琼东南盆地陵水凹陷渐新统陵水组沉积特征及烃源岩发育模式
|
摘要
琼东南盆地陵水凹陷深层渐新统陵水组烃源岩的沉积成因机制和发育分布规律,成为制约现阶段深水区油气勘探的关键问题。综合应用二维地震资料和钻井资料,将陵水组地层划分为3个三级层序。在层序地层格架内,共识别出丘状、楔状前积、斜交前积、席状、下切充填、波状等典型地震相类型。依据地震沉积学理论进行了沉积相解释,识别出滨岸平原、浅海、半深海、海底扇、扇三角洲等5种沉积相类型,并分层序分析了受分隔性古隆起影响的滨浅海沉积体系的平面展布特征。结合地球化学资料,建立了滨岸平原含煤系烃源岩和陆源海相烃源岩的沉积发育模式:腐殖型含煤系烃源岩主要分布于陵水凹陷东侧松南低凸起和南侧陵南低凸起边缘的滨岸平原相带内,有机质来源为陆生高等植物;陆源海相烃源岩主要发育于扇三角洲体系与浅海相、半深海相的过渡带,有机质来源为陆生高等植物与水生生物的混合。
It is very important to systemically study the sedimentary mechanism and distribution of source rock of the Oligocene Lingshui Formation in Lingshui Sag for the successive petroleum exploration in deep water area of Qiongdongnan Basin. Based on 2 D seismic data and drilling data, the Lingshui Formation is subdivided into three thirdorder sequences. Within the sequence stratigraphic framework, six types of seismic facies such as mound, wedge,oblique, sheet, filling, and wave are identified. According to the theory of seismic sedimentology, five types of sedimentary facies such as coastal plain, shallow sea, bathyal sea, submarine fan, and fan delta are identified. The sedimentary characteristic of each sequence is analyzed, especially of the coastal plain and shallow sea affected by the separated paleo-uplifts. By integrated analysis of geochemical data and sedimentary facies, the source rock development model of Lingshui Formation is setup in Lingshui Sag. The coal-bearing rocks mainly developed in the coastal plain along Lingnan low uplift and Songnan low uplift to the east of sag, with sufficient input of terrestrial organic matter.The marine source rocks with terrestrial input mainly developed in the shallow sea and bathyal facies along those fan delta systems, in which terrestrial organisms is predominant and aquatic organisms is minor.
It is very important to systemically study the sedimentary mechanism and distribution of source rock of the Oligocene Lingshui Formation in Lingshui Sag for the successive petroleum exploration in deep water area of Qiongdongnan Basin. Based on 2 D seismic data and drilling data, the Lingshui Formation is subdivided into three thirdorder sequences. Within the sequence stratigraphic framework, six types of seismic facies such as mound, wedge,oblique, sheet, filling, and wave are identified. According to the theory of seismic sedimentology, five types of sedimentary facies such as coastal plain, shallow sea, bathyal sea, submarine fan, and fan delta are identified. The sedimentary characteristic of each sequence is analyzed, especially of the coastal plain and shallow sea affected by the separated paleo-uplifts. By integrated analysis of geochemical data and sedimentary facies, the source rock development model of Lingshui Formation is setup in Lingshui Sag. The coal-bearing rocks mainly developed in the coastal plain along Lingnan low uplift and Songnan low uplift to the east of sag, with sufficient input of terrestrial organic matter.The marine source rocks with terrestrial input mainly developed in the shallow sea and bathyal facies along those fan delta systems, in which terrestrial organisms is predominant and aquatic organisms is minor.
引文
[1]李友川,邓运华,张功成.中国近海海域烃源岩和油气的分带性[J].中国海上油气,2012,24(1):6-12.
[2]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.
[3]王振峰,甘华军,王华,等.琼东南盆地深水区古近系层序地层特征及烃源岩分布预测[J].中国海上油气,2014,26(1):9-16.
[4]蔡佳.琼东南盆地古近系古地貌恢复及其对层序样式和沉积特征的控制[D].中国地质大学,2009.
[5]宋广增,王华,孙志鹏,等.琼东南盆地深水区陵水凹陷古近纪同沉积断裂对层序构成样式的控制[J].中国石油大学学报(自然科学版),2014,38(4):9-18.
[6]张亚雄,朱筱敏,张功成,等.琼东南盆地古近系陵水组层序地层特征[J].油气地质与采收率,2013,20(5):33-37.
[7]陈欢庆,朱筱敏,张功成,等.井震结合深水区物源分析:以琼东南盆地深水区古近系陵水组为例[J].石油地球物理勘探,2010,45(4):552-558.
[8]王东东.琼东南盆地古近系高分辨率层序地层研究[D].山东科技大学,2009.
[9]陈宇航,刘震,姚根顺,等.一个深水区深层沉积相早期预测方法:以南海北部深水区D凹陷渐新统为例[J].天然气地球科学,2015,26(11):2122-2130.
[10]王子嵩,刘震,孙志鹏,等.琼东南深水区乐东—陵水凹陷渐新统烃源岩早期预测及评价[J].中南大学学报(自然科学版),2014,45(3):876-888.
[11]黄保家,王振峰,梁刚.琼东南盆地深水区中央峡谷天然气来源及运聚模式[J].中国海上油气,2014,26(5):8-14.
[12]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.
