西湖凹陷平湖组物源分析

doi:10.3969/j.issn.1672-7703.2017.02.006

摘要/Abstract

摘要： 西湖凹陷平湖组是否存在东侧物源存在争议，东侧物源的确定对油气勘探意义重大。综合利用钻井、地震、分析化验等资料，分析西湖凹陷平湖组沉积物的重矿物ZTR指数、砂岩类型、岩屑组分、砂岩百分含量以及地震相、同沉积构造特征等，发现平湖组沉积物的陆源重矿物ZTR指数及砂岩成分成熟度呈“凹陷两侧低、中间高”的特征，自生重矿物菱铁矿及砂岩百分含量则呈“凹陷两侧高、中间低”分布；由地震反射特征可知，平湖组存在明显的盆地边缘杂乱反射及指示东侧物源存在的前积反射构型；而且平湖组中晚期生长背斜的存在，从构造应力方面进一步印证了平湖组沉积时期东部隆褶带的存在。综合以上研究，认为东部隆褶带在平湖组沉积期就已经隆起并作为西湖凹陷的东侧物源，西湖凹陷中东部深层平湖组具有良好的油气勘探前景。

关键词: 平湖组, 物源分析, ZTR指数, 地震相, 西湖凹陷

Abstract: It is disputable about whether the eastern provenance exists for the Pinghu Formation in the Xihu sag. Its clear answer will be signifcant for hydrocarbon exploration. Based on drilling, seismic, and test data, the Pinghu Formation sediments were analyzed in respect of ZTR index of heavy minerals, sandstone types, debris composition, sandstone content, seismic facies and syndepositional structural features. It is found that the ZTR index of terrigenous heavy minerals and the maturity of sandstone components in the Pinghu Formation are "low at both sides of the sag and high in the middle", while the contents (or percentages) of siderite (an authigenic heavy mineral) and sandstone are "high at both sides of the sag and low in the middle". According to seismic reflection features, the Pinghu Formation has apparent chaotic reflections at basin margin and prograding reflection confguration that indicates the existence of the eastern provenance. Moreover, the existence of growth anticlines during middle-late stage of the Pinghu Formation further proves, from the prospective of tectonic stress, that there was an eastern folded and uplifted belt during the sedimentation of the Pinghu Formation. It is concluded that the eastern folded and uplifted belt had already uplifted and become the eastern provenance during the sedimentation of the Pinghu Formation. The deep Pinghu Formation in central and eastern parts of the Xihu sag has good hydrocarbon exploration prospect.

Key words: ZTR index, seismic facies, Xihu sag, Pinghu Formation, provenance analysis

中图分类号:

TE112

吴嘉鹏, 张兰, 万丽芬, 赵千慧, 杨彩虹, 王英民. 西湖凹陷平湖组物源分析[J]. 中国石油勘探, 2017, 22(2): 50-57.

Wu Jiapeng, Zhang Lan, Wan Lifen, Zhao Qianhui, Yang Caihong, Wang Yingmin. Provenance analysis of Pinghu Formation in Xihu sag[J]. China Petroleum Exploration, 2017, 22(2): 50-57.

