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依据基准面旋回原理和方法,综合利用哈得逊地区的钻井、测井、地震以及地球化学资料,在研究区下石炭统识别出1个Ⅰ型和3个Ⅱ型层序界面,将哈得逊地区下石炭统划分为3个中期基准面旋回:SC_1、SC_2、SC_3,对应于早石炭世海侵的3个海进-海退旋回。SC_1旋回以滨岸砂坝沉积为主,而SC_2、SC_3旋回发育潮坪沉积体系。研究认为,SC_1旋回滨岸砂岩及SC_2下降半旋回的潮间带薄层砂岩为有利储集砂体,是地层-岩性型油气藏的重点勘探目标。
Based on the principle and method of the reference plane cycle, comprehensively utilizing the drilling, logging, seismic and geochemical data in the Hudson region, 1 type I and 3 type II sequence boundaries were identified in the Lower Carboniferous of the study area, The Lower Carboniferous system is divided into three medium-term base-level cycles: SC_1, SC_2 and SC_3, corresponding to the three transgressions of the Early Carboniferous sea-regressive subsidence. The SC_1 cycle is dominated by the coastal sand bar deposition, while the SC_2 and SC_3 cycles develop the tidal flat sedimentary system. The study shows that the SC_1 gyration coastal sandstone and the SC_2 descending half-cycle intertidal thin sandstone are favorable reservoirs, which are the key exploration targets of the stratigraphic-lithologic reservoirs.