东濮凹陷沙三段盐岩成因
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摘要
东濮凹陷沙三段(Es3)发育盐岩和膏盐岩,岩心观察见有冲刷面、泥裂、波痕等浅水和暴露标志,地震剖面显示有低位楔、削截面、下超等湖岸线进退现象,说明Es3沉积期古湖泊水体深度变化大。高水位期沉积深灰色、暗色泥岩与少量重力流砂体,低水位期沉积盐岩、膏岩,发育低位三角洲与扇三角洲沉积,纵向形成深湖泥岩与蒸发岩、低位砂岩的频繁互层。分析认为,盐岩为浅水成因,盐源为周边隆起的中、下奥陶统。这一认识不同于过去“高山深盆”、“深水成盐”和“海相成因”的观点,将给东濮凹陷沉积古地理、古环境研究带来新的认识。图6表3参13
In Dongpu Sag,red sediments can be found within the salt-gypsum developed in 3~(rd) Member of Shahejie Formation(Es_(3)). Shallow-water and exposed signs are also found as scour surfaces,mud cracks and ripple marks in the cores.Lakeshore on-off signs of lowstand wedge,truncation and downlap are recognized from seismic profiles.These indicate that the water depth of paleolake changed during the deposition of Es_(3).Deep-grey and dark mudstones and a few gravity sandbodies developed in the highstand period, while salt rock,gypsum rock,lowstand deltas and fan deltas developed in the lowstand period.As a result,deep lake mudstones are interbedded with evaporites and lowstand sandbodies.The paper argues that the salt rocks are deposited in shallow water,the salt comes from the Lower-Middle Ordovician series of the surrounding uplifts.This argument is different from the past theories of "high mountain deep lake","salt deposited in deep water" and "salt deposited in marine facies".
In Dongpu Sag,red sediments can be found within the salt-gypsum developed in 3~(rd) Member of Shahejie Formation(Es_(3)). Shallow-water and exposed signs are also found as scour surfaces,mud cracks and ripple marks in the cores.Lakeshore on-off signs of lowstand wedge,truncation and downlap are recognized from seismic profiles.These indicate that the water depth of paleolake changed during the deposition of Es_(3).Deep-grey and dark mudstones and a few gravity sandbodies developed in the highstand period, while salt rock,gypsum rock,lowstand deltas and fan deltas developed in the lowstand period.As a result,deep lake mudstones are interbedded with evaporites and lowstand sandbodies.The paper argues that the salt rocks are deposited in shallow water,the salt comes from the Lower-Middle Ordovician series of the surrounding uplifts.This argument is different from the past theories of "high mountain deep lake","salt deposited in deep water" and "salt deposited in marine facies".
引文
[1]陈发亮,朱晖,李绪涛,等.东濮凹陷下第三系沙河街组层序地层划分及岩盐成因探讨[J].沉积学报,2000,18(3):384-388.(CHEN Fa-liang,ZHU Hui,LI Xu-tao,et al.Partition ofsequence strata and discussion about salt-rock resource in Shahejieformation of Eogene in Dongpu Depression[J].ActaSedimentologica Sinica,2000,18(3):384-388.)
[2]金强,黄醒汉.东濮凹陷早第三纪盐湖成因的探讨———一种深水成因模式[J].华东石油学院学报(自然科学版),1985,9(1):1-13.(JIN Qiang,HUANG Xing-han.Studies on the origin of theearly Tertiary salt lake Dongpu Depression:a postulated deepwater model[J].Journal of East China Petroleum Institute(Natural Science Edition),1985,9(1):1-13.)
[3]顾家裕.陆相湖盆层序地层学模式[J].石油勘探与开发,1995,22(4):12-17.(GU Jia-yu.The sequence stratigraphic model ofterrestial lacustrine basin[J].Petroleum Exploration andDevelopment,1995,22(4):12-17.)
[4]李任伟,辛茂安.东濮盆地沉积岩的成因[J].沉积学报,1989,7(4):141-147.(LI Ren-wei,XIN Mao-an.The origin ofsedimentary rock in Dongpu Basin[J].Acta SedimentologicaSinica,1989,7(4):141-147.)
