论文部分内容阅读
莺歌海盆地与琼东南盆地是两种不同成因类型的盆地，前者是与红河大断裂有关的转换—伸展盆地，而后者则为伸展盆地。距今５Ｍａ时的又一次新的热事件后使两盆地统一为一个盆地，开始了共同的新的沉降活动。采用地球物理方法，据盆地拉张指数、古今热流值等指标研究了盆地的沉降、构造演化以及热体制。运用ＤＳＴ和ＲＦＴ测压、地震层速度和测井声波时差趋势多项式法换算压力数据，作出了超压剖面图及超压顶面等深图等，据此分析了盆地超压及高温环境形成机制。进而分别阐述了转换—伸展盆地演化与油气的关系，伸展盆地演化与油气的关系。
Yinggehai Basin and Qiongdongnan Basin are two different genetic types of basins. The former is a transformation-extension basin related to the Great Red River fault, while the latter is an extensional basin. After another new hot event at 5 Ma, the two basins unified into one basin and started a new common subsidence activity. Geophysical methods were used to study the basin subsidence, tectonic evolution and thermal regimes based on the basin extensional index, ancient and modern heat flux values and other indicators. The pressure data were calculated by the polynomial method of DST, RFT, seismic velocity and time-difference of logging acoustic wave, and the overpressure profile and overpressure contour map were made. Based on this, the formation mechanism of overpressure and high temperature environment in the basin was analyzed. Then the relationship between the conversion-extensional basin evolution and oil and gas evolution and the relationship between extensional basin evolution and oil and gas evolution are explained respectively.