吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (4): 1047-1059.doi: 10.13278/j.cnki.jjuese.201704107

• 地质与资源 • 上一篇    下一篇

查干凹陷中央构造带不同断阶带原油成熟度特征差异及其成因分析

牛子铖1,2, 柳广第1,2, 国殿斌3, 王朋4, 张家舲5, 赵其磊3   

  1. 1. 中国石油大学(北京) 地球科学学院, 北京 102249;
    2. 中国石油大学(北京) 油气资源与探测国家重点实验室, 北京 102249;
    3. 中国石化中原油田分公司勘探开发科学研究院, 河南 濮阳 457001;
    4. 中国石油长庆油田分公司第十采油厂, 甘肃 庆阳 745600;
    5. 中国石油大学(北京) 地球物理与信息工程学院, 北京 102249
  • 收稿日期:2016-09-25 出版日期:2017-07-26 发布日期:2017-07-26
  • 作者简介:牛子铖(1989),男,博士研究生,主要从事油气藏形成机理与分布规律研究,E-mail:zichengniu@163.com
  • 基金资助:
    国家自然科学基金项目（41472114）

Maturity Difference of Crude Oil and Its Cause Analysis Between Different Fault Steps in the Central Structural Belts of Chagan Sag

Niu Zicheng1,2, Liu Guangdi1,2, Guo Dianbin3, Wang Peng4, Zhang Jialing5, Zhao Qilei3   

  1. 1. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    2. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;
    3. Exploration and Development Research Institute, Zhongyuan Oilfield Branch Company, SINOPEC, Puyang 457001, Henan, China;
    4. Tenth Oil Production Plant of PetroChina Changqing Qilfield Company, Qingyang 745600, Gansu, China;
    5. College of Geophysics and Information Engineering, China University of Petroleum, Beijing 102249, China
  • Received:2016-09-25 Online:2017-07-26 Published:2017-07-26
  • Supported by:
    Supported by National Natural Science Foundation of China(41472114)

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摘要： 查干凹陷中央构造带被巴润断裂系分隔成多个断阶，东侧第一断阶和第二断阶含油范围小而西侧第三断阶和第四断阶含油范围大。东部断阶原油成熟度高而西侧断阶原油成熟度低，表现为：第一断阶和第二断阶CPI大多数大于1.20，OEP多数大于1.30，Pr/Ph多数在0.60以下，Ph/nC18普遍高于1.00；第三断阶和第四断阶CPI和OEP小于1.20，Pr/Ph多数在0.60以上，Ph/nC18普遍小于1.00。通过规则甾烷分布特征和原油成熟度特征的分析，确定靠近洼陷的第三和第四断阶的原油更多来自于洼陷中心的烃源岩供烃，而第一断阶和第二断阶则主要是构造带本地烃源岩供烃。钻井、测井资料表明，断层发育诱导裂缝带和滑动破碎带，其中滑动破碎带物性较差，具有良好的封堵性能。非线性随机反演结果表明，巴润3号断层南段致密滑动破碎带稳定发育。断层生长指数研究表明，断层主要在苏二晚期活动，并且巴润3号断层活动性较弱。研究区断层SGR普遍在25%以上，在断层静止期具有良好的封闭性。烃源岩生排烃史模拟和流体包裹体均一温度分析表明，中央构造带主要成藏时间为苏二末期—银根早期，成藏期巴润3号断层由于活动强度较弱，同时沿着断层致密滑动破碎带发育，导致洼陷中形成的原油不易穿过3号断层继续向构造带东侧运移；因此第一断阶和第二断阶主要依赖本地烃源岩供烃，而第三第四断阶为洼陷中心供烃，烃源岩的差异最终导致了不同断阶带原油成熟度的差异。

关键词: 查干凹陷, 原油成熟度, 断裂带结构, 断裂活动性, 成藏模式

Abstract: The central structural belt of Chagan Sag is cut into several fault steps by the Barun fault system, and the oil bearing range in western fault steps is larger than that in the eastern fault steps. The oil CPI in the western fault steps is higher than 1.20, OEP higher than 1.30, Pr/Ph lower than 0.60, and Ph/nC18 higher than 1.00; while the oil CPI and OEP in the eastern fault steps are lower than 1.20, Pr/Ph higher than 0.60, and Ph/nC18 lower than 1.00, indicating the oil maturity is high in the western fault steps. The regular sterane distribution and maturity demonstrate that the oil in the western fault steps was derived from source rocks in the central structure belt; while the oil in the eastern fault steps was derived from source rocks in Hule sub-sag. Internal structures of the fault zones were analyzed using drilling and logging data, and the results reveal that the fault zones are composed of central sliding breaking zones and their induced fractures zones. The sealing capacity of the central sliding breaking zones is better than that of the induced as a result of low permeability. The tight sliding breaking zone is steadily distributed based on a seismic velocity data analysis on the fault that separates the western and eastern fault steps. The faults were active during the deposition of the second member of Suhongtu Formation according to the fault activity analysis. SGR values of the faults are greater than 25%, indicating their excellent sealing capacity. Hydrocarbons accumulated in k1s2-k1y according to the result of source rock generation history modeling and fluid inclusion analysis. Since the activity of Barun 3 fault was weak during the hydrocarbon accumulation period and the tight sliding breaking zone is steadily distributed, hydrocarbons expulsed from the Hule sub-sag cannot migrate to the western fault steps. Different source rocks led to the maturity difference of crude oil in different fault steps.

Key words: Chagan sag, maturity of oil, fault structure, fault activity, hydrocarbon accumulation model

中图分类号: 

  • TE122.3
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