鄂尔多斯盆地姬塬-元城地区构造裂缝特征与形成期次的划分
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摘要
通过分析鄂尔多斯盆地姬塬-元城地区野外地质露头与井下裂缝特征,结合构造应力场背景分析,获得以下认识:1)该区构造裂缝以斜交于最大主应力的单条裂缝为主,尤其以SWW-NEE或近EW向裂缝和NNE-SSW或近S-N向裂缝较为发育,并发育少量对应的NW-SE和NE-SW向共轭裂缝。2)根据露头区裂缝系统的切割关系,NE向和近S-N向延伸的裂缝为后期发育,NW向和NEE向延伸的裂缝为早期发育;3)燕山期北西-南东向压应力场背景下,早白垩世末构造抬升造成的主应力差是早期共轭裂缝形成的主要原因;喜山期区域北东-南西应力挤压是后一期延伸裂缝的主要原因。
The development of structural fractures changes the mechanical properties of the reservoir rock,directly affecting the efficiency of dense reservoir exploration and development.Therefore,the development characteristics of the fractures is of very important theoretical significance and practical value.We analyze the characteristics of the fracture from geological outcrop and the underground in the Jiyuan-Yuancheng area of the Ordos basin,and combine the tectonic stress field background getting the following results in this paper:(1)the structural fracture is given priority oblique to the maximum principal stress of a single fracture,with the trend of SWW-NEE or nearly E-W and NNE-SSW or nearly S-N,and a small amount of the corresponding conjugate fracture NW-SE and NE-SW fracture develops;(2)according to the cutting relationship between the fracture system in the outcrop area,the trends of NE-SW and nearly S-N latter develop,and SWW-NEE or nearly E-W fracture develop early;(3)in the background of pressure stress field in the north west and south east of Yanshan period,the principal stress difference caused by the early cretaceous tectonic uplift is the main reason for the formation of early conjugate fractures.The stress extrusion of north east-south west in the Himalayaperiod is the main reason for the fracture.
The development of structural fractures changes the mechanical properties of the reservoir rock,directly affecting the efficiency of dense reservoir exploration and development.Therefore,the development characteristics of the fractures is of very important theoretical significance and practical value.We analyze the characteristics of the fracture from geological outcrop and the underground in the Jiyuan-Yuancheng area of the Ordos basin,and combine the tectonic stress field background getting the following results in this paper:(1)the structural fracture is given priority oblique to the maximum principal stress of a single fracture,with the trend of SWW-NEE or nearly E-W and NNE-SSW or nearly S-N,and a small amount of the corresponding conjugate fracture NW-SE and NE-SW fracture develops;(2)according to the cutting relationship between the fracture system in the outcrop area,the trends of NE-SW and nearly S-N latter develop,and SWW-NEE or nearly E-W fracture develop early;(3)in the background of pressure stress field in the north west and south east of Yanshan period,the principal stress difference caused by the early cretaceous tectonic uplift is the main reason for the formation of early conjugate fractures.The stress extrusion of north east-south west in the Himalayaperiod is the main reason for the fracture.
引文
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[12]周新桂,张林炎,范昆,等.安塞沿河湾、吴旗地区长6储层裂缝特征及其分布规律研究[R].中国石油长庆油田公司,2006(Zhou Xingui,Zhang Linyan,Fan Kun,et al.The Fracture Characteristics and Distribution of the Chang6 Reservoirsin Yanhewan,Wuqi Area of Anshai[R].Changqing Petroleum Oilfield Company,2006)
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[14]冯娟萍,欧阳征健,黄正良.平衡地质剖面技术在鄂尔多斯盆地西缘中南段中的应用[J].大地构造与成矿学,2013,37(3):393-397(Feng Juanping,Ouyang Zhengjian,Huang Zhengliang.The Application of Balance Geological Section Technology in the Mid-South Section of the Western Margin of the Ordos Basin[J].Geotectonica et Metallogenia,2013,37(3):393-397)
[15]赵红格,刘池洋,翁望飞,等.新近纪鄂尔多斯盆地东西部的构造反转及其意义[J].石油学报,2007,28(6):6-11(Zhao Hongge,Liu Chiyang,Weng Wangfei,et al.Structural Reverse and Its Significance to Oil and Gas in the East and West Parts of Ordos Basin in the Neogene[J].Acta Petrolei Sinica,2007,28(6):6-11)
