珠江口盆地北部坳陷带文昌组地震反射特征及沉积环境分析
|
摘要
珠江口盆地北部坳陷带文昌组分布广泛,是该区主要烃源岩发育层段。对文昌组的划分以及分布规律的认识,是洼陷评价的基础。通过井—震标定,从单井资料入手,结合地震反射特征分析,认为文昌组顶、底界面在洼陷边缘为不整合面,洼陷中央为整合面,具有4种类型;根据井—震标定将文昌组分为2~3段,洼陷陡坡带发育扇三角洲相(楔状、杂乱、弱反射)和冲积扇(楔状、杂乱、强反射),深陷带发育滨浅湖相(中—低频、中等连续性、弱反射)和中深湖相(低频、连续、强反射),缓坡带发育三角洲相(前积结构、中—高频、中等连续、中—弱反射);文昌组沉积物纵向表现为粗—细—粗的特征,洼陷底部为冲积扇—扇三角洲相,中部过渡为滨浅湖—中深湖相,顶部为扇三角洲—滨浅湖相。受物源、水体以及后期剥蚀作用,不同洼陷沉积环境不同。
The source rock of Wenchang Formation is widely distributed in northern depression of Zhujiangkou basin.The recognition of division and distribution rules is the base of sag evaluation.Based on correlation of well data and seismic reflection,we hold that the top boundary and the bottom boundary of Wenchang Formation are unconformities but conformities towards sag center.The characters of Wenchang Formation boundaries can be divided into four types.Wenchang Formation can be divided into two-three segments on the base of seismic reflection.Through seismic facies and sedimentary environment analysis,we can recognize fan delta(wedgelike,clutter,weak reflection) and alluvial fan(wedgelike,clutter,bright reflection) in the actic region,lacustrine facies(low-frequency,continue,weak to bright reflection towards sag center) in the center of sag and delat(high-frequency,middle continue,weak reflection) in the slope region.Owing to tectonic activities′s diversity,size of grain of sediments is coarse-fine-coarse.
The source rock of Wenchang Formation is widely distributed in northern depression of Zhujiangkou basin.The recognition of division and distribution rules is the base of sag evaluation.Based on correlation of well data and seismic reflection,we hold that the top boundary and the bottom boundary of Wenchang Formation are unconformities but conformities towards sag center.The characters of Wenchang Formation boundaries can be divided into four types.Wenchang Formation can be divided into two-three segments on the base of seismic reflection.Through seismic facies and sedimentary environment analysis,we can recognize fan delta(wedgelike,clutter,weak reflection) and alluvial fan(wedgelike,clutter,bright reflection) in the actic region,lacustrine facies(low-frequency,continue,weak to bright reflection towards sag center) in the center of sag and delat(high-frequency,middle continue,weak reflection) in the slope region.Owing to tectonic activities′s diversity,size of grain of sediments is coarse-fine-coarse.
引文
[1]Gong Zaisheng,Li Sitian.Dynamic Research of Oil and Gas Ac-cumulation in Northern Marginal Basins of South China Sea[M].Beijing:Science Press,2004:9-25.[龚再升,李思田.南海北部大陆边缘盆地油气成藏动力学研究[M].北京:科学出版社,2004:9-25.]
[2]Zhu Weilin,Zhang Gongcheng,Gao Le.Geological characteristicsand exploration objectives of hydrocarbons in the northern conti-nental margin basin of South China Sea[J].Acta Petrolei Sinica,2008,29(1):1-9.[朱伟林,张功成,高乐.南海北部大陆边缘盆地油气地质特征与勘探方向[J].石油学报,2008,29(1):1-9.]
[3]Zhu Weilin,Wang Zhenfeng,Zhang Yingchao.Non-structural res-ervoirs in northern shelf basins of South China Sea[J].Oil&GasGeology,2004,25(4):408-415.[朱伟林,王振峰,张迎朝.南海北部陆架盆地非构造油气藏[J].石油与天然气地质,2004,25(4):408-415.]
[4]Zhu Weilin,Mi Lijun,Gao Yangdong.Recent features and futuredirections of offshore hydrocarbon exploration in China[J].ChinaOffshore Oil and Gas,2009,21(1):1-8.[朱伟林,米立军,高阳东.中国近海近几年油气勘探特点及今后勘探方向[J].中国海上油气,2009,21(1):1-8.]
[5]Zhu Weilin.Advancements of oil and gas exploration in China off-shore area:Overview and perspective[J].Engineering Sciences,2010,12(5):18-24.[朱伟林.中国近海油气勘探进展[J].中国工程科学,2010,12(5):18-24.]