[5]张建军,李志,刘贤武.东濮凹陷沙河街组盐岩成因研究[J].断块油气田,1998,5(5):18-22.(ZHANG Jian-jun,LI Zhi,LIUXian-wu.The study of genetic salt sedimentary in DongpuDepression[J].Fault-Block Oil&Gas Field,1998,5(5):18-22.)
[6]任来义,林桂芳,赵志清.东濮凹陷早第三纪的海侵(泛)事件[J].古生物学报,2000,39(4):553-557.(REN Lai-yi,LIN Gui-fang,ZHAO Zhi-qing.Early Tertiary marine transgression in DongpuDepression[J].Acta Palaeontologica Sinica,2000,39(4):553-557.)
[7]任来义,林桂芳,谈玉明,等.从古生物和地球化学标志看东濮凹陷早第三纪的海侵事件[J].西安石油学院学报(自然科学版),2002,1(1):20-23.(REN Lai-yi,LIN Gui-fang,TAN Yu-ming,et al.Studying marine transgression of Early Tertiary in DongpuDepression from Paleontologic and Geochemical Marks[J].Journal of Xi’an Petroleum Institute(Natural Science Edition),2002,1(1):20-23.)
[8]王秀林,张孝义.东濮凹陷盐岩成因与油气聚集[J].大庆石油地质与开发,2002,10(5):11-12.(WANG Xiu-lin,ZHANG Xiao-yi.Discussion on genesis of halites and petroleum accumulation inDongpu Depression[J].Petroleum Geology&OilfieldDevelopment in Daqing,2002,10(5):11-12.)
[9]纪友亮,冯建辉,王声朗,等.东濮凹陷沙三段高频湖平面变化及低位砂体预测[J].高校地质学报,2003,3(1):99-110.(JI You-liang,FENG Jian-hui,WANG Sheng-lang,et al.High frequencelake level change of 3rdmember of Shahejie Formation andprediction of lowstand sand body in Dongpu Depression[J].Geological Journal of China Universities,2003,3(1):99-110.)
[10]杨香华,陈开远,石万忠,等.东濮凹陷盐湖层序结构与隐蔽油气藏[J].石油与天然气地质,2002,6(2):140-142.(YANG Xiang-hua,CHEN Kai-yuan,SHI Wan-zhong,et al.Saline lakesequence structure of Dongpu Depresssion and subtle reservoir[J].Oil&Gas Geology,2002,6(2):140-142.)
[11]王生郎,任来义,王英,等.盐湖环境成盐作用特征及其对高孔隙带形成的影响[J].石油勘探与开发,2003,30(5):47-49.(WANGSheng-lang,REN Lai-yi,WANG Ying,et al.Characteristics ofdiagenesis saline lake environment and its effect on high-porosityzones[J].Petroleum Exploration and Development,2003,30(5):47-49.)
[12]宫秀梅,曾溅辉.渤南洼陷古近系膏盐层对深层油气成藏的影响[J].石油勘探与开发,2003,30(5):24-27.(GONG Xiu-mei,ZENG Jian-hui.Impact of paleogene evaporates on hydrocarbonaccumulation in deep Bonan Sub-sag,Jiyang Depression[J].Petroleum Exploration and Development,2003,30(5):24-27.)
[13]史忠生,陈开远,史军,等.东濮凹陷古近系硫酸盐硫同位素组成及地质意义[J].石油勘探与开发,2004,31(6):44-46.(SHIZhong-sheng,CHEN Kai-yuan,SHI Jun,et al.Sulfur isotopiccomposition and its geological significance of the paleogene sulfaterock deposited in Dongpu Depression[J].Petroleum Explorationand Development,2004,31(6):44-46.)
[2]金强,黄醒汉.东濮凹陷早第三纪盐湖成因的探讨———一种深水成因模式[J].华东石油学院学报(自然科学版),1985,9(1):1-13.(JIN Qiang,HUANG Xing-han.Studies on the origin of theearly Tertiary salt lake Dongpu Depression:a postulated deepwater model[J].Journal of East China Petroleum Institute(Natural Science Edition),1985,9(1):1-13.)
