Soft-sediment deformation structures in deepwater fine-grained sedimentary rocks of the Member 2 of Eocene Kongdian Formation,Cangdong sag
Yan Jihua1, 2, Jiao Yuxi1, Chen Shiyue1, 2, Deng Yuan1, Pu Xiugang3
1 School of Geosciences,China University of Petroleum(East China),Qingdao 266580,Shandong; 2 Evaluation and Detection Technology Laboratory of Marine Mineral Resources,Qingdao National Laboratory;for Marine Science and Technology,Qingdao 266071,Shandong; 3 Research Institute of Exploration and Development,Dagang Oilfield Company,PetroChina,Tianjin 300280;
Abstract：The soft-sediment deformation structures in fine-grained sedimentary rocks of deepwater lacustrine are mainly developed in strata of mudstone and micritic carbonate rocks. Most of the soft-sediment deformation structures are prone to be ignored in the core observation because of the small size(microscopic scale). The authors take Well G108-8 in the Member 2 of Eocene Kongdian Formation in Cangdong sag as research object to identify the synsedimentary micro fracture,liquefied vein,micro fold deformation,micro weight deformation,random deformation and other types of soft-sediment deformation structures through the intensive microscopic observation and elaborate core description. The soft-sediment deformation structures formed in deepwater fine-grained sedimentary rocks in the study area overall have characteristics like small scale,no association of obvious gravity flow sand body in vertical,in situ origin,sedimentary laminae developed and so on. The formation mechanism of soft-sediment deformation structures can be divided into the overlying stress unloading,lateral extrusion stress and internal stress release from the view point of the styles of stress adjustment,and the different formation mechanisms response to multiple changes of sedimentary environments. The research of soft-sediment deformation structures formed in deepwater fine-grained sediments of lacustrine can reconstruct the changes of ancient sedimentary environments and predict the gravity flow direction. It also has a great guiding significance to oil and gas exploration in the deepwater fine-grained sedimentary rocks.
Yan Jihua,Jiao Yuxi,Chen Shiyue et al. Soft-sediment deformation structures in deepwater fine-grained sedimentary rocks of the Member 2 of Eocene Kongdian Formation,Cangdong sag[J]. JOPC, 2017, 19(1): 89-98.
1 杜芳鹏,刘池洋,王建强,熊林芳,李健. 2014. 鄂尔多斯盆地南部上三叠统延长组软沉积变形特征及构造意义. 现代地质,28(2): 314-320. [Du F P,Liu C Y,Wang J Q,Xiong L F,Li J. 2014. Characteristics and tectonic sense of soft sedimentary structures in Yanchang Formation,South Ordos Basin. Geoscience,28(2): 314-320] 2 巨银娟,张小莉. 2016. 鄂尔多斯盆地白豹地区三叠系延长组长6段滑塌变形特征研究. 西北大学学报(自然科学版),46(1): 87-93. [Ju Y J,Zhang X L. 2016. Slump sedimentary characteristics of the Triassic Chang 6 reservoir from the Baibao Area,Ordos Basin. Journal of Northwest University(Natural Science Edition),46(1): 87-93] 3 李勇,钟建华,邵珠福,毛毳. 2012. 软沉积变形构造的分类和形成机制研究. 地质论评,58(5): 829-838 . [Li Y,Zhong J H,Shao Z F,Mao C. 2012. An overview on the classification and genesis of soft-sediment deformation structure. Geological Review,58(5): 829-838] 4 李元昊,刘池洋,王秀娟. 2008. 鄂尔多斯盆地三叠系延长组震积岩特征研究. 沉积学报,26(5): 772-779. [Li Y H,Liu C Y,Wang X J. 2008. Discovery and significance of seismites in Late Tertiary Yanchang Formation of Ordos Basin. Acta Sedimentologica Sinca,26(5): 772-779] 5 刘金华,吴立峰,乔力,孙秀会,孙晓庆. 2014. 苏北盆地高邮凹陷深凹带古近系戴南组软沉积物变形构造及沉积模式研究. 地质论评,60(5): 1019-1025. [Liu J H,Wu L F,Qiao L,Sun X H,Sun X Q. 2014. Depositional model and characteristic of soft-sediment deformation structures of the Paleogene Dainan Formation in Gaoyou Sag,North Jiangsu Basin. Geological Review,60(5): 1019-1025] 6 乔秀夫,郭宪璞,李海兵,苟宗海,苏德辰,唐哲民,张伟,杨光. 2012. 龙门山晚三叠世软沉积物变形与印支期构造运动. 地质学报,86(1): 132-156. [Qiao X F,Guo X P,Li H B,Gou Z H,Su D C,Tang Z M,Zhang W,Yang G. 2012. Soft-sediment deformation in the Late Triassic and the Indosinian tectonic movement in Longmenshan. Acta Geologica Sinica,86(1): 132-156] 7 乔秀夫,郭宪璞. 2011. 新疆西南天山下侏罗统软沉积物变形研究. 地质论评,57(6): 761-769. [Qiao X F,Guo X P. 2011. On the lower jurassic soft-sediment deformation of Southwestern Tianshan Mountains,Xinjiang,China. Geological Review,57(6): 761-769] 8 石亚军,陈武杰,曹正林,李红哲,王斌婷,黄思静. 2009. 