[6]Liu Congyin,Zhou Pingbin,Zeng Yi.An analysis of the main con-trols on Neogene hydrocarbon accumulation in Panyu 4 sag[J].China Offshore Oil and Gas,2009,21(2):91-94.[刘从印,周平兵,曾驿,等.番禺4洼地区新近系油气成藏主控因素分析[J].中国海上油气,2009,21(2):91-94.]
[7]Du Jiayuan,Shi Hesheng,Ding Lin.Division of hydrocarbon accu-mulation stages in Huizhou depression and their exploration signif-icance[J].China Offshore Oil and Gas,2009,21(4):221-226.[杜家元,施合生,丁琳,等.惠州洼陷油气成藏期次划分及其勘探意义[J].中国海上油气,2009,21(4):221-226.]
[8]Zhu Weilin,Li Mingbi,Wu Peikang.Petroleum system in ZhuⅢdepression of Pearl River mouth basin[J].Petroleum Explorationand Development,1997,24(6):21-26.[朱伟林,黎明碧,吴培康.珠江口盆地珠三坳陷石油体系[J].石油勘探与开发,1997,24(6):21-26.]
[9]Wang Chunxiu,Zhang Qunying.Typical oil and gas reservoirs andtheir forming conditions in ZhuⅢsag[J].China Offshore Oil andGas,1999,13(4):248-254.[王春修,张群英.珠三坳陷典型油气藏及成藏条件分析[J].中国海上油气:地质,1999,13(4):248-254.]
[10]Ma Wenhong,He Jiaxiong,Yao Yongjian.Characteristics of Tertiarysediments and main source rocks,northern South China Sea[J].Natural Gas Geoscience,2008,19(1):41-48.[马文宏,何家雄,姚永坚.南海北部边缘盆地第三系沉积及主要烃源岩发育特征[J].天然气地球科学,2008,19(1):41-48.]
[11]He Jiaxiong,Chen Shenghong,Yao Yongjian.Main genetic typesof oil&gas and characteristics of their accumulation and distribu-tion in north marginal basins,South China Sea[J].Natural GasGeoscience,2008,19(1):34-40.[何家雄,陈胜红,姚永坚.南海北部边缘盆地油气主要成因类型及运聚分布特征[J].天然气地球科学,2008,19(1):34-40.]
[12]Xia Bin,Lv Baofeng,Wu Guogan.The Cenozoic tectonic transportand its control on the source rock in the northern South China Sea[J].Natural Gas Geoscience,2007,18(5):629-634.[夏斌,吕宝凤,吴国干.南海北部新生代盆地构造迁移及其对烃源岩的制约作用[J].天然气地球科学,2007,18(5):629-634.]
[13]He Jiaxiong,Wu Wenhai,Zhu Youhai.Genetic types,migrationand accumulation of oil&gas and exploration proposal in northmarginal basins,South China Sea[J].Natural Gas Geoscience,2010,21(1):7-17.[何家雄,吴文海,祝有海.南海北部边缘盆地油气成因及运聚规律与勘探方向[J].天然气地球科学,2010,21(1):7-17.]
[14]Gan Jun,Zhang Yingchao,Deng Yong,et al.Main controls overPalaeogene natural gas accumulation and its exploration directionin Wenchang Asag,the western Pearl River mouth basin[J].Chi-na Offshore Oil and Gas,2009,21(6):367-371.[甘军,张迎朝,邓勇,等.珠江口盆地西部文昌A洼陷古近系天然气富集主控因素与勘探方向[J].中国海上油气,2009,21(6):367-371.]
[15]Vail P R,Posamentier HW.Sequence Stratigraphy:SequencesandSystems Tract Development[C]//James D P,Leckie D A.Se-quences,Stratigraphy,Sedimentology:Surface and Subsurface.Ca-nadian Society of Petroleum Geologists 15 Alberta:Canadian Saci-ety of Petroleum Geologists,1988:582-583.
[2]Zhu Weilin,Zhang Gongcheng,Gao Le.Geological characteristicsand exploration objectives of hydrocarbons in the northern conti-nental margin basin of South China Sea[J].Acta Petrolei Sinica,2008,29(1):1-9.[朱伟林,张功成,高乐.南海北部大陆边缘盆地油气地质特征与勘探方向[J].石油学报,2008,29(1):1-9.]
[3]Zhu Weilin,Wang Zhenfeng,Zhang Yingchao.Non-structural res-ervoirs in northern shelf basins of South China Sea[J].Oil&GasGeology,2004,25(4):408-415.[朱伟林,王振峰,张迎朝.南海北部陆架盆地非构造油气藏[J].石油与天然气地质,2004,25(4):408-415.]
