CONNECTIVITY OF THE JURASSIC SKELETAL SAND BODIES IN THE WEST OF CHEPAIZI UPLIFT, JUNGGAR BASIN
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摘要: 骨架砂体作为油气输导体系的重要组成要素，控制着油气在空间上侧向的运移以及分布，其有效连通常受到砂体内部断层发育以及砂体微观非均质性的影响.通过对准噶尔盆地车排子凸起西翼地区主要井位进行单井分析，在明确区域地层格架与沉积相的基础上，划分侏罗系头屯河组及八道湾组各段的骨架砂体；并在此基础上绘制骨架砂体连井剖面图以及平面分布等值线图，对研究区骨架砂体的宏观连通性进行研究；再进一步通过对各层位的砂体系统取样，进行孔渗性分析，定性描述其微观连通情况；运用地质统计学方法，对骨架砂体微观连通性进行定量评价.结果表明，从剖面、平面、微观3个方面针对侏罗系头屯河组和八道湾组骨架砂体进行综合评价，研究区骨架砂体连通性相对较好的组段为侏罗系头屯河组三段及八道湾组三段.Abstract: As an important component of the oil and gas transporting system, skeletal sand body controls the lateral migration and distribution of oil and gas in space. The effective connection is usually affected by the development of faults in the sand bodies as well as the microscopic heterogeneity of the sand bodies. By single well analysis for the main wells in the western area of the Chepaizi uplift in Junggar Basin, on the basis of regional stratigraphic framework and sedimentary facies, the Jurassic skeletal sand bodies are identified. With drawing of connection-well sections and planar distribution contour maps of skeletal sand bodies, the macro connectivity of the skeletal sand bodies is analyzing. Based on the connectivity research of porosity and permeability, with systematic sampling from sand bodies of each layer, the microscopic connectivity is qualitatively described. With geological statistics, the microscopic connectivity is quantitatively evaluated. Therefore, the skeletal sand bodies of Jurassic Toutunhe Formation and Badaowan Formation are comprehensively evaluated from three aspects, i.e. profile, plane and microcosmic view. The results indicate that the connectivity of skeletal sand bodies in the strata of J2t3 and J1b3 is relatively well.
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Key words:
- Jurassic /
- skeletal sand body /
- sand connection /
- Chepaizi uplift /
- Junggar Basin
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