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1、西南石油大學學報(自然科學版)2014年6月第36卷第3期JournalofSouthwestPetroleumUniversity(Science&TechnologyEdition)鉗撐出熙缸V_o1.36No.3Jun.2014DO1:10.11885~.issn.1674—5086.2012.10.11.04文章編號:1674.5086(2014)03—0059.09中圖分類號:P319文獻標志碼:A銅川地區(qū)油頁巖地層電性斷面特征及勘查沫王凱,張旭,唐圣松,姜亭西安地質(zhì)礦產(chǎn)研究所,陜西西安710054摘要:為了研究電阻率測深方法
2、在油頁巖地區(qū)的適用性及分辨率,在鄂爾多斯盆地南緣銅川地區(qū)開展了電阻率測深工作。結(jié)合鉆孔錄井和見礦情況,分析了油頁巖地段兩種勘查方法獲得的電阻率斷面特征,在電性斷面上固定了油頁巖層的特定部位。油頁巖層厚度相對埋深而言屬薄層、高阻目標體,其厚度與埋深縱向比小,在獲得的電阻率測深斷面上,高阻電性的油頁巖層在電阻率測深斷面上分辨率不清晰,其層位與電阻率等值線梯度變化帶對應較好,從而間接指示了油頁巖層位置。同時,通過巖性與測井參數(shù)綜合分析,認為測深斷面上這種電阻率值隨深度的漸變特征,從電性角度描述了油頁巖層由淺湖沉積環(huán)境到半深湖環(huán)境的變遷過程,提
3、出電阻率測深方法可以達到勘查油頁巖層之目的。關鍵詞:電阻率測深;電阻率梯度帶;油頁巖;淺湖相沉積;鄂爾多斯盆地ResistivitySectionCharacteristicsandExplorationoftheOilShaleLayerinTongchuanAreaWangKai,ZhangXu,TangShengsong,JiangTingXianInstituteofGeologyandMineralResources.Xian.Shaanxi7J0054.ChinaAbstract:Inordertostudythesuita
4、bilityandresolutionofresistivitysoundingmethodinoilshaleregion,wecarriedouttheresistivitysoundinginTongchuanArea,thesouthofOrdosBasin.Combinedwithdrillingmudlogginganddiscoveryoresituation,analysisoftheoilshalesectionresistivityfeaturesbytwomethodsismade。andthespecificar
5、easofoilshalelayerintheelectricalsectionareselected.Oilshalelayerthicknessisthinandhighresistancelayerintargetbody,comparedtoburydepth.Intheobtainedelectricalsection,theresolutionofhighresistanceelectricaloilshalelayerisnotveryclear,butresistivityisolinechangeofgradientz
6、onecorrespondswelltooilshalelayerposition,indicatingtheoilshalelayerpositionindirectly.Andthroughthecomprehensiveanalysisoflithologyandloggingparameters,wethinkthegradientchangesofresistivityvalueswithdepthchangesresistivityvaluewithdepthdescribesfromelectricalaspectthee
7、volutionofoilshalelayerfromshallowlakesedimentaryenvironmenttohalfdeeplacustrineenvironment.Thereforeweconcludethatresistivitysoundingmethodcanachievethepurposeoftheexplorationofoilshalelayer.Keywords:resistivitysoundingmethod;gradientzoneofresistivityisolinechange;oilsh
8、ale;shallowlakesedimentary;OrdosBasin網(wǎng)絡出版地址:http://www.cnkimet/kcms/doi/1011885/j.issn1674-5086.2012101