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利用高分辨率层序地层学的原理及方法,在大量的钻测井及地震资料的基础上建立了松辽盆地大庆长垣北部喇萨杏地区PI油层等时地层格架,将浅水三角洲沉积理论的进展应用到砂体分散体系的研究中,探讨了研究区内砂体分散样式与浅水三角洲成因间的相关性。结果表明研究区储集砂体分为河道砂体、河口坝砂体、席状砂体及远砂坝砂体,在平面展布形态上具有分带性。此外,研究认为短期湖岸线的迁移幅度是控制内前缘砂体展布样式的重要因素,当湖岸线迁移幅度较大时,内前缘砂体被强烈席状砂化,在垂直物源方向表现为连续性较好的薄层状砂体;当湖岸线迁移幅度较小时,内前缘砂体以坨状产出,在垂直物源方向表现为连续性较差的厚层状砂体。
Using the principle and method of high-resolution sequence stratigraphy, an isochronal stratigraphic framework of PI reservoir in the northern Lhasa apricot area of Daqingyuange, Songliao Basin, is established on the basis of a large number of drilling, logging and seismic data. The shallow delta reservoir The progress of the theory is applied to the study of sand body dispersion system, and the correlation between the sand body dispersion pattern and the genesis of shallow water delta in the study area is discussed. The results show that the reservoir sand bodies in the study area are divided into channel sand bodies, estuary bar sand bodies, sand bodies and sand bodies far sand bar, showing zonation on the plane distribution patterns. In addition, the study suggests that the migration amplitude of short-term lakeshore line is an important factor controlling the distribution pattern of the inner front sand body. When the migration of the lakeshore line is large, The results show that the sand body of the inner front has a lump-like shape when the migration of the shoreline is small, and the thick sand body with poor continuity in the vertical direction of the provenance.