Petroleum Reservoir Evaluation and Development >
2025 , Vol. 15 >Issue 5: 750 - 759
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2025.05.005
Discussion and significance of evidence for Paleocene strata by drilling in Yingcuixuan area of Xihu Sag
Received date: 2024-11-13
Online published: 2025-09-19
The Xihu Sag of the East China Sea Shelf Basin is characterized by thick Cenozoic sediments. Extensive research has been conducted on the geological conditions and hydrocarbon accumulation of the Eocene, Oligocene, and Miocene strata, with limited studies on the Paleocene strata. Recent studies indicate that the Paleocene strata in the Xihu Sag have significant hydrocarbon generation potential and constitute an important source rock system, which plays a key role in oil and gas generation and accumulation in the Xihu Sag. To clarify the development characteristics of the Paleocene strata and their implications for oil and gas accumulation, this study analyzed data from well J-1 in the Yingcuixuan area, located in the northern slope segment of the Xihu Sag. Four lines of evidence supported that well J-1 has penetrated the Paleocene strata: ⑴ regional seismic correlation suggested that the deep layers of well J-1 exhibited medium-to-high frequency, medium-to-weak amplitude, and medium-to-low continuity reflections, with distinct stratigraphic folding. The strata below the T40 seismic reflection interface showed truncation features, which are typical seismic facies characteristics of the top of the Paleocene strata. ⑵ Lithological assemblage comparison revealed that the lower section of well J-1 contained marker layers of reddish-brown mudstone, indicating a Paleocene lake-delta depositional environment. ⑶ Palynological comparison showed that the Paleocene sporopollen characteristics in the study area were similar to those in the Changjiang Sag, both lacking marine foraminifera. ⑷ During the Paleocene, a large fault-depression structure formed, controlled by basement faults. The downthrow side of a fault provided favorable geological conditions for the formation of thick Paleocene strata. By analyzing the geochemical characteristics of the Paleocene source rocks in well J-1 and comparing them with geochemical indicators from other sags in the East China Sea Shelf Basin, it was concluded that the Paleocene strata in the Xihu Sag host medium-to-good source rocks with significant hydrocarbon generation potential. This study provides valuable guidance for oil and gas exploration deployment in the Xihu Sag. The findings suggest that the area near the depression in the Yingcuixuan area is favorable for large-scale oil and gas exploration due to the development of thick Paleocene source rocks (dark mudstone).
JIANG Donghui , ZHUANG Jianjian , XING Lyuya , ZHANG Chuanyun , YUAN Zhongpeng , YANG Chao . Discussion and significance of evidence for Paleocene strata by drilling in Yingcuixuan area of Xihu Sag[J]. Petroleum Reservoir Evaluation and Development, 2025 , 15(5) : 750 -759 . DOI: 10.13809/j.cnki.cn32-1825/te.2025.05.005
| [1] | 朱立新, 宋在超. 东海西湖凹陷原型盆地构造格架与演化分析[J]. 海洋石油, 2016, 36(1): 1-6. |
| ZHU Lixin, SONG Zaichao. Analysis of tectonic framework and evolution of prototype basin in Xihu Sag of the East China Sea[J]. Offshore Oil, 2016, 36(1): 1-6. | |
| [2] | 陈琳琳, 高月华, 李昆, 等. 西湖凹陷迎翠轩地区古新统沉积相及成藏条件探讨[J]. 海洋石油, 2016, 36(3): 13-19. |
