渤海地区底辟构造及其油气地质意义
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摘要
渤海地区主要发育盐底辟和泥底辟,根据地震资料解释成果,对渤海地区的底辟构造及其伴生构造的几何形态特征与形成机制进行了分析,同时探讨了底辟构造与油气聚集成藏的关系。盐底辟外部形态变化较大,周缘伴生构造包括盐边凹陷、龟背构造和丰富的正断层等,盐底辟的形成演化主要受重力滑动作用和郯庐断裂带的走滑作用控制;泥底辟形态变化较小,主要受郯庐断裂带的走滑和反转作用控制。底辟作用形成的相关构造圈闭和隐蔽圈闭都是渤海地区值得关注的有利油气勘探目标。
Diapir structure is a kind of important petroliferous structural styles.Based on the seismic data,the salt and mud diapirs in the offshore Bohai Bay Basin are analyzed,and the result shows that the salt and mud diapirs have various geometries and formation mechanisms,and have also exerted important influences on hydrocarbon accumulation.The shapes of salt diapirs change in different areas,and their associated structures styles involve the salt-withdrawal mini-basins,turtle structures and abundant normal faults.The key factors governing the development of salt diapirs are the gravitational gliding and the dextral strike-slipping movement of the Tan-Lu Fault.However,the mud diapirs have almost no change of shapes,and are controlled by the strike-slipping and reverse movements of the Tan-Lu Fault.The structural and subtle traps induced by the diapirs should be the favorable objectives for oil and gas exploration in the offshore Bohai Bay Basin
Diapir structure is a kind of important petroliferous structural styles.Based on the seismic data,the salt and mud diapirs in the offshore Bohai Bay Basin are analyzed,and the result shows that the salt and mud diapirs have various geometries and formation mechanisms,and have also exerted important influences on hydrocarbon accumulation.The shapes of salt diapirs change in different areas,and their associated structures styles involve the salt-withdrawal mini-basins,turtle structures and abundant normal faults.The key factors governing the development of salt diapirs are the gravitational gliding and the dextral strike-slipping movement of the Tan-Lu Fault.However,the mud diapirs have almost no change of shapes,and are controlled by the strike-slipping and reverse movements of the Tan-Lu Fault.The structural and subtle traps induced by the diapirs should be the favorable objectives for oil and gas exploration in the offshore Bohai Bay Basin
引文
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[3]Alsop G I,Blundell D G,Davison I,et al.Salt tectonics[G].Geo-logical Society Special Publication,1996,100:1-310.
[4]Hudec M R,Jackson M P A.Terra infirma:Understanding salttectonics[J].Earth-Science Reviews,2007,82(1/2):1-28.
[5]Sumner R H,Westbrook G K.Mud diapirism in front of the Bar-bados accretionary wedge:The influences of fracture zones andNorth American—South American Plate motions[J].Marine andPetroleum Geology,2001,18(5):591-613.
[6]黄春菊,陈开远,李思田.莺歌海盆地泥底辟活动期次分析[J].石油勘探与开发,2002,29(4):44-46.Huang Chunju,Chen Kaiyuan,Li Sitian.Periodicities of diapiricrise in the Yinggehai Basin[J].Petroleum Exploration and Devel-opment,2002,29(4):44-46.
[7]刘晓峰,解习农,张成,等.东营凹陷盐-泥构造的样式和成因机制分析[J].地学前缘,2005,12(4):403-409.Liu Xiaofeng,Xie Xinong,Zhang Cheng,et al.Study on structur-al styles and genetic mechanism of salt-mud tectonics in Dongy-ing Depression[J].Earth Science Frontiers,2005,12(4):403-409.
[8]王家豪,庞雄,王存武,等.珠江口盆地白云凹陷中央底辟带的发现及识别[J].地球科学———中国地质大学学报,2006,31(2):209-213.Wang Jiahao,Pang Xiong,Wang Cunwu,et al.Discovery and rec-ognition of the central diapiric zone in Baiyun Depression,PearlRiver Mouth Basin[J].Earth Science:Journal of China Universi-ty of Geosciences,2006,31(2):209-213.
[9]朱伟林,张功成,高乐.南海北部大陆边缘盆地油气地质特征与勘探方向[J].石油学报,2008,29(1):1-9.Zhu Weilin,Zhang Gongcheng,Gao Le.Geological characteristicsand exploration objectives of hydrocarbons in the northern conti-nental margin basin of South China Sea[J].Acta Petrolei Sinica,2008,29(1):1-9.
[10]吴时国,姚根顺,董冬冬,等.南海北部陆坡大型气田区天然气水合物的成藏地质构造特征[J].石油学报,2008,29(3):324-328.Wu Shiguo,Yao Genshun,Dong Dongdong,et al.Geologicalstructures for forming gas hydrate reservoir in the huge deepwa-ter gas field of the northern South China Sea[J].Acta PetroleiSinica,2008,29(3):324-328.
[11]余一欣,周心怀,汤良杰,等.渤海海域莱州湾凹陷KL11-2地区盐构造特征[J].地质学报,2008,82(6):731-737.Yu Yixin,Zhou Xinhuai,Tang Liangjie,et al.Salt structural fea-tures in the KL11-2area of the Laizhouwan depression,offshoreBohai Bay Basin[J].Acta Geologica Sinica,2008,82(6):731-737.
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