Sealing of Matching between Fault and Caprock to Oil-Gas Migration along Faults: An Example from Middle and Shallow Strata in Nanpu Depression
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摘要: 为了研究南堡凹陷中浅层油气成藏规律, 采用区域性盖层厚度与断裂断距大小比较和与油气分布关系分析的研究方法, 对断盖配置对沿断裂运移油气的封闭作用进行了研究.结果表明: 断盖配置对沿断裂运移油气有3级封闭作用: (1)当盖层厚度大于断裂断距, 且断接厚度大于一定值时, 盖层与断裂配置对沿断裂运移油气可起完全封闭作用; (2)当盖层厚度大于断裂断距, 但断接厚度小于一定值时, 断盖配置对沿断裂运移油气可起部分封闭作用; (3)当盖层厚度小于断距, 断接厚度小于零时, 断盖配置对沿断裂运移油气无封闭作用.南堡凹陷3套区域性盖层中东二段泥岩和馆三段火山岩2套区域性盖层与断裂配置对沿断裂运移油气均具有完全、部分和无封闭三级作用, 明下段泥岩区域性盖层与断裂配置仅具完全封闭作用.3套区域性盖层与断裂配置的封闭作用之间, 空间不同配置对南堡凹陷中浅层油气聚集分布层位和区域的控制作用主要表现在以下3个方面: (1)南堡2号地区东二段区域性盖层与断裂配置为完全封闭, 油气主要分布在其下; (2)南堡1~5区块东二段区域性盖层与断裂配置为部分或无封闭, 馆三段区域性盖层与断裂配置为完全封闭, 油气主要分布在东一段和馆四段; (3)南堡1号和4号局部地区东二段和馆三段区域性盖层与断裂配置为部分或无封闭, 明下段区域性盖层与断裂配置为完全封闭, 油气从下至上皆有分布.Abstract: To study oil-gas accumulation law of middle and shallow strata in Nanpu depression, sealing of matching between fault and caprock to oil-gas migrating through faults was studied by the method contrasting between thickness of caprock and fault distance and analyzing the relation between it and oil-gas distribution. The results indicate that there are three grades sealing of regional caprock to oil-gas migration through faults: (1) when thickness of caprock is bigger than fault distance and faulted thickness of caprock is bigger than a fixed value, matching between fault and caprock can seal fully oil-gas migration through faults; (2) when thickness of caprock is less than fault distance and faulted thickness of caprock is less than a fixed value, matching between fault and caprock can partially seal oil-gas migration through faults; (3) when thickness of caprock is less than fault distance and faulted thickness of regional caprock is less than zero, matching between fault and caprock can not seal oil-gas migration through faults. Matching between faults and regional caprock of Ed2 and Ng3 both have a full, partial and no sealing to oil-gas migration through faults, and matching between faults and regional caprock of Nm1 has full sealing to oil-gas migration through faults in Nanpu depression. Controlling of relation of matching among sealing of matching between fault and three regional caprock to oil-gas migrating through faults to oil-gas accumulation horizons and areas is shown in following three aspects: (1) matching between faults and regional caprock of Ed2 in Nanpu2 region has full sealing, oil-gas distributes under it; (2) Matching between faults and regional caprock of Ed2 in Nanpu 1-5 block has partial or no sealing, but matching between faults and regional caprock of Ng3 has full sealing, oil-gas distributes mainl in Ed3 and Ng4; (3) Matching between faults and regional caprock of Ed2 and Ng3 in the part of Nanpu1 and Nanpu4 structures have partial or no sealing, but matching between faults and regional caprock of Nm1 has full sealing, oil-gas distributes from lower to upper.
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图 1 南堡凹陷中浅层盖层与油气剖面分布关系
Fig. 1. Relation between caprocks and oil-gas distribution of middle and shallow strata in Nanpu depression
图 2 南堡凹陷盖层分布
a.东二段泥岩盖层分布；b.馆三段火山岩盖层分布；c.明下段泥岩盖层分布
Fig. 2. Distribution of caprock in Nanpu depression
图 3 南堡凹陷中浅层输导断裂分布
Fig. 3. Distribution of faults transporting oil-gas of middle and shallow strata in Nanpu depression
图 4 断盖配置对沿断裂运移油气封闭作用模式
a.无封闭作用；b.部分封闭作用；c.完全封闭作用
Fig. 4. Scheme of sealing models of matching between fault and caprock to oil-gas migtation along faults
图 5 南堡凹陷盖层断接厚度与油气显示之间分布关系
a.东二段泥岩盖层；b.馆三段火山岩盖层
Fig. 5. Relation between effective thickness of caprock faulted and oil-gas displays in Nanpu depression
图 6 南堡凹陷2号东东二段泥盖层断接厚度与油气显示之间分布关系
Fig. 6. Relation between effective thickness of Ed2 mudstone caprock faulted and oil-gas displays in No.2 structure of Nanpu depression
图 7 南堡凹陷1~5区东二段泥盖层、馆三段火山岩盖层断接厚度与油气显示之间分布关系
Fig. 7. Relation between effective thickness of Ed2 mudstone caprock and Ng3 volcanic caprock faulted and oil-gas displays in 1-5 area of Nanpu depression
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