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时间:2020-01-14
《四川盆地东部上石炭统黄龙组沉积体系及其演化.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、石油勘探与开发4002011年8月PETROLEUMEXPL0RAT10NANDDEVEL0PMENTVO1.38N0.4文章编号:1000-0747(2011)04-0400。09四川盆地东部上石炭统黄龙组沉积体系及其演化李伟2,张志杰,党录瑞(1.提高石油采收率国家重点实验室;2.中国石油勘探开发研究院;3.中国石油西南油气田公司重庆气矿)基金项目:中国石油科技项目“四川盆地石炭系油气地质综合研究与有利区带优选”(2008D.0704.04)摘要:以川东上石炭统黄龙组碳酸盐岩岩性地层气藏为目标,开展新一轮系统基础地质研究。根据陆源
2、碎屑沉积发育特点与悬浮且具有一定磨圆度砾石的发育位置推断海侵方向与潮汐沉积体系分布,认为上石炭统黄龙组发育云阳东南部与达州西北部两个海侵通道,并形成了重庆一万州与达州东南部两个潮坪沉积体系,发育了一套由低水位体系域(C2h1)一海进体系域(C2h2)一早期高水位体系域(C2h3)组成的较完整的I型层序。精细刻画黄龙组各段沉积微相分布特征,川东晚石炭世中期为海进体系域发育期,浅滩与藻云坪微相较发育,有利于碳酸盐岩岩性圈闭的形成;晚石炭世早期与晚期分别为低位体系域与高位体系域发育期,其浅滩沉积微相发育局限,不利于碳酸盐岩岩性圈闭的规模形成
3、。图7参17关键词:四川盆地东部;黄龙组;碳酸盐岩;沉积体系;沉积微相中图分类号:TEl22.1文献标识码:ADepositionalsystemsandevolutionoftheUpperCarboniferousHuanglongFormationintheeasternSichuanBasinLiWei’。,ZhangZhijie’。,DangLurui。(1.StateKeyLaboratoryofEnhancedOilRecovery,Beo'ing100083,China;2.PetroChinaResearchInst
4、ituteofPetroleumExploration&Development,Beijing100083,China;3.ChongqingGasDistrict,PetroChinaSouthwestOil&GasfieldCompany,Chongqing400021,China)Abstract:NewresearchonbasicgeologyhasbeendoneforUpperCarboniferouscarbonatelithologicgaspoolsintheHuanglongFormationintheeaste
5、rnSichuanBasin.Basedonthedevelopmentcharacteristicsofterrigenousclasticdepositandthedevelopmentlocationofsuspendinggravelswithsomepsephicity,thetransgressiondirectionandtidaldepositionalsystemdistributionarededuced.Itisbelievedthat,twotransgressionchannelsweredevelopedi
6、nsoutheastofYtmyangandnorthwestofDazhouinthearea,twotidal—flatdepositionalsystemsinChongqing—WanzhouandsoutheastofDazhourespectivelywereformed,andasuitofcompletetype—Isequencecomposedoflowstandsystemstract(C2h1),transgressivesystemstract(C2h2)andearlyhighstandsystemstra
7、ct(C2h3)wasdeveloped.SedimentarymicrofaciesfeatLlresofeachmemberoftheHuanglongFormationweredelineatedfinely.InthemiddlestageoflateCarboniferous,transgressivesystemstractwasdevelopedineasternSichuan,whereshallowbeachandalgaldolomite—flatmicrofaciesweredeveloped.whicharef
8、aVorableforthedevelopmentofcarbonatelithologictraps.Incontrast.intheearlyandlatestagesoflateCarboniferous,lows
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