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Contribution of sedimentary and diagenetic factors to clastic reservoir quality:Quantitative determination by single factor comparison method
Pages: 535-544
Year: Issue:  4
Journal: Journal of Palaeogeography

Keyword:  reservoir qualitycontrolling factorssingle factor comparison methodPaleogeneDongying FormationBozhong sag;
Abstract: Quality of clastic reservoirs refers to permeability and porosity.Factors controlling reservoir quality are mainly sedimentary and diagenetic.Sedimentary factors include grain size,rounding,sorting and content of clay matrix.Diagenetic factors include compaction degree,content of dissolution pores, type and content of cements.The reservoir quality of a sandstone is commonly controlled by many factors, and the key to determine major controlling factors is to find out quantitative contribution of each factor.In this paper,a method to analyze quantitative contribution of sedimentary and diagenetic factors to reservoir quality—the single factor comparison method—is proposed out,and is applied to the sandstone reservoirs in the Dongying Formation of Paleogene in the Bozhong sag.There are two types of sandstones in the Dongying Formation,distributary channel sandstone and mouth bar sandstone of deltaic facies,and their permeability differs greatly.Quantitative contribution rate of each factor to the reservoir quality difference is calculated,and major controlling factor is determined:Contribution rate of clay matrix content is 78.5%, indicating clay matrix content is the major controlling factor;that of grain size is 2.7%,that of sorting co-efficient is 1 .5%;that of authigenic clay mineral content is 1 5.9%,that of carbonate cement content is 2.3%,that of dissolution pore content is 1 .5%,that of compaction degree is 1 .7%.Comprehensive con-tribution rate of sedimentary factors is the sum of each sedimentary factor's contribution rate,i.e.,82.7%;comprehensive contribution rate of diagenetic factors is the sum of each diagenetic factor's contribution rate,i.e.,1 8.4% (the rate of dissolution pore is -1 .5% because of its reverse influence).Thus,sedi-mentary factors are major factors resulting in great difference in permeability between channel sandstone and mouth bar sandstone in this area.
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