PHYSICAL SIMULATION EXPERIMENT AND EXAMPLE FOR THE STRUCTURES FORMING BY INVASION OF IGNEOUS ROCK

In the instance of overlying strata being transverse homogeneous medium,the results of physical simulation experiment for the special structure formed by invasion of igneous rock indicate that the process of magma invasion spirals up snake-shapedly in the upper direction,and ascends oscillatingly in the profile.Top structural configuration is rounded or near round arch,and its boundaries are blocking faults.The process of magma invasion to brittle strata is alternative with stress accumulation and release,in which microseism leap and irregular channel of magma are shown.In the course of magma invasion to plastic strata,the stress varies smoothly and consecutively,the channels of magma obviously spread around,the diameter of the channels increasies,and the structural configuration of the top strata has the characteristics of inheritance.The result of simulation test can logically interpret the developing mechanism of SH24 structure in Jiyang Depression.Exploration results indicate that this kind of derived structures in the process of magma invasion is very benefit to reservoir formation.The results of this experiment fill up the blank of domestic physical simulation for the structure formed by invasion of igneous rock and have acquired the related experiment parameters,which provides experience and reference for the future analogous experiments.