陆丰凹陷T_5地震反射层特征及其油气勘探意义
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摘要
陆丰凹陷T5反射层整体上为3个正向和2个负向同相轴组成的(较)强反射波组,其中部为正向轴,即本次研究追踪的T5反射轴连续、分布广、最稳定,在深洼区为下超终止面,向岸或古地貌高地为上超面,是最好的区域对比和地震追踪标志层。T5反射层整体对应3个岩性层段,其中部岩性段为灰岩或与之可对比的灰岩与砂泥岩的互层,陆丰凹陷北西部则均为砂泥岩,并对应T5反射轴,年龄18.5Ma,为三级层序TB2.1最大洪泛期前后的沉积,是南海运动以来海水整体变深背景下,陆丰凹陷首次由滨海过渡到浅海陆架的一次明显海侵期沉积。中部岩性段之上常为一套砂岩层及再向上的泥岩发育段,为TB2.1下降体系域和另一期海侵沉积;中部岩性段之下邻接的砂泥岩互层层段为TB2.1内的一个四级层序。T5反射层对应灰岩与其上下不同级别层序界面附近储盖组合有利;层序的旋回变化及继承性发育的地貌高地是该层段油气有利勘探区带平面展布的主控因素。
The composite seismic wave of the reflection horizon T5 includes three positive and two negative high-amplitude events.The middle positive one is the seismic event of T5 interpreted in this study;it is the best stratigraphic correlation marker and seismic interpretation horizon because of its stability,continuity,and extensive distribution;it is a surface of downlap termination in the deep-sag area and a surface of onlap termination in the alongshore and high-landform area.Corresponding to T5,the middle stratum is composed of limestone,and limestone interbedded with sandstone or mudstone;and it is only composed of sandy mudstone in the northwest of Lufeng Sag.It was formed in the first transgression stage of sedimentation during the transition of the Lufeng Sag from a shore zone to a neritic shelf under the long transgression background after the Nanhai movement,with the age of 18.5 Ma and formed around the maximum flood stage of third-order sequence TB2.1.Above the middle stratum,a set of sandstone strata lies locally,formed as the falling system tract of TB2.1 and another stage of transgression sedimentation.Under the middle stratum,an interbedded stratum of sandstone and mudstone lies as a fourth-order sequence of TB2.1.Assemblages of petroleum reservoir and seal rock developed in and about the reflection horizon T5,which was controlled mainly by the sequence cyclicity and successive landform.
引文
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