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1、白玉*j,孫懷曹21郝孝榮,陳標(biāo),劉鵬(1西安石油大學(xué)地球科學(xué)與工程學(xué)院,西安710065;2中國(guó)石油大慶油田有限責(zé)任公司地球物理物探一公司,黑龍江大慶163354;3延長(zhǎng)油田股盼有限公司,陜西延安716000;4中國(guó)石油集團(tuán)測(cè)井有限公司技術(shù)中心,西安710018)摘要:根據(jù)砂巖薄片、鑄體薄片、陰極發(fā)光、掃描電鏡、黏土礦物x衍射等分析測(cè)試資料,對(duì)鄂爾多斯盆地安塞地區(qū)延長(zhǎng)組長(zhǎng)9致密砂巖儲(chǔ)集層成巖作用進(jìn)行了研究。結(jié)果表明,長(zhǎng)9砂巖儲(chǔ)集層主要經(jīng)歷了壓實(shí)、膠結(jié)和溶蝕等多種成巖作用,其中壓實(shí)和膠結(jié)作用為減少儲(chǔ)集層孔隙的主要因素,溶蝕作用是增加儲(chǔ)集層孔隙的主要因素
2、,微裂縫一定程度上提高了儲(chǔ)集層的滲透性,增強(qiáng)了流體滲流能力。長(zhǎng)9砂巖儲(chǔ)集層主要處于中成巖作用階段A期,儲(chǔ)集層孔隙演化與成巖作用關(guān)系密切,壓實(shí)作用損失的孔隙度為1564%,膠結(jié)作用損失孔隙度為1132%,溶蝕作用和微裂縫增加孔隙度為404%,最終研究區(qū)計(jì)算孔隙度定格為748%,與實(shí)測(cè)平均孔隙度值720%比較一致。長(zhǎng)9儲(chǔ)集層有利成巖相帶為長(zhǎng)石溶蝕相和綠泥石膜長(zhǎng)石溶蝕相,發(fā)育于水下分流河道沉積微相中,最不利成巖相為碳酸鹽膠結(jié)相和強(qiáng)壓實(shí)相。關(guān)鍵詞:鄂爾多斯盆地;安塞地區(qū);延長(zhǎng)組儲(chǔ)集層;致密砂巖;成巖作用;成巖相文章編號(hào):10013873(2014)O10023
3、06中圖分類(lèi)號(hào):TEl2221文獻(xiàn)標(biāo)識(shí)碼:ADiagenesisinTightSandstoneReservoiroftheChang一9IntervalinAnsaiAreainOrdosBasinBAIYubin,SUNHuaizhi,HAOXiaorong,CHENDong,LIUPeng(1SehoolofEarthSciencesandEngineering,Xi’anShiyouUniversity,Xi’an,Shaar~xl710065,China;2No1GeophysicalExplorationCompany,DaqingOilf
4、ieldCompanyLtd,Daqing,Heilongjiang163354,China;3YanehangOilfieldCorporation,Yan’an,Shaar~xl716000,China;4Teehnolog7Center,Log~ngCompanyLtd,CNPC,Ⅺ’an,Shaanxl710018,China)Abstract:Accordingtotheanalysisandtestingdatafromsandstonethin—seetion,eastthin—seetions,eathodolumineseenee,s
5、eanningelee—tronmieroseope.X—raydiff"action.thediagenesisofChang一9tightsandstonereservoirinAnsaiareainOrdosbasinisstudiedTheresultsshowthatChang一9sandstonereservoirwentmainlythrougheompaetion,eementationanddissolution,ofwhichtheeompaetionandeelllen—rationarethemainfaetorsforredu
6、eingreservoirporosity,thedissolutionisthemainfaetorforinereasingreservoirporosity,whilethemicro—fracturesserveasimprovingthereservoirpermeabilityandinereasingthefluidpereolationabifityinaeertmnextentTheChang一9sand—stonereservoir’sdiagenesisbelongstothe“A”phaseofmediumdiagenesis.
7、withdoserelationsbetweenporosityevolutionanddiagene—sisTheeompaetionmadetheporositylossof1564%.theeementafionmadetheporositylossof1132%.thedissolutionandmicro—ffae—turesinereasedporosityof404%.heneethecalculatedporosityinthestudyareaisdeterminedas748%.whichisrelativelyconsistent
8、withtheaveragevalueofthemeasuredporosityof720%T