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延长组长6-2是鄂尔多斯盆地西南缘镇泾油田的一个重要勘探层位.通过岩心观察、测井资料、薄片研究、粒度分析,对镇泾油田长6-2沉积微相进行了深入研究.认为该区长6-2由一个完整的中期基准面旋回组成,水下分流河道主要发育在中期基准面缓慢上升初期和快速下降阶段,由于水下分流河道的强烈侵蚀作用,河口坝砂体不发育.中期基准面缓慢上升初期的河道具有深而窄的特点,砂体横向变化快,勘探难度大,而与之相对的是中期基准面快速下降阶段,水下分流河道具有厚而广的特点,为本区最为有利的勘探目的层.通过对不同可容空间下水下分流河道砂体厚度与河道宽度的研究,发现其具有很好的相关性,得出该区的砂体厚度与河道宽度的经验公式,为下一步勘探开发提供了强有力的理论依据.
Yanchang Formation 6-2 is an important exploration horizon in Zhenjing Oil Field, southwestern margin of Ordos Basin. The sedimentary microfacies of Chang 6-2 in Zhenjing Oilfield are studied in depth by core observation, well logging data, sheet study and grain size analysis .It is believed that the mayor 6-2 consists of a complete mid-term base-level cycle. The underwater distributary channel mainly develops at the initial stage of rapid rise and rapid descent of the medium-term base level. Due to the intense erosion of the underwater distributary channel, Not developed.The mid-term slow rise of the initial river channel has a deep and narrow features, the rapid changes in the sand body horizontal, exploration is difficult, while the opposite is the mid-level rapid decline in stages, underwater distributary channel with a thick and wide Which is the most favorable exploration target zone in this area.Through the study on the thickness and width of underwater distributary channel sand body under different allowable space, it is found that there is a good correlation between the sand body thickness and the river channel The empirical formula of width provides a strong theoretical basis for the next exploration and development.