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1、文章編號:0253-2697^012)03-0437-05低滲透油藏儲層分級評價方法及應(yīng)用張仲宏I楊正明2劉先貴2熊偉2王學(xué)武2(?中國地質(zhì)大學(xué)能源學(xué)院北京iooo83:2?中國石汕勘探開發(fā)研究院廊坊分院河北廊坊065007)摘要低滲透石油探明儲量逐年增加,低滲透油藏未動用儲量占未動用總儲量的比例較高。筆者在長慶、大慶外圉、吉林和華北等油區(qū)2200塊巖心分析的棊礎(chǔ)上,結(jié)合幾個低滲透油區(qū)的開發(fā)現(xiàn)狀,提出了用主流喉道半徑、可動流體百分?jǐn)?shù)、擬啟動壓力梯度、原油黏度和黏土礦物含雖作為評價參數(shù),確定了各表征參數(shù)的分類界限,對比了兒個低滲透油區(qū)儲層農(nóng)征參數(shù)數(shù)據(jù)的差異,深化了対低滲透
2、儲層的認(rèn)識,捉出了低滲透油區(qū)儲層綜合評價方法“研究表明,儲層分類系數(shù)與區(qū)塊單井產(chǎn)能有較好的相關(guān)關(guān)系。在此期礎(chǔ)上,對長慶、大慶、吉林油田3大低滲透油區(qū)進(jìn)行儲層分類評價,確定了各油區(qū)不同分類級別所對應(yīng)的滲透率范圍。該項研究將對優(yōu)選產(chǎn)能建設(shè)區(qū)塊和確定投資具有指導(dǎo)意義,并為確定下步低滲透油藏攻關(guān)目標(biāo)、技術(shù)對策及動用界限提供技術(shù)支撐。關(guān)鍵詞:低滲透油藏微觀孔隙結(jié)構(gòu);儲層分級評價;評價參數(shù);巖心分析中圖分類號:TE311文獻(xiàn)標(biāo)識碼:AAgradingevaluationmethodforlow-permeabilityreservoirsanditsapplicationZHANG
3、Zhonghong1YANGZhengming2LIUXiangui2XIONGWei2WANGXuewu2(.SchoolofEnergyResources-ChinaUniversityofGeo6cienoes?Beijing100083-China:2.LangfangBranch,PetroChinaResearchInstituteofPetroleumExploration&Development-Langfang065007,China)Abstract:Thedemonstratedreservesoflow-permeabilityreservoir
4、sinChinaincreaseyearbyyear.Thenon-producingreservesofIcw?permeabilityreservoirsamounttoarelativelyhighpercentageoftheallnon-producingreservesinChina.Basedonthegeochemi-calaralysisof2200coresamplescollectedfromtheperipheralzoneoftheDaqingoilregion,theChangqing.JilinandHuabeioilre-gionsand
5、integratedwiththecurrentsituationofseveralmajorlow-permeabilityreservoirsdevelopedbyPetroChinaCompanyLimit-ed?weproposedanumberofparameterstoevaluatelow-permeabilityreservoirs,suchastheradiusofmainflowthroat,percentageofmovablefuid?thresholdpressuregradient?viscosityofoilandcontentofclay
6、minerals.Meanwhile-theclassificationlimitofva?「iouscharacterizationparametersweredeterminedanddifferencesintheseparametersforthemainlow-permeabilityreservoirswerecompared,whichhasdeepenedourunderstandingaboutlow-permeabilityreservoirs.Thus?acomprehensiveevaluationmethodforlow-permeabilit
7、yreservoirswasproposed?Theresultshowsthatthecorrelativitybetweenreservoirclassificationcoefficientsandthedeliverabilityofasingleoilwellisguitegood?Basedonthesedata?wecarriedoutareservoirclassificationevaluationonlow?permeabilityreserversintheChangqing,DaqingandJilinoilreg