Lacustrine basin unconventional resource plays: Key differences |
| |
| Institution: | 1. Schlumberger, Mill Valley, CA, USA;2. Department of Geological & Environmental Sciences, Stanford University, Palo Alto, CA, USA;3. PEER Institute, Covina, CA, USA, Current address: ConocoPhillips, Houston, TX, USA;4. Schlumberger-Doll Research, Cambridge, MA, USA;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, PR China;2. College of Geosciences, China University of Petroleum, Beijing 102249, PR China;3. PetroChina Xinjiang Oilfield Company, Karamay 834000, PR China;4. Exploration and Development Research Institute of PetroChina Huabei Oilfield Company, Renqiu City, Hebei Province 062552, PR China;5. CNPC International Kazakhstan;6. PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, PR China;7. China Oilfield Services Limited Oilfield Production Optimization Institution, PR China;1. Geological Survey of Canada, 3303-33 Street NW, Calgary,Alberta T2L 2A7,Canada;2. China State Key Laboratory of Shale Oil and Shale Gas Resources and Effective Development, Sinopec Petroleum Exploration and Production Research Institute,31 Xueyuan Road, Haidian District, Beijing 100083,China;3. China University of Petroleum (Beijing), 18 Fuxue Road,Changping District, Beijng 102249,China;4. Sinopec Jianghan Oilfield Company,18 Daxueyuan Road, Gaoxin District, Wuhan, Hubei 430223, China;1. China State Key Laboratory of Shale Oil and Shale Gas Resources and Effective Development, Sinopec Petroleum Exploration & Production Research Institute, 31 Xueyuan Road, Haidian District, Beijing 100083, China;2. Geological Survey of Canada, 3303-33 Street NW, Calgary, Alberta T2L 2A7, Canada;3. China University of Petroleum (Beijing),18 Fuxue Road, Changping District, Beijng 102249, China;4. Sinopec Jianghan Oilfield Company, 18 Daxueyuan Road, Gaoxin District, Wuhan, Hubei 430223, China |
| |
| Abstract: | There has been a revival in hydrocarbon source rock characterization and development associated with growing interest in unconventional resources, where these fine-grained organic-rich rocks act as both source and reservoir. To-date, the exploration focus on shale reservoirs has been largely on marine systems. Lacustrine source rocks for conventional resources are geographically important, dominating regions such as China, Indonesia, and Brazil's resource-base. However, they have been generally untested for unconventional resources.There are a number of key differences in the nature of these hydrocarbon systems that should be considered when assessing whether lacustrine systems may represent future unconventional opportunities in areas where the conventional resource-base is dominated by lacustrine-sourced oil. Among the key differences between these depositional systems is the greater sensitivity to high frequency climatic variability within lacustrine systems. Lacustrine systems are highly sensitive to changes in the balance between precipitation and evaporation, which may lead to rapid changes in lake level, potentially exceeding 600 m. These changes in depositional conditions are geologically rapid and may occur over periods of thousands of years. Such changes can reduce the areal extent of potentially thick source rock intervals to only those portions of a basin where a permanent deep lake was present. Thus the core unconventional target area may be geographically limited compared with their marine counterpart. Although potentially areally limited, a review of many lacustrine source rocks suggests that their thicknesses are often significantly greater than marine source rocks. An examination of the more distal portions of lacustrine systems, where better source rock potential is present reveals that there is generally limited connectivity between source and conventional reservoir. In these settings, such as the Wind River basin (Waltman Shale), the hydrocarbons remain trapped within the shales, potentially leading to over-pressured hydrocarbon charged systems. Such conditions suggest that although areally limited, viable unconventional targets may exist, if suitable reservoir conditions are present. Finally, the character of the oils produced is different in these settings, with lacustrine oils being waxy and displaying different hydrocarbon generation and cracking kinetics. High wax oils display distinct flow characteristics, being more viscous, and may offer different production challenges than their non-waxy marine equivalents. Additionally, differences in their cracking kinetics may indicate that the timing of gas generation for shale gas plays may differ significantly from marine systems. |
| |
| Keywords: | Cracking kinetics Fracability Generation kinetics Lake level Shale gas Shale oil Waltman Shale Wind River basin |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
