Abstract：The Xihu Sag of the East China Sea Shelf Basin is an area with great potential for exploring thick gas reservoirs with low permeability.The prediction of sweet spots is the key to the development of the reservoir.However，it is difficult to predict sweet spots of thick reservoirs with strong heterogeneity.The geophysical prediction technology and methods of different types of sweet spots are established for offshore thick gas reservoirs with low permeability.Firstly，based on the classification of sweet spots，rock physics and seismic forward modeling analyses are carried out to clarify the sensitive rock physics parameters and seismic response characteristics of sweet spots.Then，the appropriate pre-stack elastic inversion methods are selected to predict the spatial distribution of different types of sweet spots.The research results show that sweet spots of class I can be well characterized by direct inversion of P-wave modulus，and sweet spots of class Ⅱ can be well characterized by pseudo P-and S-wave velocity ratio inversion.The predicted thickness of the sweet spot before drilling is highly consistent with the actual drilling thickness of the development well.In addition，the coincidence rate of the sweet spot of class I is more than 80%，and that of class Ⅱis more than 70%.In conclusion，the method for sweet spot prediction is effective and highly accurate，and it has certain reference significance in the development of similar gas fields.
何贤科, 娄敏, 涂齐催, 李炳颖, 蔡华. 厚层低渗气藏“甜点”预测——以东海陆架盆地西湖凹陷Z气田花港组为例[J]. 石油地球物理勘探, 2023, 58(6): 1410-1422.
HE Xianke, LOU Min, TU Qicui, LI Bingying, CAI Hua. Sweet spot prediction in thick gas reservoirs with low permeability in Huagang Formation of Z gasfield in Xihu Sag， East China Sea Shelf Basin. Oil Geophysical Prospecting, 2023, 58(6): 1410-1422.
张国华.西湖凹陷高压形成机制及其对油气成藏的影响[J].中国海上油气,2013,25(2):1-8.ZHANG Guohua.Origin mechanism of high formation pressure and its influence on hydrocarbon accumulation in Xihu sag[J].China Offshore Oil and Gas,2013,25(2):1-8.
[2]
叶加仁,刘金水,徐陈杰,等.东海盆地西湖凹陷西次凹天然气资源分级评价[J].地质科技通报,2020,39(3):1-9.YE Jiaren,LIU Jinshui,XU Chenjie,et al.Grading evaluation of natural gas resources in the western sub-sag of Xihu Depression,East China Sea Basin[J].Bulletin of Geological Science and Technology,2020,39(3):1-9.
[3]
张少龙,闫建平,郭伟,等.基于岩石物理相的深层页岩气地质—工程甜点参数测井评价方法——以四川盆地LZ区块五峰组—龙马溪组为例[J].石油地球物理勘探,2023,58(1):214-227.ZHANG Shaolong,YAN Jianping,GUO Wei,et al.Logging evaluation method of geological-engineering sweet spot parameters for deep shale gas based on petrophysical facies:a case study of the Wufeng-Longmaxi Formation in LZ block of Sichuan Basin[J].Oil Geophysical Prospecting,2023,58(1):214-227.
[4]
陈国文,覃素华,刘雷颂,等.辽河坳陷大民屯凹陷沙四段页岩油 “甜点” 预测及评价[J].石油地球物理勘探,2022,57(增刊1):145-153.CHEN Guowen,QIN Suhua,LIU Leisong,et al.Prediction and evaluation of sweet spots for shale oil in Es4 of Damintun Sag,Liaohe Depression[J].Oil Geophysical Prospecting,2022,57(S1):145-153.
[5]
霍丽娜,徐礼贵,邵林海,等.煤层气“甜点区” 地震预测技术及其应用[J].天然气工业,2014,34(8):46-52.HUO Lina,XU Ligui,SHAO Linhai,et al.Seismic prediction technologies of CBM sweet spots and their application[J].Natural Gas Industry,2014,34(8):46-52.
[6]
李岳桐,卢宗盛,吴振东,等.沧东凹陷孔二段细粒沉积岩致密油甜点预测[J].石油地球物理勘探,2018,53(5):1059-1066.LI Yuetong,LU Zongsheng,WU Zhendong,et al.Sweet spot prediction for fine-grain sediment reservoirs in the Cangdong Sag[J].Oil Geophysical Prospecting,2018,53(5):1059-1066.
