Tight oil sandstones in Upper Triassic Yanchang Formation, Ordos Basin, N. China: Reservoir quality destruction in a closed diagenetic system

An investigation of the Triassic Yanchang Formation, Ordos Basin, N. China, revealed that the diagenesis and quality of tight oil sandstone reservoirs (with an average porosity of 9.83% and an average permeability of 0.96 mD) were controlled by a closed diagenetic system. The carbonate cements obser...

Full description

Saved in:
Bibliographic Details
Published in:Geological journal (Chichester, England) England), 2019-11, Vol.54 (6), p.3239-3256
Main Authors: Liu, Mingjie, Gluyas, Jon, Wang, Weibin, Liu, Zhen, Liu, Junbang, Tan, Xiucheng, Zeng, Wei, Somerville, I. D., Xiong, Yi
Format: Article
Language:English
Subjects:
Carbonates
Cations
Cements
Clay
Clay minerals
closed diagenetic geochemical system
Decarboxylation
Diagenesis
Dissolution
Dissolving
Feldspars
Mudstone
Oil
Oil exploration
Ordos Basin
Organic matter
Permeability
Pores
Porosity
reservoir quality
Reservoirs
Sandstone
Sedimentary rocks
tight oil sandstone
Triassic
Yanchang Formation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An investigation of the Triassic Yanchang Formation, Ordos Basin, N. China, revealed that the diagenesis and quality of tight oil sandstone reservoirs (with an average porosity of 9.83% and an average permeability of 0.96 mD) were controlled by a closed diagenetic system. The carbonate cements observed in the sandstone were derived from decarboxylation of organic matter that occurred in the adjacent mudstones. These reactions supplied CO32−, which reacted with cations derived from grain dissolution in the sandstones. The average size of the diagenetic geochemical system with respect to carbonate cements was small (
ISSN:0072-1050
1099-1034
DOI:10.1002/gj.3319