The Zohr Biogenic Gas Discovery: an Initial Assessment of Controlling Factors in the Petroleum System

M. Neumaier, A. Bartha, B. Wygrala
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Abstract

Summary The deepwater biogenic gas discoveries in the Eastern Mediterranean have unique characteristics, especially due to the Messinian Salinity Crisis (MSC) between 5.96 and 5.33 Ma during which most of the Mediterranean and connected basins lost all or most of their water coverage. This resulted in geologically rapid changes in depositional environments and in the surface and subsurface conditions. The role of the MSC in the formation and preservation of hydrocarbon accumulations in the area is an ongoing discussion. What are the relationships, if any, to the MSC? Are there features that are unique and limited to areas affected by the MSC? How does the event control the risks associated with the generation, migration, accumulation, preservation and loss of the hydrocarbons? What do we know about the charging conditions and mechanisms? Are there controlling processes that occur on very short geological time scales? We use analogues and petroleum systems modeling to investigate hypotheses related to the generation, migration and entrapment of biogenic gas fields in connection with the MSC. A conceptual 2D petroleum systems model of the Zohr discovery is constructed based on publicly available data, and used to constrain our understanding of the properties and processes in the petroleum systems.
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Zohr生物气的发现:油气系统控制因素的初步评价
东地中海深水生物气发现具有独特的特征,特别是5.96 ~ 5.33 Ma的墨西尼亚盐度危机(Messinian盐度Crisis, MSC)期间,大部分地中海及其相连盆地失去了全部或大部分的水覆盖。这导致了沉积环境以及地表和地下条件的地质快速变化。MSC在该地区油气聚集形成和保存中的作用是一个正在进行的讨论。什么关系,如果有的话,MSC?在受MSC影响的地区是否存在独特的和有限的特征?该事件如何控制与油气的生成、运移、聚集、保存和损失相关的风险?我们对充电条件和机制了解多少?是否存在在非常短的地质时间尺度上发生的控制过程?我们使用类似物和石油系统建模来研究与MSC相关的生物气田的生成、运移和圈闭相关的假设。Zohr发现的概念性二维石油系统模型是基于公开可用的数据构建的,用于限制我们对石油系统性质和过程的理解。
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