杜学斌, 陆永潮, 裴建祥, 张道军, 段亮, 李祥权, 张亚震, 杨盼. 南海南部礼乐盆地上渐新统—下中新统生物礁生长模式及分布规律[J]. 海洋地质与第四纪地质, 2018, 38(6): 98-107. DOI: 10.16562/j.cnki.0256-1492.2018.06.010
引用本文: 杜学斌, 陆永潮, 裴建祥, 张道军, 段亮, 李祥权, 张亚震, 杨盼. 南海南部礼乐盆地上渐新统—下中新统生物礁生长模式及分布规律[J]. 海洋地质与第四纪地质, 2018, 38(6): 98-107. DOI: 10.16562/j.cnki.0256-1492.2018.06.010
DU Xuebin, LU Yongchao, PEI Jianxiang, ZHANG Daojun, DUAN Liang, LI Xiangquan, ZHANG Yazhen, YANG Pan. A development model for Late Oligocene to Early Miocene reefs in the Liyue Basin of South China Sea[J]. Marine Geology & Quaternary Geology, 2018, 38(6): 98-107. DOI: 10.16562/j.cnki.0256-1492.2018.06.010
Citation: DU Xuebin, LU Yongchao, PEI Jianxiang, ZHANG Daojun, DUAN Liang, LI Xiangquan, ZHANG Yazhen, YANG Pan. A development model for Late Oligocene to Early Miocene reefs in the Liyue Basin of South China Sea[J]. Marine Geology & Quaternary Geology, 2018, 38(6): 98-107. DOI: 10.16562/j.cnki.0256-1492.2018.06.010

南海南部礼乐盆地上渐新统—下中新统生物礁生长模式及分布规律

A development model for Late Oligocene to Early Miocene reefs in the Liyue Basin of South China Sea

  • 摘要: 生物礁具有良好的油气聚集能力,故一直是石油地质学家关注的焦点。礼乐盆地具有优良的成礁条件,但受限于资料品质,生物礁的研究仅仅处在起步阶段。本文借助重新处理的2D地震数据,利用地质-地球物理精细刻画技术,对礼乐盆地T70—T50时期生物礁进行了精细解剖。研究认为,T70—T60时期是礁体初始发育阶段,T60—T50时期是礁体主发育阶段。盆内可以识别出断棱型和断垒型两种礁体结构模型,其中断棱型又细分为多棱型和单棱型。断棱型是研究区的主要礁体构型。礁体的空间生长表现为侧向退积和垂向加积耦合过程。礁体结构可以细分为6期生长单元,前三期是加积慢退型生长,后三期为快退型生长。礁体的空间展布形态与生长速度受海平面升降、可容纳空间变化和古地貌形态联合控制。

     

    Abstract: As a good reservoir for hydrocarbon accumulation, reefs have become a major concern of petroleum geologists for many years.The Liyue Basin in South China Sea is an excellent place for reef development. However, since lack of data, especially high quality seismic data, the research of Liyue Basin still remains in an initial stage up to date. This time, based on the re-processed 2D seismic data, using the up to date geological-geophysical analysis techniques, we studied the reef deposits during the period of T70-T50 in the Liyue Basin. It is found that reefs started growing in the time of T70-T60 and entered a booming stage in the period of T60-T50. Both hummocky shaped and lenticular reefs are discovered.The hummocky shaped reefs, which dominate the research area, can be further divided into single and multiple according to the number of hummocky structures. The growth of hummocky reefs is a combination of lateral retrogression and vertical accretion. From the view point of internal structure, the reef can be subdivided into 6 growth units, the first 3 stages shows a slow retrogression and the last 3 stages are the stages of rapid growth. The growth rate of the reefs is jointly controlled by sea level fluctuation, accommodation space and paleogeography.

     

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