Sedimentary characteristics and evolution of thin interbeds of the Member 2 of Paleogene Liushagang Formation in eastern Wushi sag,Beibu Wan Basin
Sun Le1, 2, Yu Xinghe1, 2, Li Shengli1, 2, Zhang Hui3, He Yulin4, Yang Kaile3, Qiao Yarong1, 2, Zhang Wenmiao1, 2, Wu Zijin1, 2, Gao Mingxuan1, 2
1 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083; 2 Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism,Ministry of Education,Beijing 100083; 3 Zhanjiang Branch,CNOOC Ltd.,Zhanjiang 524057,Guangdong; 4 Guangzhou Marine Geological Survey,Ministry of Land & Resources,Guangzhou 510760,Guangdong
Abstract：The structure and sedimentary characteristics of the Member 2 of Liushagang Formation in the eastern Wushi sag,Beibu Wan Basin are very complex. The sedimentation is of great variation with sharp lateral changes. The understanding of sediment provenance and sedimentary facies is controversial. Using core,logging,seismic,and laboratory data,the present study attempts to: (1)investigate sediment provenance,sedimentary facies and evolution of the Member 2 of the Liushagang Formation in the study area;(2)determine the distribution and evolution of sedimentary facies in the study area;(3)predict favorable reservoir distribution characteristics;and(4)to better serve the oil and gas exploration and development. Results from this study suggest that the northern high-lying area represents the sediment provenance of the Member 2 of the Liushagang Formation,which is characterized by the delta front-deep lake sedimentary sequence. The normal deltaic sediments were well developed,and the thickness of individual sand bodies is small,which manifests as multilayer interactive distribution. The Member 2 of the Liushagang Formation is divided into four 4th￣order sequences from bottom to top. MSC2 and MSC3 sequences formed during the short-term rapid water regression were involved into the process of longer-term water transgression. The sediment supply was sufficient,sand bodies were,thus,well developed. Observations from this work suggest that the buried depth and sedimentary facies play a pivotal role in the modulation of the reservoir properties of the Member 2 of the Liushagang Formation. Reservoir properties of B oil field are better than those of A oil filed. The subaqueous distributary channel and estuary dam developed near the source of the delta front are favorable reservoir distribution areas.
Sun Le,Yu Xinghe,Li Shengli et al. Sedimentary characteristics and evolution of thin interbeds of the Member 2 of Paleogene Liushagang Formation in eastern Wushi sag,Beibu Wan Basin[J]. JOPC, 2017, 19(6): 1023-1036.
[1] 陈全红,李文厚,刘昊伟,李克永,庞军刚,郭艳琴,袁珍. 2009. 鄂尔多斯盆地上石炭统—中二叠统砂岩物源分析. 古地理学报,11(6): 629-640. [Chen Q H,Li W H,Liu H W,Li K Y,Pang J G,Guo Y Q,Yuan Z. 2009. Provenance analysis of sandstone of the Upper Carboniferous to Middle Permian in Ordos Basin. Journal of Palaeogeography(Chinese Edition),11(6): 629-640] [2] 崔周旗,李文厚,李莉,万珊,侯凤梅. 2005. 冀中饶阳凹陷蠡县斜坡古近系沙河街组沙二段及沙一段下亚段沉积相与隐蔽油藏. 古地理学报,7(3): 373-381. [Cui Z Q,Li W H,Li L,Wan S,Hou F M. 2005. Sedimentary facies and subtle petroleum reservoir of the Mem-ber 2 and lower submember of Member 1 of Shahejie Formation of Paleogene on Lixian Slope of Raoyang Sag,Central Hebei Province. Journal of Palaeogeography(Chinese Edition),7(3): 373-381] [3] 韩帅. 2014. 乌石凹陷构造特征及成因机制. 中国石油大学(华东)硕士学位论文. [Han S. 2014. The Tectonic Characteristics and ForMing mechanism of Wushi Sag. Master's Dissertation of China University of Petroleum(East China)] [4] 贺婷婷,李胜利,高兴军,宋岑,周新茂,贺东旭. 2014. 