eprintid: 8642
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/86/42
datestamp: 2023-11-09 16:20:33
lastmod: 2023-11-09 16:20:33
status_changed: 2023-11-09 16:13:09
type: article
metadata_visibility: show
creators_name: Siddiqui, N.A.
creators_name: Rahman, A.H.A.
creators_name: Sum, C.W.
creators_name: Mathew, M.J.
creators_name: Hassaan, M.
creators_name: Menier, D.
title: Generic hierarchy of sandstone facies quality and static connectivity: an example from the Middle-Late Miocene Miri Formation, Sarawak Basin, Borneo
ispublished: pub
keywords: connectivity; facies; hydrocarbon reserve; marine sediment; Miocene; mud; outcrop; porosity; sandstone; sedimentology; shallow water; trough, Borneo; East Malaysia; Malaysia; Miri; Sarawak
note: cited By 12
abstract: A significant percentage of the world�s hydrocarbon reserves are found in shallow marine sandstone rocks. Understanding reservoir connectivity and quality of shallow-marine sandstones from outcrop analysis and facies characteristics is a challenging task. Here, we analyze well-exposed outcrops of the Miri Formation, Sarawak Basin, Borneo, to characterize reservoir properties (grain-size, petrography, pore-perm, and static connectivity) of different sandstone facies and to construct a 2D intermediate-scale model of sandstone distribution and connectivity. The outcrops, with lateral extent of �200�500 m, consist of mostly sandstone with mud-rich deposits including some isolated sand bodies. Field description in terms of facies distribution and dimensions of sand bodies and rock sampling for grain-size (Folk and Ward methods), petrographic (point count method for porosity, sorting, grain-size, and sand-mud ), and poro-perm (for porosity and permeability) analyses were performed to quantify and examine seven different types of sandstones facies, i.e., (i) hummocky cross-stratified sandstones (HCSS, �0.5�4 m thick), (ii) herringbone cross-bedded (HBCBS, �0.5�3 m thick), (iii) trough cross-bedded sandstones (TCBS, �0.5�2 m thick), (iv) wavy- to flaser-bedded (W-FBS, �1�3 m thick), (v) cross-bedded sandstone (CS), �0.5�3 m thick), (vi) bioturbated sandstone (BS, �1�5 m thick), and (vii) massive sandstone (MS, �0.5�2 m thick). Our results show that compared to other sandstone facies, sandstones of HCSS and HBCBS are better sorted, have minimal mud content, and display increasing vertical and lateral connectivity due to depositional patterns even in bioturbated rich sand. Sandstones of BS and CB are of poor quality in terms of grain sorting and poro-perm, while TCB and MS sandstone facies are of less lateral and vertical extent. On the basis of these results, a 2-D outcrop-based model is constructed that provide additional insights into the significance of small-scale heterogeneity and static connectivity of shallow marine sandstone deposits which can be an analogue for subsurface reservoir quality analysis. © 2017, Saudi Society for Geosciences.
date: 2017
publisher: Springer Verlag
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85019981544&doi=10.1007%2fs12517-017-3013-1&partnerID=40&md5=cfba9c7063302b4d7f5eb4c0bf7e76ca
id_number: 10.1007/s12517-017-3013-1
full_text_status: none
publication: Arabian Journal of Geosciences
volume: 10
number: 11
refereed: TRUE
issn: 18667511
citation:   Siddiqui, N.A. and Rahman, A.H.A. and Sum, C.W. and Mathew, M.J. and Hassaan, M. and Menier, D.  (2017) Generic hierarchy of sandstone facies quality and static connectivity: an example from the Middle-Late Miocene Miri Formation, Sarawak Basin, Borneo.  Arabian Journal of Geosciences, 10 (11).   ISSN 18667511