桂中坳陷泥盆系页岩气成藏条件与有利区带评价_王鹏万.pdf

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1、第33卷第3期OIL＆GASGEOLOGY2012年6月文章编号:0253－9985(2012)03－353－11桂中坳陷泥盆系页岩气成藏条件与有利区带评价111，2，341111王鹏万，陈子炓，贺训云，董立，徐政语，马立桥，董庸，黄羚(1.中国石油杭州地质研究院，浙江杭州310023;2.中国科学院地质与地球物理研究所，北京100029;3.中国科学院研究生院，北京100049;4.中国石化石油勘探开发研究院，北京100083)摘要:桂中坳陷泥盆系经历陆内裂陷演化阶段，沉积了一套台盆－深水陆棚相黑色泥页岩。通过野外典型露头、钻井及地球化学分析等资料，认为桂中坳陷中下泥盆统泥页

2、岩具备形成页岩气的资源基础和优越的成藏条件，其泥页岩厚度大(最大累计厚度可达1000m)、有机质丰度高(有机碳含量为0.53%～9.46%)、热演化程度适中(镜质体反射率为1.33%～3.62%)、储层微孔隙－纳米孔及微裂缝发育、粘土矿物成分好、埋深适宜及保存条件相对较好，勘探潜力较大。借鉴北美页岩气勘探开发经验，结合中国南方海相页岩气勘探实际，优选现阶段有利区评价相关指标，认为南丹—忻城—马山一线以西地区为桂中坳陷泥盆系页岩气勘探的有利区带。关键词:成藏条件;有利区带;泥盆系;页岩气;桂中坳陷中图分类号:TE122．1文献标识码:AShalegasaccumulationco

3、nditionsandplayevaluationoftheDevonianinGuizhongDepression111，2，341111WangPengwan，ChenZiliao，HeXunyun，DongLi，XuZhengyu，MaLiqiao，DongYongandHuangLing(1.HangzhouInstituteofPetroleumGeology，PetroChinaExplorationandDevelopmentResearchInstitute，Hangzhou，Zhejiang310023，China;2.InstituteofGeologyan

4、dGeophysics，ChineseAcademyofSciences，Beijing100029，China;3.GraduateSchool，ChineseAcademyofSciences，Beijing100049，China;4.SINOPECExploration＆ProductionResearchInstitute，Beijing100083，China)Abstract:Asetofdarkshalesofintraplatformdepression-deepshelffacieswasdepositedinGuizhongdepres-siondurin

5、gtheDevonianwhentheGuizhongdepressionexperiencedintracontinentalrifting．OutcropobservationandintegratedanalysisofdrillingandgeochemicaldataindicatethattheMiddle-LowerDevonianshaleinGuizhongdepressionfeatureinlargethickness(themaximumcumulativethicknessupto1000m)，highabun-danceoforganicmatter

6、(TOCof0.53%～9.46%)，moderatethermalmaturity(Roof1.33%～3.62%)，well-developedmicro-pores，nono-poresandmicro-fractures，favorableclaymineralcomposition，moderateburialdepth，andrelativelygoodsealingconditions．Allthesecharacteristicsrevealitshighpotentialforshalegasex-ploration．Basedontheshalegasexp

7、lorationexperiencesofNorthAmerican，incombinationwiththepracticeofmarineshalegasexplorationinsouthChina，weputforwardevaluationcriteriaforshalegasplay．Palyevalua-tionresultswiththesecriteriashowthattheareatothewestofNandan-Xincheng-Mashanisapotential