东营凹陷永82井沙四段紫红色泥岩特征及其在层序划分中的应用
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摘要
在层序地层学研究中,层序界面的识别主要依据纵向分辨率较低的地震剖面、多解性较强的录井岩性组合和测井曲线等资料,而忽视了与不整合面有关的岩石古化学风化特征的分析,从而造成层序划分方案的多解性。通过对东营凹陷永82井沙四段紫红色泥岩的岩石学、地球化学以及古化学风化特征的分析,探讨了紫红色泥岩的纵向结构及其与层序界面的关系。永82井沙四段泥岩包括紫红色疏松状泥岩、紫红色致密块状泥岩、灰色层状泥岩以及灰色含膏泥岩和泥膏岩。沙四段紫红色疏松状泥岩具有强烈的擦痕面,其化学元素组成与古土壤相近,曾遭受程度较弱的古化学风化作用。结合紫红色泥岩的古化学风化特征认为,沙四段内部的层序界面与沙四段上、下亚段的边界不一致,紫红色疏松状泥岩段的顶界为沙四段内部的层序界面,而传统沙四段下亚段顶部的灰色砂岩夹紫色泥岩段属于上部层序的低水位体系域。
In the study of sequence stratigraphy underground, the sequence boundary's identification is mainly based on the seismic section with low vertical resolution, log data with high multiple solution and so on, but ignoring rocks' paleo-weathering characteristic which is relative to unconformable surface. Therefore, it leads to the ambiguity of stratigraphic sequence correlation. Based on the study of petrology, geochemistry and paleo-weathering characteristics about the red mudstone in Es4 Yong 82 well of Dongyingdepression, red mudstone's vertical structure and the relationship with sequence boundary are discussed herein. The mudstone in Es4 of Yong 82 well mainly includes 4 types: red loose mudstone, red compact massive mudstone, dark grey banding mudstone and grey or grayish purple gypsum mudstone. The red loose mudstone has strong striated rock surface, and its chemical element combinations are close to paleosol. The mudstone's chemical index of alteration analysis indicates that the red loose mudstone has suffered low chemical paleo-weathering, its CIA tends to be lower from top to bottom, indicating rocks' chemical paleo-weathering tends to be lower when the depth increases. The top of the red loose mudstone is relative to the sequence boundary in Es4. However, the grey sandstone with red mudstone in the top of early Es4 should be attributed to upper sequence's low stand system.
In the study of sequence stratigraphy underground, the sequence boundary's identification is mainly based on the seismic section with low vertical resolution, log data with high multiple solution and so on, but ignoring rocks' paleo-weathering characteristic which is relative to unconformable surface. Therefore, it leads to the ambiguity of stratigraphic sequence correlation. Based on the study of petrology, geochemistry and paleo-weathering characteristics about the red mudstone in Es4 Yong 82 well of Dongyingdepression, red mudstone's vertical structure and the relationship with sequence boundary are discussed herein. The mudstone in Es4 of Yong 82 well mainly includes 4 types: red loose mudstone, red compact massive mudstone, dark grey banding mudstone and grey or grayish purple gypsum mudstone. The red loose mudstone has strong striated rock surface, and its chemical element combinations are close to paleosol. The mudstone's chemical index of alteration analysis indicates that the red loose mudstone has suffered low chemical paleo-weathering, its CIA tends to be lower from top to bottom, indicating rocks' chemical paleo-weathering tends to be lower when the depth increases. The top of the red loose mudstone is relative to the sequence boundary in Es4. However, the grey sandstone with red mudstone in the top of early Es4 should be attributed to upper sequence's low stand system.
引文
[1]纪友亮,张世奇.陆相断陷湖盆层序地层学[M].北京:石油工业出版社,1996.
[2]武法东,陈建渝.东营凹陷第三纪层序地层格架及沉积体系类型[J].现代地质,1998,12(4):559-565.
[3]冯有良.东营凹陷下第三系层序地层格架及盆地充填模式[J].地球科学——中国地质大学学报,1999,24(6):635-642.
[4]隋风贵,赵乐强.济阳坳陷不整合结构类型及控藏作用[J].大地构造与成矿学,2006,30(2):161-167.
[5]李阳,蔡进功,刘建民.东营凹陷下第三系高分辨率层序地层研究[J].沉积学报,2002,20(2):210-216.
[6]宋国奇,纪友亮,赵俊青.不同级别层序界面及体系域的含油气性[J].石油勘探与开发,2003,30(3):32-35.
[7]宋国奇.济阳坳陷下第三系湖相沉积的层序地层学分析[J].现代地质,1993,7(1):7-13.
[8]陈涛,蒋有录,宋国奇,等.济阳坳陷不整合结构的发育过程及发育模式[J].油气地质与采收率,2009,16(5):33-36.
[9]高永进.砂砾岩体沉积旋回划分及对比方法——以济阳坳陷盐家地区沙四段上亚段为例[J].油气地质与采收率,2010,17(6):6-11.
