Application of geostatistical inversion for thin bed reservoir characterization on Eka field, Central Sumatra Basin, Indonesia

S. A. Helfardi, Abd. Haris, Agus Riyanto, B. Kurniawan

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Application of geostatistical inversion for Bekasap Formation's thin bed reservoir characterization on Eka field has been conducted. Eka field is located in Central Sumatra Basin, the largest Indonesia's tertiary sediment basin that consists of several potential formations producing hydrocarbons. Bekasap Formation is one of which divided into 3 reservoir zones (Bekasap A, B, and C). This paper aims to identify the thin layers of reservoir and to delineate its distribution within Bekasap Formation by performing two seismic inversion methods: Deterministic Inversion (DI) and Geostatistic Inversion (GI). DI is conventional method that uses fixed mathematic formulation and results only one model while GI is a simulation method honoring seismic data, DI result, and well log data. DI result showed the blocky event on sand distribution. The limitation of deterministic inversion in vertical resolution makes it hard to differentiate the thin bed layers of reservoir which assumes the layers as one thick body sand. DI cannot resolve the non-uniqueness matter. The GI results showed the separation of reservoir's blocky layers and identified them into several thin layers which thicknesses are below the tuning thickness. Cross plot analysis showed the Acoustic Impedance (AI) cannot distinguish lithology between sand and shale in Bekasap Formation. However, AI was quite good in separating sand and shale on Bekasap A and Bekasap B. The sand lithology has the value of acoustic impedance ranges from 18213 - 25043 g/cm 3∗ ft/s. The porous sand (reservoir) has additional parameter cut off which is porosity total, ranging from 0.2649 - 0.4136. GI resulted maps give a high definition imaging that can spot the distribution of the thin bed reservoirs which DI cannot. Eventually, the maps were used to determine the next well drilling location.

Original languageEnglish
Title of host publicationProceedings of the 3rd International Symposium on Current Progress in Mathematics and Sciences 2017, ISCPMS 2017
EditorsRatna Yuniati, Terry Mart, Ivandini T. Anggraningrum, Djoko Triyono, Kiki A. Sugeng
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735417410
DOIs
Publication statusPublished - 22 Oct 2018
Event3rd International Symposium on Current Progress in Mathematics and Sciences 2017, ISCPMS 2017 - Bali, Indonesia
Duration: 26 Jul 201727 Jul 2017

Publication series

NameAIP Conference Proceedings
Volume2023
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference3rd International Symposium on Current Progress in Mathematics and Sciences 2017, ISCPMS 2017
Country/TerritoryIndonesia
CityBali
Period26/07/1727/07/17

Fingerprint

Dive into the research topics of 'Application of geostatistical inversion for thin bed reservoir characterization on Eka field, Central Sumatra Basin, Indonesia'. Together they form a unique fingerprint.

Cite this