四川盆地下组合张性构造特征
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摘要
四川盆地拉张断裂在地震资料中的识别研究,印证了晚元古-早古生代盆地处于张性构造作用环境。结合川中地区新老探井地层对比,提出存在早寒武世拉张槽的观点。使用四川盆地钻至寒武系和震旦系的探井约束解释覆盖全盆地的二维、三维地震资料后,以下寒武统麦地坪组、筇竹寺组和沧浪铺组3套地层总厚度展布特征,揭示了拉张槽在平面上为近南北走向;确定了四川盆地早寒武世拉张槽两侧边界(断裂)东陡西缓的特征,中段呈箕状拗陷构造形态。以其展布中线区域,命名为绵阳-乐至-隆昌-长宁拉张槽。
The study and identification of the extensional structures in the pre-Sinian to Cambrian strata confirm the extensional tectonic setting during the late Proterozoic-early Palaeozoic in Sichuan Basin.The paper proposes the view of the existence of the Early Cambrian Mianyang-LezhiLongchang-Changning intracratonic sag by interpreting the drilling well information and seismic profiles.In the section,the Early Cambrian intracratonic sag possesses the general characteristics of half-graben.Its boundaries are steep on the east side and relatively gentle on the west side.The east steep boundary is more obvious in the middle segment of the sag,and weak in the north and south segments.On the plane,the distribution of the thickness of Lower Cambrian Canglangpu,Qiongzhusi and Maidiping Formations shows that the sag is wide in the north and south segments,and narrow in the middle segment.The determination of the early Cambrian intracratonic sag is of great importance to the petroleum exploration in Sichuan Basin.
The study and identification of the extensional structures in the pre-Sinian to Cambrian strata confirm the extensional tectonic setting during the late Proterozoic-early Palaeozoic in Sichuan Basin.The paper proposes the view of the existence of the Early Cambrian Mianyang-LezhiLongchang-Changning intracratonic sag by interpreting the drilling well information and seismic profiles.In the section,the Early Cambrian intracratonic sag possesses the general characteristics of half-graben.Its boundaries are steep on the east side and relatively gentle on the west side.The east steep boundary is more obvious in the middle segment of the sag,and weak in the north and south segments.On the plane,the distribution of the thickness of Lower Cambrian Canglangpu,Qiongzhusi and Maidiping Formations shows that the sag is wide in the north and south segments,and narrow in the middle segment.The determination of the early Cambrian intracratonic sag is of great importance to the petroleum exploration in Sichuan Basin.
引文
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[14]张健,沈平,杨威,等.四川盆地前震旦纪沉积岩新认识与油气勘探的意义[J].天然气工业,2012,32(7):1 -5.Zhang J,Shen P,Yang W,et al.New understandings of pre-Sinian sedimentary rocks in the Sichuan Basin and the significance of oil and gas exploration there[J].Natural Gas Industry,2012,32(7):1-5 .(In Chinese)
[15]罗志立.试从地裂运动探讨四川盆地天然气勘探的新领域[J].成都地质学院学报,1983(2):1-13.Luo Z L.A discussion of new prospects for gas field exploration related to the taphrogenic movement in Sichuan Basin[J].Journal of Chengdu College of Geology,1983(2):1-13.(In Chinese)
[16]罗志立,刘顺,徐世琦.四川盆地震旦系含气层中有利勘探区块的选择[J].石油学报,1998,19(4):1-7 .Luo Z L,Liu S,Xu S Q.Selection of favorable area of exploration in Sinian bearing gas formation of Sichuan Basin[J].Acta Petrolei Sinica,1998,19(4):1 -7.(In Chinese)
[17]刘树根,秦川,孙玮,等.四川盆地震旦系灯影组油气四中心耦合成藏过程[J].岩石学报,2012,28(3):879 -888.Liu S G,Qin C,Sun W,et al.The coupling formation process of four centers of hydrocarbon in Sinian Dengying Formation of Sichuan Basin[J].Acta Petrologica Sinica,2012,28(3):879-888.(In Chinese)
[18]罗志立,赵锡奎,刘树根,等.“中国地裂运动观”的创建和发展[J].石油实验地质,2001,23(2):233-240 .Luo Z L,Zhao X K,Liu S G,et al.Establishment and development of“Chinese Taphrogeny Outlook”[J].Petroleum Geology&Experiment,2001,23(2):233-240.(In Chines)
[2]Janecke S U,Vanderburg C J,Blankenau J J.Geometry,mechanism,and significance of extensional folds from examples in the Rocky Mountain Basin and Range province,U.S.A.[J].Journal of Structural Geology,1998,20(7):841-856.
[3]Walsh J J,Watterson J.Distributions of cumulative displacement and seismic slip on a single normal fault surface[J].Journal of Structural Geology,1987,10:1039-1046.
[4]Morley C K,Nelson R A,Patton T L,et al.Transfer zones in the East African rift system and their relevance to hydrocarbon exploration in rifts[J].AAPG Bulletin,1990,74(8):1234-1253.
