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primary topic: Generic hierarchy of sandstone facies quality and static connectivity: an example from the Middle-Late Miocene Miri Formation, Sarawak Basin, Borneo

Generic hierarchy of sandstone facies quality and static connectivity: an example from the Middle-Late Miocene Miri Formation, Sarawak Basin, Borneo
type: AcademicArticle
type: Article
abstract: A significant percentage of the worldâ��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 â�¼200â��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, â�¼0.5â��4 m thick), (ii) herringbone cross-bedded (HBCBS, â�¼0.5â��3 m thick), (iii) trough cross-bedded sandstones (TCBS, â�¼0.5â��2 m thick), (iv) wavy- to flaser-bedded (W-FBS, â�¼1â��3 m thick), (v) cross-bedded sandstone (CS), â�¼0.5â��3 m thick), (vi) bioturbated sandstone (BS, â�¼1â��5 m thick), and (vii) massive sandstone (MS, â�¼0.5â��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 i…
date: 2017
volume: 10
issue: 11
is part of: Arabian Journal of Geosciences
status: peerReviewed
status: published
author list: authors
type: EPrint
type: ArticleEPrint
is part of: repository

Springer Verlag
type: Organization

Arabian Journal of Geosciences
type: Collection
issn: 18667511

M. Hassaan
type: Person
given name: M.
family name: Hassaan

D. Menier
type: Person
given name: D.
family name: Menier

M.J. Mathew
type: Person
given name: M.J.
family name: Mathew

A.H.A. Rahman
type: Person
given name: A.H.A.
family name: Rahman

C.W. Sum
type: Person
given name: C.W.
family name: Sum

N.A. Siddiqui
type: Person
given name: N.A.
family name: Siddiqui

HTML Summary of #8642 Generic hierarchy of sandstone facies quality and static connectivity: an example from the Middle-Late Miocene Miri Formation, Sarawak Basin, Borneo
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primary topic: Generic hierarchy of sandstone facies quality and static connectivity: an example from the Middle-Late Miocene Miri Formation, Sarawak Basin, Borneo