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研究碎屑沉积和碎屑岩的粒度大小和各种粒级的分布特征的方法称为粒度分析。粒度分析是判别沉积环境和水动力条件的重要物理标志,而且对碎屑岩系油气储层评价也极为重要[3]。选取适合勘探区域内储层特征的粒度分析方法,方能更好地为油田勘探以及后续的开发生产提供更准确的信息。目前,长庆油田和延长油田在研究“三低”储层(低孔、低渗、低产)的物性时,实验室粒度分析主要依靠图像粒度法和激光粒度法。本文以鄂尔多斯盆地坪桥区北部为研究区块,就上述两种检测方法在陕北斜坡中部长6油层中的适应性展开讨论。
The method of studying the particle size of clastic sediments and clastic rocks and the distribution characteristics of various grain sizes is called particle size analysis. Particle size analysis is an important physical indicator of sedimentary environment and hydrodynamic conditions, and is also very important for the evaluation of oil and gas reservoirs in clastic series [3]. Select the particle size analysis method suitable for reservoir characteristics in the exploration area, in order to better provide more accurate information for oilfield exploration and subsequent development and production. At present, Changqing Oilfield and Yanchang Oilfield are mainly engaged in image analysis and laser particle size analysis when studying physical properties such as low porosity, low permeability and low productivity in the “three low” reservoirs. In this paper, the northern part of Pingqiao District in the Ordos Basin is taken as a research area to discuss the adaptability of the above two methods in the Chang 6 reservoir in the middle part of the northern Shaanxi slope.