摘要
层间断层是一种非构造成因断层,本次研究利用常规地震剖面解释、地震属性提取、相干体、方差体和蚂蚁体技术在渤海湾盆地石南地区东二段识别出密集的层间断层。这些层间断层发育在东二上段厚层砂岩和东二下段厚层泥岩界面附近,断距一般小于100m,断层倾角较大,具有一定的优势走向。根据沿层相干体切片,可以将层间断层划分为三个区带:1研究区西部(区域1),断层的密度最大,每公里5~6条,玫瑰花图显示断层的主走向为135°,其次为50°;2研究区中部(区域2),断层的密度最小,每公里2~3条,断层的主走向为30°,其他走向的断层均有发育,整体表现为发散状;3研究区东部(区域3),断层的密度居中,每公里3~4条,断层的主走向约为140°,其次为25°。在识别小断层或裂缝方面,蚂蚁体技术体现出明显的优势,为研究区层间断层的识别提供了依据。层间断层发育在东二下段成熟烃源岩和上覆砂岩的接触部位,可以作为研究区东营组烃源岩重要的排烃通道,其在油气运移和油气成藏中的意义有待进一步研究。
A series of interbed faults have been identified by an integration of multiple geophysical approaches such as coherence cube,variance cube,ant tracking and so on.These faults were developed along a lithological interface which separates thick sandstone from the underlying mudstone in the second member of the Dongying Formation(E3d2),Bohai Bay Basin,China.They are characterized by small fault throw(commonly no more than 100 m),small lateral extension,and high fault density.Depending on the characteristics of interbed faults,we divide them into three groups:Group 1located in the western of study area with the highest fault density(5~6n/km),and interbed fault main strike directions on rose diagram are135°and 50°;Group 2located in the centre of study area with the lowest fault density(2~3n/km),and interbed fault main strike direction is 30°,and the other strike directions displays radiational;Group 3located in the eastern of study area,the medium fault density(3~4n/km),and interbed fault main strike directions on rose diagram are140°and 25°.The integration of the multiple geophysical approaches provides an effective way to identify small interbed faults.As important conduits for fluid expulsion,these faults need further research in hydrocarbon migration and accumulation in the area.
引文
[1]Cartwright J A.Episodic basin-wide fluid expulsion from geopressured shale sequence in the North Sea Basin.Geology,1994,22(5):447-450.
[2]Cartwright J A.Episodic basin-wide hydrofracturing of overpressured Early Cenozoic mudrock sequences in the North Sea Basin.Marine and Petroleum Geology,1994,11(5):587-607.
[3]Cartwright J,James D,Bolton A.The genesis of polygonal fault systems:A review.Geological Society,London,Special Publications,2003,216:223-243.
[4]Watterson J.Geometry and origin of a polygonal fault system.Journal of Geological Society,2000,157:151-162.
[5]吴时国,孙启良,董冬冬.深水盆地中多边形断层的几何特征与形成机制探讨.地质力学学报,2008,14(3):231-240.Wu Shiguo,Sun Qiliang,Dong Dongdong.The geometrical characteristics and formation mechanism of polygonal faults in deep-water basin.Journal of Geomechanics,2008,14(3):231-240.
[6]吴时国,孙启良,吴拓宇等.琼东南盆地深水区多边形断层的发现及其油气意义.石油学报,2009,30(1):22-26.Wu Shiguo,Sun Qiliang,Wu Tuoyu et al.Polygonal fault and oil-gas accumulation in deep-water area of Qiongdongnan basin.Acta Petrolei Sinica,2009,30(1):22-26.
[7]Sun Qiliang,Wu Shiguo,Yao Genshun et al.Characteristics and formation mechanism of polygonal faults in Qiongdongnan basin,northern South China Sea.Journal of Earth Science,2009,20(1):180-192.
[8]Sun Qiliang,Wu Shiguo,Lv Fuliang et al.Polygonal faults and their implications for hydrocarbon reservoirs in the southern Qiongdongnan basin,South China Sea.Journal of Asian Earth Science,2010,39(5):470-479.
[9]付晓飞,宋岩.松辽盆地三肇凹陷“T11”多边断层非构造成因机制探讨.地质学报,2008,82(6):738-749.Fu Xiaofei,Song Yan.Nontectonic mechanism of polygonal“T11”faults in the Sanzhao sag of Songliao basin.Acta Geologica Sinica,2008,82(6):738-749.
