relation: https://khub.utp.edu.my/scholars/10598/
title: IMPACT OF SMALL - SCALE HETEROGENEITY ON POTENTIAL RECOVERY IN SELECTED RESERVOIR SANDSTONES FROM WEST BARAM DELTA, OFFSHORE, SARAWAK
creator: Yusuf, I.
creator: Padmanabhan, E.
description: Small - scale sedimentary heterogeneity in reservoir description is required for reliable recovery. West Baram Delta was selected as a case study because of the ongoing residual oil phase recovery in the area. This paper investigates effects of different small - scale sedimentary structures on permeability variation of selected reservoir sandstones using an integrated approach combining cores, thin sections, mercury injection capillary pressure data and tiny spot air permeameter. Two main sandstone lithofacies; namely massive fine grained and massive coarse grained sandstone lithofacies were identified to exhibit small-scale heterogeneity. The result indicates in massive fine grained sandstones characterized by fining-up grains with fossil shell fragments, Ophiomorpha burrows and faint lamination structures measured air permeability values along host sample accounted for 50 of varying air permeability from 79 mD to 648 mD and attributed to poor interconnectivity of pores resulting from grain packing and volume matrix content, as along coarse - fine boundary permeability varies between 249 mD to 1124 mD accounted for 50 permeability ascribed to variation in grain sorting and embedded shell fragments. Also along Ophiomorpha burrows, air permeability vary from 298 mD to 794 mD accounted for 45 permeability, but along host sediment permeability varies from 75 mD to 368 mD accounted for 55 increase. The measured permeability along lamina structure, values vary between 123 mD to 738 mD accounting for 55.6 also ascribed to grains topology that facilitates pore interconnectivity. But however, along host sediment air permeability varies from 89 mD to 448 mD accounted for 44.4 increase. In massive coarse grained sandstones characterized by faint lamination and biotubation, air permeability vary from 533 mD to 819 mD along lamina accounted for 60 and varies from 828 mD to 1188 mD along host sample, along biotubated spots permeability vary from 78 mD to 93 mD and is attributed to decrease in grain isotropy and sorting within region. It shows that the massive fine grained sandstones hold higher fluid flow potential advantage over massive coarse grained sandstone lithofacies in the delta. Furthermore, prior knowledge of small-scale sedimentary structure will give insight on potential recovery variations within different reservoir sandstone lithofacies as they either enhance or reduce permeability © 2018. All Rights Reserved.
publisher: Slovnaft VURUP a.s
date: 2018
type: Article
type: PeerReviewed
identifier:   Yusuf, I. and Padmanabhan, E.  (2018) IMPACT OF SMALL - SCALE HETEROGENEITY ON POTENTIAL RECOVERY IN SELECTED RESERVOIR SANDSTONES FROM WEST BARAM DELTA, OFFSHORE, SARAWAK.  Petroleum and Coal, 60 (3).  pp. 496-507.  ISSN 13377027     
relation: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85114789581&partnerID=40&md5=2dfb91690a1061c86dc923e997e5d629