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1、石油勘探與開(kāi)發(fā)2007年6月PETROLEUMEXPLORATIONANDDEVELOPMENTVol.34No.3291文章編號(hào):1000-0747(2007)03-0291-08鄂爾多斯盆地南部加里東期巖溶古地貌與天然氣成藏條件分析夏明軍,戴金星,鄒才能,汪澤成,陶士振(中國(guó)石油勘探開(kāi)發(fā)研究院)基金項(xiàng)目:國(guó)家重大基礎(chǔ)研究發(fā)展規(guī)劃/9730項(xiàng)目(2001CB209100)摘要:認(rèn)識(shí)鄂爾多斯盆地南部地區(qū)巖溶古地貌和成藏條件是加快該地區(qū)勘探步伐面臨的重要問(wèn)題。鄂爾多斯盆地南部加里東期風(fēng)化殼儲(chǔ)集層的分布主要受巖溶古地貌
2、、風(fēng)化殼層位及沉積相控制。馬五段為云坪相帶,溶蝕孔洞較為發(fā)育;平?jīng)鼋M為深水斜坡相帶,多形成斷裂、裂縫及洞穴儲(chǔ)集空間。中央古隆起西側(cè)古地貌為巖溶斜坡,地表巖溶作用較弱,但斷裂發(fā)育,洞穴系統(tǒng)較發(fā)育;中央古隆起南側(cè)古地貌為巖溶臺(tái)地,斷裂、洞穴系統(tǒng)和風(fēng)化裂隙相對(duì)較為發(fā)育;中央古隆起區(qū)古地貌為巖溶臺(tái)地,地層較老,巖性致密,風(fēng)化殼頂部垂直裂隙帶發(fā)育,巖溶孔洞不發(fā)育;中央古隆起東側(cè)古地貌多屬于巖溶階地或鞍地,風(fēng)化殼多位于云坪及含膏云坪相帶,溶蝕孔洞較為發(fā)育。巖溶古地貌天然氣成藏主控因素主要為生烴中心、巖溶古地貌、風(fēng)化殼的層位和沉
3、積相帶,有利區(qū)帶主要在耀縣、旬邑、淳化平?jīng)鼋M生烴中心和中央古隆起東側(cè)馬五段有利沉積相帶。圖9表1參13關(guān)鍵詞:鄂爾多斯盆地;加里東期;風(fēng)化殼;巖溶古地貌;天然氣中圖分類號(hào):TE121.3文獻(xiàn)標(biāo)識(shí)碼:ACaledoniankarstpalaeogeomorphologyandtheformingconditionofgaspool,southernOrdosBasinXIAMing-jun,DAIJin-xing,ZOUCa-ineng,WANGZe-cheng,TAOSh-izhen(ResearchInstitu
4、teofPetroleumExploration&Development,PetroChina,Beijing100083,China)Abstract:ThedistributionofCaledonianresiduumreservoirsinthesouthofOrdosBasinismainlycontrolledbykarstpalaeogeomorphology,strataofresiduumandsedimentaryfacies.ThefaciesoftheO1m5residuumisdolomi
5、tictidalflats,withwel-ldevelopeddissolvedpores;whilethatofO2pisdeepwaterslopes,withabundantfaults,fracturesandcaves.Onthecentralpalaeohigh,palaeogeomorphologyisplatformscomposedofoldstrataandcompactedrock,withverticalfracturedzonesattheresiduum'stop;onthewests
6、ide,itisslopeswithwel-ldevelopedfracturesandcaverns;onthesouthside,itisplatformswithwel-ldevelopedfaults,caverns,andweatheringfractures;ontheeastside,itismostlyterracesorsaddle-shapedterrain,withabundantdissolvedporesintheresiduumwhichlocatesondolomiticoranhyd
7、rite-bearingdolomitictidalflats.Themaincontrollingfactorsoftheformingofgaspoolarehydrocarbongeneratingcenter,palaeogeomorphology,strataofresiduumandsedimentaryfacies.FavorablezonesaretheO2phydrocarbongeneratingcenterinYaoxian,XunyiandChunhuaandtheO1m5ineastern
8、centralpalaeohigh.Keywords:OrdosBasin;Caledonian;residuum;karsticpalaeogeomorphology;naturalgas3[2]為244000億m,第三輪資源評(píng)價(jià)結(jié)果表明,盆地南0引言3[3]部古生界有15000億m天然氣資源量。鄂爾多斯盆地中部的靖邊氣田2000年探明天然靖邊氣田的形成除