoir characteristics and hydrocarbon prospective zones of carbonate formation through integrated facies analysis, sequence stratigraphy, diagenetic processes, and petrophysical evaluation. This research uses qualitative and quantitative methods, where the qualitative stage starts with lithological interpretation from core data and thin sections of rock. Furthermore, quantitative analysis is carried out to calculate reservoir properties based on petrophysical analysis such as shale volume, porosity, permeability, and water saturation. The results show that the shoal reef facies exhibit higher hydrocarbon potential than the lagoonal facies, with greater maximum hydrocarbon thickness and more consistent hydrocarbon distribution. This follow the characteristics of the shoal reef facies, which have grain supported characteristics with low clay matrix content, a high degree of pore connectivity and high permeability Diagenetic process also plays an important role in the formation of porosity and permeability, where the shoal reef facies with fossiliferous packstone lithofacies exhibit good porosity and permeability, such as intercrystalline, intraparticle, and fracture porosity.This is due to the depositional process of the facies in a high-energy environment with abundant carbonate production growth rate.
Co-Authors Arieffiandhany, Riezal Budhi Setiawan Yogie Zulkurnia Rochmana