济阳坳陷桩西地区中生界火山岩成岩演化特征及有利储层分布

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中图分类号：TE122.2 文献标志码：A

Abstract：Thediagenetic processes of volcanicrocks difer markedlyfromthoseof clasticrocks.The Mesozoic volcanic rocks inthe Zhanxi areaunderwentmulti-phasediageneticevolutioninvolving tectonic，magmatic，and hydrothermal interactions. Basedonstructuralanalysis，hydrothermalfllingcharacteristics，anddiageneticmineralidentification，thediageneticsequence of these volcanicrocks was reconstructed.During the Yanshanian NW-trending compresion along the TanshuFault Zone，intense volcanic eruptions formedacomplex dominated bydense blocky basalt and porphyriticandesite.Follwig solidification，thevolcanicrocks experiencedtwo stagesof hydrothermalactivityandoestageof hydrocarbon-induceddisolutionand filing.Thereservoirpropertiesoftheselithologiesvarysignificantlydueto theircontrastingdiageneticpathways. Andesiteunderentasequenceofzeolitefillng-caleiteprecipitation-chloritization-ferocalcitereplacement；basaltexperiencedchloritization-silieous filing-ferrodolomiteprecipitation；andvolcanicbreccia followedclasticaccumulation-chlorite lining-ferrodolomitecementation.Scoria porosityandpermeabilitydecreasedmarkedlyduetocementatio，whereasbasaltretainedrelativelyhighpermeabilitydespiteprimaryporosityloss，andandesiteexibitedminimalreservoiralteration.Nearthe ZhananFault，thebasalt fracture systemservesasamigrationpathwayforhydrocarbons，whiledissolutioncavitiesinandesite provide storage space.Scoria'spoor reservoir qualityresults from hydrothermal cementation，whereas thecompositezoneof basaltic fractures and andesitic alteration forms a favorable hydrocarbon enrichment area.

Keywords：volcanic rocks；diagenetic evolution； favorable reservoirs；Mesozoic； Jiyang Depresion； Zhuangxi area

近八I 世纪以不，隐有市，仙喊的逊彻怕竭，能源接替的压力越来越大，火山岩油气作为非常规油气的重要组成部分地位逐渐凸显。（剩余19799字）