Strike-Slip Transfer Zone and Its Control on Formation of Medium and Large-Sized Oilfields in Bohai Sea Area
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摘要: 渤海海域郯庐走滑断裂带是重要的油气富集带，但是长期以来，该带对大中型油气田控制作用不明确.利用覆盖渤海郯庐断裂带的三维地震资料和400多口钻井资料对渤海海域走滑转换带特征及其与大中型油田形成关系进行了系统的分析.研究认为，新生代以来，渤海海域发育了多类型、多成因、多级次、多期次的走滑转换带；根据转换带在走滑断裂带中发育的位置，可以将渤海海域走滑转换带划分为断边转换带、断间转换、断梢转换带三大类，进一步根据断层的相互作用以及转换带的形态，可以将渤海海域转换带分为S型转换带、叠覆型转换带、双重型转换带、帚状转换带、叠瓦扇型转换带、共轭转换带以及复合转换带7种类型；根据局部应力状态可以分为增压型转换带和释压型转换带；根据转换带的规模，渤海海域走滑转换带可以分为一级转换带、二级转换带和三级转换带；增压型转换带控制了大型有效圈闭的发育、运移条件通畅等大中型油田基本成藏要素，进而控制了大中型油气田的分布.Abstract: Tan-Lu strike-slip fault in Bohai sea area is an important hydrocarbon enrichment zone. But it is not clear whether strike-slip transfer zone controls on the formation of medium and large-sized oilfields. This paper systematically analyzes the Tan-Lu strike-slip transfer zone and its control on the development of medium and large-sized oilfields on the basis of detailed interpretation of 400 wells and 3-D seismic data over the fault zone. Three types of transfer zones developed in the Tan-Lu strike-slip fault zone are recognized according to the position of the transition zone in the strike-slip fault zone, which are named as fault-edge transfer zones, fault-overlap transfer zones and fault terminal transfer zones respectively. These transitions can be further divided into seven types, which are sigmoid, overlapping, duplex, broom-like, shingled, conjugated and compound types of transfer zones. According to the local stress state, each type of transfer zone is further subdivided into contractional and extensional types of transfer zones. Contractional transfer zones control the formation of large-scale traps, whereas extensional transfer zones control the formation of small-scale traps. Geological oil reserves related to contractional transfer zones account for up to 81% of total geological oil reserve of the Tan-Lu strike-slip fault zones. Therefore, contractional transfer zones developed in the strike-slip fault zones should serve as excellent exploration targets for the large-scale oilfield with great potential.
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图 2 渤海海域断边转换带两种类型实例
a.S型转换带(辽西走滑带锦州20段)；b.帚状转换带(辽东走滑带锦州23段)
Fig. 2. Two types of transition zones developed at the edge of the fault in Bohai Sea area
图 3 渤海海域增压型走滑转换带与释压型走滑转换带发育模式
a.右旋走滑S型转换带；b.左旋走滑S型转换带；c.右旋走滑帚状转换带；d.左旋走滑帚状转换带；e.右旋走滑叠覆型转换带；f.左旋走滑叠覆型转换带；g.右旋走滑双重型转换带；h.左旋走滑双重型转换带；i.共轭型转换带；j.右旋走滑叠瓦扇型转换带
Fig. 3. Model of the restrain and releasing strike slip transition zone in Bohai Sea area
图 4 辽西走滑带锦州25-1油田叠覆型转换带圈闭发育特征
左图：为锦州5-1油田沙二段顶面构造简图，显示右旋左阶增压型叠覆型转换带形成大型反转背斜圈闭，右旋右阶释压型转换带形成小型断鼻型圈闭；右图：两种类型转换带形成的圈闭剖面特征
Fig. 4. The trap distribution of overlapping transition zone in Jinzhou 25-1 oil field of Liaoxi strike-slip fault zone
图 5 渤海海域双重型走滑转换带特征
左图：蓬莱19-3油田增压型双重走滑转换带；右图：金县1-1油田释压型双重走滑转换带
Fig. 5. Characteristics of duplex transition zone in Bohai Sea area
图 6 渤海海域曹妃甸5-5地区共轭转换带特征
Fig. 6. Characteristic of conjugated transition zone in Caofeidian 5-5 of Bohai Sea area
图 7 渤海辽东凸起北段复合转换带特征
Fig. 7. Compound transition zone characteristics in the northern Liaodong uplift of Bohai Sea area
图 8 渤海走滑转换带级次特征
Fig. 8. Characteristics of strike slip transition zone orders in Bohai Sea area
图 9 渤海海域不同类型走滑转换带圈闭特征
Fig. 9. Traps characteristics of the different types strike slip transition zone in Bohai sea area
图 10 旅大6-2油田转换带调节断裂与油气富集的关系
a.旅大6-2油田X井油藏剖面图；b.旅大6-2油田东二下段顶面构造图
Fig. 10. Relationship between the adjustment fault and the hydrocarbon of the transition zone
图 11 S型走滑转换带增压带与释压带圈闭侧封性差异物理模拟(右旋走滑)
a.走滑量2 cm；b.走滑量6 cm.物理模拟表明，增压区断裂的闭合程度强于释压区，随着走滑距离的增加，增压区闭合程度增加
Fig. 11. The physical modeling of the difference of trap side sealing between restrain and releasing belts of sigmoid strike slip transition zone(dextral strike-slip)
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