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1、第33卷第4期石油察劈沾屆Vo1.33.No.42011年8月PETR0LEUMGEOLOGY&EXPERIMENTAug.,2011文章編號(hào):1001—6112(2011)04—0353—06塔里木盆地巴什托油氣田石炭系碳酸鹽巖沉積相特征嚴(yán)繼新,趙習(xí)森,何云峰,鐘學(xué)彬,魏少華,周剛(中國(guó)石油化工股份有限公司華東分公司非常規(guī)指揮部,南京210019)摘要:塔里木盆地巴什托區(qū)塊石炭系包括3個(gè)組,自下而上為巴楚組、卡拉沙依組和小海子組。沉積相為碳酸鹽巖臺(tái)地,包括蒸發(fā)臺(tái)地、局限臺(tái)地、開(kāi)闊臺(tái)地3種亞相。巖石類(lèi)型主要為碳酸鹽巖,夾薄層碎屑巖和膏巖。巴楚組
2、沉積晚期,本區(qū)陸源碎屑物質(zhì)注入急劇減少,形成了一套富含生物碎屑的碳酸鹽巖地層,發(fā)育局限臺(tái)地亞相沉積??ɡ骋涝缰衅跒檎舭l(fā)臺(tái)地夾局限臺(tái)地亞相沉積,晚期為局限臺(tái)地環(huán)境。小海子期海侵范圍擴(kuò)大,大部分地區(qū)為開(kāi)闊臺(tái)地沉積。由于海平面升降變化的周期性,使各種微相類(lèi)型在垂向序列上呈規(guī)律性重復(fù)疊置,從而在空間上構(gòu)成有規(guī)律的儲(chǔ)蓋組合,石炭系共發(fā)育3套良好儲(chǔ)蓋組合,其中小海子組發(fā)育2套,巴楚組發(fā)育1套。小海子組油氣層主要分布在BK4H一麥4一麥6井一帶的構(gòu)造高部位。巴楚組油氣層分布于麥10一BK4H一麥6井一帶的構(gòu)造高部位。關(guān)鍵詞:沉積相特征;石炭系;巴什托區(qū)塊;
3、塔里木盆地中圖分類(lèi)號(hào):TEl21.3文獻(xiàn)標(biāo)識(shí)碼:ASedimentaryfaciesofCarboniferouscarbonaterockinBashitopOilField,TarimBasinYanJixin,ZhaoXisen,HeYunfeng,ZhaoXuebin,WeiShaohua,ZhouGang(HeadquarterforUnconventionalPetroleumExploration,EastChinaBranchCompany,SINOPEC,Nanjing,Jiangsu210019,China)Abstract
4、:InBashitopareaoftheTarimBasin,frombottomtotop,Carboniferouscanbedividedinto3forma—tions:Bachu,KalashayiandXiaohaizi.Sedimentaryfaciesofthestudyareaarecarbonateplatform,whichmaybefurtherdividedinto3subfaciesincludingevaporated,restrictedandopenones.Carbonaterocksareveryeom—m
5、on,interbeddedwithclasticandgypsumrocks.DuringthelateBachuperiod,terrigenousdetritalsuppliesdecreasedandasetofcarbonaterockrichinbiodetrituswasformed,andtherestrictedplatformsubfa—cieswasdeposited.DuringtheearlyandmiddleKalashayiperiod,thestudyareawasdominatedbyevaporatedand
6、restrictedplatformsubfacieswhileinthelateKalashayiperiod,itturnedtorestrictedplatform.IntheXiaohaiziperiod,openplatformspreadinmostofthestudyarea.Duetothecyclicityofsealevelchange,allmicrofacieslieinruleandformreservoir—sealassemblages.3above—mentionedassemblageshavebeenfoun
7、dinCarboniferous,2intheXiaohaiziFormationand1intheBachuForma—tion.PetroleumintheXiaohaiziFormationmainlylocatesaroundwellBK4H,M4andM6.PetroleumintheBachuFormationmainlylocatesaroundwellM10,BK4HandM6.Keywords:sedimentaryfacies;Carbonerous;Bashitoparea;TarimBasin巴什托石炭系油氣田位于新疆維
8、吾爾自治區(qū)石炭系為一套以淺海臺(tái)地相碳酸鹽巖為主的沉巴楚縣西南部曲苦恰克鄉(xiāng),塔克拉瑪干大沙漠西北積建造,自下而上可分為下石炭統(tǒng)巴楚組和卡拉沙緣(圖1)。