东海陆架盆地南部与毗邻陆域中生代耦合过程研究

Basin- mountain coupling is a key issue of dynamics of basin formation and evolution. It is one of the difficulties and the leading edge scientific problems of basin's study to quantitatively, semi-quantitatively recover prototype basin and the evolution history of continental margin, explain geological processes of basin-range conversion and reconstruct the early prototype basin through the basin-mountain coupling process studies.The East China Sea Sheft Basin is a composite petroliferous basin, which was superimposed by various original basins in different geological time. Its tectonic location decides the complicated tectonic evolution history. The main study area of this project is the southern East China Sea Sheft Basin. Using of basin-mountain coupling research ideas,We will reveal the response on forming process of Zhejiang-Fujian uplift from the sequence and structure of the East China Sea Shelf Basin, and explore the character and type of the East China Sea Shelf Basin from evolution of the Zhejiang-fujian uplift with tectonic evolution as the main idea.And we will construct the regional structural cross-section of of the East China Sea Sheft Basin and Zhejiang - Fujian uplift ,and establish geometry and kinematics model of the coupling process of the southern East China Sea Basin and Zhejiang-Fujian uplift, and reveal the basin's properties and the kinetics of the formation process in Mesozoic based on analysis of framework of structure and stratigraphic, depositional environment, tectonic deformation,activity period and tectonic evolution together with structural simulation , sea-land contrast, joint inversion of gravity, magnetic and seismic in the Mesozoic basin , and combining with the study on tectonic activity periods, regional framework and kinematic process in Zhejiang-Fujian uplift. The research will provide a theoretical basis for petroleum exploration in the southern East China Sea continental shelf basin, and create the conditions for strategic exploration reserve base to find petroleum in the East China Sea Basin.

盆山耦合是盆地形演化动力学研究的关键问题，通过对盆山耦合过程研究，定量、半定量地恢复盆地原型及大陆边缘的演化历史，解释盆山转换的地质过程，是盆地研究的难点和前缘科学问题。本项目将以东海陆架盆地南部为主要研究对象，运用盆山耦合研究思路，以构造演化为主线，拟从东海陆架盆地南部层序结构揭示浙闽隆起形成过程响应，从浙闽隆起形成中探索东海陆架盆地性质。通过中生代盆地结构、地层格架、沉积环境、构造变形、构造活动期次、构造演化等的研究和构造模拟、海-陆对比、重磁震反演，将其与浙闽隆起构造期次、区域格架分析与运动学过程研究相结合，构建东海陆架盆地与浙闽隆起区域结构剖面，建立东海陆架盆地南部-浙闽隆起耦合过程的几何学与运动学模型，揭示中生代盆地性质与形成过程的动力学机制。为东海海域油气勘探提供理论依据，为我国在东海陆架盆地寻找油气战略勘探后备基地创造条件。

如何定量表达、恢复和解释盆山演变的构造运动学过程，始终是地球系统科学研究的难点和前缘科学问题。本项目根据盆－山耦合思路，在深入研究东海陆架盆地中生代盆地结构、沉积充填基础上，运用构造解析、构造物理模拟、海陆对比、重磁反演等技术，结合浙闽隆起乃至华南地块构造演化背景，重塑了中生代以来东海陆架盆地演化过程及其形成动力学机制，明确了中生代盆地类型。主要成果如下：.（1）形成了针对东海陆架深层二维地震一套关键处理技术体系—高精度速度建模技术，中生界地震成像品质获得改善，为东海陆架深层研究奠定了资料基础；（2）利用重磁震综合物理反演技术分析了磁性基底深度和深部结构特征，推测出东海陆架盆地与邻域深部结构具有“NE”分带特征，东海陆架是大陆地壳向海域的延伸，为东海划界提供基础；（3）建立了东海陆架盆地南部与毗邻福建、浙江南部与广东东部陆域中生代地层序列，指出东海及邻域中生界厚度大、分布广，具有较好的成油气沉积环境；（4）中生代盆地具有“NE”分带地质结构特征；断裂活动表现为北强南弱；岩浆活动主要发育在燕山晚期和喜山中期和晚期，具有南弱北强，西老东新之趋势，中生代盆地发育有三类构造变形样式和11种构造组合；（5）提出东海陆架具有多期次叠加盆地演化性质，海西期－印支中晚期华南主要为克拉通盆地，晚三叠－中侏罗世，东海陆架盆地古太平洋活动大陆边缘拗陷发展阶段，早白垩世晚期—晚白垩世伸展断陷型盆地及古近纪弧后伸展断陷型盆地。.依托本项目，联合培养了研究生3名，撰写了19篇科技论文，其中SCI论文2篇，与2个国内单位建立了有效的合作关系，并且获取了有显示度的专业领域和科学普及成果，取得了良好的社会效益。