據(jù)《今日石油網(wǎng)》2021年7月12日報道，挪威著名能源研究和商業(yè)情報公司雷斯塔能源公司（Rystad）在其最新的一份報告中稱，全球油氣公司正日益將勘探和生產(chǎn)活動范圍縮小到更少的地區(qū)和遠景區(qū)，以確保在本世紀末石油需求開始下降時，投資最有利可圖的原油。

　　這家總部位于挪威奧斯陸的能源咨詢公司表示：“在這一過程中，分析地下資料至關重要，以便了解哪些遠景區(qū)、國家和盆地在油藏產(chǎn)能方面提供最佳機會。”最近，Rystad在上游解決方案中推出了儲層和油源巖參數(shù)，以幫助客戶在全球范圍內評估和確定油氣遠景區(qū)。

　　包括二疊紀、泥盆紀、三疊紀和石炭紀在內的較老遠景區(qū)至今已向人類共貢獻了大約2470億桶油當量的石油和天然氣。

　　到目前為止，圭亞那海域已獲得大約23個新石油發(fā)現(xiàn)，其中20個石油發(fā)現(xiàn)是在埃克森美孚公司擔任作業(yè)者的斯塔布魯克區(qū)塊內獲得的。地質專家認為，圭亞那盆地是最令人興奮的勘探熱點，美國石油巨頭率先展示了圭亞那盆地出色的勘探前景。

　　《今日石油網(wǎng)》日前從伍德麥肯茲的一份報告中看到，專家們將圭亞那盆地描述為一個發(fā)育良好的半地塹，其主要油源巖是世界級的坎赫組，屬于森諾曼家階-土倫階年代。

　　伍德麥肯茲的官員說，這相當于在哥倫比亞和特立尼達等世界上最令人羨慕的油氣國發(fā)現(xiàn)的油源層。 《今日石油網(wǎng)》了解到圭亞那盆地的油源巖非常成熟，已知運移距離超過200公里。

　　迄今為止，圭亞那盆地已形成3個遠景區(qū)。伍德麥肯茲專家指出，埃克森美孚公司在斯塔布魯克區(qū)塊的大多數(shù)發(fā)現(xiàn)都是在晚白堊紀，地層圈閉中的濁積砂巖儲層，并補充說儲層質量優(yōu)良，具有多重達西滲透率。 例如，麗莎-3評價井被深鉆到早白堊紀砂巖中，從而獲得了麗莎深層發(fā)現(xiàn)。

　　《今日石油網(wǎng)》了解到，在麗莎油田群西北方100公里處的Ranger發(fā)現(xiàn)開啟了白堊紀碳酸鹽巖沉積，并帶有第三紀碎屑蓋層。 它被描述為具有四通閉合的大型構造圈閉。

　　韋斯特伍德能源集團表示，在過去十年中，在晚白堊紀地層圈閉中發(fā)現(xiàn)的石油和天然氣比其他任何圈閉類型都要多，而圭亞那-蘇里南盆地迄今仍然是最多產(chǎn)的圈閉之一。

　　李峻 編譯自 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.