PETROLEUM GEOLOGY OF THE CRETACEOUS IN THE NORTHERN DEPRESSION OF SOUTH YELLOW SEA BASIN: EVIDENCE FROM SEISMIC ATTRIBUTE ANALYSIS
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摘要: 以多道反射地震剖面和钻井资料为基础,采用合成地震记录和地震属性分析的方法,开展南黄海盆地北部坳陷白垩系地层沉积及油气地质特征的研究。研究结果表明,白垩系地层在坳陷内保存较完整,厚度较稳定,斜坡部位变形微弱,连续性好,坳陷沉积中心变形强烈,小断层发育、密集,连续性较差,各层组厚度变化不大,可在全坳陷追踪对比。泰州组为良好的烃源岩,赤山组下部和浦口组为良好的储集层,泰州组和赤山组上部构成区域性盖层。白垩系内部及上、下地层之间形成了多类型的油气生-储-盖组合关系。断裂构造发育的凹陷深部是油气聚集的有利场所。采用三维地震资料进一步开展本项研究工作对南黄海前新生界油气勘探具有重要意义。Abstract: To enhance our understanding in the characteristics of petroleum geology and to improve the reliability of sedimentary facies description within Cretaceous strata at the South Yellow Sea Basin,seismic attribute analysis was conducted using multi-channel 2D seismic and well data at the Northern Depression of the Basin.In this study,attribute analysis reveals that at the flank of the depression,Cretaceous strata are well preserved with a constant thickness,little deformation and good continuity.Whereas at the depocentre, a faulted zone with chaotic seismic features is highlighted using structural attributes.Such evidence implies that later tectonic events have disturbed the lateral continuity of the strata at the depocentre.These minor faults may have created pathways and assisted hydrocarbon migration,hence complicates the existing hydrocarbon accumulation system and allows interpretation of different regional source-reservoir models.
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