Important discoveries and understandings of oil and gas exploration in Yangjiang sag of the Pearl River Mouth Basin, northern South China Sea

doi:10.3969/j.issn.1672-7703.2019.03.001

Abstract

Abstract: The exploration based on foreign cooperation has been carried out many rounds in Yangjiang sag of the Pearl River Mouth Basin, but only a few oil and gas shows are discovered and no commercial oil and gas discovery is achieved. Recently, the petroleum geological conditions in Yangjiang East sag were analyzed systematically based on a great amount of new drilling, geochemical and seismic data. It is indicated that Yangjiang East sag can be divided into 4 subsags, including Yangjiang 24 subsag, Enping 19 subsag, Enping 20 subsag and Enping 21 subsag. There are 3 kinds of subsag structures, including composite half graben, double-fault graben and single half graben. In Paleogene Wenchang Formation, the intrabasinal middle-and small-sized provenances are dominant and the source rocks of semi-deep lake facies are widely developed. Among them, Enping 20 subsag has the earliest and longest subsag controlling faulting activity and generates Wenchang Formation which is complete and vertically superimposed stably. It is favorable for the formation of high-abundance source rocks of semi-deep lake facies to provide the rich hydrocarbon generation potential. By using the fluid detection technique, combined with the new understandings on source-fault controlled reservoir, Enping 20 structural belt of faulted anticline was selected to deploy Well Y10-1 preferentially. Owing to its deployment, a middle-sized oil field is discovered with daily industrial oil production over 1000 m³ during the testing, which means the important breakthrough of oil and gas exploration in Yangjiang sag and displays the promising exploration prospect in this area. In conclusion, the exploration discovery in Yangjiang sag opens up a new oil area in the Pearl River Mouth Basin, and the keys to the breakthrough of large- and middle-sized oil and gas fields in the new areas are focusing on the detailed information, enhancing the basic researches and standing on the value exploration.

Key words: Pearl River Mouth Basin, Yangjiang East sag, source rocks, source-fault controlled reservoir, fluid detection technique

CLC Number:

Peng Guangrong, Zhang Xiangtao, Xu Xinming, Bai Haijun, Cai Guofu, Zhao Chao, Zhang Zhiwei. Important discoveries and understandings of oil and gas exploration in Yangjiang sag of the Pearl River Mouth Basin, northern South China Sea[J]. China Petroleum Exploration, 2019, 24(3): 267-279.

