东濮凹陷下第三系层序地层及深层油气资源潜力分析

综合利用地质、地震、古生物、岩心和测井资料 ,建立了东濮凹陷下第三系层序地层格架 ,讨论了构造因素对陆相层序地层演化的控制作用 ,对该凹陷油气富集规律及深层油气资源潜力进行了分析。东濮凹陷下第三系发育两个沉积层序 ,分别属于湖盆断陷早期的“早厚晚薄”型和湖盆断陷晚期的“早薄晚厚”型两种层序地层模式。东濮凹陷深层对应于湖盆断陷早期的“早厚晚薄”型层序 ,烃源岩发育 ,生储盖配置好 ,成藏条件优越 ,油气资源潜力很大 ,但由于目的层埋藏过深 ,且油气多赋存于各类非构造隐蔽圈闭中 ,因而具有较大的勘探难度和钻探风险。

AN ANALYSIS OF PALEOGENE SEQUENCE STRATIGRAPHY AND DEEP HYDROCARBON POTENTIAL IN DONGPU SAG

By using geologic, seismic, paleontological, core and logging data, a sequence frame is established for Paleogene in Dongpu sag, the control of tectonism on the nonmarine sequence development is discussed, and the hydrocarbon accumulation pattern and its deep potential are analyzed for the sag. There are two sequences developed in Paleogene in Dongpu sag. One is the "early thick_later thin" type formed during the early lake rifting, and the other is the "early thin_later thick" type formed during the later lake rifting. The deep sediments in the sag are corresponding the sequence of "early thick_later thin" type, where a significant hydrocarbon potential may exist because of well_developed source rocks, appropriate assemblages of source, reservoir and seal and favorable accumulation conditions. The exploration, however, is more difficult and of larger drilling risk due to deep target beds and subtle non_structure traps.