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Characteristics and favorable controlling factors of karst reservoirs within the uppermost part of Ordovician in western Shandong-eastern Henan area
Author(s): 
Pages: 545-559
Year: Issue:  4
Journal: Journal of Palaeogeography

Keyword:  western Shandong-eastern Henan (Dongpu)areaOrdoviciankarst reservoircon-trolling factorreservoir favorable zone;
Abstract: Based on observation of outcrops,cores and thin sections and analysis of logging data, combined with regional geological background,features,evolution,main controlling factors of the reser-voir within the Fengfeng Formation and Majiagou Formation,the uppermost part of Ordovician in the west-ern Shandong-eastern Henan (Dongpu)area were studied deeply.Subsequently,the distribution of fa-vorable reservoirs was predicted.The study results revealed that grain limestone,dolomitic limestone,mi-crite limestone,silty-fine crystalline dolostone,gypsum-bearing dolostone and algae dolostone were the dominant rock types,and the main reservoir spaces were cracks and pores.The average porosity of dolo-mite reservoirs was 2.5%,and the average permeability was 7.43×1 0 -3μm 2 .The average porosity of lime-stone reservoir was 2.2%,and the average permeability was 2.72 ×1 0 -3 μm 2 .The reservoirs had experi-enced four evolution stages,which are the period of penecontemporaneous pore formation (Cambrian-Mid-dle Ordovician),weathering leaching period (Late Ordovician-Early Carboniferous),minerals filling pe-riod (Late Carboniferous -Late Cretaceous) and the period of pore dissolution reconstruction (Paleo-gene).Sedimentary facies,diagenesis and tectonic stress play a significant role in controlling the formation of favorable reservoirs.The study indicates that areas superimposed by the grain bank,tidal flat facies zone,fault belt,dolomitization area,penecontemporaneous karstification area,epigenic karstification ar-ea and buried karstification area are predicted as the most favorable reservoir zone.Areas superimposed by the grain bank,tidal flat facies zone,dolomitization area,penecontemporaneous karstification area,epi-genic karstification area and areas superimposed by the fault belt,epigenic karstification area,buried karstification area are predicted as the secondary favorable reservoir zones.Areas superimposed by the grain bank,tidal flat facies zone,fault belt,dolomitization area,penecontemporaneous karstification area and buried karstification area are predicted as the general reservoir zone.
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