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1、學兔兔www.xuetutu.com-5天乞北第36卷第6期OIL&GASGE0L0GY2015年12月文章編號:0253—9985(2015)06—0888—09doi:10.11743/ogg20150603北黃海東部次盆地油氣成藏主控因素劉金萍,王改云,王嘹亮,簡曉玲,杜民,萬曉明(國土資源部廣州海洋地質(zhì)調(diào)查局國土資源部海底礦產(chǎn)資源重點實驗室,廣東廣州510075)摘要:北黃海東部次盆地尚處于勘探早期,石油地質(zhì)條件復雜,油氣成藏主控因素尚未探明。結(jié)合目前勘探成果,利用多口鉆井資料,綜合運用油氣地球化學、烴源巖有機相劃分、儲層成巖作用和流體包裹體測溫等手段,確定了東部次
2、盆地的油氣成藏主控因素。分布局限的中、低豐度烴源巖決定了東部次盆地油氣平面分布范圍,并決定了油氣縱向上也是圍繞烴源巖出現(xiàn),而在遠離主生烴灶的構造帶和遠離主力烴源巖的層段則難以運聚成藏;早期緩慢淺埋一中期強烈隆升一晚期快速深埋的沉積過程影響了油氣分布,這一特殊的沉積埋藏過程控制了東部次盆地烴源巖生、排烴歷史和儲層演化史,造成東部次盆地大量生、排烴和成藏事件均發(fā)生在新近紀,而受成巖作用等因素的影響,此時主要目的層儲層已大面積低孔、低滲,油氣難以長距離運移,最終導致東部次盆地難以發(fā)生大規(guī)模的油氣運聚成藏。綜合而言,東部次盆地的油氣成藏特征屬于近源成藏,因此近主生烴灶的勘探目標風險
3、小,下步勘探要在臨近主生烴灶、同時儲集條件有利的二級構造帶上尋找以構造圈閉和構造一巖性復合圈閉為主的勘探目標。關鍵詞:沉積過程;油氣分布;油氣成藏;東部次盆地;北黃海中圖分類號:TEl22.3文獻標識碼:AMaincontrollingfactorsofhydrocarbonaccumulationintheEasternSub-basin,NorthYellowSeaLiuJinping,WangGaiyun,WangLiaoliang,JianXiaoling,DuMin,WanXiaoming(MLRKeyLaboratoryofMarineMineralResour
4、ces,GuangzhouMarineGeologicalSurvey,Guangzhou,Guangdong510075,China)Abstract:EasternSub—basinoftheNorthYellowSeaisstillintheearlystageofexploration,itspetroleumgeologiccondi—tionsarecomplex,andthemaincontrollingfactorsofhydrocarbonaccumulationarestillnotclear.Drillingdata,petroleumgeochemi
5、stry,organicphaseclassification,diagenesisandfluidinclusionthermometrywereintegratedtodeterminethemaincontrollingfactorsofhydrocarbonaccumulation.Thedistributionofsourcerockswithlowtomoderateabundancehascontrolledtheareaofoilandgas,andthehydrocarbonsoccurtypicallyadjacenttothesourcerocksin
6、vertica1.Butitisdifficultforoilandgastoaccumulateinthestructuralzonefarawayfromthe“hydrocarbonkitchen”andthemainsourcerockintervals.Thesedimentaryprocessofslowlyandshallowburialinearlystage—intenseupliftinmiddlestage—rapidlyanddeepburialinlatestageafectedthedistributionofhydrocarbons.Thiss
7、pecialsedimentary—burialprocessalsocontrolledthegeneration—expulsionhistoryandthereservoirevolutionhistoryintheEasternSub—basin,andresultedinthattheeventsofgenerationandexpulsionandaccumulationofhydrocarbonalloccurredduringtheNeogene.Duetotheinfluencesofdiagen