Abstract In order to clarify the sedimentary-palaeogeography characteristics and sequence framework of the Triassic in Awati sag,Tarim Basin,based on the research ideas of terrigenous sequence stratigraphy and lake-basin sedimentology,and using basic data consisting of drilling core and seismic data,this paper puts forward new understanding on sequence division,sediment provenance,and sedimentary-palaeogeography distribution and evolution. In this study,the Ohobluk Formation and Karamay Formation of the Triassic in Awati sag are divided into seven third-order sequences,among which the Lower Triassic Ohobluk Formation is divided into five(SQ1-SQ5)and the Middle Triassic Karamay Formation is divided into two sequences(SQ6-SQ7). Each sequence is composed of the lowstand system tract(LST),transgressive system tract(TST),and highstand system tract(HST). It is suggested that the Triassic in Awati sag is characterized by fan deltas,braided river deltas,and shore-shallow lacustrine facies controlled by multiple sources. There are four major sources around the sag and the sediment supply is mainly from the southwestern Bachu Uplift and the western Keping Fault Uplift,then from the northern Tabei Uplift and the southeastern Tazhong Uplift. The braided river delta plain subfacies are mainly distributed at the southern and southwestern edge of the sag,mainly composed of coarse grained sandstone and sandy gravel sandbodies of braided distributary channel microfacies. The center of the lake basin is located in the eastern part of the sag. Within the sag,there are braided delta front subfacies and lacustrine facies,mainly composed of underwater braided distributary channels and beach bar sandbodies. During the Triassic,the lake basin experienced stages of early initiation,intermediate growth and peak,and finally filling and extinction. The early stage of the Lower Triassic(SQ1-SQ2 period),corresponding to the development of the lower part of the Ohobluk Formation,is the initiation stage of the Awati lake basin in the Triassic. Sediments mainly came from the Bachu Uplift in the south and the Keping Fault Uplift in the west. The sedimentary facies were distributed in an asymmetric belt from south to north,with the development of braided delta plain and front subfacies and shore-shallow lacustrine subfacies. Moreover,during that stages,the lake basin is shallow in the south and deep in the north,shallow in the west and deep in the east. The middle to late stage of the Lower Triassic(SQ3-SQ5 period),corresponding to the development of the upper member of the Ohobluk Formation,is the growth and peak period of lake basin. With the continuous progradation of sources from the southwest and west towards the basin,fan delta facies were formed. At the same time,the lake basin expanded to the north and northeast,forming a braided delta plain and front subfacies that continuously migrated from south to north,while the northeast is a shore-shallow to semi-deep lacustrine subfacies. The early-middle period of the Middle Triassic(SQ6-SQ7 period),corresponding to the development of the Karamay Formation,is the filling and extinction period of the lake basin. The migration of the subsidence center to the northeast region resulted in the continuous progradation of the sources,causing the lake basin to rapidly shrink and eventually died out.
Fund:National Science and Technology Major Project of China(No.2016ZX05046-001)
About author: JIA Jinhua,born in 1965,Ph.D.,is a professor of engineering. He is mainly engaged in sedimentology,reservoir geology and petroleum geology. E-mail: jjh@petrochina.com.cn.
Cite this article:
JIA Jinhua. Sequence characteristics and sedimentary palaeogeography evolution of the Triassic in Awati sag,Tarim Basin[J]. JOPC, 2024, 26(4): 763-778.
JIA Jinhua. Sequence characteristics and sedimentary palaeogeography evolution of the Triassic in Awati sag,Tarim Basin[J]. JOPC, 2024, 26(4): 763-778.
