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时间:2020-04-23
《四川盆地下寒武统龙王庙组颗粒滩发育规律-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第34卷第8期地质勘探·27·四川盆地下寒武统龙王庙组颗粒滩发育规律周进高房超季汉成。张建勇赵菲1.中国石油杭州地质研究院2.中国石油大学(北京)地球科学学院周进高等.四川盆地下寒武统龙王庙组颗粒滩发育规律.天然气工业,2014,34(8):27—36.摘要四川盆地下寒武统龙王庙组是新近发现的迄今为止我国单体规模最大的特大型海相碳酸盐岩整装气藏,该气藏储层受碳酸盐岩颗粒滩相控作用明显。进一步了解该区颗粒滩的时空分布规律,对于更好地预测龙王庙组储层分布具有重要意义。为此,针对沉积古地貌、海平面变化及古水深等影
2、响滩体发育的主控因素,以3口井结合2个野外剖面点作为实例,对该盆地龙王庙组颗粒滩纵向叠置关系和横向分布规律进行了研究,并取得以下认识:①龙王庙组沉积时期为缓坡沉积环境,分为内缓坡相、中缓坡相和外缓坡相,颗粒滩主要发育在内缓坡相和中缓坡相;②盆地内自西向东颗粒滩厚度逐渐变大,以发育白云岩滩逐步被石灰岩滩取代为特征;③颗粒滩纵向上主要发育砂屑云岩一泥晶云岩泥质泥晶云岩、砂屑云岩一细粉晶云岩一泥质泥晶云岩、粉晶灰岩一砂屑灰岩一泥晶云岩一泥质泥晶云岩、鲕粒灰岩一泥晶灰岩等岩性组合;④颗粒滩横向上具有沿膏岩湖两侧呈条
3、带状展布的特征,主要发育在缓坡隆起区,尤其是隆起区中的微地貌高地是滩体发育的有利区。关键词四川盆地早寒武世龙王庙组气藏颗粒滩海平面变化古地貌沉积相分布规律有利区D0I:10.3787/j.issn.1000—0976.2014.08.005AdevelopmentruleofLowerCambrianLongwangmiaograinbeachesintheSichuanBasinZhouJingao,FangChao。,JiHancheng,ZhangJianyong,ZhaoFei(1.Hangzhou
4、ResearchInstituteofGeology,PetroChina,Hangzhou,Zejiang310023,China;2.CollegeofGeosciences,ChinaUniversityofPetroleum,Beijing102249,China)NATUR.GASIND.VOLUME34,ISSUE8,pp.27—36,8/25/2014.(ISSN1000—0976;InChinese)Abstract:Greatprogresshasbeenmadethroughyearso
5、fexplorationintheLowerCambrianLongwangmiaoFmintheSichuanBasin.TolearnmoreaboutthespatialandtemporaldistributionofgrainbeachesissignificanttopredictingthedistributionofLong—wangmiaoFmreservoirs.Therefore,accordingtOthecontrollingfactorsofbeach-bodydevelopme
6、nt,suchasdepositionpalaeogeo—morphology,sealevelchange,palaeobathymetry,etc.,weconductedtheresearchofverticalsuperimposedrelationshipandhorizon—taldistributionruleoftheLongwangmiaoFmgrainbeacheswith3exploratorywells3Sstudycasesintegratedwithtwofieldprofile
7、sections.Thefollowingfindingswereconcluded.(1)LongwangmiaoFmsedimentsoccurredinagentleslopedepositionalenvironment,whicharedividedintotheinternalrampfacies,middlerampfaciesandexternalrampfacies,andgrainbeachesaremainlydevelopedininternalrampfaciesandmiddle
8、rampfacies.(2)ThethicknessofbeachesisgraduallybecominglargerandthedolomitebeachesaregraduallybeingreplacedbylimestonebeachesfromthewesterntOeasternpartsoftheSichuanBasin.(3)Ongrainbea—chesarelongitudinallydev
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