[7]
李国斌,张亚军,谢天峰,等.煤系地层致密砂岩气甜点区地震逐级预测——以鄂尔多斯盆地东南缘下二叠统山西组2~3亚段为例[J].天然气工业,2020,40(5):34-42.LI Guobin,ZHANG Yajun,XIE Tianfeng,et al.Seismic stepped prediction technology for tight sandstone gas sweet spot in coal measure strata:a case study of the Submember 2~3 of the Lower Permian Shanxi Formation along the southeastern margin of the Ordos Basin[J].Natural Gas Industry,2020,40(5):34-42.
[8]
郭贵安,关旭,肖富森,等.四川盆地中部侏罗系沙溪庙组致密砂岩气藏地震一体化描述技术[J].天然气工业,2022,42(1):40-50.GUO Guian,GUAN Xu,XIAO Fusen,et al.Integrated seismic description technology for tight sandstone gas reservoir of Jurassic Shaximiao Formation in the central Sichuan Basin[J].Natural Gas Industry,2022,42(1):40-50.
[9]
赵爽,高倩,谯述容.川西DY地区三叠系须家河组二段地震相分析与沉积相预测[J].石油地球物理勘探,2009,44(3):341-346.ZHAO Shuang,GAO Qian,QIAO Shurong.Analysis on Triassic Xujiahe stage second segment (Tx2) seismic facies and prediction of sedimentary facies in Chuanxi DY Area[J].Oil Geophysical Prospecting,2009,44(3):341-346.
[10]
何晓菊,郭亚斌.鄂尔多斯盆地苏里格庙地区上古生界砂岩储层预测技术和效果[J].石油地球物理勘探,2002,37(增刊1):9-13.HE Xiaoju,GUO Yabin.Prediction of Upper Paleozoic sandstone reservoir in Suligemiao area,Ordos Basin[J].Oil Geophysical Prospecting,2002,37(S1):9-13.
[11]
杨海军,李勇,唐雁刚,等.塔里木盆地克深气田成藏条件及勘探开发关键技术[J].石油学报,2021,42(3):399-414.YANG Haijun,LI Yong,TANG Yangang,et al.Accumulation conditions,key exploration and development technologies for Keshen gas field in Tarim Basin[J].Acta Petrolei Sinica,2021,42(3):399-414.
[12]
付宁海,唐海发,刘群明.低渗―致密砂岩气藏开发中后期精细调整技术[J].西南石油大学学报(自然科学版),2018,40(3):136-145.FU Ninghai,TANG Haifa,LIU Qunming.Technologies for fine adjustment in the middle-later development stage of low permeability tight sandstone gas reservoirs[J].Journal of Southwest Petroleum University (Science & Technology Edition),2018,40(3):136-145.
[13]
刘勇,徐国盛,曾兵,等.东海盆地西湖凹陷花港组储层孔隙演化与油气充注关系[J].石油实验地质,2018,40(2):168-176.LIU Yong,XU Guosheng,ZENG Bing,et al.Relationship between porosity evolution and hydrocarbon charging in tight sandstone reservoirs in Oligocene Huagang Formation,Xihu Sag,East China Sea Basin[J].Petroleum Geology and Experiment,2018,40(2):168-176.
[14]
徐国盛,崔恒远,刘勇,等.东海盆地西湖凹陷古近系花港组砂岩储层致密化与油气充注关系[J].地质科技通报,2020,39(3):20-29.XU Guosheng,CUI Hengyuan,LIU Yong,et al.Relationship between sandstone reservoirs densification and hydrocarbon charging in the Paleogene Huagang Formation of Xihu Depression,East China Sea Basin[J].Bulletin of Geological Science and Technology,2020,39(3):20-29.
[15]
张武,蒋一鸣,肖晓光,等.东海陆架盆地西湖凹陷中北部花港组储层致密化过程分析[J].石油实验地质,2021,43(1):86-95.ZHANG Wu,JIANG Yiming,XIAO Xiaoguang,et al.Densification process of Huagang Formation in northern and central Xihu Sag of East China Sea Shelf Basin[J].Petroleum Geology and Experiment,2021,43(1):86-95.
[16]
林承焰,孙小龙,马存飞,等.西湖凹陷中央反转构造带花港组储层物性演化[J].中国矿业大学学报,2017,46(4):820-829.LIN Chengyan,SUN Xiaolong,MA Cunfei,et al.Physical property evolution of Huagang formation in central inversion tectonic belt in Xihu Depression[J].Journal of China University of Mining & Technology,2017,46(4):820-829.
[17]
赵仲祥,董春梅,林承焰,等.西湖凹陷深层低渗―致密气藏 “甜点” 类型划分及成因探讨[J].石油与天然气地质,2018,39(4):778-790.ZHAO Zhongxiang,DONG Chunmei,LIN Chengyan,et al.Classification and origin of “sweet spots” in deep low permeability tight gas reservoirs,Xihu Sag,East China Sea Shelf Basin[J].Oil & Gas Geology,2018,39(4):778-790.
