DOI: 10.1306/12021313040
Scopus记录号: 2-s2.0-84903582686
论文题名: Diagenesis and porosity development in the First Eocene reservoir at the giant Wafra Field, Partitioned Zone, Saudi Arabia and Kuwait
作者: Sailer A.H. ; Pollitt D. ; Dickson J.A.D.
刊名: AAPG Bulletin
ISSN: 0149-1536
EISSN: 1558-9266
出版年: 2014
发表日期: 2014
卷: 98, 期: 6 起始页码: 1185
结束页码: 1212
语种: 英语
Scopus关键词: Biodegradation
; Calcite
; Cements
; Crude oil
; Dissolution
; Heavy oil production
; Isotopes
; Porosity
; Sedimentology
; Sulfur compounds
; Bacterial sulfate reduction
; Isotopic characteristics
; Oil biodegradation
; Oxygen isotopic composition
; Porosity development
; Primary production
; Reservoir characteristic
; Sulfur precipitation
; Petroleum reservoir engineering
; belemnite
; diagenesis
; dissolution
; dolomitization
; emplacement
; Eocene
; facies
; heavy oil
; organic carbon
; permeability
; porosity
; primary production
; seawater
; Kuwait [Kuwait (NTN)]
; Kuwait [Middle East]
; Saudi Arabia
; Bacteria (microorganisms)
; Belemnoidea
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: The First Eocene reservoir at the Wafra Field produces heavy oil from very porous dolomites at depths of ∼1000 to 1300 ft (300 to 400 m) in the Paleocene-Eocene Umm Er Radhuma Formation. Porosity is commonly 30-50%, permeability is commonly 100-2000 md, and those reservoir characteristics were determined largely by diagenesis. Early diagenesis is dominated by dolomitization, dissolution associated with dolomitization, and precipitation of sulfates. Petrographic and stable isotopic characteristics support dolomitization and sulfate precipitation in evaporated (refluxing) seawater during shallow burial. The highest permeabilities occur in subtidal facies. Low-permeability tidal-flat facies stratify the reservoir. Heavy oil preferentially filled high-permeability dolomites; whereas, low-permeability tidal-flat facies are commonly filled with water because their pore throats are too small to allow migration of viscous oil into the rock. This reservoir's very high porosity is probably related to its shallow burial and early oil emplacement. Late-stage diagenesis is dominated by bacterial sulfate reduction (BSR) that caused dissolution of sulfate nodules, calcite cementation, sulfur precipitation, and oil biodegradation. The BSR is indicated by very low δ13C compositions of calcite cements (-17.1 to -34.9‰, Peedee Belemnite standard), which require an organic carbon source; probably oil. The oxygen isotopic compositions of the calcites support precipitation from formation waters similar to those in the reservoir now. The BSR probably started during initial oil emplacement and continues to the present. The BSR was heterogeneous resulting in produced oils with gravities of 14-21° API. Even heavier oils are present that could not flow during primary production. Primary production was likely greatest in areas and intervals with lighter, less viscous oil. Copyright © 2014. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84903582686&doi=10.1306%2f12021313040&partnerID=40&md5=b07ad4cfa04bb919a6907c384b4b8e7c
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13107
Appears in Collections: 过去全球变化的重建 影响、适应和脆弱性 科学计划与规划 气候变化与战略 全球变化的国际研究计划 气候减缓与适应 气候变化事实与影响
There are no files associated with this item.
Recommended Citation:
Sailer A.H.,Pollitt D.,Dickson J.A.D.. Diagenesis and porosity development in the First Eocene reservoir at the giant Wafra Field, Partitioned Zone, Saudi Arabia and Kuwait[J]. AAPG Bulletin,2014-01-01,98(6)