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1、學(xué)兔兔www.xuetutu.com天然乞此第32卷第2期0IL&GASGEOLOGY2011年4月文章編號(hào):0253—9985(2011)02—0182—10鄂爾多斯盆地子長(zhǎng)地區(qū)延長(zhǎng)組流體包裹體特征與油氣成藏期次梁宇,任戰(zhàn)利,王彥龍,史政(1.西北大學(xué)大陸動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室,陜西西安710069;2.延長(zhǎng)油田股份有限公司子長(zhǎng)采油廠,陜西延安716000)摘要:鄂爾多斯盆地子長(zhǎng)地區(qū)延長(zhǎng)組砂巖儲(chǔ)層主要成巖作用有壓實(shí)作用、膠結(jié)作用、溶蝕作用和裂隙作用等,成巖自生礦物以綠泥石、自生石英、方解石為主。根據(jù)油氣包裹體寄主成巖礦物的形成時(shí)間序列,識(shí)別出兩期油氣包裹體。第一
2、期油氣包裹體主要分布在石英和長(zhǎng)石等礦物溶蝕孔隙、早期裂隙中,被石英和長(zhǎng)石后期次生加大邊包裹起來(lái)。第二期油氣包裹體分布在石英晚期裂隙和亮晶方解石膠結(jié)物中,晚期裂隙切割了早期裂隙或石英加大邊,并切穿了顆粒邊界。通過(guò)對(duì)與烴類共生的鹽水包裹體進(jìn)行均一化溫度測(cè)試,得到兩期流體包裹體的均一溫度:早期主要在90~105~C,晚期主要在105~120~C。兩期均一溫度分布連續(xù),主要集中在90~120~C范圍內(nèi)。結(jié)合流體包裹體含鹽量、密度分析,認(rèn)為研究區(qū)延長(zhǎng)組油氣主要為連續(xù)一期成藏。對(duì)比研究區(qū)埋藏史、地?zé)崾贩治黾把娱L(zhǎng)組儲(chǔ)層伊利石K—Ar同位素定年結(jié)果得出,研究區(qū)主要的油氣成藏期發(fā)
3、生在距今100~120Ma,即早白堊世晚期。關(guān)鍵詞:流體包裹體;成巖作用;油氣成藏;延長(zhǎng)組;子長(zhǎng)地區(qū);鄂爾多斯盆地中圖分類號(hào):TEl22.1文獻(xiàn)標(biāo)識(shí)碼:ACharacteristicsoffluidinclusionsandreservoiringphasesintheYanchangFormationofZichangarea,theOrdosBasinLiangYu,RenZhanli,WangYanlongandShiZheng(1.KeyLaboratoryforContinentalDynamicsofEducationMinistry~Departm
4、entofGeology,NorthwestUniversity,Xi’an,Shaanxi710069,China;2.ZichangOilPlantofYanchangOilfieldCompany,Yan’an,Shaanxi716000,China)Abstract:ThemaindiagenetictypesofsandstonereservoirsintheYanchangFormationofZichangarea,theOrdosBasin,includecompaction,cementation,disolutionandfracturing
5、.Thediageneticauthigenicmineralsaredominatedbychlorite,authigeneticqua~zandcalcite.Twodifferentphasesofhydrocarboninclusionshavebeenidentifiedaccordingtotheformationtimeseriesofthehostdiageneticminerals.Thehydrocarboninclu—sionsformedinthefirstphasemainlyoccurinthedissolutionporesofq
6、ua~zandfeldsparoralongearly—healedfractures,andarecoatedbyqua~zorfeldsparovergrowth.Thehydrocarboninclusionsformedinthesecondphasearedistributedalongthelate-formedfracturesorinsparrycalcitecement.Thelatefracturescuttheearlyfracturesorthequa~zovergrowth,andgobeyondthegraincontact.Theh
7、omogenizationtemperatureofthepa—rageneticbrineinclusionsofhydrocarbonshastwopeaksat90—105~Cand105—120~Crespectively.Analysisofsalinityanddensityofthetwogenerationsoffluidinclusionsrevealthattheoil/gasreservoirsintheYanchangFormationwereformedcontinuouslyinonestage.Thetestdataoffluidi
8、nclusionsand