[18]
张武,侯国伟,肖晓光,等.西湖凹陷低渗储层成因及优质储层主控因素[J].中国海上油气,2019,31(3):40-49.ZHANG Wu,HOU Guowei,XIAO Xiaoguang,et al.Genesis of low permeability reservoirs and main controlling factors of high quality reservoirs in Xihu Sag,East China Sea Basin[J].China Offshore Oil and Gas,2019,31(3):40-49.
[19]
王猛,刘志杰,杨玉卿,等.西湖凹陷花港组储层综合分类方法探讨[J].现代地质,2020,34(6):1214-1220.WANG Meng,LIU Zhijie,YANG Yuqing,et al.Comprehensive classification scheme of Huagang reservoir in Xihu Depression[J].Geoscience,2020,34(6):1214-1220.
[20]
李久娣,孙莉,魏水建,等.东海海域深层HG组低渗储层 “甜点” 预测方法及应用[J].石油物探,2019,58(5):758-765.LI Jiudi,SUN Li,WEI Shuijian,et al.“sweet spot”prediction and its application in the low permeability reservoir of the deep HG formation in the East China Sea[J].Geophysical Prospecting for Petroleum,2019,58(5):758-765.
[21]
李久娣.东海西湖N区块致密砂岩气藏甜点预测研究[J].石油物探,2019,58(3):444-452.LI Jiudi.“Sweet Spot” prediction of a tight sandstone gas reservoir in the N Block in Xihu Sag,China[J].Geophysical Prospecting for Petroleum,2019,58(3):444-452.
[22]
娄敏,蔡华,何贤科,等.地震沉积学在东海陆架盆地西湖凹陷河流―三角洲相储集层刻画中的应用[J].石油勘探与开发,2023,50(1):125-138.LOU Min,CAI Hua,HE Xianke,et al.Application of seismic sedimentology in characterization of fluvial-deltaic reservoirs in Xihu Sag,East China Sea Shelf Basin[J].Petroleum Exploration and Development,2023,50(1):125-138.
[23]
毛云新,娄敏.河流相储层刻画与垂向非均质性分析——以西湖凹陷C油田柳浪组为例[J].东北石油大学学报,2021,45(5):51-62.MAO Yunxin,LOU Min.Fluvial reservoir characterization and vertical heterogeneity analysis:taking Liulang Formation of C Oilfield in Xihu Depression as example[J].Journal of Northeast Petroleum University,2021,45(5):51-62.
[24]
娄敏,刘江,涂齐催,等.河流—三角洲相不同厚度储层的地震沉积学研究[J].地球物理学进展,2021,36(5):2191-2203.LOU Min,LIU Jiang,TU Qicui,et al.Application of seismic sedimentology to the prediction of fluvial-delta facies reservoirs with different thickness[J].Progress in Geophysics,2021,36(5):2191-2203.
[25]
WANG W,LIN C,ZHANG X,et al.Provenance,clastic composition and their impact on diagenesis:a case study of the Oligocene sandstone in the Xihu Sag,East China Sea Basin[J].Marine and Petroleum Geology,2021,126:104890.
[26]
ZENG F,DONG C,LIN C,et al.Pore structure characteristics of reservoirs of Xihu Sag in East China Sea Shelf Basin based on dual resolution X-ray computed tomography and their influence on permeability[J].Energy,2022,239(Part D):122386.
[27]
ZHAO Z,DONG C,ZHANG X,et al.Reservoir controlling factors of the Paleogene Oligocene Huagang Formation in the north central part of the Xihu Depression,East China Sea Basin,China[J].Journal of Petroleum Science and Engineering,2019,175:159-172.
[28]
ZENG F,DONG C,LIN C,et al.Analyzing the effects of multi-scale pore systems on reservoir Properties:a case study on Xihu Depression,East China Sea Shelf Basin,China[J].Journal of Petroleum Science and Engineering,2021,203:108609.
[29]
WANG W,LIN C,ZHANG X,et al.Seismic diagenetic facies prediction of tight sandstone in the offshore sparse well area:an example from the Xihu Depression of the East China Sea Basin[J].Journal of Petroleum Science and Engineering,2022,216:110825.
[30]
WANG W,LIN C,ZHANG X,et al.Effect of burial history on diagenetic and reservoir-forming process of the Oligocene sandstone in Xihu sag,East China Sea Basin[J].Marine and Petroleum Geology,2020,112:104034.
