构造因素对断陷湖盆陆相层序影响机理的计算机模拟

综合考虑陆源碎屑物供给、内源碳酸盐沉积、沉积物侵蚀与再沉积、重力沉沉积以及构造升降和水平位移等诸多地质因素,建立了一个能够模拟各型盆地层序地层的综合数学物理方程式.采用自行研制的定量层序地层模拟系统,以断陷湖盆陡坡带(泌阳断陷双河一赵凹地区)为例,在假定出平面变化呈一正弦函数曲线,物源供给速率中等、匀速的条件下,分别模拟了盆地加速沉降和减速沉降两种过程的陆相层序响应特征.研究结果表明,一个构造沉降旋回过程控制着一个陆相层序及其体系域的发育和形成.

COMPUTER SIMULATION ON INFUENCING MECHANISM OF STRUCTRUEAL FOCTORS ON TERRIGENOUS SEQUENCE IN FAULT-DEPRESSED LACUSTRINE BASIN

Synthetically considering plenty of geological factors such as recharge of landsource fragmental material , sedimentation of chemically formed cabonatite, sediment erosion and resedimentation, gravity flow, structural adjustment,horizontal displacement and so on,a math-physical equation which is comprehensive to simulate every type of basin was set up. Using the simulation system of quantitative sequence stratigraphy designed by authors,and taking the steep slope zone of fault-depressed lacustrine basin(e. g. shuanghe-Zhaoao area of Biyang fault-depression) as an example, the responsed characteristics of terrigenous sequence to the procedure of accelerated/decelerated structural subsidence has respectively been simulated based on the hypothetical condition that lacustrine level change presents a sinusoid curve,and recharge of land-source fragmental meterial is in midele and uniform velocity. The research result in this paper shows that a cycle of structure subsidence corresponds with the formation of a terrigenous sequence and its system tract.