[1] 陈景山,唐青松,代宗仰,谭秀成,刘景环. 2007. 特征不同的两种扇三角洲识别与对比. 西南石油大学学报, 29(4): 1-6. [Chen J S,Tang Q S,Dai Z Y,Tan X C,Liu J H.2007. Recognition and correlation of two distinct types of fan delta facies. Journal of Southwest Petroleum University, 29(4): 1-6] [2] 党青宁,赵宽志,孙雄伟,朱长见,刘永福,向东,崔永福,赵崴. 2009. 阿瓦提凹陷三叠系地震相特征及有利探区预测. 新疆石油地质, 30(2): 208-210. [Dang Q N,Zhao K Z,Sun X W,Zhu C J,Liu Y F,Xiang D,Cui Y F,Zhao W.2009. Prediction of seismic facies and favorable prospecting areas of Triassic in Awati Sag,Tarim Basin. Xinjiang Petroleum Geology, 30(2): 208-210] [3] 顾家裕. 1996. 塔里木盆地沉积层序特征及其演化. 北京: 石油工业出版社,1-361. [Gu J Y.1996. Sedimentary Character and Evolution in Tarim Basin. Beijing: Petroleum Industry Press, 1-361] [4] 顾家裕,朱筱敏,贾进华. 2003. 塔里木盆地沉积与储层. 北京: 石油工业出版社,1-400. [Gu J Y,Zhu X M,Jia J H.2003. Sedimentary Reservoir in Tarim Basin. Beijing: Petroleum Industry Press, 1-400] [5] 顾忆,赵永强,贾存善,何光玉,罗宇,王斌,路清华. 2012. 塔里木盆地阿瓦提坳陷油气资源潜力分析. 石油实验地质, 34(3): 257-266. [Gu Y,Zhao Y Q,Jia C S,He G Y,Luo Y,Wang B,Lu Q H.2012. Analysis of hydrocarbon resource potential in Awati Depression of Tarim Basin. Petroleum Geology & Experiment, 34(3): 257-266] [6] 何文渊,李江海,钱祥麟,张臣. 2000. 塔里木盆地巴楚断隆中新生代的构造演化. 北京大学学报(自然科学版),36(4)539-546. [He W Y,Li J H,Qian X L,Zhang C.2000. The Meso-Cenozoic evolution of Bachu Fault-Uplift in Tarim Basin. Acta Scientiarum Naturalium Universitatis Pekinensis, 36(4): 539-546] [7] 贾承造. 1997. 中国塔里木盆地构造特征与油气. 北京: 石油工业出版社,1-438. [Jia C Z.1997. Tectonics Characteristics and Petroleum Tarim Basin China. Beijing: Petroleum Industry Press, 1-438] [8] 贾进华,周东延,张立平,刘泽斌,周兴熙. 2004. 塔里木盆地乌什凹陷石油地质特征. 石油学报, 25(6): 13-18. [Jia J H,Zhou D Y,Zhang L P,Liu Z B,Zhou X X.2004. Petroleum geologic characteristics of Wushi Sag in Tarim Basin. Acta Petrolei Sinaca, 25(6): 13-18] [9] 李曰俊,孙龙德,杨海军,张光亚,齐英敏,桑洪,王月然,刘亚雷,张强,文磊. 2013. 塔里木盆地阿瓦提凹陷周缘的晚新生代张扭性断层带. 地质科学, 48(1): 109-123. [Li Y J,Sun L D,Yang H J,Zhang G Y,Qi Y M,Sang H,Wang Y R,Liu Y L,Zhang Q,Wen L.2013. The late Cenozoic tensor-shear fault zones around Awati Sag,NW Tarim Basin. Chinese Journal of Geology, 48(1): 109-123] [10] 刘亚雷,齐英敏,刘云翔,王月然,赵岩,张强,文磊,胡秀芳,李曰俊. 2013. 塔里木盆地阿恰构造带断裂构造分析. 现代地质, 27(1): 158-164. [Liu Y L,Qi Y M,Liu Y X,Wang Y R,Zhao Y,Zhang Q,Wen L,Hu X F,Li Y J.2013. Tectonic analysis on Aqia fault belt in the Western Tarim Basin. Geoscience, 27(1): 158-164] [11] 刘亚雷,高永进,张君峰,白忠凯,程明华,张远银,杨有星. 2022. 塔里木盆地温宿凸起构造特征新认识. 岩石学报, 38(9): 2665-2680. [Liu Y L,Gao Y J,Zhang J F,Bai Z K,Cheng M H,Zhang Y Y,Yang Y X.2022. New understanding of tectonic characteristic of the Wensu salient in Tarim Basin. Acta Petrologica Sinica, 38(9): 2665-2680] [12] 刘志宏,王孔伟,迟元林,王文革,林东成,张立国,葛百成. 2004. 塔里木盆地阿瓦提—巴楚地区褶皱构造特征. 地质科学, 39(2): 251-259. [Liu Z H,Wang K W,Chi Y L,Wang W G,Lin D C,Zhang L G,Ge B C.2004. Folding charicteristics of Awati—Bachu area in the Tarim Basin. Chinese Journal of Geology, 39(2): 251-259] [13] 卢玉红,钱玲,张海组,黄龙藏,吴建国,何芬贤. 2008. 塔里木阿瓦提凹陷乌鲁桥油苗地化特征及来源. 