[3]顾家裕.陆相湖盆层序地层学模式[J].石油勘探与开发,1995,22(4):12-17.(GU Jia-yu.The sequence stratigraphic model ofterrestial lacustrine basin[J].Petroleum Exploration andDevelopment,1995,22(4):12-17.)
[4]李任伟,辛茂安.东濮盆地沉积岩的成因[J].沉积学报,1989,7(4):141-147.(LI Ren-wei,XIN Mao-an.The origin ofsedimentary rock in Dongpu Basin[J].Acta SedimentologicaSinica,1989,7(4):141-147.)
[5]张建军,李志,刘贤武.东濮凹陷沙河街组盐岩成因研究[J].断块油气田,1998,5(5):18-22.(ZHANG Jian-jun,LI Zhi,LIUXian-wu.The study of genetic salt sedimentary in DongpuDepression[J].Fault-Block Oil&Gas Field,1998,5(5):18-22.)
[6]任来义,林桂芳,赵志清.东濮凹陷早第三纪的海侵(泛)事件[J].古生物学报,2000,39(4):553-557.(REN Lai-yi,LIN Gui-fang,ZHAO Zhi-qing.Early Tertiary marine transgression in DongpuDepression[J].Acta Palaeontologica Sinica,2000,39(4):553-557.)
[7]任来义,林桂芳,谈玉明,等.从古生物和地球化学标志看东濮凹陷早第三纪的海侵事件[J].西安石油学院学报(自然科学版),2002,1(1):20-23.(REN Lai-yi,LIN Gui-fang,TAN Yu-ming,et al.Studying marine transgression of Early Tertiary in DongpuDepression from Paleontologic and Geochemical Marks[J].Journal of Xi’an Petroleum Institute(Natural Science Edition),2002,1(1):20-23.)
[8]王秀林,张孝义.东濮凹陷盐岩成因与油气聚集[J].大庆石油地质与开发,2002,10(5):11-12.(WANG Xiu-lin,ZHANG Xiao-yi.Discussion on genesis of halites and petroleum accumulation inDongpu Depression[J].Petroleum Geology&OilfieldDevelopment in Daqing,2002,10(5):11-12.)
[9]纪友亮,冯建辉,王声朗,等.东濮凹陷沙三段高频湖平面变化及低位砂体预测[J].高校地质学报,2003,3(1):99-110.(JI You-liang,FENG Jian-hui,WANG Sheng-lang,et al.High frequencelake level change of 3rdmember of Shahejie Formation andprediction of lowstand sand body in Dongpu Depression[J].Geological Journal of China Universities,2003,3(1):99-110.)
[10]杨香华,陈开远,石万忠,等.东濮凹陷盐湖层序结构与隐蔽油气藏[J].石油与天然气地质,2002,6(2):140-142.(YANG Xiang-hua,CHEN Kai-yuan,SHI Wan-zhong,et al.Saline lakesequence structure of Dongpu Depresssion and subtle reservoir[J].Oil&Gas Geology,2002,6(2):140-142.)
[11]王生郎,任来义,王英,等.盐湖环境成盐作用特征及其对高孔隙带形成的影响[J].石油勘探与开发,2003,30(5):47-49.(WANGSheng-lang,REN Lai-yi,WANG Ying,et al.Characteristics ofdiagenesis saline lake environment and its effect on high-porosityzones[J].Petroleum Exploration and Development,2003,30(5):47-49.)
[12]宫秀梅,曾溅辉.渤南洼陷古近系膏盐层对深层油气成藏的影响[J].石油勘探与开发,2003,30(5):24-27.(GONG Xiu-mei,ZENG Jian-hui.Impact of paleogene evaporates on hydrocarbonaccumulation in deep Bonan Sub-sag,Jiyang Depression[J].Petroleum Exploration and Development,2003,30(5):24-27.)
[13]史忠生,陈开远,史军,等.东濮凹陷古近系硫酸盐硫同位素组成及地质意义[J].石油勘探与开发,2004,31(6):44-46.(SHIZhong-sheng,CHEN Kai-yuan,SHI Jun,et al.Sulfur isotopiccomposition and its geological significance of the paleogene sulfaterock deposited in Dongpu Depression[J].Petroleum Explorationand Development,2004,31(6):44-46.)
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