[13]杨金海,李才,李涛,等.琼东南盆地深水区中央峡谷天然气成藏条件与成藏模式[J].地质学报,2014,88(11):2141-2149.
[14]黄保家,李绪深,王振峰,等.琼东南盆地深水区烃源岩地球化学特征与天然气潜力[J].中国海上油气,2012,24(4):1-7.
[15]李文浩,张枝焕,李友川,等.琼东南盆地古近系渐新统烃源岩地球化学特征及生烃潜力分析[J].天然气地球科学,2011,22(4):700-708.
[16]谢玉洪,童传新,范彩伟,等.琼东南盆地断裂系统特征与演化[J].大地构造与成矿学,2015,39(5):795-807.
[17]王振峰,孙志鹏,朱继田,等.南海西部深水区天然气地质与大气田重大发现[J].天然气工业,2015,35(10):11-20.
[18]雷超.南海北部莺歌海—琼东南盆地新生代构造变形格局及其演化过程分析[D].中国地质大学,2012.
[19]HU B, WANG L, YAN W, et al. The tectonic evolution of the Qiongdongnan Basin in the northern margin of the South China Sea[J]. Journal of Asian earth sciences, 2013, 77:163-182.
[20]李绪宣.琼东南盆地构造动力学演化及油气成藏研究[D].中国科学院研究生院(广州地球化学研究所),2004.
[21]VAIL P R. Seismic stratigraphy interpretation using sequence stratigraphy(part 1):seismic stratigraphy interpretation procedure[M]//BALLY A W. Atlas of seismic stratigraphy. AAPG studies in geology#27, 1987:1-10.
[22]黄第藩,李晋超.有关生油岩定量评价问题的讨论:与李汶国同志商榷[J].石油与天然气地质,1982,3(2):142-148.
[23]张金亮,谢俊.储层沉积学[M].北京:石油工业出版社,2007.
[2]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.
[3]王振峰,甘华军,王华,等.琼东南盆地深水区古近系层序地层特征及烃源岩分布预测[J].中国海上油气,2014,26(1):9-16.
[4]蔡佳.琼东南盆地古近系古地貌恢复及其对层序样式和沉积特征的控制[D].中国地质大学,2009.
[5]宋广增,王华,孙志鹏,等.琼东南盆地深水区陵水凹陷古近纪同沉积断裂对层序构成样式的控制[J].中国石油大学学报(自然科学版),2014,38(4):9-18.
[6]张亚雄,朱筱敏,张功成,等.琼东南盆地古近系陵水组层序地层特征[J].油气地质与采收率,2013,20(5):33-37.
[7]陈欢庆,朱筱敏,张功成,等.井震结合深水区物源分析:以琼东南盆地深水区古近系陵水组为例[J].石油地球物理勘探,2010,45(4):552-558.
[8]王东东.琼东南盆地古近系高分辨率层序地层研究[D].山东科技大学,2009.
[9]陈宇航,刘震,姚根顺,等.一个深水区深层沉积相早期预测方法:以南海北部深水区D凹陷渐新统为例[J].天然气地球科学,2015,26(11):2122-2130.
[10]王子嵩,刘震,孙志鹏,等.琼东南深水区乐东—陵水凹陷渐新统烃源岩早期预测及评价[J].中南大学学报(自然科学版),2014,45(3):876-888.
[11]黄保家,王振峰,梁刚.琼东南盆地深水区中央峡谷天然气来源及运聚模式[J].中国海上油气,2014,26(5):8-14.
[12]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.
[13]杨金海,李才,李涛,等.琼东南盆地深水区中央峡谷天然气成藏条件与成藏模式[J].地质学报,2014,88(11):2141-2149.
[14]黄保家,李绪深,王振峰,等.琼东南盆地深水区烃源岩地球化学特征与天然气潜力[J].中国海上油气,2012,24(4):1-7.
[15]李文浩,张枝焕,李友川,等.琼东南盆地古近系渐新统烃源岩地球化学特征及生烃潜力分析[J].天然气地球科学,2011,22(4):700-708.
[16]谢玉洪,童传新,范彩伟,等.琼东南盆地断裂系统特征与演化[J].大地构造与成矿学,2015,39(5):795-807.
[17]王振峰,孙志鹏,朱继田,等.南海西部深水区天然气地质与大气田重大发现[J].天然气工业,2015,35(10):11-20.
[18]雷超.南海北部莺歌海—琼东南盆地新生代构造变形格局及其演化过程分析[D].中国地质大学,2012.
[19]HU B, WANG L, YAN W, et al. The tectonic evolution of the Qiongdongnan Basin in the northern margin of the South China Sea[J]. Journal of Asian earth sciences, 2013, 77:163-182.
[20]李绪宣.琼东南盆地构造动力学演化及油气成藏研究[D].中国科学院研究生院(广州地球化学研究所),2004.
[21]VAIL P R. Seismic stratigraphy interpretation using sequence stratigraphy(part 1):seismic stratigraphy interpretation procedure[M]//BALLY A W. Atlas of seismic stratigraphy. AAPG studies in geology#27, 1987:1-10.
[22]黄第藩,李晋超.有关生油岩定量评价问题的讨论:与李汶国同志商榷[J].石油与天然气地质,1982,3(2):142-148.
[23]张金亮,谢俊.储层沉积学[M].北京:石油工业出版社,2007.