海相油气地质, 13(2): 45-51. [Lu Y H,Qian L,Zhang H Z,Huang L C,Wu J G,He F X.2008. Origin and geochemical characteristics of Wuluqiao oil seepage in Awati sag,Tarim Basin. Marine Origin Petroleum Geology, 13(2): 45-51] [14] 吕修祥,李建交,赵风云,肖中尧,陈新卫. 2007. 塔里木盆地西部环阿瓦提凹陷区油气勘探前景再认识. 海相油气地质, 12(3): 10-14. [Lü X X,Li J J,Zhao F Y,Xiao Z Y,Chen X W.2007. Recognition on petroleum exploration prospect of marine carbonates in western Tarim Basin. Marine Origin Petroleum Geology, 12(3): 10-14] [15] 吕雪雁,朱筱敏,申银民,高雷. 2002. 塔里木盆地台盆区三叠系层序地层研究和有利勘探区预测. 石油勘探与开发, 29(1): 32-35. [Lü X Y,Zhu X M,Shen Y M,Gao L.2002. The Triassic sequence stratigraphy and the prediction of the favourable exploration targets in Tarim Basin. Petroleum Exploration and Development, 29(1): 32-35] [16] 唐开疆. 1993. 塔里木盆地三叠系沉积特征及生烃潜力. 石油实验地质, 15(2): 128-137. [Tang K J.1993. Sedimentary features and hydrocarbon potential in the Trissic system of the Tarim Basin. Experimental Petroleum Geology, 15(2): 128-137] [17] 田军. 2019. 塔里木盆地油气勘探成果与勘探方向. 新疆石油地质, 40(1): 1-11. [Tian J.2019. Petroleum exploration achievements and future targets of Tarim Basin. Xinjiang Petroleum Geology, 40(1): 1-11] [18] 田军,王清华,杨海军,李勇. 2021. 塔里木盆地油气勘探历程与启示. 新疆石油地质, 42(3): 272-282. [Tian J,Wang Q H,Yang H J,Li Y.2021. Petroleum exploration history and enlightenment in Tarim Basin. Xinjiang Petroleum Geology, 42(3): 272-282] [19] 田作基,罗志立,罗蛰潭,彭大钧,于汇津,宋建国. 1996. 新疆阿瓦提陆内前陆盆地. 石油与天然气地质, 17(4): 282-286. [Tian Z J,Luo Z L,Luo Z T,Peng D J,Yu H J,Song J G.1996. Awati introcontinental forland basin in Xinjiang. Oil & Gas Geology, 17(4): 282-286] [20] 王超,黄智斌,谭泽金. 2008. 塔里木盆地北部坳陷阿瓦提凹陷三叠系划分对比. 新疆地质, 26(2): 133-136. [Wang C,Huang Z B,Tan Z J.2008. The classification and correlation of Trissic in Awati Depression,north depression,Tarim Basin. Xinjiang Geology, 26(2): 133-136] [21] 王龙樟. 2000. 塔里木盆地阿瓦提—满加尔坳陷三叠—侏罗纪沉积物源变迁. 地球科学: 中国地质大学学报, 25(1): 39-43. [Wang L Z.2000. Provenance evolution and migration of Triassic and Jurassic Awati-Manjiaer Depression,Tarim Basin. Earth Science: Journal of China University of Geosciences, 25(1): 39-43] [22] 王文革,刘俊峰,张全文. 2001. 塔里木盆地阿瓦提凹陷石油勘探前景预测. 大庆石油地质与开发, 20(3): 18-20. [Wang W G,Liu J F,Zhang Q W.Prediction of the petroleum exploration prospect of Awati Depression in Tarim Basin. Petroleum Geology & Oilfield Development in Daqing, 20(3): 18-20] [23] 吴崇筠,薛叔浩. 1993. 中国含油气盆地沉积学. 北京: 石油工业出版社,1-484. [Wu C Y,Xue S H.1993. Sedimentology of Petroliferous Basins of China. Beijing: Petroleum Industry Press,1-484] [24] 吴嘉鹏,陆金波,王英民,万丽芬,周兴海,夏广胜. 2014. 塔里木盆地北部三叠系“二元”层序结构特征及演化模式. 沉积学报, 32(2): 325-333. [Wu J P,Lu J B,Wang Y M,Wan L F,Zhou X H,Xia G S.2014. Dual feature of sequence architecture and sequence evolution model of Triassic Northern Tarim Basin. Acta Sedimentologica Sinica, 32(2): 325-333] [25] 席勤,余和中,顾乔元,钱玲,李新生,李毓丰. 2016. 塔里木盆地阿瓦提凹陷主力烃源岩探讨及油源对比. 大庆石油地质与开发, 35(1): 12-18. [Xi Q,Yu H Z,Gu Q Y,Qian L,Li X S,Li Y F.2016. Main hydrocarbon source rocks and contrasts for Awati sag in Tarim basin. Petroleum Geology and Oilfield Development in Daqing, 35(1): 12-18] [26] 萧德铭,冯子辉. 1999. 