[4]Zhu Weilin,Mi Lijun,Gao Yangdong.Recent features and futuredirections of offshore hydrocarbon exploration in China[J].ChinaOffshore Oil and Gas,2009,21(1):1-8.[朱伟林,米立军,高阳东.中国近海近几年油气勘探特点及今后勘探方向[J].中国海上油气,2009,21(1):1-8.]
[5]Zhu Weilin.Advancements of oil and gas exploration in China off-shore area:Overview and perspective[J].Engineering Sciences,2010,12(5):18-24.[朱伟林.中国近海油气勘探进展[J].中国工程科学,2010,12(5):18-24.]
[6]Liu Congyin,Zhou Pingbin,Zeng Yi.An analysis of the main con-trols on Neogene hydrocarbon accumulation in Panyu 4 sag[J].China Offshore Oil and Gas,2009,21(2):91-94.[刘从印,周平兵,曾驿,等.番禺4洼地区新近系油气成藏主控因素分析[J].中国海上油气,2009,21(2):91-94.]
[7]Du Jiayuan,Shi Hesheng,Ding Lin.Division of hydrocarbon accu-mulation stages in Huizhou depression and their exploration signif-icance[J].China Offshore Oil and Gas,2009,21(4):221-226.[杜家元,施合生,丁琳,等.惠州洼陷油气成藏期次划分及其勘探意义[J].中国海上油气,2009,21(4):221-226.]
[8]Zhu Weilin,Li Mingbi,Wu Peikang.Petroleum system in ZhuⅢdepression of Pearl River mouth basin[J].Petroleum Explorationand Development,1997,24(6):21-26.[朱伟林,黎明碧,吴培康.珠江口盆地珠三坳陷石油体系[J].石油勘探与开发,1997,24(6):21-26.]
[9]Wang Chunxiu,Zhang Qunying.Typical oil and gas reservoirs andtheir forming conditions in ZhuⅢsag[J].China Offshore Oil andGas,1999,13(4):248-254.[王春修,张群英.珠三坳陷典型油气藏及成藏条件分析[J].中国海上油气:地质,1999,13(4):248-254.]
[10]Ma Wenhong,He Jiaxiong,Yao Yongjian.Characteristics of Tertiarysediments and main source rocks,northern South China Sea[J].Natural Gas Geoscience,2008,19(1):41-48.[马文宏,何家雄,姚永坚.南海北部边缘盆地第三系沉积及主要烃源岩发育特征[J].天然气地球科学,2008,19(1):41-48.]
[11]He Jiaxiong,Chen Shenghong,Yao Yongjian.Main genetic typesof oil&gas and characteristics of their accumulation and distribu-tion in north marginal basins,South China Sea[J].Natural GasGeoscience,2008,19(1):34-40.[何家雄,陈胜红,姚永坚.南海北部边缘盆地油气主要成因类型及运聚分布特征[J].天然气地球科学,2008,19(1):34-40.]
[12]Xia Bin,Lv Baofeng,Wu Guogan.The Cenozoic tectonic transportand its control on the source rock in the northern South China Sea[J].Natural Gas Geoscience,2007,18(5):629-634.[夏斌,吕宝凤,吴国干.南海北部新生代盆地构造迁移及其对烃源岩的制约作用[J].天然气地球科学,2007,18(5):629-634.]
[13]He Jiaxiong,Wu Wenhai,Zhu Youhai.Genetic types,migrationand accumulation of oil&gas and exploration proposal in northmarginal basins,South China Sea[J].Natural Gas Geoscience,2010,21(1):7-17.[何家雄,吴文海,祝有海.南海北部边缘盆地油气成因及运聚规律与勘探方向[J].天然气地球科学,2010,21(1):7-17.]
[14]Gan Jun,Zhang Yingchao,Deng Yong,et al.Main controls overPalaeogene natural gas accumulation and its exploration directionin Wenchang Asag,the western Pearl River mouth basin[J].Chi-na Offshore Oil and Gas,2009,21(6):367-371.[甘军,张迎朝,邓勇,等.珠江口盆地西部文昌A洼陷古近系天然气富集主控因素与勘探方向[J].中国海上油气,2009,21(6):367-371.]
[15]Vail P R,Posamentier HW.Sequence Stratigraphy:SequencesandSystems Tract Development[C]//James D P,Leckie D A.Se-quences,Stratigraphy,Sedimentology:Surface and Subsurface.Ca-nadian Society of Petroleum Geologists 15 Alberta:Canadian Saci-ety of Petroleum Geologists,1988:582-583.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心