Bellinda Calista Grace, Agus Guntoro, Hanaga Simabrata

ANALISIS LINGKUNGAN PENGENDAPAN PADA UMUR MIOSEN AKHIR DAERAH LHOKSEUMAWE CEKUNGAN SUMATERA UTARA

Introduction

Analisis lingkungan pengendapan pada umur miosen akhir daerah lhokseumawe cekungan sumatera utara. Teliti lingkungan pengendapan & fasies Miosen Akhir di Lhokseumawe, Cekungan Sumatera Utara. Studi ini gunakan stratigrafi sekuen & elektrofasi untuk petakan sistem delta & laut dangkal.

Abstract

AbstrakPenelitian ini dilakukan untuk menentukan fasies dan lingkungan pengendapan pada umur Miosen Akhir daerah Lhokseumawe Cekungan Sumatera Utara. Secara Admististratif berada pada kabupaten Lhoseumawe dan Sekitarnya, Provinsi Aceh. Studi Analisis mengenai lingkungan pengendapan berdasarkan metode sikuen stratigrafi. Data yang digunakana pada penelitian ini adalah data sumur dan data lapangan. Sikuen Stratigrafi merupakan suatu prediksi dari model stratigrafi. Lingkungan Pengendapan ditentukan dengan menggunakan analisis elektrofasies berdasarkan klasifikasi Kendal (2003). Pemodelan Lingkungan Pengendapan dilakukan dengan mengkorelasikan setiap sumur, kemudian membuat peta net isopach dan peta sand shale ratio, dan mengintegrasikan data sumur, data lapangan, peta net isopach, peta sand shale ratio sehingga didapatkan pemodelan dalam bentuk peta paleogeografi. Terdapat sepuluh fasies pada daerah penelitian terdiri dari. Daerah penelitian berada pada sistem delta dan pada sistem laut dangkal.Kata Kunci : Lingkungan Pengendapan, Cekungan Sumatera Utara, Fasies AbstractThis research was conducted to determine the facies and depositional environtment at the Late Miocene in the Lhokseumawe area in North Sumatera Basin. This location administratively located in Lhokseumawe regency and surrounding, Aceh Province. Study Analysis of the depositional environtment based on stratigraphic sequence method. data used in this analysis are field data and well data. The stratigraphic sequence is a prediction of the stratigraphic model. The depositional environment was determined using electrofacies analysis based on the Kendal Classification (200. Environtmental modeling sedimentation is done by correlating each well, then making a net isopach map, sand shale ratio map, and integrating well data, field data, net isopach map, sand shale ratio map so , that modeling is obtained in the form of paleogeographic maps. There are ten facies in this study area.This research area is in the deltaic system and shallow marine system.Keywords: Depositional Environment, North Sumatera Basin, Facies

Review

The study titled "ANALISIS LINGKUNGAN PENGENDAPAN PADA UMUR MIOSEN AKHIR DAERAH LHOKSEUMAWE CEKUNGAN SUMATERA UTARA" (Analysis of Depositional Environment in the Late Miocene, Lhokseumawe Area, North Sumatra Basin) presents a geological investigation focused on the Late Miocene depositional history of the Lhokseumawe region within the North Sumatra Basin, Aceh Province. The primary objective of this research is to delineate the facies and reconstruct the depositional environments prevalent during this critical geological period. Such studies are fundamental for understanding basin evolution, sedimentary architecture, and are often crucial for hydrocarbon exploration and resource assessment in mature basins like North Sumatra. Methodologically, the authors employed a robust approach integrating both subsurface and surface data. The study utilized well data and field data, which were interpreted within a sequence stratigraphic framework – a standard and effective method for analyzing sedimentary successions. Electrofacies analysis, based on the Kendal (2003) classification, was used to determine depositional environments, suggesting a detailed log interpretation. Further analytical steps included correlating wells, constructing net isopach and sand-shale ratio maps, and integrating all datasets to generate paleogeographic maps. This comprehensive methodology appears well-suited to address the research objectives of characterizing facies and modeling the depositional environment. The abstract highlights key findings, indicating the identification of ten distinct facies within the study area. These facies collectively characterize a depositional setting encompassing both deltaic and shallow marine systems. The integration of various data sources and mapping techniques led to the development of a paleogeographic model, providing insights into the spatial distribution of these environments during the Late Miocene. To strengthen the contribution, future work or a more detailed paper could elaborate on the specific characteristics of these ten facies, discuss the controlling factors behind the deltaic and shallow marine systems (e.g., tectonic influence, sea-level changes), and quantitatively assess the hydrocarbon potential or reservoir quality implications derived from these findings.

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