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大小:1.15 MB
页数:6页
时间:2019-05-13
《川东北元坝区块中下侏罗统页岩油气地质分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第35卷第6期石油褒劈沾届Vo1.35,No.62013年11月PETRoLEUMGEoLoGY&EXPEIMIENTNOV..2013文章编号:1001—6112(2013)06-0596-05doi:10.11781/sysydz201306596川东北元坝区块中下侏罗统页岩油气地质分析周德华,焦方正,郭旭升,郭彤楼,魏志红(1.中国石化油田勘探开发事业部,北京100728;2.中国石化勘探南方分公司,成都610041)摘要:结合钻井、岩心、野外露头、测井等成果,从富含有机质页岩空间展布、地化特征、岩石矿物学、储集空间特征、孑L渗性特征和地质力学性
2、质等方面,对川东北元坝区块中下侏罗统页岩油气地质特征进行了综合研究。显著地质特征是:富有机质泥页岩主要发育于自流井组大安寨段和千佛崖组千一一二段,为浅湖一半深湖沉积,黑色泥页岩夹灰岩或砂岩。有机质较为发育.有机碳含量平均为1.14%,有机质类型以Ⅱ2型为主,镜质体反射率(尺。)介于1.4%~1.6%之间,均处于凝析油一湿气的成熟一高成熟阶段。总体上,中下侏罗统页岩气构造简单、稳定,断裂不发育,保存条件良好,有利于烃类形成。大安寨段湖相页岩油气总体与北美EagleFord页岩气特征相似。大安寨段暗色泥页岩厚4O~l15m,孔隙类型丰富.发育水平缝和微裂缝
3、。脆性矿物含量平均为52.7%,杨氏模量平均为37GPa,泊松比平均为0.30,有利于压裂形成网络裂缝。关键词:有机质;页岩油气;储集层;中下侏罗统;元坝地区;JII东北中图分类号:TEl22.1文献标识码:AGeologicanalysisofMiddle——LowerJurassicshalereservoirsinYuanbaarea,northeasternSichuanBasinZhouDehua,JiaoFangzheng,GuoXusheng,GuoTonglou,WeiZhihong(1.OilfieldE&PDepartment,SI
4、NOPEC,Beijing100728,China;2.SINOPECExplorationSouthernCompany,Chengdu,Sichuan610041,China)Abstract:Integratingwithdrillings,cores,outcropsandloggingdata,wemadeacomprehensivegeologicanaly-sisoftheMiddle-LowerJurassicshalereservoirsintheYuanbaareaofthenortheasternSichuanBasin。from
5、theaspectssuchasorganic—richshaledistribution,geochemicalcharacterization,mineralcomposition,hydrocarbonstorespaceproperty,shaleporosityandpermeabilitycondition.andgeomeehanicalnature.Theorganic—richshalesmainlygeneratedfromtheDaanzhaimemberoftheZiliujingFormationtothelstand2ndm
6、embersoftheQianfoyaFormation.Theyareshallowtosemi.deeplacustfinefacies.andmainlyconsistofdarkshaleswithlimesandsandstones.Organicmattersarerich.andoftypeI1..TheaverageTOCcontentis1.14%.Thevitrinitereflectance(R。)rangesfrom1.4%to1.6%,indicatingforthematureandhigh—maturestagesofco
7、ndensateoilandwetgas.Generally,theMiddle—LowerJurassicshaleshavesimpleandstablestructurewithfewfracturesdeveloped.hencearefavorableforhydrocarbongenerationandpreservation.ThelacustrinefaciesshalesintheDaanzhaimemberaresimilartotheEagleFordshalesintheNorthAmericaingenera1.Thedark
8、shalesintheDaanzhaimemberare40—115mthickwithvar
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