1.China National Offshore Oil Limited Corporation-Zhanjiang，Zhanjiang 524057，China；2.School of Geosciences in China University of Petroleum，Qingdao 266580，China
The canyon-channel is a kind of important target for increasing reserves in Qiongdongnan Basin.Currently，the proved gas reserves of canyon channels in Ledong-Lingshui Sag has taken up 70% of the total proved storage in whole Qiongdongnan Basin.In order to analyze formation mechanism of canyon-channel，based on rock thin section，petrophysics data，scanning electron microscope(SEM)，clay X-ray diffraction，fluid inclusion，as well as other data，the diagenesis and porosity evolution of the Huangliu Formation canyon-channel reservoir have been studied，the difference of diagenetic evolution in various areas has been ascertained，the paragenetic sequence has been confirmed，pore evolution mode for canyon-channel has been eventually built.The results show that canyon-channel sandstones have experienced compaction，cementation，dissolution，and other diagenesis processes，and now are in mesodiagenesis A stage.The diagenetic sequence was：early clay mineral precipitation；feldspar microdissolution；quartz overgrowth and feldspar intense dissolution；ferrocalcite and dolomite cementation；quartz and quartz overgrowth dissolution；microdissolution of carbonate cement.Besides，the porosity evolution in Yacheng A/B area displays characteristics of “obvious porosity reduction via compaction；porosity reduction via sillceous and carbonate cement，porosity increase via dissolution of feldspar and ferrocalcite” and the porosity evolution in Lingshui Z/X area shows the features of “porosity reduction via compaction；porosity reduction via ferrocalcite cementation；slight porosity increase via dissolution of felsic”.
［1］Su Ming，Li Junliang，Jiang Tao，et al.Morphological features and formation mechanism of Central Canyon in the Qiongdongnan Basin，northern South China Sea[J].Marine Geology & Quaternary Geology，2009，29(4)：85-93.
苏明，李俊良，姜涛，等.琼东南盆地中央峡谷的形态及成因[J].海洋地质与第四纪地质，2009，29(4)：85-93.
[2]Lin Changsong，Liu Jingyan，Cai Shixiang，et al.Sedimentation and evolution background old large incised channel and submarine gravity flow system in Ying-Qiong Basin[J].Chinese Science Bulletin，2001，46(1)：69-72.
林畅松，刘景彦，蔡世祥，等.莺—琼盆地大型下切谷和海底重力流体系的沉积构成和发育背景[J].科学通报，2001，46(1)：69-72.
[3]Yao Zhe，Wang Zhenfeng，Zuo Qianmei，et al.Critical factors for the formation of large-scale deepwater gas field in Central Canyon System of southeast Hainan Basin and its exploration potential[J].Acta Petrolei Sinica，2015，36(11)：1358-1366.
姚哲，王振峰，左倩媚，等.琼东南盆地中央峡谷深水大气田形成关键要素与勘探前景[J].石油学报，2015，36(11)：1358-1366.
[4]Wang Zhenfeng.Important deepwater hydrocarbon reservoirs：The Central Canyon System in the Qiongdongnan Basin[J].Acta Sedimentologica Sinica，2012，30(4)：646-652.
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)：646-652.
[5]Su Ming，Xie Xinong，Wang Zhenfeng，et al.Sedimentary evolution of the Central Canyon System in Qiongdongnan Basin,northern South China Sea[J].Acta Petrolei Sinica，2013，5(3)：467-478.
苏明，解习农，王振峰，等.南海北部琼东南盆地中央峡谷体系沉积演化[J].石油学报，2013，5(3)：467-478.
[6]Li Dong，Wang Yingmin，Wang Yongfeng，et al.The sedimentary and foreground of prospect for levee-overbankin Central Canyon，Qiongdongnan Basin[J].Acta Sedimentologica Sinica，2011，29(4)：689-694.李冬，王英民，王永凤，等.琼东南盆地中央峡谷深水天然堤—溢岸沉积[J].沉积学报，2011，29(4)：689-694.
[7]Zhang Daojun，Zhang Yingzhao，Shao Lei，et al.Sedimentary provenance in the Central Canyon of Qiongdongnan Basin in the northern South China Sea[J].Natural Gas Geoscience，2017，28(10):1574-1581.
张道军，张迎朝，邵磊，等.琼东南盆地中央峡谷沉积物源探讨[J].天然气地球科学，2017，28(10):1574-1581.
[8]Yin Na，Yang Haizhang，Ma Ming，et al.Provenance of Central Canyon in the Upper Miocene to the Pliocene in Qiongdongnan Basin[J].Natural Gas Geoscience，2017，28(10):1582-1592.
尹娜，杨海长，马明，等.琼东南盆地上中新统—上新统中央峡谷沉积物来源[J].天然气地球科学，2017，28(10):1582-1592.
[9]You Li，Wang Zhenfeng，Zhong Jia，et al.Reservoir characteristics and influential factors of the Huangliu Formation canyon channel in the Ledong-Lingshui Sag，Qiongdongnan Basin[J].Natural Gas Industry，2015，35(10)：31-38.
尤丽，王振峰，钟佳，等.乐东—陵水凹陷黄流组峡谷水道储层特征及影响因素[J].天然气工业，2015，35(10)：31-38.
