Hamriani Ryka, Putri Nur Aprilya, Putri Nur Aprilya, Efrina Candra Agusti, Jamaluddin ., Desianto Payung Battu

INTEGRASI ANALISIS ELEKTROFASIES DAN SEKUEN STRATIGRAFI DALAM PENENTUAN KUALITAS RESERVOIR LAPANGAN PTR, CEKUNGAN KUTAI, KALIMANTAN TIMUR

Introduction

Integrasi analisis elektrofasies dan sekuen stratigrafi dalam penentuan kualitas reservoir lapangan ptr, cekungan kutai, kalimantan timur. Integrasi elektrofasies dan sekuen stratigrafi untuk kualitas reservoir Lapangan PTR, Cekungan Kutai. Mengidentifikasi pola, lingkungan pengendapan, dan sikuen. Sand channel target utama hidrokarbon.

Abstract

Penelitian ini memfokuskan pada integrasi analisis elektrofasies dan sekuen stratigrafi untuk menentukan kualitas reservoir di Lapangan PTR, Cekungan Kutai, Kalimantan Timur. Penelitian ini dilakukan terhadap 3 sumur yaitu P-1, P-2, dan P-3 melalui pendekatan kualitatif dan kuantitatif yang mengintegrasikan data wireline log dan data cutting. Berdasarkan analisis elektrofasies teridentifikasi tiga pola utama elektrofasies yaitu (1) cylindrical/blocky yang menunjukkan asosiasi fasies distributary channel; (2) pola funnel menunjukkan asosiasi fasies crevasse splay dan mouth bar; dan (3) pola bell menunjukkan asosiasi fasies levee dan tidal channel. Pola-pola tersebut menunjukkan bahwa lingkungan pengendapan di lokasi penelitian berupa Lower Delta Plain – Delta Front dengan pengaruh fluvio-deltaik dan pasang surut. Analisis sekuen stratigrafi mengindikasikan keberadaan empat sikuen pengendapan utama (Sikuen 1 hingga Sikuen 4) yang dibatasi oleh lima zona ketidakselarasan (Z1–Z5), serta terdiri atas beberapa unit sistem pengendapan, yaitu Lowstand System Tract (LST), Transgressive System Tract (TST), dan Highstand System Tract (HST). Reservoir utama diidentifikasi sebagai sand channel dengan rata-rata porositas efektif sebesar 0,182 v/v dan permeabilitas 26,467 mD (kategori baik), serta sand bar dengan porositas efektif 0,177 v/v dan permeabilitas 9,645 mD (kategori cukup). Dengan demikian, reservoir sand channel diidentifikasi sebagai target utama pengembangan hidrokarbon karena memiliki karakteristik penyimpanan dan kemampuan alir yang lebih baik dibandingkan sand bar.

Review

This paper, titled 'INTEGRASI ANALISIS ELEKTROFASIES DAN SEKUEN STRATIGRAFI DALAM PENENTUAN KUALITAS RESERVOIR LAPANGAN PTR, CEKUNGAN KUTAI, KALIMANTAN TIMUR,' presents a focused study on understanding reservoir quality in the PTR Field, Kutai Basin, East Kalimantan. The research employs a robust integrated approach, combining electrofacies analysis with sequence stratigraphy, to characterize the subsurface geology and evaluate hydrocarbon potential. Utilizing data from three wells (P-1, P-2, and P-3), the authors meticulously integrate wireline logs and cutting data through both qualitative and quantitative methods to achieve a comprehensive assessment of reservoir characteristics. The findings from the electrofacies analysis are particularly insightful, identifying three distinct log patterns: cylindrical/blocky, indicative of distributary channels; funnel-shaped, suggesting crevasse splay and mouth bar deposits; and bell-shaped, characteristic of levee and tidal channel environments. These patterns collectively point to a depositional setting of a Lower Delta Plain – Delta Front, strongly influenced by both fluvio-deltaic and tidal processes. Complementing this, the sequence stratigraphic interpretation reveals four principal depositional sequences (Sikuen 1-4), bounded by five unconformity zones (Z1-Z5), and comprising the expected system tracts: Lowstand System Tract (LST), Transgressive System Tract (TST), and Highstand System Tract (HST). Crucially, the study identifies the main reservoirs as sand channels and sand bars. Sand channels demonstrate superior quality, with an average effective porosity of 0.182 v/v and permeability of 26.467 mD (categorized as good), while sand bars show slightly lower quality with 0.177 v/v porosity and 9.645 mD permeability (categorized as sufficient). The integrated analysis culminates in a clear differentiation of reservoir quality, unequivocally identifying sand channels as the primary targets for future hydrocarbon development in the PTR Field. Their significantly better storage capacity and flow characteristics, compared to sand bars, provide valuable guidance for field development strategies. This research exemplifies the power of combining multiple subsurface characterization techniques to build a detailed geological model, offering practical and impactful insights for optimizing exploration and production efforts in complex deltaic systems within the Kutai Basin and potentially analogous settings.

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