| CHEN Linlin, GAO Yuehua, LI Kun, et al. Discussion on sedimentary facies and hydrocarbon accumulation conditions of Paleocene in Yingcuixuan area, Xihu Sag[J]. Offshore Oil, 2016, 36(3): 13-19. | |
| [3] | 许怀智, 张迎朝, 蒋一鸣, 等. 东海盆地长江凹陷美人峰组的时代归属及其地质意义[J]. 地质学报, 2022, 96(6): 1972-1984. |
| XU Huaizhi, ZHANG Yingzhao, JIANG Yiming, et al. Age assignment and geological significance of Meirenfeng Formation in the Yangtze River sag, East China Sea basin[J]. Acta Geologica Sinica, 2022, 96(6): 1972-1984. | |
| [4] | 钟锴, 朱伟林, 高顺莉, 等. 东海陆架盆地形成演化及油气成藏关键地质问题[J]. 地球科学, 2018, 43(10): 3485-3497. |
| ZHONG Kai, ZHU Weilin, GAO Shunli, et al. Key geological questions of the formation and evolution and hydrocarbon accumulation of the East China Sea shelf basin[J]. Earth Science, 2018, 43(10): 3485-3497. | |
| [5] | ZHU W L, ZHONG K, FU X W, et al. The formation and evolution of the East China Sea shelf basin: A new view[J]. Earth-Science Reviews, 2019, 190: 89-111. |
| [6] | 周平. 东海西湖凹陷始新统沉积环境及含油气性[J]. 上海地质, 1994, 15(2): 19-25. |
| ZHOU Ping. Eocene sedimentary environment and oil and gas bearing features of Xihu sag in the shelf basin of the East China Sea[J]. Shanghai Geology, 1994, 15(2): 19-25. | |
| [7] | 陈琳琳, 王丽顺. 西湖凹陷平湖组(E2 2-3)半咸水有孔虫群特征分析及指相意义[J]. 上海地质, 1995, 16(1): 32-37. |
| CHEN Linlin, WANG Lishun. Plaeoecologic analysis of brackish water foraminifers in Pinghu formation(E2 2-3) of Xihu Sag[J]. Shanghai Geology, 1995, 16(1): 32-37. | |
| [8] | 彭治超, 李亚男, 张孙玄琦, 等. 主微量元素地球化学特征在沉积环境中的应用[J]. 西安文理学院学报(自然科学版), 2018, 21(3): 108-111. |
| PENG Zhichao, LI Yanan, ZHANG Sunxuanqi, et al. Application of the geochemical characteristics of the major and trace elements in the sedimentary environment[J]. Journal of Xi’an University(Natural Science Edition), 2018, 21(3): 108-111. | |
| [9] | 温孝胜, 赵焕庭, 王丽荣. 南沙群岛南永3井岩心常量和微量元素特征及其古环境意义[J]. 海洋通报, 2001, 20(4): 32-38. |
| WEN Xiaosheng, ZHAO Huanting, WANG Lirong. Characteristics of the constant and trace elements and their paleo-environmental significance in the core of Nanyong-3 Well, Nansha Islands[J]. Marine Science Bulletin, 2001, 20(4): 32-38. | |
| [10] | 李浩, 徐怀民, 王千军, 等. 准东地区平地泉组微量元素地球化学特征及油气地质意义[J]. 断块油气田, 2023, 30(2): 277-285. |
| LI Hao, XU Huaimin, WANG Qianjun, et al. Geochemical characteristics and petroleum geological significance of trace elements of Pingdiquan Formation in eastern Junggar Basin[J]. Fault-Block Oil & Gas Field, 2023, 30(2): 277-285. | |
| [11] | 高秦, 厉子龙, 陈燕婷, 等. 晚更新世以来杭州湾沉积地球化学特征对源-汇过程的启示[J]. 地球化学, 2024, 53(3): 454-478. |
| GAO Qin, LI Zilong, CHEN Yanting, et al. Implications of sedimentary geochemical characteristics for source-sink processes in Hangzhou Bay since the Late Pleistocene[J]. Geochimica, 2024, 53(3): 454-478. | |
| [12] | 陶国保, 梁连喜, 朱平. 浙闽近海瓯江凹陷新生代地质构造发展特征[J]. 地质科学, 1992, 27(1): 1-9. |
| TAO Guobao, LIANG Lianxi, ZHU Ping. Characteristics of Cenozoic geologic and tectonic development of the Oujiang depression in Zhejiang-Fujian offshore sea[J]. Chinese Journal of Geology(Scientia Geologica Sinica), 1992, 27(1): 1-9. | |
| [13] | 吕成福, 陈国俊, 梁建设, 等. 东海陆架盆地瓯江凹陷古近系沉积演化[J]. 海洋地质前沿, 2011, 27(8): 1-7. |
| Chengfu LYU, CHEN Guojun, LIANG Jianshe, et al. Evolutionary history of the Paleogene deposits in Oujiang sag, East China Sea basin[J]. Marine Geology Frontiers, 2011, 27(8): 1-7. | |
| [14] | 陈国俊, 李超, 梁建设, 等. 东海陆架盆地瓯江凹陷明月峰组沉积相及沉积特征分析[J]. 天然气地球科学, 2011, 22(5): 760-769. |
