鄂尔多斯盆地南部地区延长组深水沉积构造特征及地质意义
|
摘要
鄂尔多斯盆地南部地区上三叠统延长组长7段发育有典型的重力流沉积。对野外露头剖面进行大量调查研究,发现研究区重力流沉积发育丰富的沉积构造,底层面构造、软沉积变形构造是主要的两种类型。这种深水沉积构造组合能够很好地揭示研究区广泛发育的一定坡度背景下深水重力流沉积体系。滑移-滑塌沉积、砂质碎屑流沉积、浊流沉积是研究区发育最为广泛的深水重力流沉积类型,滑移-滑塌及软沉积变形构造为触发机制沉积响应,底层面构造为砂质碎屑流沉积及浊流沉积响应。综合分析研究区地层发育的大量凝灰岩夹层、深水泥岩中发育的植物碎屑、深水砂岩中发育的大量浅黄色泥砾等沉积特征,认为地震、火山喷发及季节性洪水为研究区深水重力流沉积最有利的触发因素。
The Chang7 member of Yanchang Formation in the southern margin of Ordos Basin develops typical gravity flow deposits. It is found that the gravity flow deposits develop various sedimentary structures in the field investigation on field outcrops,mainly including bottom layer structures,soft-sediment deformation structures.These deep-water sedimentary structure combinations can well reveal that deep-water gravity flow deposits are widely developed under the background of slope breaks in the study area. Slip-slump deposits,sandy debris flow deposits and turbidite deposits are the most widely developed types of deep-water gravity flow deposits in the study area. Slip-slump structures and soft-sediment deformation structures are the sedimentary response of trig-gering mechanism,while bottom layer structures are the sedimentary response of sandy debris flow deposits and turbidite deposits. After the comprehensive analysis of characteristics of a large number of tuff interlayers,plant debris developed in deep-water mudstone,a large number of light yellow mud gravel developed in deep-water sandstone and other sedimentary characteristics of the formation in the study area,it is inferred that the earthquake,volcanic eruption and seasonal floods are the most advantageous triggering factors of deep-water gravity flow deposits in the study area.
The Chang7 member of Yanchang Formation in the southern margin of Ordos Basin develops typical gravity flow deposits. It is found that the gravity flow deposits develop various sedimentary structures in the field investigation on field outcrops,mainly including bottom layer structures,soft-sediment deformation structures.These deep-water sedimentary structure combinations can well reveal that deep-water gravity flow deposits are widely developed under the background of slope breaks in the study area. Slip-slump deposits,sandy debris flow deposits and turbidite deposits are the most widely developed types of deep-water gravity flow deposits in the study area. Slip-slump structures and soft-sediment deformation structures are the sedimentary response of trig-gering mechanism,while bottom layer structures are the sedimentary response of sandy debris flow deposits and turbidite deposits. After the comprehensive analysis of characteristics of a large number of tuff interlayers,plant debris developed in deep-water mudstone,a large number of light yellow mud gravel developed in deep-water sandstone and other sedimentary characteristics of the formation in the study area,it is inferred that the earthquake,volcanic eruption and seasonal floods are the most advantageous triggering factors of deep-water gravity flow deposits in the study area.
引文
[1]DALLA V G,GAMBERI F.Erosional sculpting of the Caprera confined deep-sea fan as a result of distal basin-spilling processes(eastern Sardinian margin,Tyrrhenian Sea)[J].Marine Geology,2010,268(1/4):55-66.
[2]BOURGET J,ZARAGOSI S,MULDER T,et al.Hyperpycnalfed turbidite lobe architecture and recent sedimentary processes:A case study from the Al Batha turbidite system,Oman margin[J].Sedimentary Geology,2010,229(3):144-159.
[3]TALLING P J,MASSON D G,SUMNER E J,et al.Subaqueous sediment density flows:Depositional processes and deposit types[J].Sedimentology,2012,59(7):1937-1953.
[4]SUMNER E J,TALLING P J,AMY L A.Facies architecture of individual basin-plain turbidites:Comparison with existing models and implications for flow processes[J].Sedimentology,2012,59(6):1850-1887.
