青东凹陷东部边界走滑断层识别、特征分析及对构造圈闭的控制作用
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摘要
青东凹陷东部边界走滑断层属于郯庐断裂西南分支,控制着凹陷整体构造格局。通过分析地震波组特征、最大振幅属性及数据体切片,开展了青东凹陷东部边界走滑断层识别,对其平面分段特征进行了分析,结合凹陷构造演化史分析,认为东部边界走滑带断裂系统具有明显的走滑扭动成因,沿走向上呈"S型"或"反S型"弯曲展布,造成了不同弯曲部位的局部应力场与应变的不同,从而控制了构造圈闭的形成与古地貌及砂体的展布。在此基础上确定了凹陷边界走滑断裂带南北2个"S型"转弯下降盘的大型鼻状构造,并指出其为有利勘探目标区。
As the southwest branch of Tanlu fault zone,the east boundary strike-slip fault in Qingdong sag controlled the overall tectonic framework in the sag. This strike-slip fault was identified by analyzing wave group,maximum amplitude attributes and data volume slices,and it was considered that the east boundary fault was obviously in origin of strike-slip wrench movement,with some bends of "S type"or "anti-S type"along its strike,by analyzing its areal segmentation and the tectonic evolution history in the sag. The different local stress field and strain at different bends have controlled the formation of structural traps and the distribution of palaeogeomorphic elements and sand bodies. Furthermore,large nose structures were identified in the downthrown sides of two "S type"bends in the northern and southern fault,and the favorable exploration targets were also indicated.
As the southwest branch of Tanlu fault zone,the east boundary strike-slip fault in Qingdong sag controlled the overall tectonic framework in the sag. This strike-slip fault was identified by analyzing wave group,maximum amplitude attributes and data volume slices,and it was considered that the east boundary fault was obviously in origin of strike-slip wrench movement,with some bends of "S type"or "anti-S type"along its strike,by analyzing its areal segmentation and the tectonic evolution history in the sag. The different local stress field and strain at different bends have controlled the formation of structural traps and the distribution of palaeogeomorphic elements and sand bodies. Furthermore,large nose structures were identified in the downthrown sides of two "S type"bends in the northern and southern fault,and the favorable exploration targets were also indicated.
引文
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[13]COWIE P A,GUPTA S,DAWERS N H.Implications of fault array evolution for synrift depocentre development:insights from a numerical fault growth model[J].Basin Research,2000,12:241-261.
[2]王亮,杜晓峰,张海霞,等.渤海南部海域青东凹陷油气成藏主控因素分析[J].石油地质与工程,2009,23(5):18-24.Wang Liang,Du Xiaofeng,Zhang Haixia,et al.The analysis of main controlling factors of hydrocarbon accumulation in Qingdong sag of southern Bohai Sea area[J].Petroleum Geology and Engineering,2009,23(5):18-24.
[3]向淑敏,李建平,王根照,等.青东凹陷古近系沙三段中亚段构造-古地貌对沉积的控制[J].大庆石油学院学报,2010,34(1):1-4.Xiang Shumin,Li Jianping,Wang Genzhao,et al.Tectonic-paleogeomorphic controlled on deposition of Paleogene Es3min Qingdong sag[J].Journal of Daqing Petroleum Institute,2010,34(1):1-4.
[4]俞家声,王普伟,林玉祥.青东凹陷油气资源潜力[J].油气地质与采收率,2001(1):5-8.Yu Jiasheng,Wang Puwei,Lin Yuxiang.Potential of oil and gas resources in Qingdong sag[J].Petroleum Geology and Recovery Efficiency,2001(1):5-8.
[5]李春荣,辛仁臣,李建平,等.郯庐断裂对青东凹陷古近纪沉积体系的控制[J].新疆石油地质,2008,29(2):209-213.Li Chunrong,Xin Renchen,Li Jianping,et al.Controls of Tan-Lu fault on Paleogene depositional system in Qingdong sag[J].XinJiang Petroleum Geology,2008,29(2):209-213.
[6]侯安平,王旭红,朱文军.柴达木盆地马海平顶山区断裂活动与油气运聚[J].石油物探,2007,46(6):643-648.Hou Anping,Wang Xuhong,Zhu Wenjun.Fracture activities and hydrocarbon accumulation in Pingdingshan area of Mahai,Chaidamu basin[J].Geophysical Prospecting for Petroleum,2007,46(6):643-648.
[7]单宝忠.济阳坳陷边界断裂几何学特征及其对油气成藏的控制作用[J].特种油气藏,2007,14(1):19-21.Shan Baozhong.Geometry of border faults and their control effect on oil and gas accumulation in Jiyang Depression[J].Special Oil and Gas Reservoirs,2007,14(1):19-21.
[8]徐长贵,于水,林畅松,等.渤海海域古近系湖盆边缘构造样式及其对沉积层序的控制作用[J].古地理学报,2008,10(6):627-634.Xu Changgui,Yu Shui,Lin Changsong,et al.Structural styles of the Paleogene lacustrine basin margin and their control on sedimentary sequences in Bohai Sea area[J].Journal of Palaeogeography,2008,10(6):627-634.
[9]杨贵丽.济阳坳陷青东凹陷构造格局及构造演化[J].油气地质与采收率,2011,18(1):7-10.Yang Guili.Structural framework and evolution of Qingdong sag,Bohai Bay Basin[J].Petroleum Geology and Recovery Efficiency,2011,18(1):7-10.
[10]徐长贵.渤海古近系坡折带成因类型及其对沉积体系的控制作用[J].中国海上油气,2006,18(6):365-370.Xu Changgui.Genetic types of Paleogene slope-break zones and their controls on depositional system in Bohai offshore[J].China Offshore Oil and Gas,2006,18(6):365-370.
[11]柳永军,朱文森,杜晓峰,等.渤海海域辽中凹陷走滑断裂分段性及其对油气成藏的影响[J].石油天然气学报,2012,34(7):6-10.Liu Yongjun,Zhu Wensen,Du Xiaofeng,et al.Strike-slip fault subsections and its influence on hydrocarbon accumulation in Liaozhong depression of Bohai Sea area[J].Journal of Oil and Gas Technology,2012,34(7):6-10.
[12]LEZZAR K E,TIERCELIN J J.Control of normal fault interaction on the distribution of major Neogene sedimentary depocenters,lake Tanganyika,east African rift[J].AAPG Bulletin,2002,86(6):1027-1059.
[13]COWIE P A,GUPTA S,DAWERS N H.Implications of fault array evolution for synrift depocentre development:insights from a numerical fault growth model[J].Basin Research,2000,12:241-261.
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