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大港油田探区在奥陶世时期为华北陆表海的一部分,早奥陶世的岩相古地理具有南北分区的特点,中奥陶世受盆地基底结构控制,为“海中有坪”的格局。奥陶系储集层由于盆地后期的多次改造,受多种因素制约,其主要特点为:岩潮顷层分布;储集层高孔、低渗,总体上属较好—差储集岩。其中沈青庄—塘沽、孔西、王官屯、南皮—吴桥和徐黑等地区为较好储集岩分布区。
The Dagang oilfield exploration area during the Ordovician period was part of the land surface sea in North China. The lithofacies and paleogeography of the Early Ordovician had the characteristics of a north-south division. The Central Ordovician was controlled by the basement structure of the basin, and was the pattern of “a flat in the sea”. Ordovician reservoirs are subject to many factors due to multiple reconstruction in the late stage of the basin. The main features of the Ordovician reservoir are as follows: distribution of rocks and tidal layers; high porosity and low permeability of reservoirs, generally good - poor reservoir rocks . Among them, Shen Qingzhuang-Tanggu, Kongxi, Wangguantun, Nanpi-Wuqiao and Xuhei are the better reservoir rock distribution areas.