CAJ | 학술논문

通过镜下观察（岩石、铸体薄片和扫描电镜）与岩心分析，结合地层水分析结果、岩矿组成和物性数据等，以准噶尔盆地克-夏地区下二叠统为例，系统研究了含火山物质油气储层中不同自生矿物成因机理、自生矿物对油气储集空间的影响、孔隙演化及其控制因素，对储集空间具有重要影响的自生矿物主要有绿泥石、沸石（包括方沸石、片沸石和浊沸石）、方解石、钠长石和自生石英。研究表明，酸性水的加入促使早期碱性条件下析出的沸石、钠长石和方解石易于溶蚀；钾长石或斜长石溶蚀后，非等体积矿物转化析出钠长石。早期适量的绿泥石衬边和包膜对储集空间有保护意义，但成岩后期大量的绿泥石胶结破坏孔隙。与基性岩相比，中酸性熔岩和火山碎屑岩未见大规模绿泥石胶结，储层物性较好。NaHCO3型地层水和有机酸影响下的方沸石胶结砂（砾）岩中，次生溶孔发育，为有利的碎屑岩储层。总体上，火山物质的成岩作用及蚀变演化很大程度上改善了中深层油气储层质量。
통과경하관찰（암석、주체박편화소묘전경）여암심분석，결합지층수분석결과、암광조성화물성수거등，이준갈이분지극-하지구하이첩통위례，계통연구료함화산물질유기저층중불동자생광물성인궤리、자생광물대유기저집공간적영향、공극연화급기공제인소，대저집공간구유중요영향적자생광물주요유록니석、비석（포괄방비석、편비석화탁비석）、방해석、납장석화자생석영。연구표명，산성수적가입촉사조기감성조건하석출적비석、납장석화방해석역우용식；갑장석혹사장석용식후，비등체적광물전화석출납장석。조기괄량적록니석츤변화포막대저집공간유보호의의，단성암후기대량적록니석효결파배공극。여기성암상비，중산성용암화화산쇄설암미견대규모록니석효결，저층물성교호。NaHCO3형지층수화유궤산영향하적방비석효결사（력）암중，차생용공발육，위유리적쇄설암저층。총체상，화산물질적성암작용급식변연화흔대정도상개선료중심층유기저층질량。
This study investigated the genesis of different authigenic minerals in hydrocarbon reservoirs associated with alteration of vol-canic materials and their influences on reservoir space,as well as the pore evolution and its control factors.A case study was carried outon the Lower Permian strata in Ke-Xia region,Junggar Basin by light and scanning electron microscopic examinations of rock samplesand thin-sections and core analysis,combined with the results of formation water analysis as well as rock composition and lithological da-ta.Authigenic minerals that exerted great influences on reservoir space mainly included chlorite,zeolites (including analcime,heuland-ite,and laumontite),calcite,albite,and quartz.The addition of acidic water promoted the dissolution of zeolite,albite,and calcite thatwere precipitated under alkaline conditions in an early stage;after the dissolution of potash feldspar or anorthose,the non-isopyknic min-erals were transformed through albitization.Proper chlorite rims in pores and grain coatings preserved reservoir pore space in an earlystage;however,the presence of massive chlorite cements reduced the reservoir quality in a late stage of diagenesis.Compared with basicvolcanic rocks,neutral-silicic lavas and pyroclastic rocks contain less authigenic chlorite and thus may have improved reservoir property.As influenced by NaHCO3-type formation water and organic acid,coarse glutenite bearing soluble analcime cements has well-developedsecondary pores and serves as the favorable clastic reservoir.Overall,the diagenesis and diagenetic evolution of volcanic materials significantly have improved the quality of hydrocarbon reservoirs at middle-to-deep depths.