| CHEN Guojun, LI Chao, LIANG Jianshe, et al. Sedimentary facies of Mingyuefeng formation in Oujiang Sag, East China Sea basin[J]. Natural Gas Geoscience, 2011, 22(5): 760-769. | |
| [15] | 王志峰, 包建平. 柴北缘冷湖构造带与马北油田原油地球化学特征对比[J]. 地球科学与环境学报, 2017, 39(5): 683-694. |
| WANG Zhifeng, BAO Jianping. Comparisons of geochemical characteristics of crude oils from Lenghu structure zone and Mabei oilfield in the northern Qaidam basin[J]. Journal of Earth Sciences and Environment, 2017, 39(5): 683-694. | |
| [16] | 杨传胜, 杨长清, 杨艳秋, 等. 东海洋陆过渡带中—新生代构造变形及动力学机制[J]. 海洋地质与第四纪地质, 2020, 40(1): 71-84. |
| YANG Chuansheng, YANG Changqing, YANG Yanqiu, et al. Meso-Cenozoic deformation and dynamic mechanism of the ocean-continent transitional zone in the East China Sea[J]. Marine Geology & Quaternary Geology, 2020, 40(1): 71-84. | |
| [17] | 郝乐伟, 王琪, 梁建设, 等. 东海陆架盆地瓯江凹陷油气成藏机制探讨[J]. 天然气地球科学, 2014, 25(6): 848-859. |
| HAO Lewei, WANG Qi, LIANG Jianshe, et al. Mechanism of hydrocarbon accumulation in Oujiang Sag, the East China Sea shelf basin[J]. Natural Gas Geoscience, 2014, 25(6): 848-859. | |
| [18] | 赵艳秋. 东海陆架盆地长江凹陷生油岩研究[J]. 海洋石油, 2003, 23(增刊1): 40-44. |
| ZHAO Yanqiu. The study on source rock of Changjiang sag of the East China Sea shelf basin[J]. Offshore Oil, 2003, 23(Suppl. 1): 40-44. | |
| [19] | 梅博文, 刘希江. 我国原油中异戊间二烯烷烃的分布及其与地质环境的关系[J]. 石油与天然气地质, 1980, 1(2): 99-115. |
| MEI Bowen, LIU Xijiang. The distribution of isoprenoid alkanes in China’s crude oil and its relation with the geologic environment[J]. Oil & Gas Geology, 1980, 1(2): 99-115. | |
| [20] | 陈建平, 赵长毅, 何忠华. 煤系有机质生烃潜力评价标准探讨[J]. 石油勘探与开发, 1997, 24(1): 1-5. |
| CHEN Jianping, ZHAO Changyi, HE Zhonghua. Criteria for evaluating the hydrocarbon generating potential of organic matter in coal measures[J]. Petroleum Exploration and Development, 1997, 24(1): 1-5. | |
| [21] | LEI C, YIN S Y, YE J R, et al. Geochemical characteristics and hydrocarbon generation modeling of the Paleocene source rocks in the Jiaojiang Sag, East China Sea basin[J]. Journal of Earth Science, 2024, 35(2): 642-654. |
| [22] | 袁灵聪, 朱晓军, 蔡进功, 等. 东海盆地长江坳陷美人峰组烃源岩沉积环境与生烃潜力评价[J]. 沉积学报, 2021, 39(2): 506-514. |
| YUAN Lingcong, ZHU Xiaojun, CAI Jingong, et al. Sedimentary environment and hydrocarbon generation potential of source rocks from the Meirenfeng formation in the Changjiang depression, East China Sea basin[J]. Acta Sedimentologica Sinica, 2021, 39(2): 506-514. | |
| [23] | 孙玉梅, 席小应. 东海盆地丽水凹陷油气源对比与成藏史[J]. 石油勘探与开发, 2003, 30(6): 24-28. |
| SUN Yumei, XI Xiaoying. Petroleum reservoir filling history and oil-source correlation in the Lishui Sag, East China Sea Basin[J]. Petroleum Exploration and Development, 2003, 30(6): 24-28. | |
| [24] | 李智, 李双建, 王濡岳, 等. 川西地区雷口坡组气藏气源分析与成藏模式[J]. 断块油气田, 2024, 31(2): 299-307. |
| LI Zhi, LI Shuangjian, WANG Ruyue, et al. Gas source analysis and accumulation model of Leikoupo Formation gas reservoir in western Sichuan Basin[J]. Fault-Block Oil & Gas Field, 2024, 31(2): 299-307. | |
| [25] | 郭刚, 廖计华, 徐建永, 等. 椒江凹陷下古新统月桂峰组半深湖—深湖相烃源岩综合识别与分布预测[J]. 海洋地质与第四纪地质, 2024, 44(2): 199-209. |
| GUO Gang, LIAO Jihua, XU Jianyong, et al. Comprehensive recognition and distribution prediction of semi-deep and deep lacustrine source rock of the Lower Paleocene Yueguifeng Formation in Jiaojiang Sag[J]. Marine Geology & Quaternary Geology, 2024, 44(2): 199-209. |
/
| 〈 |
|
〉 |