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1、第36卷第3期石油鉆采工藝Vo1.36No.32014年5月OILDRILUNG&PR0DUCTIONTECHNOL0CYMav2014文章編號(hào):1000—7393(2014)03—0068—04doi:10.13639/j.odpt.2014.03.017頁(yè)巖儲(chǔ)層微觀破裂特征實(shí)驗(yàn)研究趙志紅郭建春楊經(jīng)棟王杏尊鮑文輝(1.西南石油大學(xué)油氣藏地質(zhì)及開(kāi)發(fā)工程國(guó)家重點(diǎn)實(shí)驗(yàn)室,四川成都610500;2.華北油田勘探開(kāi)發(fā)研究院,河北任丘0625523.中海油田服務(wù)股份有限公司油田生產(chǎn)事業(yè)部,天津塘沽300450)引用格式:趙志紅,郭建春,楊經(jīng)棟,等.頁(yè)巖儲(chǔ)層微觀破裂特征實(shí)驗(yàn)研究[J].石油鉆采工藝,2
2、014,36(3):68.71.摘要:形成復(fù)雜網(wǎng)狀裂縫溝通更大的儲(chǔ)層體積是頁(yè)巖儲(chǔ)層改造的關(guān)鍵,但在微觀上,頁(yè)巖儲(chǔ)層破裂面的特征影響自支撐裂縫的導(dǎo)流能力,破裂時(shí)在破裂面上產(chǎn)生的微裂縫影響頁(yè)巖氣的滲透性,這些對(duì)頁(yè)巖儲(chǔ)層的改造同樣重要。利用四川盆地和濟(jì)陽(yáng)凹陷頁(yè)巖巖樣首先進(jìn)行礦物組成和破裂實(shí)驗(yàn)后,利用3D激光掃描儀對(duì)一組巖樣的破裂面進(jìn)行掃描,分析破裂面的平整程度;利用掃描電子顯微鏡對(duì)兩組巖樣的破裂面進(jìn)行不同倍比掃描,分析破裂面的微觀形態(tài)特征。實(shí)驗(yàn)結(jié)果發(fā)現(xiàn):方解石含量越高,破裂面等高線分布規(guī)律性越強(qiáng),且越易在破裂面形成微裂縫;黏土含量越少,方解石和石英含量越高,越易發(fā)生剪切斷裂。研究成果對(duì)認(rèn)識(shí)頁(yè)巖儲(chǔ)
3、層的破裂特征以及指導(dǎo)壓裂方案設(shè)計(jì)具有一定的意義。關(guān)鍵詞:頁(yè)巖;壓裂;破裂面;礦物,微觀特征;微裂縫中圖分類(lèi)號(hào):TU458文獻(xiàn)標(biāo)識(shí)碼:AExperimentalstudyofmicroscopicfracturecharacteristicsofshalereservoirsZHA0Zhihong,GU0Jianchun,YANGJingd0ng,WANGXingzun,BA0Wenhui(1StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,SouthwestPetroleumUniversity,Chengdu,Sic
4、huan610500,China;2.HuabeiOieldExplorationandDevelopmentResearchInstitute,Renqiu,Hebei062552,China;3.OilfieldProductionDivision,ChinaOi~eMServicesCo,LTD.,Tanggu,77anjin300450China)Abstract:Forshalereservoirreformitiscriticaltoconnectalargerreservoirvolumebydevelopingcomplexfracturenetwork.Microscop
5、ically,however,thecharacteristicsoffractureplaneinshalereservoirafecttheconductivityofself-proppingfractures,andthemicrofracturesformedonthefractureplaneafectthepermeabilityofshalegas.Theseaspectsareequallyimpo~antforshaleres—ervoirstimulation.Inthispaper,themineralcompositionandfracturetestiscond
6、uctedfirstlyforaseriesofshalesamplestakenfromtheSichuanBasinandJiyangDepression,andthena3Dlaserscannerisusedtoscanthefractureplanesinagroupofsamples,SOastoanalyzetheflatnessofsuchplanes.Next,ascanningelectronmicroscopeisusedtoscanthefractureplanesintwogroupsofsamplesatdiferentmultiplierstoanalyzet
7、hemicroscopiccharacteristicsofthefracturesurfaces.Theresultsshowthat,higherthecalcitecontent,strongerthefractureplanes’regularityOilthecontourchart,andmoreeasilytheformationofmicrofracturesinthefractureplane;shea