张莉, 雷振宇, 许红, 骆帅兵, 钱星, 帅庆伟, 季兆鹏, 周佳维. 南海北部深水区双峰盆地地震层序特征及勘探前景[J]. 海洋地质与第四纪地质, 2020, 40(1): 1-11. DOI: 10.16562/j.cnki.0256-1492.2018091401
引用本文: 张莉, 雷振宇, 许红, 骆帅兵, 钱星, 帅庆伟, 季兆鹏, 周佳维. 南海北部深水区双峰盆地地震层序特征及勘探前景[J]. 海洋地质与第四纪地质, 2020, 40(1): 1-11. DOI: 10.16562/j.cnki.0256-1492.2018091401
ZHANG Li, LEI Zhenyu, XU Hong, LUO Shuaibing, QIAN Xing, SHUAI Qingwei, JI Zhaopeng, ZHOU Jiawei. Depositional pattern and exploration prospect of the deepwater sediments in Shuangfeng basin[J]. Marine Geology & Quaternary Geology, 2020, 40(1): 1-11. DOI: 10.16562/j.cnki.0256-1492.2018091401
Citation: ZHANG Li, LEI Zhenyu, XU Hong, LUO Shuaibing, QIAN Xing, SHUAI Qingwei, JI Zhaopeng, ZHOU Jiawei. Depositional pattern and exploration prospect of the deepwater sediments in Shuangfeng basin[J]. Marine Geology & Quaternary Geology, 2020, 40(1): 1-11. DOI: 10.16562/j.cnki.0256-1492.2018091401

南海北部深水区双峰盆地地震层序特征及勘探前景

Depositional pattern and exploration prospect of the deepwater sediments in Shuangfeng basin

  • 摘要: 南海是中国海洋地质调查、油气和天然气水合物勘探的重点区域,随着南海浅水区勘探程度不断提高,南海北部深水区逐渐成为研究热点。然而,南海北部深水区双峰盆地研究程度仍然较低,以该区2D多道地震及围区钻井资料为基础,使用地球物理地震勘探理论和类比分析的方法研究了盆地地层沉积结构样式和油气勘探前景。在双峰盆地追踪了7个主要反射面,以不整合面为界划分了3套地震层序。研究认为盆地新生界地层厚度较大,中—晚中新世后,盆地进入半深海-深海相沉积环境,发育了以下切水道、深水扇及滑塌体为代表的深水沉积。盆地西部和北部坳陷渐新统湖相-海湾相泥岩,现今已达到成熟-早成熟阶段,具有一定的生烃能力。周缘发育冲积扇和扇三角洲沉积,盆内发育斜坡扇和盆底扇,可为良好储层。早中新世以来发育的半深海相泥岩,可为良好的区域盖层,具有较好的生储盖组合,预测该区具有良好的油气勘探前景。

     

    Abstract: The South China Sea is an important region offshore China for exploration of oil and gas resources and gas hydrate. As the exploration in the shallow waters is moving into a mature stage, the deep water area in the northern part of the South China Sea has gradually become a research hotspot. The study of the Shuangfeng Basin in the deep water basins of the northern South China Sea is obviously lagged behind the others. In this paper, seismic geophysical exploration theories and analogy methods are applied to study the tectono-sedimentary pattern and oil and gas exploration prospects of the basin, based on the 2D multi-channel seismic data and the drilling data of the basin and surrounding areas. A large amount of seismic data were processed and analyzed, and seven reflection horizons traceable recognized in the Shuangfeng basin. Three sets of the seismic sequence are established according to unconformable boundaries. Data shows that after mid-Late Miocene, the basin entered into a bathyal-pelagic depositional environment dominated by deep water sediments, such as undercut channel-fillings, deep water fans and slump deposits. The Cenozoic in the basin is quite thick. Analogy analysis of drilling data and basin modeling suggest that the Oligocene lacustrine-gulf facies in the western and northern depressions have reached the maturity or early maturity stage and had certain hydrocarbon generation capacity. The alluvial fan and fan deltaic deposits developed around the periphery, and the slope fan and the pelvic fan developed in the basin center could be good reservoirs. The bathyal mudstone deposited since Early Miocene are good in quality as regional cap rocks. Excellent source-reservoir-cap systems are available for oil and gas accumulation.

     

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