Interlayer Features and Petroleum Geology Meaning ofDonghe Sandstones in the Hadson Oilfield
Received date: 2014-01-07
Revised date: 2014-05-08
Online published: 2014-06-10
The Hadson Oilfield,whose main reservoir is Carboniferous Donghe sandstones,has the problems of strong heterogeneity in reservoir fluid properties and complex oil-water relationships.Aimed to interpret the differences between interlayers and their around normal reservoirs in Donghe sandstones,through detailed core samples observation and analysis of well testing data,this article analyzed the geometry of interlayers,their petrologic elements and diagenesis,and pointed out their influences on fluid flow and materials interchange.This study indicates that elements of rock skeleton in calcareous interlayers and their around reservoirs are basically unanimous.However,because of the differences in diagenesis process,the cements in interlayers are usually calcite,dolomite and anhydrite.The cements can make the physical property of calcareous interlayers very poor,and they can also make significant property differences in crude oil and formation water which located above and below the interlayers.Based on the above analysis,the barrier effects on fluid flow of the interlayers of different degree lead to the properties of uneven distribution of fluid and complex fluid flow in the Donghe sandstone in the Hadson Oilfield.
Key words: Donghe sandstones; Interlayers; Agglutination; Low permeability; Heterogeneity
ZHAO Hong,LUO Xiao-rong,XIAO Zhong-yao,ZHANG Bao-shou,ZHAO Feng-yun,LEI Yu-hong,ZHAO Jian,HU Cai-zhi . Interlayer Features and Petroleum Geology Meaning ofDonghe Sandstones in the Hadson Oilfield[J]. Natural Gas Geoscience, 2014 , 25(6) : 824 -833 . DOI: 10.11764/j.issn.1672-1926.2014.06.824
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