References

[1] 朱伟林,张功成,钟锴.中国海洋石油总公司"十二五"油气勘探进展及"十三五"展望[J].中国石油勘探,2016,21(4):1-12. Zhu Weilin, Zhang Gongcheng, Zhong Kai. Oil and gas exploration progress of China National Offshore Oil Corporation during the 12^th Five-Year Plan and the prospect during the 13^th Five-Year Plan[J]. China Petroleum Exploration, 2016, 21(4):1-12.
[2] 夏庆龙.渤海油田近10年地质认识创新与油气勘探发现[J].中国海上油气,2016,28(3):1-9. Xia Qinglong. Innovation of geological theories and exploration discoveries in Bohai oilfields in the last decade[J]. China Offshore Oil and Gas, 2016,28(3):1-9.
[3] 米立军.认识创新推动南海东部海域油气勘探不断取得突破——南海东部海域近年主要勘探进展回顾[J].中国海上油气,2018,30(1):1-10. Mi Lijun. Continuous breakthroughs on petroleum exploration of the eastern South China Sea with innovative understanding:review of recent exploration progress[J]. China Offshore Oil and Gas, 2018,30(1):1-10.
[4] 何敏,雷永昌,于水明,陈雪芳,魏山力,刘培.南海北部浅水区低地温断陷成藏特征及勘探启示[J].中国石油勘探,2016,21(4):75-84. He Min, Lei Yongchang, Yu Shuiming, Chen Xuefang, Wei Shanli, Liu Pei. Hydrocarbon accumulation features and exploration inspiration of low geothermal rifted basins in shallow water area of northern South China Sea[J]. China Petroleum Exploration, 2016,21(4):75-84.
[5] 张强,吕福亮,贺晓苏,王彬,孙国忠.南海近5年油气勘探进展与启示[J].中国石油勘探,2018,23(1):54-61. Zhang Qiang, Lü Fuliang, He Xiaosu, Wang Bin, Sun Guozhong. Progress and enlightenment of oil and gas exploration in the South China Sea in recent five years[J]. China Petroleum Exploration, 2018,23(1):54-61.
[6] 米立军,张向涛,丁琳,杜家元,张韶琛.海上成熟探区中浅层岩性油气藏分布特点与勘探策略——以珠江口盆地惠州凹陷为例[J].中国石油勘探,2018,23(6):10-19. Mi Lijun, Zhang Xiangtao, Ding Lin, Du Jiayuan, Zhang Shaochen. Distribution characteristics and exploration strategy of middle-shallow lithologic reservoirs in offshore mature exploration areas:a case study on Huizhou sag in the Pearl River Mouth Basin[J]. China Petroleum Exploration, 2018, 23(6):10-19.
[7] 施和生,代一丁,刘丽华,姜航,李洪博,白静.珠江口盆地珠一坳陷油气藏地质特征与分布发育基本模式[J].石油学报,2015,36(增刊2):120-133. Shi Hesheng, Dai Yiding, Liu Lihua, Jiang Hang, Li Hongbo, Bai Jing. Geological characteristics and distribution model of oil and gas reservoirs in Zhu I depression, Pearl River Mouth Basin[J]. Acta Petrolei Sinica, 2015,36(S2):120-133.
[8] 雷宝华,郑求根,李俊良,李琦,刘豪,王海荣.珠三坳陷珠三南断裂形成演化及其对沉积中心迁移的控制[J].石油学报,2012,33(5):807-813. Lei Baohua, Zheng Qiugen, Li Junliang, Li Qi, Liu Hao, Wang Hairong. Formation and evolution of Zhu-3 south fault and its control on the depocenter shift in Zhu-3 depression, Pearl River Mouth Basin[J]. Acta Petrolei Sinica, 2012, 33(5):807-813.
[9] 钟志洪,施和生,朱明,庞雄,何敏,赵忠贤,等.珠江口盆地构造-成因机制探讨[J].中国海上油气,2014,26(5):20-29. Zhong Zhihong, Shi Hesheng, Zhu Ming, Pang Xiong, He Min, Zhao Zhongxian, et al. A discussion on the tectonic-stratigraphic framework and its origin mechanism in Pearl River Mouth Basin[J]. China Offshore Oil and Gas, 2014,26(5):20-29.
[10] 朱俊章,施和生,龙祖烈,杜家元,舒誉,施洋.珠一坳陷半地堑成藏系统成藏模式与油气分布格局[J].中国石油勘探,2015,20(1):24-37. Zhu Junzhang, Shi Hesheng, Long Zulie, Du Jiayuan, Shu Yu, Shi Yang. Accumulation pattern and Hydrocarbon distribution of half-graben accumulation system in Zhuyi depression[J]. China Petroleum Exploration, 2015,20(1):24-27.
