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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.
The eastern North Yellow Sea depression is an intracontinental rift basin developed in the Mesozoic and Cenozoic and generally NE-trending. In the Late Cretaceous, it was a lake basin mainly with fan-delta facies. Due to the small area of the basin and the limited handling of provenance, lithology Mixed, vertical and horizontal reservoir anisotropy strong, and the reservoir thickness is thin.Founded by the seismic data of their own frequency, the use of post-stack wave impedance inversion method is difficult to identify thin reservoir, and spectral decomposition technology is to find thin sand Which is the most favorable method for reservoirs.Based on the analysis of the seismic response of the Lower Cretaceous thin sand body at the well point, the high frequency band can be distinguished from the thin reservoir by the frequency-broadening process, and then the S-transform is used to decompose the seismic data, The result shows that the source of Early Early Cretaceous is located in the northwestern edge of the study area, and from the northwest to the southeast, the water bodies in the lacustrine phase deepen, and the sub-facies gradually transition from fan delta to fan The delta front and fan delta subfacies are mostly sandbody distribution areas. Although these are low porosity and low permeability reservoirs, according to the hydrocarbon results of adjacent wells and time-frequency analysis, the Lower Cretaceous sandstone A favorable area for reservoir traps.