参考文献

[1] 刘成鑫.东海平湖油气田平湖组沉积相研究[J].海洋石油，2010,30(2):9-13. Liu Chengxin. Study on sedimentary facies for Pinghu Formation in Pinghu oil and gas field in East China Sea Basin [J]. Offshore Oil, 2010,30(2):9-13.
[2] 武法东，苏新，周平，刘金水，李培廉.东海陆架盆地下第三系高频层序分析[J].地质论评，2001,47(1):47-52. Wu Fadong, Su Xin, Zhou Ping, Liu Jinshui, Li Peilian. Analysis of Paleogene high-frequency sequences in the East China Sea shelf basin [J]. Geological Review, 2001,47(1):47-52.
[3] 王果寿，周卓明，肖朝辉，李美洲，周维奎，王琳.西湖凹陷春晓区带下第三系平湖组、花港组沉积特征[J].石油与天然气地质，2002,23(3):257-261. Wang Guoshou, Zhou Zhuoming, Xiao Chaohui, Li Meizhou, Zhou Weikui, Wang Lin. Sedimentary characteristics of Eogene Pinghu Formation and Huagang Formation in Chunxiao zone of Xihu lake depression [J]. Oil & Gas Geology, 2002,23(3): 257-261.
[4] 姜雨，陈华，姚刚，李艳青.针对海上开发区的多船宽方位地震采集观测系统优化设计——以东海西湖凹陷为例[J].中国石油勘探, 2016,21(4):114-120. Jiang Yu,Chen Hua,Yao Gang, Li Yanqing. Optimization of multi-vessel wide-azimuth observation system for seismic observation in offshore production zones: a case study on Xihu sag, East China Sea [J]. China Petroleum Exploration, 2016, 21(4):114-120.
[5] 翟玉兰.东海陆架盆地西湖凹陷古近系层序地层与沉积体系研究[D].青岛：中国海洋大学，2009. Zhai Yulan. The study on the sequence stratigraphy and sedimentary system in Paleogene of Xihu sag in the East China Sea shelf basin [D].Qingdao: Ocean University of China, 2009.
[6] 高雁飞，傅恒，葛海波，赵立欣，徐昉昊.东海西湖凹陷T-H地区平湖—花港组物源分析[J].科学技术与工程，2013,13(22):6549-6552. Gao Yanfei, Fu Heng, Ge Haibo, Zhao Lixin, Xu Fanghao. Provenance analysis of Pinghu-Huagang Formation in Xihu sag, East China Sea [J]. Science Technology and Engineering, 2013,13(22):6549-6552.
[7] 金翔龙，喻普之.冲绳海槽的构造特征与演化[J].中国科学，1987,2(6):196-203. Jin Xianglong, Yu Puzhi. Structural features and evolution of Okinawa trough [J]. China Science, 1987,2(6):196-203.
[8] 周祖翼，廖宗廷，金性春，贾健谊.冲绳海槽——弧后背景下大陆张裂的最高阶段[J].海洋地质与第四纪地质，2001,21(1):51-55. Zhou Zuyi, Liao Zongting, Jin Xingchun, Jia Jianyi. Okinawa trough: the highest stage of continental tension rifting in back-arc setting [J]. Marine Geology & Quaternary Geology, 2001, 21(1):51-55.
[9] 刘光鼎.东海的地质与油气勘探[J].地球物理学报，1988,31(2): 184-197. Liu Guangding. Geology and exploration of petroleum in the East Sea [J]. Acta Geophysica Sinica, 1988,31(2):184-197.
[10] 彭伟欣.东海油气勘探成果回顾及开发前景展望[J].海洋石油，2001,21(3):1-6. Peng Weixin. Prospects for developments and retrospects for oil/gas exploratory results in the East China Sea [J]. Offshore Oil, 2001,21(3):1-6.
[11] 张功成，张厚和，赵钊，唐晓音，王鹏，李飞跃.“源热共控”中国近海盆地石油富集规律[J].中国石油勘探，2016,21(4):38-53. Zhang Gongcheng, Zhang Houhe, Zhao Zhao, Tang Xiaoyin, Wang Peng, Li Feiyue.“Joint control of source rocks and geothermal heat”-oil enrichment pattern of China’s offshore basins [J]. China Petroleum Exploration, 2016,21(4):38-53.
[12] 赵红格,刘池洋.物源分析方法及研究进展[J].沉积学报，2003,21(3):409-415. Zhao Hongge, Liu Chiyang. Approaches and prospects of provenance analysis [J]. Acta Sedimentologica Sinica, 2003, 21(3):409-415.
[13] 徐亚军，杜远生，杨江海.沉积物物源分析研究进展[J].地质科技情报，2007,26(3):26-32. Xu Yajun, Du Yuansheng, Yang Jianghai. Prospects of sediment provenance analysis [J]. Geological Science and Technology Information, 2007,26(3):26-32.
[14] 陈志明，于洁，侯奎.冀西北宣龙地区菱铁矿的成因[J].地质科学，1982,(4):395-402. Chen Zhiming, Yu Jie, Hou Kui. The genesis of siderite in the Xuanlong area of northwest Hebei [J]. Scientia Geologica Sinica, 1982,(4):395-402.