浅水湖泊三角洲平原分流河道类型与叠置模式. 古地理学报,16(5): 597-604. [He T T,Li S L,Gao X J. 2014. Types and superposed patterns of distributary channels in a shallow lacustrine delta plain. Journal of Palaeogeography(Chinese Edition),16(5): 597-604] [5] 胡德胜,邓勇,张建新,左倩媚,何卫军. 2016. 乌石凹陷东区古近系断裂系统与油气成藏. 西南石油大学学报(自然科学版),38(4): 27-36. [Hu D S,Deng Y,Zhang J X,Zuo Q M,He W J. 2016. Palaeogene fault system and hydrocarbon accumulation in East Wushi Sag. Journal of Southwest Petroleum University(Science & Technology Edition),38(4): 27-36] [6] 胡林,杨希冰,徐雪丰,付大巍,张帅. 2016. 南海北部湾盆地乌石凹陷成藏主控因素与成藏模式. 海洋地质与第四纪地质,36(2): 121-127. [Hu L,Yang X B,Xu X F,Fu D W,Zhang S. 2016. Main controlling factors and accumulation models of hydrocarbon in Wushi Sag,Beibu Gulf Basin,South China Sea. Marine Geology & Quaternary Geology,36(2): 121-127] [7] 李茂,李胜利,姜平,于兴河,曾小明,戴明建. 2013. 北部湾盆地涠西南凹陷涠11区流一段扇三角洲沉积特征及控制因素. 现代地质,27(4): 915-924. [Li M,Li S L,Jiang P,Yu X H,Zeng X M,Dai M J. 2013. Sedimentary characteristics of fan deltas and the dominated factors in W11 Area of 1st Member of Liushagang Formation in Weixinan Depression,Beibuwan Basin. Geoscience,27(4): 915-924] [8] 李胜利,于兴河,张志杰,朱庆荣. 2004. 珠江口盆地西江30-2油田新近系中新统沉积微相及层序地层分析. 古地理学报,6(1): 30-40. [Li S L,Yu X H,Zhang Z J,Zhu Q R. 2004. Sedimentary microfacies and sequence stratigraphy of the Miocene of Neogene in Xijiang 30-2 Oil Field,Pearl River Mouth basin. Journal of Palaeogeography(Chinese Edition),6(1): 30-40] [9] 李绪深,甘军,张迎朝,张建新,杨希冰,邓勇,徐新德,吴杨瑜. 2015. 南海西部海域断陷湖盆油气聚集规律及勘探前景. 中国海上油气,27(4): 22-29. [Li X S,Gan J,Zhang Y C,Zhang J X,Yang X B,Deng Y,Xu X D,Wu Y Y. 2015. Hydrocarbon regularity and exploration prospects of fault lacustrine basins in western South China Sea. China Offshore Oil and Gas,27(4): 22-29] [10] 林畅松,刘景彦,张英志,胡博. 2005. 构造活动盆地的层序地层与构造地层分析:以中国中、新生代构造活动湖盆分析为例. 地学前缘,12(4): 365-374. [Lin C S,Liu J Y,Zhang Y Z,Hu B. 2005. Sequence stratigraphy and tectono-stratigraphic analysis of tectonically active basins: A case study on the Cenozoic-Mesozoic lacustrine basins in China. Earth Science Frontiers,12(4): 365-374] [11] 刘金龙,李胜利,梁星如,黄杰,梁官忠,于仁江,曹斌,吕俊平. 2016. 冀中坳陷蠡县斜坡古近系沙一下亚段沉积物源分析. 古地理学报,18(5): 809-817. [Liu J L,Li S L,Liang X R,Huang J,Liang G Z,Yu R J,Cao B,Lü J P. 2016. Provenance analysis of the lower part of Member 1 of Paleogene Shahejie Formation in Lixian Slope,Central Hebei Depression. Journal of Palaeogeography(Chinese Edition),18(5): 809-817] [12] 卢林,汪企浩,黄建军. 2007. 北部湾盆地涠西南和海中凹陷新生代局部构造演化史. 海洋石油,27(1): 25-29. [Lu L,Wang Q H,Huang J J. 2007. Structural evolvement history of Weixinan and Haizhong depression in Beibuwan basin during Cenozoic Era. Offshore Oil,27(1): 25-29] [13] 马朋善. 2005. 砂泥岩薄互层的高分辨率地震储层反演预测. 中国地质大学(北京)博士学位论文. [Ma P S. 2005. The Seismic Inversion and Prospect of High Resolution Seismic Reservoir with the Thin Interbeds of Sandstone and Mudstone. Doctoral Dissertation of China University of Geosciences(Beijing)] [14] 屈红军,马强,高胜利,梅志超,苗建宇. 2011. 物源与沉积相对鄂尔多斯盆地东南部上古生界砂体展布的控制. 沉积学报,29(5): 825-834. [Qu H J,Ma Q,Gao S L,Mei Z C,Miao J Y. 2011. Controls of provenance and depositional facies on sandbody distributions of the Upper Paleozoic in Southeast Ordos Basin. Acta Sedimentologica Sinica,29(5): 825-834] [15] 宋璠,邱隆伟,苏妮娜,徐宁宁,周鹏. 2016. 渤海湾盆地渤南洼陷古近系沙河街组二段沉积相特征及演化. 石油与天然气地质,37(4): 499-508. [Song F,Qiu L W,Su N N,Xu N N,Zhou P. 2016. Feature and evolution of sedimentary facies in the second member of Paleogene Shahejie Formation in Bonan Subsag,Bohai Bay Basin. Oil & Gas Geology,37(4): 499-508] [16] 孙伟,樊太亮,赵志刚,王宏语,高志前. 2008. 