超深层非均质低孔砂岩储层复杂流体识别方法

打开文本图片集

Complex Fluid Identification Method for Ultra Deep Heterogeneous Low Porosity Sandstone Reservoirs

ZHAO Yuanliang1，YU Bing2*，GUO Kecai1，WANG Meiling²， SHUAI Shichen1

1.ExplorationDivision，TarimOilfield，PetroChina，Korla，Xinjiang84looo，China 2.GeologicalesearchIstitute，hinaNationalLoggingorporation，etrohina，Xi'an，ani7ina

Abstract：TheburialdepthofCretaceous BashkirchikFormationinBozi-DabeiareaofKuqa Depression，TarimBasinismore than 6000m ， and the porosity is mainly distributed between 6%～9% . At the same time， the complex pore structure， significant changes inregionalformation water mineralizationand geostressresult inlowcontrastinelectricalresistivitybetweengasand waterlayers.Thepoorphysicalpropertiesof te matrixresult inpoorapplicabilityofnonelectricalfluididentificationmethods suchas arrayacousticrock mechanics parameters and neutron-densityenvelope.Adetailed analysisofregional geological characteristics was conducted toaddress the identification problem oflowcontrast ingasand water layer resistivity inthe Bozi-Dabei Region，andthree electricalidentification methodshavebeendeveloped，including the precise establishmentof porosityresistivity intersection diagram method instress Znes，pure waterlayerresistivityinversion method，andadjacent mudstoneresistivitycomparison method.At thesametime，anonelectrical identification methodfor two-dimensional nuclear magnetic T1–T2 intersectionmap that is not affected bythe skeleton was introduced.This fluid identification method was appliedtothetrackingand interpretationofexplorationwelsintheBozi-Dabei Area，interpretationcoincidencerateinceased by 16.7% ，effectively solved the difficultyoffluid identification caused bylow contrastofgas and waterlayerresistivitydue to complex geologicalconditions intheBozi-DabeiRegion. Itprovides apowerful technical means toavoidoiland gaseservoir leakageinthestudyarea.Ithas importantapplicationandpopularizationsignificancein thedomesticultra-deeptightsandstone reservoirs such as the souther margin foreland basin ofJunggar，Xinjiang and Hetao Basin of Huabei Oilfield.

Keywords： tight sandstone reservoir; poor porosity; low contrast reservoir; 2D NMR; identification method 网络出版地址：http：//link.cnki.net/urlid/51.1718.TE.20250709.1351.006

引言

塔里木盆地库车拗陷博孜—大北地区白垩系巴什基奇克组储层埋深为 6000m 以上，孔隙度分布在 6%～9% ，属于低孔砂岩储层。（剩余17283字）