[11] 施和生,何敏,张丽丽,余秋华,庞雄,钟志洪,等.珠江口盆地(东部)油气地质特征、成藏规律及下一步勘探策略[J].中国海上油气,2014,26(3):11-22. Shi Hesheng, He Min, Zhang Lili, Yu Qiuhua, Pang Xiong, Zhong Zhihong, et al. Hydrocarbon geology, accumulation pattern and the next exploration strategy in the Eastern Pearl River Mouth Basin[J]. China Offshore Oil and Gas, 2014,26(3):11-22.
[12] 张为彪,易浩,钟辉,牛胜利,徐徽,冯轩,等.珠江口盆地东部地区预探井失利原因分析及启示[J].中国石油勘探,2018,23(3):18-27. Zhang Weibiao, Yi Hao, Zhong Hui, Niu Shengli, Xu Hui, Feng Xuan, et al. Analysis on the causes of failed wildcat wells in the eastern Pearl River Mouth Basin and its enlightenment[J]. China Petroleum Exploration, 2018,23(3):18-27.
[13] 鲁宝亮,王璞珺,张功成,张斌,孙晓猛,李伍志,等.南海北部陆缘盆地基底结构及其油气勘探意义[J].石油学报,2011,32(4):580-587. Lu Baoliang, Wang Pujun, Zhang Gongcheng, Zhang Bin, Sun Xiaomeng, Li Wuzhi, et al. Basement structures of an epicontinental basin in the northern South China Sea and their significance in petroleum prospect[J]. Acta Petrolei Sinica, 2011,32(4):580-587.
[14] 孙晓猛,张旭庆,张功成,鲁宝亮,岳军培,张斌.南海北部新生代盆地基底结构及构造属性[J].中国科学:地球科学,2014,44(4):1312-1323. Sun Xiaomeng, Zhang Xuqing, Zhang Gongcheng, Lu Baoliang, Yue Junpei, Zhang Bin. Texture and tectonic attribute of Cenozoic basin basement in the northern South China Sea[J]. Science China:Earth Sciences, 2014,44(4):1312-1323.
[15] 刘志峰,吴克强,柯岭,王升兰,于开平,朱文奇.珠江口盆地珠一坳陷北部洼陷带油气成藏主控因素[J].石油与天然气地质,2017,38(3):561-569. Liu Zhifeng, Wu Keqiang, Ke Ling, Wang Shenglan, Yu Kaiping, Zhu Wenqi. Main factors controlling hydrocarbon accumulation in northern subsag belt of the Zhu-1 depression,Pearl River Mouth Basin[J]. Oil & Gas Geology, 2017,38(3):561-569.
[16] 杨海长,徐建永,武爱俊,印斌浩,李建红. 珠三坳陷阳江凹陷构造特征及其对油气成藏的影响[J].海洋石油,2011,31(2):20-24. Yang Haizhang, Xu Jianyong, Wu Aijun, Yin Binhao, Li Jianhong. Structural features and impact on hydrocarbon accumulation in Yangjiang sag of ZhuⅢ depression[J]. Offshore Oil, 2011,31(2):20-24.
[17] 刘再生,施和生,杨少坤,朱明,庞雄.南海东部海域自营勘探实践与成效[J].中国海上油气,2014,26(3):1-10. Liu Zaisheng, Shi Hesheng, Yang Shaokun, Zhu Ming, Pang Xiong. The practice of self-operated exploration and its achievements in the eastern South China Sea[J]. China Offshore Oil and Gas, 2014,26(3):1-10.
[18] Fazlikhani H, Fossen H, Gawthorpe R L. Basement structure and its influence on the structural configuration of the northern North Sea rift[J]. Tectonics, 2017,36(6):1151-1177.
[19] Hu Weijian, Hao Tianyao, Jiang Weiwei. An integrated geophysical study on the Mesozoic strata distribution and hydrocarbon potential in the South China Sea[J]. Journal of Asian Earth Sciences, 2015(111):31-43.
[20] Nanni U, Pubellier M, Chan L S. Rifting and reactivation of a cretaceous structural belt at the northern margin of the South China Sea[J]. Journal of Asian Earth Sciences, 2017(136):110-123.
[21] 张慧芳,吴欣松,王斌,段云江,屈洋,陈德飞.陆相湖盆沉积有机质富集机理研究进展[J].沉积学报,2016,6(34):463-477. Zhang Huifang, Wu Xinsong, Wang Bin, Duan Yunjiang, Qu Yang, Chen Defei. Research progress of the enrichment mechanism of sedimentary organics in lacustrine basin[J]. Acta Sedimentologica Sinica, 2016,6(34):463-477.
