資源描述:
《鄂爾多斯盆地延長(zhǎng)組長(zhǎng)7油層組石油成藏條件分析》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、第36卷第3期石油察繡沾屆Vo1.36.No.32014年5月PETROLEUMGEOLOGY&EXPERIMENTMay,2014文章編號(hào):1001-6112(2014)03-0285—06doi:10.11781/sysydz201403285鄂爾多斯盆地延長(zhǎng)組長(zhǎng)7油層組石油成藏條件分析時(shí)保宏,鄭飛,張艷,黃靜,張雷(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)石油長(zhǎng)慶油田分公司勘探開發(fā)研究院,西安710018;3.低滲透油氣田勘探開發(fā)國(guó)家工程實(shí)驗(yàn)室,西安710018)摘要:鄂爾多斯盆地長(zhǎng)7油層組沉積期是湖盆發(fā)育的鼎盛期,不但沉積了大面積分布的優(yōu)質(zhì)烴
2、源巖,而且還發(fā)育一定規(guī)模的儲(chǔ)層。對(duì)儲(chǔ)層所處沉積環(huán)境、儲(chǔ)層特征、成巖相及生、儲(chǔ)、蓋組合等綜合地質(zhì)條件進(jìn)行分析研究,結(jié)果表明,長(zhǎng)7儲(chǔ)層烴源條件優(yōu)越。有利儲(chǔ)集體主要為三角洲前緣的水下分流河道及半深湖一深湖相濁積巖,巖石類型以低成分成熟度的巖屑長(zhǎng)石砂巖和長(zhǎng)石巖屑砂巖為主,儲(chǔ)層物性差,孔隙度平均8.45%,滲透率平均0.12x10一m,屬超低孔低滲儲(chǔ)層;發(fā)育5種成巖相類型。最有利成巖相為膠結(jié)作用一微孔粒間孔和溶蝕作用一溶孔微孔成巖相,分布面積有限;儲(chǔ)層物性最差的為壓實(shí)膠結(jié)一微孑L成巖相.分布面積較廣。半深湖一深湖沉積環(huán)境導(dǎo)致長(zhǎng)7儲(chǔ)層橫向連通性差,縱向隔夾層多,油氣只能通過垂向和短距
3、離的側(cè)向運(yùn)移,在遇到泥巖遮擋層或致密砂巖遮擋時(shí)在相對(duì)物性較好的儲(chǔ)層中聚集成藏。關(guān)鍵詞:烴源條件;沉積條件;儲(chǔ)集條件;成藏條件;長(zhǎng)7油層組;鄂爾多斯盆地中圖分類號(hào):TEl22.3文獻(xiàn)標(biāo)識(shí)碼:AHydrocarbonaccumulationconditionsofChang7section,YanchangFormation,OrdosBasinShiBaohong,ZhengFei,ZhangYan,HuangJing一,ZhangLei,(1.SchoolofEarthSciencesandEngineering,Xi’anShiyouUniversity,Xi’an,S
4、haanxi710065,China;2.PetroleumExplorationandDevelopmentResearchInstituteofPetroChinaChangqingOieldCompany,Xi’an,Shaa~i710018,China;3.NationalEngineeringLaboratoryforLowPermeabilityPetroleumExplorationandD~/optrent,X/’an,Shaa~71O0l8.cM)Abstract:TheOrdosLakeinChang7phasewaslargestanddeepest
5、inYanchangperiod,anddepositedhigh.qualityandwidely—distributedsourcerockswithsomesandstonesofdeltafrontfaciesandturbiditesfacies.Theanalysesofdepositionenvironment,reservoirfeature,diageneticfaciesandtheassemblageofsource,reservoirandcapshowedthattheChang7sectionhadfavorablesourceconditio
6、ns.Thefavorablereservoirsmainlyincludedturbiditesofunderwaterdistributarychannelatdeltafrontandsemi—deep/deeplakefacies.Thesandstonesweremainlylithicarkosesandstonesandfeldspathiclithicsandstoneswithlowcompositionalandtexturalmaturities.Thereservoirshadlowporosity(8.45%inaverage)andlowper
7、meability(0.12x10一minaverage).Chang7sandstonesweredividedinto5diageneticfaciestypes,amongwhichthemostfavorabletypewasthecemetation-microporeintergranularporeanddissolution—disslovedporeAndmicroporediageneticfacies,butthedistributionareawaslimited.Thediageneticfacies