[15] 洪辉亮.重矿物[J].台湾海峡,1988,7(1):56-61. Hong Huiliang. Heavy mineral [J]. Journal of Oceanography in Taiwan Strait, 1988,7(1):56-61.
[16] 肖建新，孙粉锦，何乃祥，刘锐娥，李靖，肖红平，等.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[J].古地理学报，2008,10(4):341-354. Xiao Jianxin, Sun Fenjin, He Naixiang, Liu Ruie, Li Jing, Xiao Hongping, et al. Permian Shanxi Formation and Member 8 of Xiashihezi Formation in Ordos Basin：Palaeogeography and catchment area for sediments derived from north and south provenances [J]. Journal of Palaeography, 2008,10(4):341-354.
[17] 黄丽萍.论龙永煤田童子岩组菱铁矿及其岩相意义[J].中国煤田地质，2004,16(增刊1):41-43. Huang Liping. On siderite in Tongziyan formation, Longyong coalfield and its lithofacies meaning [J]. Coal Geology of China, 2004,16(Supp.1):41-43.
[18] 张道锋，杨文敬，漆亚玲，闫小雄.鄂尔多斯盆地神木地区上古生界山西组物源分析[J].天然气地球科学，2009,20(6):902-906. Zhang Daofeng, Yang Wenjing, Qi Yaling,Yan Xiaoxiong. Analysis of the material source of upper Paleozoic Shanxi Formation in Shenmu region of Ordos Basin [J]. Natural Gas Geoscience, 2009,20(6):902-906.
[19] 李明瑞，田景春，张清，窦伟坦，章辉若.鄂尔多斯盆地东部山西组山23亚段砂岩判别图版、砂岩分布规律及成因探讨[J].现代地质，2010,24(5):925-933. Li Mingrui, Tian Jingchun, Zhang Qing, Dou Weitan, Zhang Huiruo. The discriminant plate, distribution and genesis of sandstone of No.3 submember of the Shan 2 Member in the East Ordos Basin [J]. Geoscience, 2010,24(5):925-933.
[20] 杨明慧，刘池阳，孙冬胜. 冀中坳陷南区古近纪砂岩碎屑组分变化及其构造意义[J].矿物学报，2003,23(2):136-142. Yang Minghui, Liu Chiyang, Sun Dongsheng. Compositional variation of sandstone detritus and its tectonic significance in the lower Tertiary, southern Jizhong Basin, China [J]. Acta Mineralogica Sinica, 2003,23(2):136-142.
[21] 赵云翔，王建峰，丁熊，刘怡杉，姚泾利，李士祥.鄂尔多斯盆地上三叠统长9油层组物源分析[J].石油天然气学报，2012,34(4):7-13. Zhao Yunxiang, Wang Jianfeng, Ding Xiong, Liu Yishan, Yao Jingli, Li Shixiang. Provenance analysis of Chang 9 Member of Triassic Yanchang Formation in Ordos Basin [J]. Journal of Oil and Gas Technology, 2012,34(4):7-13.
[22] 杨锐，彭德堂，潘仁芳，石书缘，张莉.鄂尔多斯盆地西南部上古生界盒8段物源分析[J].石油地质与工程，2012,26(3):1-5. Yang Rui, Peng Detang, Pan Renfang, Shi Shuyuan, Zhang Li. Provenance analysis of Upper Paleozoic Member 8 of Xiashihezi Formation in southwestern Ordos Basin [J]. Petroleum Geology and Engineering, 2012,26(3):1-5.
[23] 王若谷，李文厚，廖友运，郭艳琴，刘昊伟.鄂尔多斯盆地三叠系延长组长7段物源区分析[J].地质通报，2013,32(4):671-684. Wang Ruogu, Li Wenhou, Liao Youyun, Guo Yanqin, Liu Haowei. Provenance analysis of Chang 7 Member of Triassic Yanchang Formation in Ordos Basin [J]. Geological Bulletin of China, 2013,32(4):671-684.
[24] 杨华，刘自亮，朱筱敏，邓秀芹，张忠义，齐亚林.鄂尔多斯盆地西南缘上三叠统延长组物源与沉积体系特征[J].地学前缘，2013,20(2):10-18. Yang Hua, Liu Ziliang, Zhu Xiaomin, Deng Xiuqin, Zhang Zhongyi, Qi Yalin. Provenance and depositional system of the Upper Triassic Yanchang Formation in the southwestern Ordos Basin, China [J]. Earth Science Frontiers, 2013,20(2):10-18.
[25] 李云，郑荣才，高博禹，胡晓庆，戴朝成.珠江口盆地白云凹陷渐新世/中新世地质事件的碎屑组分响应[J].现代地质，2011,25(3):476-481. Li Yun, Zheng Rongcai, Gao Boyu, Hu Xiaoqing, Dai Chaocheng. Characteristics of the detrital response to Oligocene/Miocene geological events in Baiyun sag, Pearl River Mouth Basin [J]. Geoscience, 2011,25(3):476-481.
[26] 张建培，徐发，钟韬，张田，余逸凡.东海陆架盆地西湖凹陷平湖组—花港组层序地层模式及沉积演化[J].海洋地质与第四纪地质，2012,32(1):35-41. Zhang Jianpei, Xu Fa, Zhong Tao, Zhang Tian, Yu Yifan. Sequence stratigraphic models and sedimentary evolution of Pinghu and Huagang Formations in Xihu Trough [J]. Marine Geology & Quaternary Geology, 2012,32(1):35-41.