准噶尔盆地红车地区克拉玛依组基准面旋回结构样式与沉积微相展布
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摘要
在大量测井、钻井、地震、分析化验等资料综合分析的基础上,对红车地区三叠系克拉玛依组展开高分辨率层序地层划分与对比,探求更小级别旋回内沉积相构成与演化特征,进而了解储层分布演化规律,为岩性圈闭的预测与评价奠定基础。结果表明:红车地区克拉玛依组发育2个长期基准面旋回、8个中期旋回和24个短期基准面旋回;基准面上升初期,以河道砂体广泛分布为主要特征,砂岩含量相对较高,岩性圈闭形成条件相对不利;随着基准面上升,可容纳空的增大,泥质的泛滥平原沉积物占据其主要空间,故在基准面上升时期,更有利于岩性圈闭的形成;而伴随着基准面下降,河流能量不断增强,河道发育规模随之加大;MSC2中期基准面旋回,发育于长期旋回的中部,此时基准面位置相对较高,处于上升中-晚期,河道砂体欠发育,泛滥平原广泛分布,易形成岩性圈闭。
Based on cores,log and well-log data,evolution of all levels base-level cycles and high-resolution sequence stratigraphic model were analyzed in Hong Che area of Karamay formation.The results show that two longterm,eight middle-term and twenty four short-term basal-level cycles were classified.Early stage of basal-level ascend,it's principal feature was wide range of channel sand,conten of sandstone relatively high,formation conditions of lithologic trap were relatively disadvantage,along with basal-level ascend,accommodation broaden,Muddy sediments of the flood plain to occupy the main space,therefore,in the ascend stage of the basal-level,it's more favor of build-up lithologic trap.Accompany with descent of basal-level,stream energy continuously intensify,channel scale became widen.Msc2 middle-term basal-level cycle,developed in the middle of long-term cycle,basal-level relatively high,in the ascended stage,lacking of channel sand,wide range of flood plain,easily developed lithologic trap.
引文
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