河流相地层高精度地层构型界面形成机制及识别方法

分析了河流相单砂层级别的高精度地层构型界面的形成机制及河流相自旋回对异旋回的改造和影响,总结了单砂层级别高精度地层构型界的识别标志,及在异旋回控制下进行自旋回对比高精度地层构型界面的对比方法。结果表明:一个单层主要由河道侵蚀前期沉积物掠夺可容空间并逐渐充填、洪水期形成洪泛泥岩后形成;共有5种河道砂体的叠置模式和对比模式,而且河道砂体的叠置模式受可容空间增加速率与沉积物供应速率比值控制。

Formation mechanism and recognizing method of high resolution strata architecture boundary in fluvial strata

The formation mechanism and recognizing method of high resolution strata architecture boundary of single sand bed in fluvial strata were analyzed.The results show that the fluvial channel incises former sediments and gets accommodation first,and then the accommodation is filled,and after the flood mud is deposited,a single bed is formed.On the basis of the analysis,5 types of superimposed style and correlation modes of channel sand body are summarized,and it is considered that the superimposed style of channel sand body is controlled by A/S.On the basis of the analysis of reforming and effects of auto cycle on different cycles in fluvial strata.The recognizing mark of high resolution strata architecture boundary of single sand body scale and the correlation method in fluvial strata were summarized,in which auto cycle was correlated under the control of different cycles.