油气勘探与开发实践表明, 在少井、无井及低分辨率地震资料的海域, 利用地震沉积学的方法和技术, 可有效建立高频层序地层格架, 刻画沉积体系演化规律, 这是陆相断陷湖盆地层—岩性油气藏勘探的有效手段。本研究以番禺4洼古近系文昌组为例, 在地震沉积学理论指导下, 基于高分辨率处理地震资料, 在三级层序地层格架约束下, 以体系域旋回为单位, 结合单井的岩性资料, 利用90°相位转换、地层切片及定量岩石物理分析技术, 对珠江口盆地番禺4洼始新统文昌组开展了地震沉积学研究, 划分了6个三级层序, 建立了地层岩性与地震极性关系, 并对已钻井开展岩石物理分析, 最终在SQ2筛选不同时期切片, 雕刻了文二段沉积时期, 东、西两侧向湖盆推进的扇三角洲、近岸水下扇及辫状河三角洲的沉积体系展布和演化规律。
江宁
,
全志臻
,
彭光荣
,
张青林
,
雷永昌
,
徐颖晶
,
程卫华
. 基于地震沉积学方法的沉积相研究——以珠江口盆地番禺4洼古近系为例[J]. 热带海洋学报, 2016
, 35(4)
: 102
-111
.
DOI: 10.11978/2015123
Through practices of litho-stratigraphic hydrocarbon exploration and development, the theory and technical method of seismic sedimentology can be effectively applied to build high-frequency stratigraphic frame and study the variation of depositional system in terrestrial rifted lake basin. Here, we present our study on the Wenchang formation of Paleogene strata of PY4 Sag using seismic sedimentology theory. Based on high-resolution processed seismic data and third-order sequence frame, system tract cycle is defined as a study unit. Combined with lithological data of drilled wells, six third-order sequences can be recognized, and the relationship between seismic polar and lithological attribute can be established by 90° phase-rotation, seismic slice and quantitative rock-physical technical. Key slices are chosen in SQ2 to reveal the depositional system variation of fan delta, nearshore subaqueous fan and braided river delta that prograde basinward from west and east of PY4 Sag.
[1] 陈长民, 施和生, 许仕策, 等, 2003. 珠江口盆地(东部)第三系油气藏形成条件[M]. 北京: 科学出版社, 5-30.
[2] 刘从印, 周平兵, 曾驿, 等, 2009. 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, 21(2): 92-94. LIU CONGYIN, ZHOU PINGBING, ZENG YI, et al, 2009. An analysis of the main controls on Neogene hydrocarbon accumulation in Panyu 4 sag[J]. China Offshore Oil and Gas, 21(2): 92-94 (in Chinese with English abstract).
[3] 曾洪流, 2011. 地震沉积学在中国: 回顾和展望[J]. 沉积学报, 29(3): 417-426. ZENG HONGLIU, 2011. Seismic sedimentology in China: A review[J]. Acta Sedimentologica Sinica, 29(3): 417-426 (in Chinese with English abstract).
[4] 曾洪流, 朱筱敏, 朱如凯, 等, 2012. 陆相坳陷型盆地地震沉积学研究规范[J]. 石油勘探与开发, 39(3): 275-284. ZENG HONGLIU, ZHU XIAOMIN, ZHU RUKAI, et al, 2012. Guidelines for seismic sedimentologic study in non-marine postrift basins[J]. Petroleum Exploration and Development, 39(3): 275-284 (in Chinese with English abstract).
[5] 朱筱敏, 2006. 层序地层学[M]. 东营: 中国石油大学出版社, 108-147.
[6] ZENG HONGLIU, BACKUS M M, BARROW K T, et al, 1998a. Stratal slicing, Part I: Realistic 3-D seismic model[J]. Geophysics, 63(2): 502-513.
[7] ZENG HONGLIU, HENRY S C, RIOLA J P, 1998b. Stratal slicing, Part II: Real 3-D seismic data[J]. Geophysics, 63(2): 514-522.
