据《今日石油网》2021年7月12日报道，挪威著名能源研究和商业情报公司雷斯塔能源公司（Rystad）在其最新的一份报告中称，全球油气公司正日益将勘探和生产活动范围缩小到更少的地区和远景区，以确保在本世纪末石油需求开始下降时，投资最有利可图的原油。
这家总部位于挪威奥斯陆的能源咨询公司表示：“在这一过程中，分析地下资料至关重要，以便了解哪些远景区、国家和盆地在油藏产能方面提供最佳机会。”最近，Rystad在上游解决方案中推出了储层和油源岩参数，以帮助客户在全球范围内评估和确定油气远景区。
包括二叠纪、泥盆纪、三叠纪和石炭纪在内的较老远景区至今已向人类共贡献了大约2470亿桶油当量的石油和天然气。
到目前为止，圭亚那海域已获得大约23个新石油发现，其中20个石油发现是在埃克森美孚公司担任作业者的斯塔布鲁克区块内获得的。地质专家认为，圭亚那盆地是最令人兴奋的勘探热点，美国石油巨头率先展示了圭亚那盆地出色的勘探前景。
《今日石油网》日前从伍德麦肯兹的一份报告中看到，专家们将圭亚那盆地描述为一个发育良好的半地堑，其主要油源岩是世界级的坎赫组，属于森诺曼家阶-土伦阶年代。
伍德麦肯兹的官员说，这相当于在哥伦比亚和特立尼达等世界上最令人羡慕的油气国发现的油源层。 《今日石油网》了解到圭亚那盆地的油源岩非常成熟，已知运移距离超过200公里。
迄今为止，圭亚那盆地已形成3个远景区。伍德麦肯兹专家指出，埃克森美孚公司在斯塔布鲁克区块的大多数发现都是在晚白垩纪，地层圈闭中的浊积砂岩储层，并补充说储层质量优良，具有多重达西渗透率。 例如，丽莎-3评价井被深钻到早白垩纪砂岩中，从而获得了丽莎深层发现。
《今日石油网》了解到，在丽莎油田群西北方100公里处的Ranger发现开启了白垩纪碳酸盐岩沉积，并带有第三纪碎屑盖层。 它被描述为具有四通闭合的大型构造圈闭。
韦斯特伍德能源集团表示，在过去十年中，在晚白垩纪地层圈闭中发现的石油和天然气比其他任何圈闭类型都要多，而圭亚那-苏里南盆地迄今仍然是最多产的圈闭之一。
李峻 编译自 今日石油
原文如下：
Cretaceous plays continue to dominate global hydrocarbon output
Global oil and gas companies are increasingly narrowing their exploration and production activities to fewer regions and plays to make sure they are invested in the most profitable barrels when oil demand starts to decline later this decade, Rystad Energy said in a recent update.
“Analyzing subsurface information is crucial in this process to understand which plays, countries and basins provide the best opportunities in terms of reservoir productivity,” the Norway-based consultancy group said. It recently launched reservoir and source rock parameters in its upstream solutions to help clients evaluate and benchmark plays on a global scale.
“Most of the volumes produced between 2000 and 2020 are of the Cretaceous period, delivering about 341 billion barrels of oil equivalent in total,” Rystad Energy said. “Jurassic plays come in second with about 189 billion boe, while the youngest plays of Neogene and Paleogene follow with 155 billion and 106 billion boe, respectively.”
Older plays including Permian, Devonian, Triassic and Carboniferous together contributed around 247 billion boe.
With around 23 discoveries to date offshore Guyana, 20 of which were made at the ExxonMobil-operated Stabroek block, geological experts posit that the Guyana basin stands as the most exciting exploration hotspot, with the U.S. oil major leading the way in showcasing the basin’s outstanding prospectivity.
In a report seen by OilNOW from Wood Mackenzie, the experts described the basin as being a well-developed half-graben whose principal source rock is the world-class Canje formation which is of Cenomanian to Turonian age.
WoodMac officials said this is equivalent to source beds found in some of the world’s most envied hydrocarbon provinces like Colombia and Trinidad. OilNOW understands that the Guyana basin source rock is very mature, and migration is known to have occurred over distances greater than 200 kilometres.
Thus far, three plays have been established in the basin. WoodMac experts noted that most discoveries by ExxonMobil in the Stabroek Block have been made in Late Cretaceous, turbidite sandstone reservoirs in stratigraphic traps while adding that reservoir quality is understood to be excellent, with multi-Darcy permeability. The Liza-3 appraisal well, for example, was deepened into early Cretaceous sandstone, making the Liza Deep discovery.
OilNOW understands that the Ranger discovery which is 100 kilometres to the northwest of the Liza cluster, opened a Cretaceous-aged carbonate build-up with a Tertiary clastic cover. It is described as a large structural trap with a four-way closure.
Westwood Energy Group has said more oil and gas were discovered in stratigraphic traps than any other trap type in the last decade and the Guyana-Suriname basin remains one of the most prolific.
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