中文摘要：

北黄海东部坳陷为中、新生代发育的陆内断陷盆地,总体为NE向,晚白垩世时期为湖盆沉积,主要发育扇三角洲相.由于盆地面积小,物源搬运有限,岩性混杂,储层纵向和横向非均质性强,且储层厚度较薄.受地震资料自身频率的限制,利用叠后波阻抗反演方法难以识别薄储层,而谱分解技术是寻找薄砂体储层最为有利的手段.本文在分析井点处下白垩统薄砂体地震响应的基础上,通过拓频处理使高频段能够区分薄储层,然后用S变换对地震资料进行频谱分解,最后对薄砂体储层进行分频解释.结果表明,早白垩世早期的物源位于研究区的西北边,从西北到东南,湖相的水体加深,从扇三角洲平原亚相逐渐过渡到扇三角洲前缘亚相,扇三角洲平原亚相为砂体分布较多的区域,虽为低孔特低渗储层,但由相邻井和时频分析的烃类结果来看,下白垩统砂岩为储集层圈闭的有利区域.

英文摘要：

The eastern depression of North Yellow Sea Basin is a intracontinental rift basin from Mesozoic to Cenozoic period,construction direction is towards NE,with lacustrine sedimentary in early cretaceous period,mainly developed fan delta facies. Due to the small area basin,source is mixed,litho is strong heterogeneity in longitudinal and lateral,and the reservoir thickness is thin.Restricted by its own frequency in seismic data,seismic impedance inversion method is difficulty to identify thin reservoir,while the spectral decomposition technique is the most favorable method,In this paper,by analyzing thin sand body of lower cretaceous strata in the well location,which have no response on the seismic,then through the high frequency after seismic frequency-broadening which can distinguish the characteristics of the thin reservoir,then exploits S transform for 3D seismic data spectral decomposition,and conduct frequency division interpretation. The results show that early cretaceous source is located in the northwest of target area,water becomes deeper form northwest to southeast,from fan delta plain to fan delta front facies,where fan delta plain is widely covered sand body. Though sand body is low porosity and low permeability,as the favorable area for reservoir traps,the exploration prospect is promising,in combination with adjacent drilling well in this are and time-frequency analysis of hydrocarbon detection.