[5]MIGEON S,DUCASSOU E,LE G Y,et al.Lobe construction and sand/mud segregation by turbidity currents and debris flows on the western Nile deep-sea fan(Eastern Mediterranean)[J].Sedimentary Geology,2010,229(3):124-143.
[6]KANE I A,PONTEN A S M.Submarine transitional flow deposits in the Paleogene Gulf of Mexico[J].Geology,2012,40(12):1119-1122.
[7]李文厚,邵磊,魏红红,等.西北地区湖相浊流沉积[J].西北大学学报,2001,31(1):57-62.
[8]郑荣才,文华国,韩永林.鄂尔多斯盆地白豹地区长6段湖底滑塌浊积扇沉积特征及其研究意义[J].成都理工大学学报,2006,33(6):566-575.
[9]夏青松,田景春.鄂尔多斯盆地西南部上三叠统长6段湖底扇特征[J].古地理学报,2007,9(1):33-43.
[10]傅强,吕苗苗,刘永斗.鄂尔多斯盆地晚三叠世湖盆浊积岩发育特征及地质意义[J].沉积学报,2008,26(2):186-192.
[11]邹才能,赵文智,张兴阳,等.大型敞流坳陷湖盆浅水三角洲与湖盆中心砂体的形成与分布[J].地质学报,2008,82(6):815-825.
[12]何自新,杨华,袁效奇,等.鄂尔多斯盆地地质剖面图集[M].北京:石油工业出版社,2004:1-6.
[13]何自新.鄂尔多斯盆地演化与油气[M].北京:石油工业出版社,2003:95-105.
[14]廖纪佳,朱筱敏,邓秀芹,等.鄂尔多斯盆地陇东地区延长组重力流特征及其模式[J].地学前缘,2013,20(2):29-39.
[15]闻金华,李文厚,李智超,等.旬邑地区三叠系长6—长7段沉积特征研究[J].重庆自然科技学报,2016,18(1):12-16.
[16]李祥辉,王成善,金玮.深海沉积理论发展及其在油气勘探中的意义[J].沉积学报,2009,27(1):77-84.
[17]付国民,赵俊兴,张志升,等.鄂尔多斯盆地东南缘三叠系延长组物源及沉积体系特征[J].矿物岩石,2010,30(1):99-105.
[18]杨仁超,何志亮,邱桂强,等.鄂尔多斯盆地南部晚三叠世重力流沉积体系[J].石油勘探与开发,2014,41(6):661-670.
[19]姜在兴.沉积学[M].北京:石油工业出版社,2010:55-75.
[20]朱筱敏.沉积岩石学[M].北京:石油工业出版社,2008:93-96.
[21]李勇,钟建华,邵珠福,等.软沉积变形构造的分类和形成机制研究[J].地质论评,2012,58(5):829-838.
[22]赵澂林,刘孟慧.湖相沉积岩中的同生变形构造及其地质意义[J].岩石学报,1988,22(4):149-155.
[23]杜远生.中国地震事件沉积研究的若干问题探讨[J].古地理学报,2011,13(6):581-590.
[24]杨华,邓秀芹.构造事件对鄂尔多斯盆地延长组深水砂岩沉积的影响[J].石油勘探与开发,2013,40(5):513-520.
[25]邓秀芹,蔺昉晓,刘显阳,等.鄂尔多斯盆地三叠系延长组沉积演化及其与早印支运动关系的探讨[J].古地理学报,2008,10(2):159-166.
[26]陈飞,胡光义,孙立春,等.鄂尔多斯盆地南部上三叠统延长组层序地层格架内沉积相特征与演化[J].古地理学报,2012,14(3):321-330.
[27]杨华,刘显阳,张才利,等.鄂尔多斯盆地三叠系延长组低渗透岩性油藏主控因素及其分布规律[J].岩性油气藏,2007,19(3):1-6.
[2]BOURGET J,ZARAGOSI S,MULDER T,et al.Hyperpycnalfed turbidite lobe architecture and recent sedimentary processes:A case study from the Al Batha turbidite system,Oman margin[J].Sedimentary Geology,2010,229(3):144-159.
