資源描述:
《鄂爾多斯盆地東部盒8致密砂巖沉積特征及沉積模式.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、第34卷第10期地質(zhì)通報(bào)Vo1.34.No.102015年1O月GEoLoGICALBULLETINoFCHINAoCt一2015鄂爾多斯盆地東部盒8致密砂巖沉積特征及沉積模式郭艷琴,余芳,李洋,李百強(qiáng),李文厚。,袁珍,趙靖舟GUOYanqin,YUFang2,LIYang,LIBaiqiang,LIWenhou,YUANZhen,ZHAOJingzhou1.西安石油大學(xué)地球科學(xué)與工程學(xué)院,陜西省油氣成藏地質(zhì)學(xué)重點(diǎn)實(shí)驗(yàn)室,陜西西安710065;2.中國石油長慶油田分公司勘探開發(fā)研究院,陜西西安710018;3.西北大學(xué)地質(zhì)學(xué)系,陜西西安7100691.SchoolofEarthScience
2、sandEngineeringXi’anShiyouUniversity,KeyLaboratoryofShaanxiProvinceforOilandGasAccumulationGeology,Xi"anShiyouUniversity,Xi’an710065,Shaanxi,China;2.PetroleumExplorationandDevelopmentResearchInstituteofPetroChinaChangqingOilfieldCompany,Xi"an710018,Shaanxi,China;3.DepartmentofGeology,NorthwestUnive
3、rsity,Xi’an710069,Shaanxi,China摘要:野外露頭剖面和井下巖心的巖石學(xué)與巖相組合、沉積特征與巖相標(biāo)志、室內(nèi)砂巖碎屑礦物組成及其平面分布規(guī)律的研究結(jié)果表明,鄂爾多斯盆地東部盒8致密砂巖以巖屑砂巖為主,其次為巖屑石英砂巖,主要為深灰色、灰色、灰白色中砂巖和粗砂巖。研究區(qū)從北到南依次為沖積扇、辮狀河及辮狀河三角洲沉積體系。沖積扇以扇中和扇端為主,主要由沖積水道塊狀構(gòu)造含礫粗砂巖組成。往南演化為辮狀河沉積,主要包括河道砂壩和泛濫平原微相,其中河道砂壩為其骨架相,由大型交錯(cuò)層理和平行層理發(fā)育的粗砂巖和含礫粗砂巖組成。南部發(fā)育辮狀河三角洲平原和前緣沉積,進(jìn)一步劃分出分流河道、
4、泛濫平原、水下分流河道和分流間灣微相,其中分流河道及水下分流河道為其骨架相,類似于河道砂壩沉積,主要由板狀、槽狀交錯(cuò)層理粗砂巖及中一細(xì)砂巖組成,縱向上多期砂體疊置,橫向上疊合成片,成為盒8致密砂巖氣藏的良好儲(chǔ)集層。關(guān)鍵詞:鄂爾多斯盆地;盒8段;致密砂巖;沉積特征中圖分類號(hào):文獻(xiàn)標(biāo)志碼:A文章編號(hào):1671—2552(2015)10—1971—10GuoYQ,YUF,LiY,LiBQ,LiWH,YuanZ,ZhaoJZ.SedimentarycharacteristicsandmodelofthetightsandofHe8formationineasternOrdosBasin.Geolog
5、icalBulletinofChina,2015,34(10):1971—1980Abstract:Studiesofthepetrology,faciesassemblages,sedimentaryandfaciescharacteristicsbytypicaloutcropsandwelcoresaswellasdetritalmineralsinsandstonesandtheirdistributioncharacteristicsindicatethatthetightsandofHe8formationineasternOrdosBasinismainlylithicsand
6、stoneandsubordinatelylithicquartzsandstonewhosecolorsaredarkgray,ayandgrayishwhite,withthegrainsbeingmediumsandandcoarsesand.TheredevelopthreesedimentarysystemsfromnorthtOsouthwhichincludealuvialfan,braidedchannelandbraideddelta.AⅡuvia1fanfaciesinvolvechieflymiddle—fanandmargin—fansubfacieswhichcon
7、sistofgravelgritwhichexhibitsmassivestructureandwasderivedfromalluvialchanne1.Thereexistsfiverdepositionsouthwardwhichincludesfiverchannelsanddammicrofaciesandfloodplainmicrofacies,inwhichtheriverchannelsan