[5]Peacock D C P,Sandersond J.Geometry and development of relay ramps in normal fault systems[J].AAPG Bulletin,1994,78(2):147-165.
[6]Gupta A,Scholz C H.A model of normal fault interaction based on observations and theory[J].Journal of Structural Geology,2000,22(7):865-879.
[7]陈竹新,贾东,魏国齐,等.川西前陆盆地南段薄皮冲断构造之下隐伏裂谷盆地及其油气地质意义[J].石油与天然气地质,2006,27(4):460-466.Chen Z X,Jia D,Wei G Q,et al.Buried rift basins under the thin-skinned fold-thrust belts in the south segment of the western Sichuan foreland basin and their geological significance[J].Oil&Gas Geology,2006,27(4):460-466.(In Chinese)
[8]黄汲清,任纪舜,姜春发,等.中国大地构造及其演化[M].北京:科学出版社,1980.Huang J Q,Ren J S,Jiang C F,et al.Geotectonic Evolution of China[M].Beijing:Science Press,1980.(In Chinese)
[9]罗志立.略论地裂运动与中国油气分布[J].中国地质科学学院院报,1984(10):93-101.Luo Z L.A discussion of taphrogenesis and hydrocarbon distribution in China[J].Bulletin of the Chinese Academy of Geological Sciences,1984(10):93-101.(In Chinese)
[10]刘鸿允,胡华光,胡世玲,等.从Rb-Sr及K-Ar年龄测定讨论某些前寒武系及中生代火山岩地层的时代[J].地质科学,1981(4):303-313.Liu H Y,Hu G H,Hu S L,et al.Discussion on ages of some precambrian rocks and Mesozoic volcanic series from Rb-Sr and K-Ar data[J].Chinese Journal of Geology,1981(4):303-313.(In Chinese)
[11]孙玮,罗志立,刘树根,等.华南古板块兴凯地裂运动特征及对油气影响[J].西南石油大学学报:自然科学版,2011,33(5):1-8.Sun W,Luo Z L,Liu S G,et al.Characteristics of Xinkai Taphrogenesis in South China and the effects on oil and gas[J].Journal of Southwest Petroleum University(Science&Technology Edition),2011,33 (5):1-8.(In Chinese)
[12]徐世琦,张光荣,李国辉,等.加里东古隆起震旦系的烃源条件[J].成都理工学院学报,2000,27(增刊):132 -138.Xu S Q,Zhang G R,Li G H,et al.The hydrocarbon source condition of Sinian System of the Caledonian palaeo-uplift[J].Journal of Chengdu University of Technology,2000,27(Supplement):132-138.(In Chinese)
[13]杨家静.四川盆地乐山-龙女寺古隆起震旦系油气藏形成演化研究[D].成都:西南石油大学档案馆,2002.Yang J J.Study on Formation and Evolution of Sinian Petroleum Pools in Leshan-Longnvsi Paleo-uplift,Sichuan Basin[D].Chengdu:The Archive of Southwest Petroleum University,2002.(In Chinese)
[14]张健,沈平,杨威,等.四川盆地前震旦纪沉积岩新认识与油气勘探的意义[J].天然气工业,2012,32(7):1 -5.Zhang J,Shen P,Yang W,et al.New understandings of pre-Sinian sedimentary rocks in the Sichuan Basin and the significance of oil and gas exploration there[J].Natural Gas Industry,2012,32(7):1-5 .(In Chinese)
[15]罗志立.试从地裂运动探讨四川盆地天然气勘探的新领域[J].成都地质学院学报,1983(2):1-13.Luo Z L.A discussion of new prospects for gas field exploration related to the taphrogenic movement in Sichuan Basin[J].Journal of Chengdu College of Geology,1983(2):1-13.(In Chinese)
[16]罗志立,刘顺,徐世琦.四川盆地震旦系含气层中有利勘探区块的选择[J].石油学报,1998,19(4):1-7 .Luo Z L,Liu S,Xu S Q.Selection of favorable area of exploration in Sinian bearing gas formation of Sichuan Basin[J].Acta Petrolei Sinica,1998,19(4):1 -7.(In Chinese)
[17]刘树根,秦川,孙玮,等.四川盆地震旦系灯影组油气四中心耦合成藏过程[J].岩石学报,2012,28(3):879 -888.Liu S G,Qin C,Sun W,et al.The coupling formation process of four centers of hydrocarbon in Sinian Dengying Formation of Sichuan Basin[J].Acta Petrologica Sinica,2012,28(3):879-888.(In Chinese)
[18]罗志立,赵锡奎,刘树根,等.“中国地裂运动观”的创建和发展[J].石油实验地质,2001,23(2):233-240 .Luo Z L,Zhao X K,Liu S G,et al.Establishment and development of“Chinese Taphrogeny Outlook”[J].Petroleum Geology&Experiment,2001,23(2):233-240.(In Chines)
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