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时间:2020-03-28
《四川盆地南缘寒武系膏溶角砾岩的识别标志及勘探意义.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第33卷第1期石油察,诒弛届Vo1.33,No.12011年2月PETROLEUMGE0LOGY&EXPERIMENTFeb。,2011文章编号:1001—6112(2oi1lOl一0022-06四川盆地南缘寒武系膏溶角砾岩的识别标志及勘探意义彭勇民,高波,张荣强,张殿伟孙冬胜,沃玉进,周雁',汪新伟,李双建(中国石油化工股份有限公司石油勘探开发研究院,北京100083)摘要:在四川盆地南缘寒武系地表露头上,发现了与雷波县火草坪、甘洛县黑马石膏岩密切共生的膏溶角砾岩;在寒武系实测剖面上,发现了抓抓岩剖面13层3O余
2、m、长坪剖面4层17.5m、范店削面4层2O余m以及三汇场剖面4层35nl的膏溶角砾岩。膏溶角砾岩分为紫红色含石膏角砾状泥岩和灰黄色膏溶角砾状白云岩2类,局部保存较好的纹层状与条带状构造;角砾大,J、一般为大于2crux3cm;成分为泥晶白云岩,胶结物为粘土与方解石;其原岩为韵律条带状白云质石膏岩,可以与丁山1井的中下寒武统的条带状石膏类岩层(26.9m/10层)很好地对比推测从川东南往四川盆地内部具有更好的渴湖微相厚层石膏岩,从而改变了以往该区无膏盐岩的看法。关键词:石膏;膏溶角砾岩;寒武系{油气勘探;嘎川I簸地
3、南缘中图分类号:TE122.25文献标识码:ADistinguishingindicatorsandprospectsignificanceofCambriandissolvedgypseousbrecciasinsouthernSichuanBasinPengYongmin,GaoBo,ZhangRongqiang,ZhangDianwei,SunDongsheng,WoYujin,ZhouYan,WangXinwei,LiShuanjJan(SINOPECExplorationandProductionRese
4、arc’hInstitute,Beijing100083,China)Abstract:DissolvedgypseousbrecciaswerediscoveredwithgypseousrocksintheCambriansur{aceout—cropsinHuocaopingregionofLeiboCountyandHeimaregionofGanluoCountyinthesouthernSichuanBasin.AccordingtoprofileanalysesoftheCambrian,severa
5、ldissolvedgypseousbrecciaswerefoundinZhuazhuayan(13layers,over30mthick),Changping(4layers。17.5mthick),Fandian(4layers,over20mthick)andSanhuichang(4layers,35mthick).Thedissolvedgypseousbrecciasweredividedinto2types,includingamaranthgypsum—bearingbrecciamudstone
6、sandlarkgypsum—dissolvedbrecciadolostones。withlocallywellpreservedlamellarandflaserdepositstructures.Thebrecciasweregene—rally3cmlongand2cmwide.Thecompositionsweremicritedolostonesandthecementsincludedclaysandcalcites.Initialrocksofthedissolvedgypseousbreccias
7、wererhythmicallybandingdolomiticgypse-OUSrocks,whichcouldbecomparedwiththeMiddleandLowerCambriangypseousrocks(10lay—ers。26.9m)fromWellDingshan1.ItiSpredictedthat,fromthesoutheasttothecenterofthebasin,thereexistthickgypseousrocksoflagoonfacies.Keywords:gypsum;d
8、issolvedgypseousbreccia;Cambrian;petroleumexploration;southernSichuanBasin四川盆地南部分布良好的寒武系与震旦系地了寒武系甚至震旦系的膏盐岩,但在这些地区层露头(图1),寒武系的膏溶角砾岩广泛分布于南始终未见到相匹配的石膏岩露头,唯一可以类比的部(如黔中隆起)及东缘(如湘鄂西片区),大方
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