Abstract:With high cost and risk of developing the L gas field in the deep-water central valley in the Qiongdongnan Basin, it is necessary to precisely prove the geological reserves of the gas field. However, the calibrated results from wells A and B to the channel wall are completely opposite, and affect the defination of the structure boundary and the reserves. Based on a variety of data, we studied the sedimentary evolution of the canyon channel wall, determined its seismic response characteristics through forward simulation on three models, and finally confirmed its rationality on field data. The results show that there is a pressure isolating layer with high velocity, high density, high resistivity and high gamma between two different formation pressure systems inside and outside the central canyon channel wall. The top of the isolating layer is the canyon channel wall, and the bottom of the isolating layer is the formation pressure boundary. They are, respectively, the responses of seismic crest and trough. The determination of seismic response characteristics of the channel wall and the formation pressure boundary in the South China Sea is conducive to proving the geological reserves of natural gas and effectively predicting key points of formation pressure before drilling operation in the future.
廖仪, 刘巍, 马光克, 邓海东, 李雷. 深水中央峡谷水道壁综合识别[J]. 石油地球物理勘探, 2021, 56(2): 332-339,355.
LIAO Yi, LIU Wei, MA Guangke, DENG Haidong, LI Lei. Study on recognizing the channel wall of the deep-water central valley in the South China Sea. Oil Geophysical Prospecting, 2021, 56(2): 332-339,355.
王振峰,裴健翔,郝德峰,等.莺-琼盆地中新统大型重力流储集体发育条件、沉积特征及天然气勘探有利方向[J].中国海上油气,2015,27(4):13-21.WANG Zhenfeng,PEI Jianxiang,HAO Defeng,et al. Development conditions,sedimentary characteristics of Miocene large gravity flow reservoirs and the favorable gas exploration directions in Ying-Qiong basin[J].China Offshore Oil and Gas,2015,27(4):13-21.
[2]
王振峰.深水重要油气储层:琼东南盆地中央峡谷体系[J].沉积学报,2012,30(4):646-653.WANG Zhenfeng.Important deep water hydrocarbon reservoirs:the central canyon system in the Qiongdongnan Basin[J].Acta Sedimentologica Sinica,2012,30(4):646-653.
[3]
姚悦,周江羽,雷振宇,等.西沙海槽盆地强限制性中央峡谷水道地震相与内部结构的分段特征[J].沉积学报,2018,36(4):787-795.YAO Yue,ZHOU Jiangyu,LEI Zhenyu,et al.High restriction seismic facies and inner structural segmentation features of the central canyon channel systems in Xisha Trough Basin[J].Acta Sedimentologica Sinica,2018,36(4):787-795.
[4]
许怀智,蔡东升,孙志鹏,等.琼东南盆地中央峡谷沉积充填特征及油气地质意义[J].地质学报,2012,86(4):641-650.XU Huaizhi,CAI Dongsheng,SUN Zhipeng,et al.Fi-lling characters of central submarine canyon of Qiongdongnan basin and its significance of petroleum geology[J].Acta Geological Sinica,2012,86(4):641-650.
[5]
李超,陈国俊,沈怀磊,等.琼东南盆地中央峡谷沉积充填特征与储层分布规律[J].石油学报,2013,34(增2):74-82.LI Chao,CHEN Guojun,SHEN Huailei,et al.Depo-sitinal filling and reservoir distribution patterns of the central canyon in Qiongdongnan basin[J].Acta Petrolei Sinica,2013,34(S2):74-82.
[6]
陈奎,杨希冰,胡林,等.琼东南盆地深水勘探成熟区目标搜索技术体系研究及应用成效[J].中国海上油气,2020,32(3):33-42.CHEN Kui,YANG Xibing,HU Lin,et al.Study of the target search technical system in mature deep water exploration area of Qiongdongnan basin and application effect[J].China Offshore Oil and Gas,2020,32(3):33-42.
[7]
李冬,徐强,王永凤,等.琼东南盆地中央峡谷西段充填体系沉积演化与砂体分布[J].石油地球物理勘探,2013,48(5):799-803.LI Dong,XU Qiang,WANG Yongfeng,et al.Filling evolution and sand distribution in the west part of Central Canyon,Qiongdongnan Basin[J].Oil Geophysical Prospecting,2013,48(5):799-803.
[8]
谢玉洪.南海北部自营深水天然气勘探重大突破及其启示[J].天然气工业,2014,34(10):1-8.XIE Yuhong.A major breakthrough in deepwater na-tural gas exploration in a self-run oil/gas field in the northern South China Sea and its enlightenment[J].Natural Gas Industry,2014,34(10):1-8.
