Neotectonic movements in the Dongpu depression and their controls on hydrocarbon accumulation in shallow reservoirs
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摘要: 通过计算地层的剥蚀厚度、断层断距,分析了古近纪以后两个最主要时期的构造运动特征,将构造演化与浅层油气藏地化指标、包裹体均一温度、同位素测年等结果相结合,分析了新构造运动对油气生成、运移路径、成藏期次及时间的控制作用。研究认为:东濮凹陷新构造运动主要发生在东营组、明化镇组沉积末,运动以垂直升降为主,伴有弱的伸展断裂;两次构造运动控制了烃源岩的二次生烃和浅层油藏的二次充注;深部生成的油气运移至浅层依次经过了NE向基底断裂、东营组砂体、新近系EW向断层,新近系油气分布主要受EW向断层控制。Abstract: The present paper deals with the neotectonic movements in the Dongpu depression from the Palaeogene onwards on the basis of the calculation of erosion thickness and fault displacement, and the controls of the neotectonic movements on the generation, accumulation, migration and timing of the hydrocarbons by means of the examination of the tectonic evolution, geochemical signatures, homogenization temperatures of the inclusions, and isotopic dating. The neotectonic movements in the Dongpu depression took place at the end of the deposition of the Dongying and Minghuazhen Formations, respectively, and were dominated by vertical movements, with slightly extensional faulting. The two phases of neotectonic movements cited above are interpreted to control the secondary hydrocarbon generation in the source rocks and the second infilling in the shallow reservoirs. The hydrocarbons generated in the deeper reservoirs migrated upwards to the shallower reservoirs via the NE-trending basement faults, Dongying Formation sandstones and Neogene EW-trending faults. The Neogene hydrocarbons are mostly constrained by the EW-trending faults.
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