{"title":"古岩溶对利比亚锡尔特盆地尖岩礁储层的影响","authors":"Abdeladim M. Asheibi, Asghar Shams","doi":"10.1144/petgeo2023-008","DOIUrl":null,"url":null,"abstract":"More than twenty pinnacle reefs have been discovered in the southeast of Ajdabiya Trough within the Paleocene carbonate sediments, most of which are oil-bearing. However, detailed reservoir characterization and conditions governing oil fill-up in this reef remained unresolved. The major faults provide paths for significant vertical movement of fluids at the edges of the Intisar reef reservoirs. At the same time, the ongoing karst-solution collapse also creates vertical zones for fluids encroachment both outside of and within the productive area of the Intisar reef reservoirs. The seismic data shows numerous karst-collapse features up to 300 m in diameter which developed shortly after the final drowning of Intisar ‘B’ and ‘C’ reefs. These karst-collapse features may be the main contributing factor to the escape of hydrocarbons within these reefs, which could explain the high-water cuts in the Intisar ‘B’ and ‘C’ reefs. On the other hand, the porosity of the southeastern part of the Intisar ‘A’ reef was significantly improved by fracturing and dissolution, where faults associated with fractures are most common in this part of this reef.","PeriodicalId":49704,"journal":{"name":"Petroleum Geoscience","volume":null,"pages":null},"PeriodicalIF":1.9000,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Impact of Paleokarst on the Pinnacle Reef Reservoirs in the Sirt Basin, Libya\",\"authors\":\"Abdeladim M. Asheibi, Asghar Shams\",\"doi\":\"10.1144/petgeo2023-008\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"More than twenty pinnacle reefs have been discovered in the southeast of Ajdabiya Trough within the Paleocene carbonate sediments, most of which are oil-bearing. However, detailed reservoir characterization and conditions governing oil fill-up in this reef remained unresolved. The major faults provide paths for significant vertical movement of fluids at the edges of the Intisar reef reservoirs. At the same time, the ongoing karst-solution collapse also creates vertical zones for fluids encroachment both outside of and within the productive area of the Intisar reef reservoirs. The seismic data shows numerous karst-collapse features up to 300 m in diameter which developed shortly after the final drowning of Intisar ‘B’ and ‘C’ reefs. These karst-collapse features may be the main contributing factor to the escape of hydrocarbons within these reefs, which could explain the high-water cuts in the Intisar ‘B’ and ‘C’ reefs. On the other hand, the porosity of the southeastern part of the Intisar ‘A’ reef was significantly improved by fracturing and dissolution, where faults associated with fractures are most common in this part of this reef.\",\"PeriodicalId\":49704,\"journal\":{\"name\":\"Petroleum Geoscience\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2024-01-31\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Petroleum Geoscience\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1144/petgeo2023-008\",\"RegionNum\":4,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Petroleum Geoscience","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1144/petgeo2023-008","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
Impact of Paleokarst on the Pinnacle Reef Reservoirs in the Sirt Basin, Libya
More than twenty pinnacle reefs have been discovered in the southeast of Ajdabiya Trough within the Paleocene carbonate sediments, most of which are oil-bearing. However, detailed reservoir characterization and conditions governing oil fill-up in this reef remained unresolved. The major faults provide paths for significant vertical movement of fluids at the edges of the Intisar reef reservoirs. At the same time, the ongoing karst-solution collapse also creates vertical zones for fluids encroachment both outside of and within the productive area of the Intisar reef reservoirs. The seismic data shows numerous karst-collapse features up to 300 m in diameter which developed shortly after the final drowning of Intisar ‘B’ and ‘C’ reefs. These karst-collapse features may be the main contributing factor to the escape of hydrocarbons within these reefs, which could explain the high-water cuts in the Intisar ‘B’ and ‘C’ reefs. On the other hand, the porosity of the southeastern part of the Intisar ‘A’ reef was significantly improved by fracturing and dissolution, where faults associated with fractures are most common in this part of this reef.
期刊介绍:
Petroleum Geoscience is the international journal of geoenergy and applied earth science, and is co-owned by the Geological Society of London and the European Association of Geoscientists and Engineers (EAGE).
Petroleum Geoscience transcends disciplinary boundaries and publishes a balanced mix of articles covering exploration, exploitation, appraisal, development and enhancement of sub-surface hydrocarbon resources and carbon repositories. The integration of disciplines in an applied context, whether for fluid production, carbon storage or related geoenergy applications, is a particular strength of the journal. Articles on enhancing exploration efficiency, lowering technological and environmental risk, and improving hydrocarbon recovery communicate the latest developments in sub-surface geoscience to a wide readership.
Petroleum Geoscience provides a multidisciplinary forum for those engaged in the science and technology of the rock-related sub-surface disciplines. The journal reaches some 8000 individual subscribers, and a further 1100 institutional subscriptions provide global access to readers including geologists, geophysicists, petroleum and reservoir engineers, petrophysicists and geochemists in both academia and industry. The journal aims to share knowledge of reservoir geoscience and to reflect the international nature of its development.