[16]陈刚,孙建博,周立发,等.鄂尔多斯盆地西南缘中生代构造事件的裂变径迹年龄记录[J].中国科学D辑:地球科学,2007(增1):110-118(Chen Gang,Sun Jianbo,Zhou Lifa,et al.Tectonic Events in Southwestern Margin of Ordos Basin in Mesozoic Using Fission Track Dating[J].Science in China Series D:Earth Sciences,2007,37(S1):110-118)
[2]党犇,赵虹,付金华,等.鄂尔多斯盆地沉积盖层构造裂缝特征研究[J].天然气工业,2005,25(7):14-16(Dang Ben,Zhao Hong,Fu Jinhua,et al.Characteristics of Structural Fractures in Sedimentary Strata of E’Erduosi Basin[J];Natural Gas Industry,2005,25(7):14-16)
[3]曾联波,李忠兴,史成恩,等.鄂尔多斯盆地上三叠统延长组特低渗透砂岩储层裂缝特征及成因[J].地质学报,2007,81(2):174-180(Zeng Lianbo,Li Zhongxing,Shi Chengen,et al.Characteristics and Origin of Fractures in the Extra Low-Permeability Sandstone Reservoirs of the Upper Triassic Yanchang Formation in the Ordos Basin[J].Acta Geologica Sinica;2007,81(2):174-180)
[4]付金华,李士祥,刘显阳,等.鄂尔多斯盆地姬塬大油田多层系复合成藏机理及勘探意义[J].中国石油勘探,2013(5):1-9(Fu Jinhua,Li Shixiang,Liu Xianyang,et al.Multi-Layer Composite Accumulation Mechanism and Exploration Significance of Jiyuan Oilfield,Ordos Basin[J].China Petroleum Exploration,2013,18(5):1-9)
[5]张仲培,王清晨.库车坳陷节理和剪切破裂发育特征及其对区域应力场转换的指示[J].中国科学D辑:地球科学,2004,34(增1):63-73(Zhang Zhongpei,Wang Qingchen,Development of Joints and Shear Fractures in Kuqa Depression and Its Implication to Regional Stress Field Switching[J].Science in China Series D:Earth Sciences,2004,34(S1):63-73)
[6]Yang M,Li L,Zhou J,et al.Segmentation and Inversion of the Hangjinqi Fault Zone,the Northern Ordos Basin(North China)[J].Journal of Asian Earth Sciences,2013,70-71(1):64-78)
[7]Ritts B D,Darby B J,Cope T.Early Jurassic Extensional Basin Formation in the Daqing Shan Segment of the Yinshan Belt,Northern North China Block,Inner Mongolia[J].Tectonophysics,2001,339(3-4):239-258)
[8]Ye H M,Mao J R,Zhao X L,et al.Revisiting Early-Middle Jurassic Igneous Activity in the Nanling Mountains,South China:Geochemistry and Implications for Regional Geodynamics[J].Journal of Asian Earth Sciences,2013,72(4):108-117
[9]Li X,Liu H,Wan Y,et al.Tectonic Evolution of the Tianhuan Depression and the Western Margin of the Late Triassic Ordos[J].Acta Geologica Sinica,2009,83(6):1 136-1 147
[10]赵红格.鄂尔多斯盆地西部构造特征及演化[D].西安:西北大学,2003(Zhao Hongge.Structural Characteristics and the Evolution in Western Ordos Basin[D].Xi’an:Northwest University,2003)
[11]贺晓.鄂尔多斯盆地姬塬-元城地区上三叠统裂缝发育特征及形成机理研究[D].西安:西北大学,2009(He Xiao.Study on the Character of Fracture Development and the Mechanism of Fracture Formation of Upper Triassic in Jiyuan-Yuancheng Area of Ordos Basin[D].Xi’an:Northwest University,2009)
[12]周新桂,张林炎,范昆,等.安塞沿河湾、吴旗地区长6储层裂缝特征及其分布规律研究[R].中国石油长庆油田公司,2006(Zhou Xingui,Zhang Linyan,Fan Kun,et al.The Fracture Characteristics and Distribution of the Chang6 Reservoirsin Yanhewan,Wuqi Area of Anshai[R].Changqing Petroleum Oilfield Company,2006)
[13]刘岩.低渗储层裂缝特征及其对油气富集的控制作用[D].成都:成都理工大学,2013(Liu Yan.Fracture Charactteristics of Low Permeability Reserviors and the control action of the Accumulation of Oil and Gas[D].Chengdu:Chengdu University of Technology,2013)
[14]冯娟萍,欧阳征健,黄正良.平衡地质剖面技术在鄂尔多斯盆地西缘中南段中的应用[J].大地构造与成矿学,2013,37(3):393-397(Feng Juanping,Ouyang Zhengjian,Huang Zhengliang.The Application of Balance Geological Section Technology in the Mid-South Section of the Western Margin of the Ordos Basin[J].Geotectonica et Metallogenia,2013,37(3):393-397)
[15]赵红格,刘池洋,翁望飞,等.新近纪鄂尔多斯盆地东西部的构造反转及其意义[J].石油学报,2007,28(6):6-11(Zhao Hongge,Liu Chiyang,Weng Wangfei,et al.Structural Reverse and Its Significance to Oil and Gas in the East and West Parts of Ordos Basin in the Neogene[J].Acta Petrolei Sinica,2007,28(6):6-11)
[16]陈刚,孙建博,周立发,等.鄂尔多斯盆地西南缘中生代构造事件的裂变径迹年龄记录[J].中国科学D辑:地球科学,2007(增1):110-118(Chen Gang,Sun Jianbo,Zhou Lifa,et al.Tectonic Events in Southwestern Margin of Ordos Basin in Mesozoic Using Fission Track Dating[J].Science in China Series D:Earth Sciences,2007,37(S1):110-118)