[10]He Chunbo,Tang Liangjie,Huang Deli et al.Polygonal faults in the Sanzhao sag of the Songliao basin:Their significance in hydrocarbon accumulation.Mining Science and Technology,2010,20:300-305.
[11]丁修建,柳广弟,孙明亮等.多边形断层系特征及成因机制——以松辽盆地三肇凹陷为例.石油勘探与开发,2013,40(3):309-319.Ding Xiujian,Liu Guangdi,Sun Mingliang et al.Origin of polygonal fault systems:A case from the Sanzhao sag in the Songliao basin.Petroleum Exploration and Development,2013,40(3):309-319.
[12]田立新.断层平面组合样式对盆地砂体沉积的控制作用.大庆石油学院学报,2012,36(2):1-6.Tian Lixin.The combined patterns of faults controlling on sandbody sedimentation.Journal of Daqing Petroleum Institute,2012,36(2):1-6.
[13]周心怀,赖维成,杜晓峰等.渤海海域隐蔽油气藏勘探关键技术及其应用成效.中国海上油气,2012,24(增刊1):11-18.Zhou Xinhuai,Lai Weicheng,Du Xiaofeng et al.Some key exploration techniques for the subtle reservoirs and their application in Bohai water.China Offshore Oil and Gas,2012,24(S1):11-18.
[14]杜文波,朱红涛,杨香华等.渤海湾盆地QHD29-2区块东营组东三段沉积与构造—古地貌的响应.海洋地质与第四纪地质,2011,31(6):47-54.Du Wenbo,Zhu Hongtao,Yang Xianghua et al.Deposition of the Ed3of the Dongying formation and its response to tectonic-paleogeomorphology in the block QHD29-2of the Bohai Bay basin.Marine Geology&Quaternary Geology,2011,31(6):47-54.
[15]石文龙,赖维成,魏刚等.渤海428构造围斜坡区构造—岩性油气藏成藏规律与勘探潜力分析.中国石油勘探,2012,17(2):22-26.Shi Wenlong,Lai Weicheng,Wei Gang et al.Hydrocarbon accumulation regulation and exploration potential analysis of structural-lithologic reservoir in slope zone of structure 428,Bohai basin.China Petroleum Exploration,2012,17(2):22-26.
[16]赖维成,滕玉波,加东辉等.对渤海海域隐蔽油气藏勘探的思考——以427构造带为例.中国海上油气,2007,19(2):73-78.Lai Weicheng,Teng Yubo,Jia Donghui et al.Thinking about the subtle reservoir exploration in Bohai sea:a case of 427structure belt.China Offshore Oil and Gas,2007,19(2):73-78.
[17]杨波,徐长贵,牛成民.墙角型陡坡带岩性圈闭油气成藏条件研究——以渤海湾盆地石南陡坡带中段BZ3区域古近系东营组为例.古地理学报,2011,13(4):434-442.Yang Bo,Xu Changgui,Niu Chengmin.Conditions for hydrocarbon reservoirs formation of lithologic trap in wallcorner-type steep slope belt:A case on the Paleogene Dongying Formation of BZ3block in middle part of Shinan steep slope belt,Bohai Bay Basin.Journal of Palaeogeography,2011,13(4):434-442.
[18]朱红涛,杨香华,周心怀等.基于地震资料的陆相湖盆物源通道特征分析:以渤中凹陷西斜坡东营组为例.地球科学,2013,38(1):121-129.Zhu Hongtao,Yang Xianghua,Zhou Xinhuai et al.Sediment transport pathway characteristics of continental lacustrine basins based on 3Dseismic data:Anexample from Dongying Formation of Western Slope of Bozhong Sag.Earth Science,2013,38(1):121-129.
[19]赵春明,胡景双,霍春亮等.曲流河与辫状河沉积砂体连通模式及开发特征——以渤海地区秦皇岛32-6油田为例.油气地质与采收率,2009,16(6):88-91.Zhao Chunming,Hu Jingshuang,Huo Chunliang et al.Sandbody interconnectivity architecture and development characteristics of meandering river and braided river deposits-a case study of Qinhuangdao 32-6Oilfield,Bohai area.Petroleum Geology and Recovery Efficiency,2009,16(6):88-91.
