桂中坳陷泥盆系页岩气成藏条件与有利区带评价_王鹏万

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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

2、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

3、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:AShalegasaccumulationconditionsandplayevaluationoftheDevonianinGuizhongDepression111，2，341111WangPengwan，ChenZiliao，HeXunyun，DongLi，XuZhengyu，MaLiqiao，DongYongandHuangLing(1.HangzhouInstituteofPetroleumGeology，PetroChinaExplorat

4、ionandDevelopmentResearchInstitute，Hangzhou，Zhejiang310023，China;2.InstituteofGeologyandGeophysics，ChineseAcademyofSciences，Beijing100029，China;3.GraduateSchool，ChineseAcademyofSciences，Beijing100049，China;4.SINOPECExploration＆ProductionResearchInstitute，Beijing1

5、00083，China)Abstract:Asetofdarkshalesofintraplatformdepression-deepshelffacieswasdepositedinGuizhongdepres-sionduringtheDevonianwhentheGuizhongdepressionexperiencedintracontinentalrifting．Outcropobservationandintegratedanalysisofdrillingandgeochemicaldataindicate

6、thattheMiddle-LowerDevonianshaleinGuizhongdepressionfeatureinlargethickness(themaximumcumulativethicknessupto1000m)，highabun-danceoforganicmatter(TOCof0.53%～9.46%)，moderatethermalmaturity(Roof1.33%～3.62%)，well-developedmicro-pores，nono-poresandmicro-fractures，fav

7、orableclaymineralcomposition，moderateburialdepth，andrelativelygoodsealingconditions．Allthesecharacteristicsrevealitshighpotentialforshalegasex-ploration．BasedontheshalegasexplorationexperiencesofNorthAmerican，incombinationwiththepracticeofmarineshalegasexploratio

8、ninsouthChina，weputforwardevaluationcriteriaforshalegasplay．Palyevalua-tionresultswiththesecriteriashowthattheareatothewestofNandan-Xincheng-Mashanisapotential