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1、第37卷第3期石油察豁弛屆Vo1.37,No.32015年5月PETROLEUMGEOLOGY&EXPERHENTMay,2015文章編號:1001-6112(2015)03—0314—06doi:10.7603/s40972-015—0048—9四川盆地南川地區(qū)婁山關(guān)群碳酸鹽巖成巖作用研究蔣小瓊,管宏林,劉光祥,李建明,羅開平,顏佳新,葉愷,韓或(1.中國地質(zhì)大學(xué)(武漢)地球科學(xué)院,武漢430074;2.中國石化石油勘探開發(fā)研究院無錫石油地質(zhì)研究所.江蘇無錫214126;3.長江大學(xué)地球科學(xué)學(xué)
2、院。武漢430100)摘要:四川盆地南川地區(qū)中一上寒武統(tǒng)婁山關(guān)群儲層主要為臺地邊緣灘沉積,以白云巖為主。主要成巖作用類型有:白云巖化、溶蝕、破裂、膠結(jié)充填及壓實壓溶作用,對儲層形成有重要貢獻(xiàn)的成巖作用是白云巖化作用、溶蝕作用及破裂作用根據(jù)白云石標(biāo)型特征、有序度、碳氧同位素的分析,認(rèn)為婁山關(guān)群白云巖成因有3種:準(zhǔn)同生、混合水以及埋藏白云巖化作用,以準(zhǔn)同生白云巖化作用為主。儲層發(fā)育3期溶蝕作用:大氣淡水溶蝕、埋藏溶蝕和表生溶蝕,以表生溶蝕作用為主。白云巖化作用和表生溶蝕作用是形成優(yōu)質(zhì)儲層的關(guān)鍵,而膠
3、結(jié)、充填作用破壞了大量的原生和次生孔隙,不利于儲層的發(fā)育。關(guān)鍵詞:成巖作用;碳酸鹽巖;儲層;婁山關(guān)群;中一上寒武統(tǒng);南JIl地區(qū);四川盆地中圖分類號:TEl22.221文獻(xiàn)標(biāo)志碼:ADiagenesisofMiddleandUpperCambrianLoushanguanGroupreservoirsinNanchuanarea,SichuanBasinJiangXiaoqiong,GuanHonglin,LiuGuangxiang2,I5Jianming3,LuoKaJping,YahJiax
4、in,YeKai,HanYu(1.FacultyofEarthScience,ChinaUniversityofGeosciences,Wuhan,Hubei430074,China;2.WuxiResearchInstituteofPetroleumGeology,SINOPEC,Wuxi,Jiangsu214126,China;3.CollegeofGeosciences,YangtzeUniversity,Wuhan,Hubei430100,China)Abstract:TheMiddle
5、andUpperCambrianLoushanguanGroupreservoirsintheNanchuanareaoftheSichuanBasinmainlyconsistofplatformmarginshoalsediments.Themainlithologyisdolomite.Themaindiagenesiseffectsincludedolomitization,solution,structuraldisruption,consolidatedfill,compaction
6、andpressuresolution,amongwhich,thefirstthreeoftheseworkasthekeyeffectsforreservoirformation.Accordingtodolomitetypes,orderdegreeandC,Oisotopeanalyses,thedolomitesinthestudyareadevelopedfromthreediagenesiseffects,includingpenecontemporaneousdolomitiza
7、tion,mixingwaterdolomitizationandburialdolomitization,amongwhichthepenecontemporaneousdolomitizationisdominant.TheLoushanguanreservoirshaveexperiencedthreeperiodsofdissolution,includingthecorrosionactionofatmosphericfreshwater,thedeepburialsolutionan
8、dthehypergenedissolution,amongwhichthehypergenedissolutionisthemaincontrollingfactor.Dolomitizationandhypergenedissolutioncontributetohigh—qualityreservoirformationintheMiddleandUpperCambrianLoushanguanGroup.Cementationandfillingeffectsdestroyalargen