[20]王德英,余宏忠,于海波等.渤海海域新近系层序地层格架约束下岩性圈闭发育特征分析及精细刻画.中国海上油气,2012,24(增刊1):23-27.Wang Deying,Yu Hongzhong,Yu Haibo et al.An analysis and refined depiction of lithologic trap development under the framework of Neogene sequence stratigraphy in Bohai water:a case of Lower Member of Minghuazhen Formation in Shijiutuo rise.China Offshore Oil and Gas,2012,24(S1):23-27.
[21]揣媛媛,王德英,于海波等.石臼坨凸起新近系岩性圈闭识别与刻画关键技术.地球物理学进展,2013,28(1):365-372.Chuai Yuanyuan,Wang Deying,Yu Haibo et al.Research on the key technology of identification and description for lithologic traps in Neogene,Shijiutuo Uplift in Bohai.Progress in Geophysics,2013,28(1):365-372.
[22]徐尚,王英民,彭学超等.台湾峡谷的成因及其对沉积的控制.中国科学:地球科学,2014,44(9):913-1924.Xu Shang,Wang Yingmin,Peng Xuechao et al.Origin of Taiwan Canyon and its effects on deepwater sediment.Science China:Earth Sciences,2014,57(11):2769-2780.
[23]田立新,周东红,刘力辉.辽东湾蠕虫状地震反射的地质意义研究.石油物探,2010,49(3):295-298.Tian Lixin,Zhou Donghong,Liu Lihui.Research on geological significance of vermicular reflection in Liaodong Bay.GPP,2010,49(3):295-298.
[24]周东红,滕玉波,林桂康等.叠前反演技术在锦州31-6地区浊积扇砂体含油气性预测中的应用.中国石油勘探,2010,15(5):28-32.Zhou Donghong,Teng Yubo,Lin Guikang et al.Application of prestack inversion to prediction of hydrocarbon potential of turbidite sand bodies in Jinzhou31-6 Block.China Petroleum Exploration,2010,15(5):28-32.
[25]王建花,唐何兵,张良庆等.基于地震多属性分析的深层浊积扇刻画研究.西南石油大学学报,2012,34(2):54-64.Wang Jianhua,Tang Hebing,Zhang Liangqing et al.Study of deep layer turbidite fan detection based on the seismic multi-attribute analyses.Journal of Southwest Petroleum University(Science&Technology Edition),2012,34(2):54-64.
[26]李鹏,钱丽萍,石桥等.大庆高密度井网开发区地震解释技术的应用效果.石油地球物理勘探,2011,46(增刊1):106-110.Li Peng,Qian Liping,Shi Qiao et al.Seismic interpretation of development area with high density wells in Daqing.OGP,2011,46(S1):106-110.
[27]闫文华,陈宗翠,马喜梅等.煤层气地震解释技术应用及效果——以沁水盆地郑庄区块三维为例.石油地球物理勘探,2012,47(增刊1):66-71.Yan Wenhua,Chen Zongcui,Ma Ximei et al.3D seismic interpretation of coalbed methane in Zhengzhuang Block,Qinshui Basin.OGP,2012,47(S1):66-71.
[28]杨晓利,王童奎,柳晓风等.相控地震多属性预测技术在南堡凹陷碳酸盐岩储层的应用.地球物理学进展,2012,27(4):1565-1571.Yang Xiaoli,Wang Tongkui,Liu Xiaofeng et al.Applications of facies-controlled seismic multi-attribute prediction technology for reservoir in the burial hill of Nanpu.Progress in Geophysics,2012,27(4):1565-1571.
[29]张昕,甘利灯,刘文岭等.密井网条件下井震联合低级序断层识别方法.石油地球物理勘探,2012,47(3):462-468.Zhang Xin,Gan Lideng,Liu Wenling et al.Joint well-seismic interpretation of low-grade faults in dense well pattern block.OGP,2012,47(3):462-468.
[30]Hao Fang,Zhou Xinhuan,Zhu Yangming et al.Mechanisms for oil depletion and enrichment on the Shijiutuo uplift,Bohai bay basin,China.AAPG Bulletin,2009,93(8):1015-1037.