[22] 李绪宣,甘军,张迎朝,张建新,杨希冰,邓勇,等.南海西部海域断陷湖盆油气聚集规律及勘探前景[J].中国海上油气,2015,27(4):22-29. Li Xuxuan, Gan Jun, Zhang Yingzhao, Zhang Jianxin, Yang Xibing, Deng Yong, et al. Hydrocarbon accumulation regularity and exploration porspects of fault lacustrine basins in western South China Sea[J]. China Offshore Oil and Gas, 2015, 27(4):22-29.
[23] 代一丁,余秋华,李洪博,王卓超,白静,彭辉界.珠江口盆地珠一坳陷烃源灶控藏临界条件与控藏特征[J].石油学报,2015,36(增刊2):145-154. Dai Yiding, Yu Qiuhua, Li Hongbo, Wang Zhuochao, Bai Jing, Peng Huijie. Threshold conditions and reservoir-controlling characteristics of source kitchen in Zhu I depression, Pearl River Mouth Basin[J]. Acta Petrolei Sinica, 2015, 36(S2):145-154.
[24] 许新明,陈胜红,王福国,胡坤,于水明,王绪诚,等.珠江口盆地恩平凹陷断层特征及其对新近系油气成藏的影响[J].现代地质,2014,28(3):543-550. Xu Xinming, Chen Shenghong, Wang Fuguo, Hu Kun, Yu Shuiming, Wang Xucheng, et al. Structural features and its impacts on hydrocarbon accumulation of Neogene in Enping sag, Pearl River Mouth Basin[J]. Geoscience, 2014,28(3):543-550.
[25] 姜大朋,王文勇,高翔,张超,许新明.内部结构出发探讨断裂控藏机理及模式:以珠江口盆地珠一坳陷为例[J].地质科技情报,2016,35(4):91-97. Jiang Dapeng,Wang Wenyong,Gao Xiang, Zhang Chao, Xu Xinming. Mechanism and model of fault controlling reservoir in terms of the internal structure of fault zone:examples from ZhuⅠdepression, Pearl River Mouth Basin[J]. Geological Science and Technology Information, 2016,35(4):91-97.
[26] 许新明,姜建,陈胜红,刘丽华,刘贤来.珠江口盆地恩平凹陷断层封闭性评价[J].现代地质,2016,30(1):122-129. Xu Xinming, Jiang Jian, Chen ShengHong, Liu Lihua, Liu Xianlai. Evaluation method of fault sealing in Enping sag, Pearl River Mouth Basin[J]. Geoscience, 2016,30(1):122-129.
[27] 李玉彤.伊通盆地梁家浅层油气成藏机制及其油气分布规律[J].中国石油勘探,2012,17(2):12-16. Li Yutong. Hydrocarbon accumulation mechanism and distribution law of Liangjia shallow reservoirs, Yitong Basin[J]. China Petroleum Exploration, 2012,17(2):12-16.
[28] 李绪宣,朱振宇,张金淼.中国海油地震勘探技术进展与发展方向[J].中国海上油气,2016,28(1)1-12. Li Xuxuan, Zhu Zhenyu, Zhang Jinmiao. The progress and direction of seismic exploration technology in CNOOC[J]. China Offshore Oil and Gas, 2016,28(1):1-12.
[29] 印兴耀,曹丹平,王保丽,宗兆云. 基于叠前地震反演的流体识别方法研究进展[J].石油地球物理勘探,2014,49(1):22-35. Yin Xingyao, Cao Danping, Wang Baoli, Zong Zhaoyun. Research progress of fluid discrimination with pre-stack seismic inversion[J]. Oil Geophysical Prospecting,2014,49(1):22-35.
[30] Chen Shuangquan, Li Xiangyang, Wang Shangxu. The analysis of frequency-dependent characteristics for fluid detection:a physical model experiment[J]. Applied Geophysics, 2012,9(2):195-206.
[31] 李庆忠.含油气砂层的频率特征及振幅特征[J].石油地球物理勘探,1987,22(1):1-23. Li Qingzhong. The frequency and amplitude of seismic waves from hydrocarbon bearing sandstone[J]. Oil Geophysical Prospecting, 1987,22(1):1-23.
[32] Zhang Xianwen, Han Liguo, Wang Yu. Seismic spectral decomposition fast matching pursuit algorithm and its application[J]. Geophysical Prospecting for Petroleum (in Chinese), 2010,49(1):1-6.
[33] 施和生,王清斌,王军,刘晓健,冯冲,郝轶伟,等.渤中凹陷深层渤中19-6构造大型凝析气田的发现及勘探意义[J].中国石油勘探,2019,24(1):36-45. Shi Hesheng, Wang Qingbin, Wang Jun, Liu Xiaojian, Feng Chong, Hao Yiwei, et al. Discovery and exploration significance of large condensate gas fields in BZ19-6 structure in deep Bozhong sag[J]. China Petroleum Exploration, 2019, 24(1):36-45.