塔里木盆地大庆区块烃源岩演化史与油气成藏期研究. 石油实验地质, 21(1): 28-33. [Xiao D M,Feng Z H.1999. Study on the evolutionary history of source rock and the pool-forming periods of hydrocabon in the Daqing Block of the Tarim Basin. Experimental Petroleum Geology, 21(1): 28-33] [27] 谢晓安,胡素云,卢华复. 1998. 探讨塔里木盆地巴楚断隆的正反转构造. 地质论评, 44(1): 1-6. [Xie X A,Hu S Y,Lu H F.Positive inversion structure in the Bachu fault-uplift in the Tarim Basin. Geological Review, 44(1): 1-6] [28] 姚尧,何治亮,李慧莉,张瑜,高晓鹏,王康宁,焦存礼. 2020. 塔里木盆地阿瓦提断陷中—上奥陶统萨尔干组沉积地质模型与烃源岩分布预测. 石油与天然气地质, 41(4): 763-775. [Yao Y,He Z L,Li H L,Zhang Y,Gao X P,Wang K N,Jiao C L.2020. Sedimentary geological model and distribution prediction of source rocks in the Saergan Formation(Middle-Upper Ordovician)in Awati fault depression,Tarim Basin. Oil & Gas Geology, 41(4): 763-775] [29] 张君峰,高永进,杨有星,周新桂,张金虎,张远银. 2019. 塔里木盆地温宿凸起油气勘探突破及启示. 石油勘探与开发, 46(1): 14-24. [Zhang J F,Gao Y J,Yang Y X,Zhou X G,Zhang J H,Zhang Y Y.2019. Oil exploration breakthrough in the Wensu salient,northwest Tarim Basin and its implications. Petroleum Exploration and Development, 46(1): 14-24] [30] 张君峰,张远银,高永进. 2022. 塔里木盆地沙井子构造带志留系油气勘探突破及启示. 石油勘探与开发, 49(1): 203-214. [Zhang J F,Zhang Y Y,Gao Y J.2022. Silurian hydrocarbon exploration breakthrough and its implications in the Shajingzi structural belt of Tarim Basin,NW China. Petroleum Exploration and Development, 49(1): 203-214] [31] 张希明,刘青芳,王贵全. 1995. 塔里木盆地北部三叠—侏罗系砂岩碎屑组分与板块构造位置关系的研究. 新疆地质, 13(3): 251-255. [Zhang X M,Liu Q F,Wang G Q.1995. Triassic-Jurassic sandstone fragment components related with plate tectonic position in the Northern Tarim basin. Xinjiang Geology,13(3): 251-255] [32] 赵靖舟,贾承造. 2002. 塔里木盆地阿瓦提—满加尔低梁构造特征和形成演化. 地质论评, 48(1): 68-73. [Zhao J Z,Jia C Z.2002. Structural characteristics and tectonic evolution of the Awati-Manjia'er ridge,the Tarim Basin. Geological Review, 48(1): 68-73] [33] 周慧,陈永权,李洪辉,李保华,黄理力,刘亚雷,龚洪林,文磊. 2021. 塔里木盆地巴楚隆起北缘的吐木休克断裂与巴东断裂. 地质科学, 56(1): 1-18. [Zhou H,Chen Y Q,Li H H,Li B H,Huang L L,Liu Y L,Gong H L,Wen L.2021. The Tumuxiuke and Badong faults on the northern boundary of the Bachu Rise,Tarim Basin. Chinese Journal of Geology, 56(1): 1-18] [34] 周园园,吕修祥,齐英敏,白忠凯,朱海燕,李毓丰. 2011. 阿瓦提凹陷沙井子断裂带特征及控油气作用. 新疆石油地质, 32(6): 605-608. [Zhou Y Y,Lü X X,Qi Y M,Bai Z K,Zhu H Y,Li Y F.2011. Shajingzi fault belt and its controlling effect on hydrocarbons in Awati sag in Tarim Basin. Xinjiang Petroleum Geology, 32(6): 605-608] [35] 朱德丰,刘和甫,吴根耀. 2008. 塔里木盆地西部吐木休克断裂带的主要特征和构造演化. 地质科学, 43(2): 209-227. [Zhu D F,Liu H F,Wu G Y.2008. Main characteristics and structural evolution of the Tumxuk fault zone in the western Tarim Basin. Chinese Journal of Geology, 43(2): 209-227] [36] Bhatia M R.1983. Plate tectonics and geochemical composition of sandstone. The Journal of Geology, 91(6): 611-627. [37] Vail P R,Mitchum R M,Thompson S.1977. Seismic stratigraphy and global changes of sea level. In: Payton C E(ed). Seismic Stratigraphy: applications to Hydrocarbon Exploration. Tulsa: AAPG Memoir, 26: 83-97.
