新疆石油地质

新疆石油地质 ›› 2004, Vol. 25 ›› Issue (5): 560-562.

• 讨论与争鸣 • 上一篇    下一篇

塔中4油田油气水界面的变迁与成藏期

王飞宇1,2, 张水昌2, 梁狄刚2   

  1. 1.石油大学石油天然气成藏机理教育部重点实验室,北京 102200;
    2.中国石油油气地球化学重点实验室,北京 100083
  • 收稿日期:2003-10-23 发布日期:2021-01-13
  • 作者简介:王飞宇(1963-),男,浙江黄岩人,教授,博士,地球化学。联系电话:010-89734547

Evolvement of Oil-Gas-Water Contact and Timing of Petroleum Accumulation in Tazhong-4 Field, Tarim Basin

WANG Fei-yu1,2, ZHANG Shui-chang2, LIANG Di-gang2   

  1. 1. Key Laboratory of Petroleum Accumulation Mechanism, Ministry of Education, University of Petroleum, Beijjing 102200, China;
    2. Key Laboratory of Petroleum Geochemistry, PetroChina, Beijing 100083, China
  • Received:2003-10-23 Published:2021-01-13

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摘要： 塔中4油田CⅢ组油气藏今油水界面和古油水界面分别位于-2510m和-2610m,古油水界面呈水平状,近晚期的断裂活动使CⅢ组油藏中油向上运移,在CⅡ和CⅠ储集层聚集, CⅢ组油藏油水界面向上抬升了100m.如果塔中4油田CⅢ组油藏形成是属于“晚海西期成藏,后期调整破坏”,考虑到三叠纪以来构造变动和圈闭形态的变化,必然使得古油水界面呈现一定的倾斜或形态不规则变化。因而,利用油气水界面变迁厘定成藏期时,根据回剥法反演今油水界面在地质时期古埋深,将古埋深连线呈水平状的时间作为成藏期这一思路是错误的。烃类成藏后由于圈闭形态发生变化,不可能如此巧合,使得早期呈水平状的油水界面再度呈水平状。地质记录中古油水界面基本上呈倾斜状,甚至不规则状。正确的思路是识别出古油水界面,根据古油水界面在何时呈现水平状厘定出成藏期。

关键词: 塔里木盆地, 塔中4油田, 油水界面, 油气运移, 油气聚集, 成藏

Abstract: The current OWC (COWC) and paleo-OWC (POWC) in CIHI reservoir in Tazhong-4 oilfield are found in buried depth of 2 5 10m and 2 610m, respectively, and the latter is horizontal in occurrence. The late faulting activity resulted in upward migration of crude oil in CIII reservoir,accumulation in CI and CII reservoirs,causing the POWC in CIII reservoir raising of 100m. If CIHI reservoir was formed in Late Permian and modified after Permian,a tilted or irregular POWC should exist due to tectonic movement and varied trap shapes. Therefore, when using oil-gas-water contact variation to determine petroleum accumulation period, the assumption that according to back-stripping analysis, make inverse calculation the paleo-burial depth of COWC in each well, and take the time of the paleo-burial depth with re-exhibited horizontal form of OWC as the petroleum accumulation period is unrealistic or wrong. It is impossibly so coincident that original OWC will re-exhibit a horizontal form in late period after long-term geological evolution, especially under the condition of trap shape changes. From the ge-ologic records, POWC is generally in tilted and even irregular forms. The corect method should be to identify POWC firstly, and then make determination of the related petroleum accumulation period, based on the time of earlier horizontal form of POWC.

Key words: Tarim basin, Tazhong-4 field, OWC, petroleum migration, petroleum accumulation, reservoir

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