鄂尔多斯盆地大牛地气田下石盒子组一段沉积相分析

发布时间：2018-04-25 22:42

本文选题：沉积相 + 辫状河三角洲　；参考：《东北石油大学学报》2017年02期

【摘要】：为认识鄂尔多斯盆地大牛地气田下石盒子组沉积相特征及其演化规律,采用岩心、录井和测井等资料,分析地层岩石组合、沉积构造和测井相组合,确定下石盒子组一段(盒一段)岩性组合及展布特征;在小层平面展布基础上,根据区域构造和沉积演化背景,分析下石盒子组的物源供给和水动力变化,确定盒一段沉积微相纵向演化规律。结果表明:盒一段沉积物以灰白、浅灰色含砾粗砂岩、砂砾岩,灰色、浅绿色细砂岩,灰色、棕色泥岩为主,剖面上各小层呈下砂上泥的正韵律组合特征,平面上砂岩呈近SN向条带状展布。盒一段沉积一套以粗碎屑岩为主的、砂泥组合的湖泊—辫状河三角洲沉积体系,盒一段水下辫状河道为有利储集相带,辫状河道较发育,平面上摆动、迁移频繁。盒1-1和盒1-2亚段比盒1-3亚段分流河道砂体厚度更大,连续性更好。该研究结果为大牛地气田下石盒子组沉积相分析、高效砂体预测及勘探方向部署提供参考。
[Abstract]:In order to understand the sedimentary facies characteristics and evolution rules of Xiashihezi formation in Daniudi gas field in Ordos Basin, the formation rock assemblage, sedimentary structure and logging facies combination are analyzed by using core, logging and logging data. The lithologic assemblage and distribution characteristics of the first member of the Xiashihezi formation are determined, and the source supply and hydrodynamic changes of the Lower Shihezi formation are analyzed according to the regional tectonic and sedimentary evolution background on the basis of the distribution of the sublayer plane. The longitudinal evolution law of sedimentary microfacies in the first member of the box is determined. The results show that the sediments in the first section are gray-white, grayish gravelly coarse sandstone, sandy gravel, gray, light green fine sandstone, gray mudstone and brown mudstone. The sandstone is distributed in near SN direction on the plane. A set of lacustry-braided river delta sedimentary system with coarse clastic rocks and sand and mud assemblage is deposited in the first member of the basin. The underwater braided channel in the first section is favorable reservoir facies zone, the braided channel is relatively developed, the plane is swinging and the migration is frequent. The thickness and continuity of distributary channel sand bodies in box 1-1 and box 1-2 are larger than those in box 1-3. The results provide a reference for the analysis of sedimentary facies of Xiashihezi formation in Daniudi gas field, the prediction of high efficiency sand bodies and the direction of exploration.
【作者单位】：中国石化勘探开发研究院;中国石油化工股份有限公司华北石油局;密苏里科技大学;
【基金】：中国石化油田部开发先导项目(G5800-08-ZS-YTB029)
【分类号】：P618.13

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