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1、第35卷第1期洛石、,o1.35NO.12015年3月OFFSHOREOILMar.2015文章編號:1008.2336(2015)01.0052.06廟西凹陷中南洼烴源巖評價及其勘探啟示張宏國,官大勇,宿雯,王廣源,麻旭剛(中海石油(中國)有限公司天津分公司渤海油田研究院,天津300452)摘要:渤海邊緣洼陷整體勘探程度較低,烴源巖生、排烴能力分析是研究重點。為明確廟西凹陷中南洼地區(qū)油氣富集規(guī)律,從烴源巖分析和油源對比入手,明確低熟油優(yōu)勢運移通道類型,進而預(yù)測油氣富集層位與區(qū)帶。研究表明,中南洼地區(qū)發(fā)育巨厚沙三段,其有機質(zhì)母質(zhì)類型以混源為主,沉積水體為半成水一咸水環(huán)境,現(xiàn)
2、處于低熟階段,為蓬萊25.6油田主要油源,證明其為研究區(qū)主力生烴層系。烴源巖熱演化與排烴強度分析表明廟西凹陷中南洼烴源巖熱演化程度較低,而低熟油初次運移動力較弱,因此單一型的油氣二次運移通道運移量高于復(fù)合型通道,沿斷層近距離運移館陶組就近成藏幾率較大。研究區(qū)中部走滑帶斷層活動性強且深切油源,主干走滑和其派生斷層形成背斜形態(tài)圈閉,具有良好的勘探潛力。關(guān)鍵詞:廟西凹陷中南洼;烴源巖評價;低熟油;運移通道;走滑斷層中圖分類號:TEl22.2文獻標(biāo)識碼:ADOI:10.3969~.issn.1008.2336.2015.01.052EvaluationonSourceRocksin
3、MiaoxiMiddle-SouthernSagandItsAspirationtoExplorationZHANGHongguo,GUANDayong,SUWen,WANGGuangyuan,MAXugang(ResearchInstituteofBohaiOilfield,TianjinBranchofCNOOCLtd.,Tianjin300452,China)Abstract:TheexplorationdegreeonmarginalsagsinBohaiSeaislOW,andtheexplorationkeyistostudythehydrocarbongen-
4、erationandexpulsioncapabilityofsourcerocks.InordertomakeclearaboutthehydrocarbonaccumulationregularityinMiaoximiddle—southernsag,analysisofgeochemicalcharacteristicofsourcerockandoil—sourcecorrelationhavebeenconducted,andtheadvantagehydrocarbonmigrationpathwaysforlowmatureoilshavebeenmadec
5、lear.Inaddition,thehydrocarbonrichtargetseriesandzoneshavebeenforecasted.ThestudyresultsindicatedthatSha·3MemberisthickandwelldevelopedinMiaoximiddle-south—emsag,theorganicmattermatrixtypeofsourcerockaremainlymixedtype,depositedinbrackishwaterandsaltywaterenviron—ments,beingmainoilsourcesf
6、orPenglai25—6oilfieldwithlowmatureoil.IthasbeenprovedthatSha-3Memberisthemainhydro—carbongenerationseriesforthestudyarea.TheanalyzingresultsaboutthermalevolutionofsourcerockandhydrocarbonexpulsionintensityindicatedthatthethermalevolutiondegreeofsourcerockislowinMiaoximiddle-southernsag,and
7、thedrivingforceforprimaryhydrocarbonmigrationislow.Therefore,theamountofhydrocarbonmigratedthroughsingletypeofsecondarypathwayishigherthanthatthroughcompoundpathway,andthechanceofhydrocarbonaccumulationinGuantaoformationthroughshortdis—tancemigrationbyfaultswa