[3]TALLING P J,MASSON D G,SUMNER E J,et al.Subaqueous sediment density flows:Depositional processes and deposit types[J].Sedimentology,2012,59(7):1937-1953.
[4]SUMNER E J,TALLING P J,AMY L A.Facies architecture of individual basin-plain turbidites:Comparison with existing models and implications for flow processes[J].Sedimentology,2012,59(6):1850-1887.
[5]MIGEON S,DUCASSOU E,LE G Y,et al.Lobe construction and sand/mud segregation by turbidity currents and debris flows on the western Nile deep-sea fan(Eastern Mediterranean)[J].Sedimentary Geology,2010,229(3):124-143.
[6]KANE I A,PONTEN A S M.Submarine transitional flow deposits in the Paleogene Gulf of Mexico[J].Geology,2012,40(12):1119-1122.
[7]李文厚,邵磊,魏红红,等.西北地区湖相浊流沉积[J].西北大学学报,2001,31(1):57-62.
[8]郑荣才,文华国,韩永林.鄂尔多斯盆地白豹地区长6段湖底滑塌浊积扇沉积特征及其研究意义[J].成都理工大学学报,2006,33(6):566-575.
[9]夏青松,田景春.鄂尔多斯盆地西南部上三叠统长6段湖底扇特征[J].古地理学报,2007,9(1):33-43.
[10]傅强,吕苗苗,刘永斗.鄂尔多斯盆地晚三叠世湖盆浊积岩发育特征及地质意义[J].沉积学报,2008,26(2):186-192.
[11]邹才能,赵文智,张兴阳,等.大型敞流坳陷湖盆浅水三角洲与湖盆中心砂体的形成与分布[J].地质学报,2008,82(6):815-825.
[12]何自新,杨华,袁效奇,等.鄂尔多斯盆地地质剖面图集[M].北京:石油工业出版社,2004:1-6.
[13]何自新.鄂尔多斯盆地演化与油气[M].北京:石油工业出版社,2003:95-105.
[14]廖纪佳,朱筱敏,邓秀芹,等.鄂尔多斯盆地陇东地区延长组重力流特征及其模式[J].地学前缘,2013,20(2):29-39.
[15]闻金华,李文厚,李智超,等.旬邑地区三叠系长6—长7段沉积特征研究[J].重庆自然科技学报,2016,18(1):12-16.
[16]李祥辉,王成善,金玮.深海沉积理论发展及其在油气勘探中的意义[J].沉积学报,2009,27(1):77-84.
[17]付国民,赵俊兴,张志升,等.鄂尔多斯盆地东南缘三叠系延长组物源及沉积体系特征[J].矿物岩石,2010,30(1):99-105.
[18]杨仁超,何志亮,邱桂强,等.鄂尔多斯盆地南部晚三叠世重力流沉积体系[J].石油勘探与开发,2014,41(6):661-670.
[19]姜在兴.沉积学[M].北京:石油工业出版社,2010:55-75.
[20]朱筱敏.沉积岩石学[M].北京:石油工业出版社,2008:93-96.
[21]李勇,钟建华,邵珠福,等.软沉积变形构造的分类和形成机制研究[J].地质论评,2012,58(5):829-838.
[22]赵澂林,刘孟慧.湖相沉积岩中的同生变形构造及其地质意义[J].岩石学报,1988,22(4):149-155.
[23]杜远生.中国地震事件沉积研究的若干问题探讨[J].古地理学报,2011,13(6):581-590.
[24]杨华,邓秀芹.构造事件对鄂尔多斯盆地延长组深水砂岩沉积的影响[J].石油勘探与开发,2013,40(5):513-520.
[25]邓秀芹,蔺昉晓,刘显阳,等.鄂尔多斯盆地三叠系延长组沉积演化及其与早印支运动关系的探讨[J].古地理学报,2008,10(2):159-166.
[26]陈飞,胡光义,孙立春,等.鄂尔多斯盆地南部上三叠统延长组层序地层格架内沉积相特征与演化[J].古地理学报,2012,14(3):321-330.
[27]杨华,刘显阳,张才利,等.鄂尔多斯盆地三叠系延长组低渗透岩性油藏主控因素及其分布规律[J].岩性油气藏,2007,19(3):1-6.