地学前缘 ›› 2023, Vol. 30 ›› Issue (6): 305-315.DOI: 10.13745/j.esf.sf.2023.2.30

• 海相深层-超深层碳酸盐岩油气动态成藏和聚集 • 上一篇    下一篇

塔里木盆地顺托果勒地区奥陶系碳酸盐岩超压差异分布研究

曾帅1,2(), 邱楠生1,2,*(), 李慧莉3, 马安来3, 朱秀香4, 贾京坤1,5, 张梦霏1,2   

  1. 1.中国石油大学(北京) 油气资源与工程全国重点实验室, 北京 102249
    2.中国石油大学(北京) 地球科学学院, 北京 102249
    3.中国石化石油勘探开发研究院, 北京 100083
    4.中国石化西北油田分公司, 新疆 乌鲁木齐 830011
    5.中国石化集团经济技术研究院有限公司, 北京 100029
  • 收稿日期:2023-01-16 修回日期:2023-02-19 出版日期:2023-11-25 发布日期:2023-11-25
  • 通信作者: * 邱楠生(1968—),男,教授,博士生导师,主要从事沉积盆地温压场及油气成藏机理研究工作。E-mail: qiunsh@cup.edu.cn
  • 作者简介:曾帅(1998—),男,博士研究生,地质资源与地质工程专业。E-mail: ZengS7@126.com
  • 基金资助:
    国家自然科学基金企业联合创新发展联合基金项目“海相深层油气富集机理与关键工程技术基础研究(U19B6003)

Differential overpressure distribution in Ordovician carbonates, Shuntuoguole area, Tarim Basin

ZENG Shuai1,2(), QIU Nansheng1,2,*(), LI Huili3, MA Anlai3, ZHU Xiuxiang4, JIA Jingkun1,5, ZHANG Mengfei1,2   

  1. 1. National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
    2. College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
    3. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
    4. Northwest Oilfield Company, SINOPEC, ürümqi 830011, China
    5. Economics & Development Research Institute Company Limited, SINOPEC, Beijing 100029, China
  • Received:2023-01-16 Revised:2023-02-19 Online:2023-11-25 Published:2023-11-25

摘要:

随着塔里木盆地深层勘探领域的不断突破,顺托果勒地区超深层碳酸盐岩层系发现了一系列与走滑断裂有关的异常高压油气藏,但其超压成因和分布规律却少有讨论。相较于伸展盆地与挤压型前陆盆地体系,克拉通内走滑断裂与地层压力关系的研究相对较少,同时碳酸盐岩储层强烈的非均质性也进一步加剧了超压分布的复杂性。本次研究根据钻井测试与生产动态资料,分析了顺托果勒地区压力分布特征与超压储层特征;结合流体包裹体恢复的古压力、天然气地球化学特征与断裂活动期次讨论了顺托果勒地区不同二级构造单元间异常压力的成因机制差异。结果表明,顺北缓坡和顺托低凸起地层超压为天然气充注与构造增压作用产生,而顺南缓坡地层超压主要受原油裂解生气影响。天然气的生成与断裂活动特征决定了顺南地区整体超压、顺北与顺托地区局部超压的分布格局,走滑断控储层的发育模式使得顺托果勒地区中下奥陶统储层压力系统呈现分割状发育特征。

关键词: 顺托果勒低隆起, 走滑断裂, 深层碳酸盐岩, 超压成因机制, 差异分布机理

Abstract:

With the continual advancement in deep exploration in the Tarim Basin, a succession of anomalous high-pressure reservoirs associated with strike-slip faults have been discovered in the ultra-deep carbonate strata of the Shuntuoguole region, but the origin of the overpressure and its distribution pattern have rarely been discussed. Also, the relationship between strike-slip fault and formation pressure in cratons has seldom been studied compared to results for extensional basins and compressive foreland basin systems; whilst strong carbonate reservoir heterogeneity further complicates the overpressure pattern. In this study the characteristics of the present-day pressure field and the main features of overpressure reservoirs are analyzed based on data from drilling tests and production dynamics studies. Further, combined with paleopressure calculation (using fluid inclusions), gas geochemical characteristics and faults activity, the origin of overpressure and its differential distribution in secondary tectonic units of the Shuntuogole area are discussed. The results suggest that the overpressure in the Shunbei slope and Shuntuoguole low uplift is caused by gas charging and tectonic compression, with the former mainly affected by pyrolytic gas generation from crude oil cracking. The gas generation and faults activity determine the differential overpressure distribution, where overpressure occurs widely across the Shunnan area but only locally in the Shunbei and Shuntuoguole areas. The development pattern of the fault-associated reservoirs results in the division of the pressure system in the Shuntuoguole area.

Key words: Shuntuoguole low uplift, strike-slip faults, deep carbonate rock, origin of overpressure, differential distribution mechanism

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