[10]Wang Zisong，Liu Zhen，Wang Zhenfeng，et al.Distribution characteristics of abnormal pressure in central depression belt deepwater area，Qiongdongnan(southeast Hainan)Basin[J].Acta Geoscientica Sinica，2014，35(3)：355-364.
王子嵩，刘震，王振峰，等.琼东南盆地深水区中央坳陷带异常压力分布特征[J].地球学报，2014，35(3)：355-364.
[11]Ma Ming，Chen Guojun，Li Chao，et al.Quantitative analysis porosity evolution and formation mechanism of good reservoir in Enping Formation，Baiyun Sag，Pearl River Mouth Basin[J].Natural Gas Geoscience，2017，28(10):1515-1526.
马明，陈国俊，李超，等.珠江口盆地白云凹陷恩平组储层成岩作用与孔隙演化定量表征[J].天然气地球科学，2017，28(10):1515-1526.
[12]Beard D C，Weyl P K.Influence of texture on porosity and permeability of unsolidated sand［J］.AAPG Bulletin，1973，57(2)：349-369.
[13]Scherer M.Parameters influencing porosity in sandstones：A model forsandstone porosity predication［J］.AAPG Bulletin，1987，71(5):485-491.
[14]Petroleum and Natural Gas Industry Standards of People’s Republic of China.SY/T5477-2003 Diagenesis Stage Division of Clastic Sandstones[S].Beijing：Petroleum Industry Press，2003：1-9.
中华人民共和国石油天然气行业标准.SY/T5477-2003碎屑岩成岩阶段划分[S].北京:石油工业出版社，2003：1-9.
[15]Zhang Gongcheng，Zeng Qingbo，Su Long，et al.Accumulation mechanism of LS 17-2 deep water giant gas field in Qiongdongnan Basin[J].Acta Petrolei Sinica，2016，37(supplement 1)：34-46.
张功成，曾清波，苏龙,等.琼东南盆地深水区陵水17-2大气田成藏机理[J].石油学报，2016，37(增刊1):34-46.
[16]Xu Xinde，Zhang Yingzhao，Liang Gang，et al.Hydrocarbon source condition and accumulation mechanism of natural gas in deepwater area of Qiongdongnan Basin，northern South China Sea[J].Natural Gas Geoscience，2016，27(11):1985-1992.
徐新德，张迎朝，梁刚,等.南海北部琼东南盆地深水区烃源条件及天然气成藏机制[J].天然气地球科学，2016，27(11):1985-1992.
[17]Wang Xinxin，Zheng Rongcai，Yang Baoquan，et al.Diagenesis and diagenetic facies of submarine fan in Zhujiang Formation，Pearl River Mouth Basin[J].Acta Sedimentologica Sinica，2012，30(3)：451-458.
王欣欣，郑荣才，杨宝泉，等.白云凹陷珠江组深水扇成岩作用与成岩相分析[J].沉积学报，2012，30(3)：451-458.
[18]Hu Caizhi，Zhang Likuan，Luo Xiaorong，et al.Diagenesis and porosity evolution of the low-porosity and low-permeability sandstones:Evidence from the Lower Jurassic Sangonghe Formation in Moxizhuang area,Central Junggar Basin[J].Natural Gas Geoscience，2015，26(12):2254-2266.
胡才志，张立宽，罗晓容,等.准噶尔盆地腹部莫西庄地区三工河组低孔渗砂岩储层成岩与孔隙演化研究[J].天然气地球科学，2015，26(12):2254-2266.
[19]Wei Wei，Jiang Youlu，Yang Dexiang，et al.Coupling relationship between diagenetic evolution of sandstone reservoirs and hydrocarbon accumulation in Palaeogene in Hejian trough，Raoyang Depression，Bohai Bay Basin,China[J].Natural Gas Geoscience，2016，27(8):1477-1488.
魏玮，蒋有录，杨德相,等.渤海湾盆地饶阳凹陷河间洼槽古近系砂岩储层成岩—成藏耦合关系[J].天然气地球科学，2016，27(8):1477-1488.
[20]Li Wei，Wen Zhigang，Dou Lirong，et al.Coupling relationship between tight oil and gas accumulation and compacting history in southwestern Ordos Basin，China[J].Natural Gas Geoscience，2017，28(6):920-929.
李威，文志刚，窦立荣,等.鄂尔多斯盆地西南地区油气富集与储层演化史[J].天然气地球科学，2017，28(6):920-929.
[21]Cao Yingchang，Xi Kelai，Wang Yanzhong，et al.Quantitative research on porosity evolution of reservoirs in the member 4 of Paleogene Shahejie Formation in Hexiwu structural zone of Langgu Sag，Jizhong Depression[J].Journal of Palaeogeography，2013，15(5)：593-601.
操应长，葸克来，王艳忠，等.冀中坳陷廊固凹陷河西务构造带古近系沙河街组四段储集层孔隙度演化定量研究[J].古地理学报，2013，15(5)：593-601.
[22]Wang Yanzhong，Cao Yingchang，Xi Kelai，et al.A recovery method for porosity evolution of clastic reservoirs with geological time：A case study from the upper submember of Es4 in the Dongying Depression，Jiyang Subbasin[J].Acta Petrolei Sinica，2013，34(6)：1100-1111.
王艳忠，操应长，葸克来，等.碎屑岩储层地质历史时期孔隙度演化恢复方法——以济阳坳陷东营凹陷沙河街组四段上亚段为例[J].石油学报，2013，34(6)：1100-1111.