[10]周自立,郝运轻,滕建彬,等.古土壤储层在胜利油区沙四段的发现[J].油气地质与采收率,2009,16(5):1-3.
[11]Yang Wan,Feng Qiao,Liu Yiqun,et al.Depositional environ ments and cyclo-and chronostratigraphy of uppermost Carbonifer ous-lower Triassic fluvial-lacustrine deposits,southern Bogeda mountains,NW China-a terrestrial paleoclimatic record of mid-latitude NE Pangea[J].Global and Planetary Change,2010,73(1/2):15-113.
[12]Taylor S R,Mclennan S M.The continental crust:its composition and evolution[M].Oxford:Blackwell Publishing,1985:1-312.
[13]Bestland E A.Alluvial terraces and paleosols as indicators of early Oligocene climate change(John Day Formation,Oregon)[J].Jour nal of Sedimentary Research,1997,67(5):840-855.
[14]陈旸,陈骏,刘连文.甘肃西峰晚第三纪红粘土的化学组成及化学风化特征[J].地质力学学报,2001,7(2):167-175.
[15]Nesbitt H W,Young G M.Early Proterozoic climates and plate mo tions inferred from major element chemistry of lutites[J].Nature,1982,299(21):715-717.
[16]Sheldon N D,Retallack G J,Tanaka S.Geochemical climofunctions from North America soils and application to paleosols across the Eo cene-Oligocene boundary in Oregon[J].Journal of Geology,2002,110(6):687-696.
[17]Girty G H,Ridge D L,Knaack C.Provenance and depositional set ting of Paleozoic chert and argillite,Sierra Nevada,California[J].Journal of Sedimentary Research,1996,66(1):107-118.
[18]张立强,罗晓容,何登发,等.准噶尔盆地南缘下白垩统层序界面的识别[J].沉积学报,2004,22(4):636-642.
[2]武法东,陈建渝.东营凹陷第三纪层序地层格架及沉积体系类型[J].现代地质,1998,12(4):559-565.
[3]冯有良.东营凹陷下第三系层序地层格架及盆地充填模式[J].地球科学——中国地质大学学报,1999,24(6):635-642.
[4]隋风贵,赵乐强.济阳坳陷不整合结构类型及控藏作用[J].大地构造与成矿学,2006,30(2):161-167.
[5]李阳,蔡进功,刘建民.东营凹陷下第三系高分辨率层序地层研究[J].沉积学报,2002,20(2):210-216.
[6]宋国奇,纪友亮,赵俊青.不同级别层序界面及体系域的含油气性[J].石油勘探与开发,2003,30(3):32-35.
[7]宋国奇.济阳坳陷下第三系湖相沉积的层序地层学分析[J].现代地质,1993,7(1):7-13.
[8]陈涛,蒋有录,宋国奇,等.济阳坳陷不整合结构的发育过程及发育模式[J].油气地质与采收率,2009,16(5):33-36.
[9]高永进.砂砾岩体沉积旋回划分及对比方法——以济阳坳陷盐家地区沙四段上亚段为例[J].油气地质与采收率,2010,17(6):6-11.
[10]周自立,郝运轻,滕建彬,等.古土壤储层在胜利油区沙四段的发现[J].油气地质与采收率,2009,16(5):1-3.
[11]Yang Wan,Feng Qiao,Liu Yiqun,et al.Depositional environ ments and cyclo-and chronostratigraphy of uppermost Carbonifer ous-lower Triassic fluvial-lacustrine deposits,southern Bogeda mountains,NW China-a terrestrial paleoclimatic record of mid-latitude NE Pangea[J].Global and Planetary Change,2010,73(1/2):15-113.
[12]Taylor S R,Mclennan S M.The continental crust:its composition and evolution[M].Oxford:Blackwell Publishing,1985:1-312.
[13]Bestland E A.Alluvial terraces and paleosols as indicators of early Oligocene climate change(John Day Formation,Oregon)[J].Jour nal of Sedimentary Research,1997,67(5):840-855.
[14]陈旸,陈骏,刘连文.甘肃西峰晚第三纪红粘土的化学组成及化学风化特征[J].地质力学学报,2001,7(2):167-175.
[15]Nesbitt H W,Young G M.Early Proterozoic climates and plate mo tions inferred from major element chemistry of lutites[J].Nature,1982,299(21):715-717.
[16]Sheldon N D,Retallack G J,Tanaka S.Geochemical climofunctions from North America soils and application to paleosols across the Eo cene-Oligocene boundary in Oregon[J].Journal of Geology,2002,110(6):687-696.
[17]Girty G H,Ridge D L,Knaack C.Provenance and depositional set ting of Paleozoic chert and argillite,Sierra Nevada,California[J].Journal of Sedimentary Research,1996,66(1):107-118.
[18]张立强,罗晓容,何登发,等.准噶尔盆地南缘下白垩统层序界面的识别[J].沉积学报,2004,22(4):636-642.
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