[9]
高永德,孙殿强,陈鸣,等.陵水17-2深水气田黄流组重力流沉积特征及模式[J].中国海上油气,2018,30(1):22-30.GAO Yongde,SUN Dianqiang,CHEN Ming,et al.Gravity flow sedimentary characteristics and patterns of Huangliu Formation in LS17-2 deep water gas field[J].China Offshore Oil and Gas,2018,30(1):22-30.
[10]
解习农,陈志宏,孙志鹏,等.南海西北陆缘深水沉积体系内部构成特征[J].地球科学(中国地质大学学报),2012,37(4):627-634.XIE Xinong,CHEN Zhihong,SUN Zhipeng,et al. Depositional architecture characteristics of deepwater depositional systems on the continental margins of Northwestern South China Sea[J].Earth Science:Journal of China University of Geosciences,2012,37(4):627-634.
[11]
孙武亮,孙开峰.地震地层压力预测综述[J].勘探地球物理进展,2007,30(6):428-432.SUN Wuliang,SUN Kaifeng.Review of pore-pressure prediction from seismic data[J].Progress in Exploration Geophysics,2007,30(6):428-432.
[12]
Sayers C M.An introduction to velocity-based pore-pressure estimation[J].The Leading Edge,2006,25(12):1496-1499.
[13]
王文枫,岳大力,赵继勇,等.利用地震正演模拟方法研究地层结构——以鄂尔多斯盆地合水地区延长组三段为例[J].石油地球物理勘探,2020,55(2):411-418.WANG Wenfeng,YUE Dali,ZHAO Jiyong,et al.Research on stratigraphic structure based on seismic forward modeling:A case study of the third member of the Yanchang Formation in Heshui area,Ordos Basin[J].Oil Geophysical Prospecting,2020,55(2):411-418.
[14]
杨静,张雷,王九拴,等.基于模型正演的天然气水合物定量描述[J].石油地球物理勘探,2020,55(2):419-425.YANG Jing,ZHANG Lei,WANG Jiushuan,et al.Quantitative characterization of gas hydrate based on forward modeling[J].Oil Geophysical Prospecting,2020,55(2):419-425.
[15]
刘立彬,王延光,孙成禹.基于正演模型的砂泥岩薄互层AVO特征分析[J].石油地球物理勘探,2019,54(6):1246-1253.LIU Libin,WANG Yanguang,SUN Chengyu.Thin inter-bed AVO characteristics analysis based on forward model[J].Oil Geophysical Prospecting,2019,54(6):1246-1253.
[16]
李庆忠.走向精确勘探的道路——高分辨率地震勘探系统工程剖析[M].北京:石油工业出版社,1993.LI Qingzhong.The Way to Obtain A Better Resolution in Seismic Prospecting:A Systematical Analysis of High Resolution Seismic Exploration[M].Petroleum Industry Press,Beijing,1993.
[17]
赵宝银,陈思远,陶钰,等.应用宽带Ricker子波的期望目标频谱整形[J].石油地球物理勘探,2020,55(3):541-547.ZHAO Baoyin,CHEN Siyuan,TAO Yu,et al.Spectrum shaping of desired targets based on broadband Ricker wavelets[J].Oil Geophysical Prospecting,2020,55(3):541-547.
[18]
刘桃,刘景东.欠压实与流体膨胀成因超压的定量评价[J].石油学报,2018,39(9):971-979.LIU Tao,LIU Jingdong.Quantitative evaluation on overpressure generated from undercompaction and fluid expansion[J].Acta Petrolei Sinica,2018,39(9):971-979.
[19]
王星星,王英民,高胜美,等.深水重力流模拟研究进展及对海洋油气开发的启示[J].中国矿业大学学报,2018,47(3):133-147.WANG Xingxing,WANG Yingmin,GAO Shengmei,et al. Advancements of the deep-water gravity flow simulations and their implications for exploitation of marine petroleum[J].Journal of China University of Mining & Technology,2018,47(3):133-147.
[20]
Bass J H,Manica R,Puhl E,et al.Thresholds of intrabed flow and other interactions of turbidity currents with soft muddy substrates[J].Sedimentology,2016,63(7):2002-2036.
[21]
Baas J H,Manica R,Puhl E,et al.Processes and products of turbidity currents entering soft muddy substrates[J].Geology,2014,42(5):371-374.
[22]
Verhagen I,Baas J H,Jacinto R S,et al.A first classification scheme of flow-bed interaction for clay-laden density currents and soft substrates[J].Ocean Dynamics,2013,63(4):384-397.
[23]
张国栋.南海西部深水区陵水17-2气田气藏描述地球物理关键技术[D].吉林长春:吉林大学,2016.ZHANG Guodong.The Geophysical Key Technologies of Lingshui 17-2 Gas Field Gas Reservoir Description in the Western Deepwater Area of the South China Sea[D].Jilin University,Changchun,Jilin,2016.