乌石凹陷古近系层序地层及沉积体系. 天然气工业,28(4): 26-28. [Sun W,Fan T L,Zhao Z G,Wang H Y,Gao Z Q. 2008. Paleogene sequence stratigraphy and sedimentary system in Wushi Sag. Natural Gas Industry,28(4): 26-28] [17] 王建刚,胡修棉,黄志诚. 2008. 藏南桑单林地区晚白垩世—始新世砂岩物源区分析. 地质学报,82(1): 92-103. [Wang J G,Hu X M,Huang Z C. 2008. Provenance analysis of Late Cretaceous-Early Eocene sandstones in the Sangdanlin area,southern Tibet. Acta Geologica Sinica,82(1): 92-103] [18] 王松,李双应,杨栋栋,何刚,赵大千. 2012. 天山南缘石炭系—三叠系碎屑岩成分及其对物源区大地构造属性的指. 岩石学报,28(8): 2453-2465. [Wang S,Li S Y,Yang D D,He G,Zhao D Q. 2012. Compositions of Carboniferous-Triassic clastic rocks in the southern margin of the Tianshan,Northwest China: Implications for the evolution of the provenance tectonic attributes. Acta Petrologica Sinica,28(8): 2453-2465] [19] 肖建新,孙粉锦,何乃祥,刘锐娥,李靖,肖红平,张春林. 2008. 鄂尔多斯盆地二叠系山西组及下石盒子组盒 8段南北物源沉积汇水区与古地理. 古地理学报,10(4): 341-354. [Xiao J X,Sun F J,He N X,Liu R E,Li J,Xiao H P,Zhang C L. 2008. Permian Shanxi Formation and Member 8 of Xiashihezi Formation in Ordos Basin: Palaeogeography and catchment area for sediments derived from north and south provenances. Journal of Palaeogeography(Chinese Edition),10(4): 341-354] [20] 杨海长,梁建设,胡望水. 2011. 乌石凹陷构造特征及其对油气成藏的影响. 西南石油大学学报(自然科学版),33(3): 41-46. [Yang H C,Liang J S,Hu W S. 2011. Structural features and impacts on hydrocarbon accumulation in Wushi Sag. Journal of Southwest Petroleum University(Science & Technology Edition),33(3): 41-46] [21] 印森林,陈恭洋,张玲,罗迎春,汪超平,刘甜甜. 2016. 岩相构型对致密砂岩优质储层的控制作用:以川西坳陷须二段为例. 天然气地球科学,27(7): 1179-1189. [Yin S L,Chen G Y,Zhang L,Luo Y C,Wang C P,Liu T T. 2016. The controlling effect of lithofacies architecture on high quality tight sandstone reservoirs: A case study of second member of the Upper Triassic of Xujiahe Formation,western Sichuan Depression,China. Natural Gas Geoscience,27(7): 1179-1189] [22] 于兴河,李胜利. 2009. 碎屑岩系油气储层沉积学的发展历程与热点问题思考. 沉积学报,27(5): 880-895. [Yu X H,Li S L. 2009. The development and hotspot problems of clastic petroleum reservoir sedimentology. Acta Sedimentologica Sinica,27(5): 880-895] [23] 于兴河,李胜利,李顺利. 2013. 三角洲沉积的结构—成因分类与编图方法. 沉积学报,31(5): 782-797. [Yu X H,Li S L,Li S L. 2013. Texture-genetic classifications and mapping methods for deltaic deposits. Acta Sedimentologica Sinica,31(5): 782-797] [24] 曾小明,张辉,彭松,周展,王磊,谢晶. 2015. 涠洲12-A油田流二段Ⅱ油组沉积特征及演化. 沉积学报,33(1): 153-159. [Zeng X M,Zhang H,Peng S,Zhou Z,Wang L,Xie J. 2015. Sedimentary characteristics and evolution of the 2nd Oil Series in the 2nd Member of Liushagang Formation in Weizhou12-A Oilfield. Acta Sedimentologica Sinica,33(1): 153-159] [25] 赵军,洪庆玉,董伟良. 2001. 北部湾涠西南凹陷物源方向及古地理景观分析. 石油勘探与开发,28(5): 25-28. [Zhao J,Hong Q Y,Dong W L. 2001. Analysis on material sources and palaeogeographic landscapes of Weixinan sag. Petroleum Exploration and Development,28(5): 25-28] [26] 钟玮,蒲秀刚,何幼斌,陈长伟,林常梅,韩文中,张伟,吴超. 2012. 渤海湾盆地黄骅坳陷孔南地区古近系孔店组二段物源分析. 古地理学报,14(6): 707-718. [Zhong W,Pu X G,He Y B,Chen C W,Lin C M,Han W Z,Zhang W,Wu C. 2012. Provenance of the Member 2 of Paleogene Kongdian Formation in Kongnan area,Huanghua Depression Bohai Bay Basin. Journal of Palaeogeography(Chinese Edition),14(6): 707-718] [27] Lemons D R, Chan M A. 1999. Facies architecture and sequence stratigraphy of fine-grained lacustrine deltas along the eastern margin of late Pleistocene lake Bonneville,northern Utah and southern Idaho.AAPG Bulletin,83(4): 635-665.
