鄂尔多斯盆地五蛟西地区直罗组沉积相与砂体特征

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Sedimentary Faciesand Sand Body Characteristicsof the Zhiluo Formation in the Wujiaoxi Area， Ordos Basin

ZHANG Dongge1QU Xuan1SHAO Jie1WEI Haoqi1 ZHANG Qingjun'WU Yufeng² （1.CNPC Changqing Oilfield Branch Changqing Industrial Group Co.，Ltd.， Qingyang 745100，China; 2.School of Earth Science and Resources，Chang 'an University，Xi' an 71Oo54，China）

Abstract： [Purposes]The Zhiluo Formation isan important potential oil-rich interval inthe Jurassicreservoir. To delineate the favorable accumulation area of the Zhiluo Formation sandstone reservoir in the Wujiaoxi area of the Ordos Basin，itis essentialtoclarify its sedimentary facies and sand body characteristics，thereby providing a reference for planning exploration and deployment of the Zhiluo Formation reservoir in the study area.[Methods] Based on logging geology and sedimentary petrology，this study utilized well logging， mud logging，and oil testing data to analyze the sedimentary faciesand sand body characteristics of the sandstone oil reservoir in the Zhiluo Formation of the Wujiaoxi area，and discussed their controlling effects on the reservoir.[Findings] The results indicate that the Zhiluo Formation in the Wujiaoxi area received NW-source sediments.The upper Zhi-1and Zhi-2 members are dominated by meandering river deposits，while the lower Zhi-3and Zhi-4 members are characterized by braided river deposits.From the Zhi-4 to Zhi-1 depositional stages，the sand bodies gradually became finer and smallerin scale.[Conclusions] The sandstone oil in the Zhiluo Formation of the Wujiaoxi area is jointly controlled by sedimentation，structure，and sand body distribution.The coupling of themain sand belt with microstructural highs constitutes the favorable accumulation area for the Zhiluo Formation sandstonereservoir.

Keywords： Zhiluo Formation; Jurassic reservoir; sedimentary facies; sand body distribution

0 引言

鄂尔多斯盆地侏罗系油藏已经历经80年的勘探开发历程，全盆地年产量高达 6.05×106t ，是我国常规砂岩油的重要原油产层[1-3]。（剩余4392字）