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现代地质 ›› 2017, Vol. 31 ›› Issue (02): 348-356.

• 能源地质学 • 上一篇    下一篇

油气沿不同时期断裂穿过泥岩盖层渗滤散失的地质条件及其识别方法

王超1(), 付广1, 董英洁2   

  1. 1.东北石油大学 地球科学学院,黑龙江 大庆 163318
    2.大庆油田有限责任公司 第一采油厂,黑龙江 大庆 163001
  • 收稿日期:2016-10-18 修回日期:2016-12-10 出版日期:2017-04-10 发布日期:2017-04-25
  • 作者简介:王 超,男,博士研究生,1986年出生,地质资源与地质工程专业,从事断层侧向封闭研究。Email:wangttyingjie@163.com
  • 基金资助:
    国家自然科学基金项目(41372154);国家自然科学基金项目(41372153);东北石油大学研究生创新科研项目“油气成藏期断层侧向封闭能力综合定量评价”(YHSCX2015-002NEPU)

Geological Conditions and Recognition Methods of Oil-gas Leakage out Through Mudstone Caprock Along Fault in Different Periods

WANG Chao1(), FU Guang1, DONG Yingjie2   

  1. 1. Faculty of the Earth Sciences,Northeast Petroleum University,Daqing,Heilongjiang 163318,China
    2. The First Oil Production Plant of Daqing Oil Field Co,Daqing,Heilongjiang 163001,China
  • Received:2016-10-18 Revised:2016-12-10 Online:2017-04-10 Published:2017-04-25

摘要:

为了研究含油气盆地断裂发育区油气分布规律,在确定油气沿活动期和静止期断裂穿过泥岩盖层发生渗滤散失机理的基础上,针对油气沿活动期和静止期断裂穿过泥岩盖层渗滤散失的地质条件及识别方法进行了研究。研究结果表明:油气沿活动期断裂穿过泥岩盖层渗滤散失所需的地质条件是活动期断裂在盖层内上下连接分布,作为油气穿过泥岩盖层的输导通道;油气沿静止期断裂穿过泥岩盖层渗滤散失所需的地质条件是下伏储层油气剩余压力大于断层岩排替压力。通过比较泥岩盖层断接厚度与油气沿活动期断裂穿过泥岩盖层渗滤散失所需最小断接厚度的相对大小和下伏储层剩余压力与断层岩排替压力的相对大小,分别建立了油气是否沿活动期断裂和静止期断裂穿过泥岩盖层渗滤散失的识别方法,并将其应用于渤海湾盆地南堡凹陷南堡5号构造天然气能否通过活动期和静止期NP5-2断裂穿过东二段泥岩盖层渗滤散失的识别。结果表明:在断裂活动期,仅在L2和L8测线处天然气可以沿着NP5-2断裂穿过东二段泥岩盖层渗滤散失,其余测线处(L1、L3、L4、L5、L6、L7、L9)则不能;但是在断裂静止期,天然气不能沿NP5-2断裂穿过东二段泥岩盖层渗滤散失,与目前南堡5号构造东二段泥岩盖层之下已发现的天然气分布相吻合,表明这2种方法分别用于识别油气是否通过静止期断裂和活动期断裂穿过泥岩盖层渗滤散失是可行的。

关键词: 油气, 泥岩盖层, 活动期断裂, 静止期断裂, 渗滤散失, 地质条件, 识别方法

Abstract:

In order to study the oil-gas distribution law with fracture zone in the oil-gas bearing basin, based on the mechanism of oil-gas leakage out through mudstone caprock by active and static faults, the geological conditions and recognition methods of oil-gas leakage out through mudstone caprock along the active and static faults were studied, and the research indicated that: the geological condition of oil-gas leakage out through mudstone caprock by active fault is the active fault connected up and down in mudstone caprock, which becomes the oil-gas transportation pathway through mudstone caprock, and the condition of oil-gas leakage out through mudstone caprock by static fault is in which the oil-gas residual pressure of underlying reservoir is larger than displacement pressure of still fault rock. Through comparison between oil-gas residual pressure in underlying reservoir and still fault rock displacement pressure, and between fault connected thickness in mudstone caprock and minimum necessary fault connected thickness of oil-gas leakage out through mudstone caprock by active fault, recognition method is set about whether oil-gas leaks out through mudstone caprock by active fault or still fault, which is applied into recognition of whether gas from Es3 and Es1 source rocks leak out through Ed2 mudstone caprock by active fault in Nanpu sag, Bohaiwan basin. The results show that :In faulting period, nature gas can leak out through mudstone caprock of Ed2 by active NP5-2 fault in lines L2 and L8, and in the rest place(L1、L3、L4、L5、L6、L7、L9) can’t. However, in fracture static period, nature gas can’t leak out through mudstone caprock of Ed2 along the NP5-2 fault. The recognition result coincides with present gas distribution under mudstone caprock of Ed2 in the Nanpu Structure 5, which indicates that these two methods are feasible to be applied into recognition of whether oil-gas leak out through mudstone caprock by active and static fault.

Key words: oil-gas, mudstone cap rock, active fault, still fault, leakage out, geological condition, recognition method

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