柴达木盆地西南区震积岩的发现及其引发的勘探启迪. 地质学报,83(8): 1178-1187. [Shi Y J,Chen W J,Cao Z L,Li H Z,Wang B T,Huang S J. 2009. Discovery of seismites in the southwestern Qaidam Basin and its significance for exploration. Acta Geologica Sinica,83(8): 1178-1187] 9 田媛,钟建华,王书宝,陶红胜,刘韶光,李勇,孙宁亮,邵珠福,倪良田,毛毳,葛玉柱,陈彬,曲俊利,王桂林. 2015. 鄂尔多斯盆地富县探区三叠系延长组震积岩及其地质意义. 古地理学报,17(4): 541-552. [Tian Y,Zhong J H,Wang S B,Tao H S,Liu S G,Li Y,Sun N L,Shao Z F,Ni L T,Mao C,Ge Y Z,Chen B,Qu J L,Wang G L. 2015. Seismites and their geological significances of the Triassic Yanchang Formation in Fuxian exploration area,Ordos Basin. Journal of Palaeogeography(Chinese Edition),17(4): 541-552] 10 王化爱,刘广春,杨玉平,孟玮. 2010. 蒙古国南贝尔凹陷泥质软沉积变形构造特征及沉积序列. 油气地质与采收率,17(6): 43-46,113-114. [Wang H A,Liu G C,Yang Y P,Meng W. 2010. Mud soft sedimentary deformation created by Cretaceous in South Bell sag,Mongolia. Petroleum Geology and Recovery Efficiency,17(6): 43-46,113-114] 11 王化爱,钟建华,隆锋. 2008. 蒙古南贝尔凹陷白垩纪地震作用的证据. 沉积学报,26(6): 975-981. [Wang H A,Zhong J H,Long F. 2008. The evidence for seismism in Cretaceous of South Beir sag,Mongolia. Acta Sedimentologica Sinca,26(6): 975-981] 12 武振杰. 2006. 滇中中元古代软沉积物变形构造及其地质意义. 中国地质大学(北京)博士论文, [Wu Z J. 2006. Mesoproterozoic soft-sediment deformational structures in central Yunnan,China and their geological implications. Doctoral Dissertation of China University of Geosciences(Beijing)] 13 鄢继华,崔永北,陈世悦. 2009. 几种常见震积岩相标志在模拟实验中的识别. 沉积学报,27(6): 1131-1137. [Yan J H,Cui Y B,Chen S Y. 2009. Identification of common facies indicattors of seismites in simulated experiments. Acta Sedimentologica Sinica,27(6): 1131-1137] 14 杨剑萍,聂玲玲,杨君. 2008. 柴达木盆地西南缘新近系与地震沉积有关的软沉积物变形构造及其地质意义. 沉积学报,26(6): 967-974. [Yang J P,Nie L L,Yang J. 2008. Soft-sediment deformation structures of Neogene related to earthquake and its geological significance in the southwestern margin of Qaidam Basin. Acta Sedimentologica Sinca,26(6): 967-974] 15 袁静,陈鑫,张善文. 2008. 济阳坳陷古近系软沉积变形层中的砂岩脉特征. 石油学报,29(3): 336-340,344. [Yuan J,Chen X,Zhang S W. 2008. Characteristics of sand dikes in the Paleogene soft-sediments of Jiyang Depression. Acta Petrolei Sinica,29(3): 336-340,344] 16 岳信东,林春明,李艳丽,徐深谋,张志萍,漆滨汶,王秀林,张放东. 2009. 二连盆地白音查干凹陷下白垩统震积岩的发现及其地质意义. 高校地质学报,15(1): 57-62. [Yue X D,Lin C M,Li Y L,Xu S M,Zhang Z P,Qi B W,Wang X L,Zhang F D. 2009. The discovery of seismites in the lower cretaceous of Baiyinchagan Depression,Erlian Basin and its geological implications. Geological Journal of China Universities,15(1): 57-62] 17 曾敏. 2010. 美国肯塔基州东部Slade组下部碳酸盐岩沉积学特征及St.Louis段软沉积物变形. 中国地质大学(北京)博士论文,[Zeng M. 2010. Carbonate Stratigraphy of Lower Part of Slade Formation(Mississippian)and the Soft-Sediment Deformation in the St. Louis Member,Kentucky,USA. Doctoral Dissertation of China University of Geosciences(Beijing)] 18 赵澂林,刘孟慧. 1988. 湖相沉积岩中的同生变形构造及其地质意义. 岩石学报,4: 14-21,89-91. [Zhao C L,Liu M H. 1988. Contemporaneous deformed structures in lacustrine sedimentary rock and their geological significance. Acta Petrologica Sinica,4: 14-21,89-91] 19 钟建华,王德金,李佳,陈熙. 2011. 塔拉哈—齐家地区下白垩统震积岩特征及其油气储集问题. 地质找矿论丛,26(3): 304-310. [Zhong J H,Wang D J,Li J,Chen X. 2011. Characteristics of Cretaceous seismite in the Talaha-Qijia area and its significance. Contributions to Geology and Mineral Resources Research,26(3): 304-310] 20 Davies R J. 2003. Kilometer-scale fluidization structures formed during early burial of a deepwater slope channel on the Niger Delta. Geology,31: 949-952. 21 Duranti D,Hurst A. 2004. Fluidization and injection in the deep-water sandstones of the Eocene Alb Formation(UK North Sea). Sedimentology,51: 503-529. 22 Kale M G,Pundalik A S, Duraiswami R A, Karmalkar N R. 2016. Soft Sediment Deformation Structures from Khari River Section of Rudramata Member,Jhuran Formation,Kutch: A Testimony of Jurassic Seismites. Journal Geological Society of India,87: 194-204. 23 Kundu A,Matin A,Mukul M,Eriksson P G. 2011. Sedimentary facies and soft-sediment deformation structures in the late Miocene-Pliocene Middle Siwalik Subgroup,Eastern Himalaya,Darjiling District,India. Acta Sedimentologica Sinca,78: 321-336. 24 Lowe D R. 1975. Water escape structures in coarse-grained sediments. Sedimentology,22: 157-204.
