2D Seismic Reflection Modeling Study About Tengchong Volcanic Structures

Tengchong volcanic zone is famous, there distributes a large number of Quaternary volcanoes. In the study of volcanic structures and other complex structures Seismic method has advantages in terms of higher resolution. For the seismic theory is based on horizontal layered model, the application on the volcanic structures and other complex structures has some limitations. In volcanic areas, shallow shield is usually accompanied by high-speed layers, complex shooting and receiving conditions on the surface. It is difficult to obtain high-quality seismic reflection data on these areas using the conventional 2D seismic method.For the difficulty on the seismic data acquisition, processing, interpretation, we use forward modeling method base on FDM to carry out forward simulation in order to study the seismic wave field characteristics of volcanic area. We established different geophysical models by the collected geological, electrical, natural seismic tomography, drilling and other information. We show a method to improve the result about seismic data acquisition, processing and interpretation at Tengchong volcano area.We give thick high-speed layer model, low-speed high-speed inter-layer model, bending model by the summary and analysis about geological, geophysical and drilling data in this area. By Forward modeling we point out that we should have more work on the observing system design in order to get high signal to noise ratio data and processing data of different offset to get information of the under layer and comparing the difference between the section and the model to ensure the accuracy of interpretation. Assisted by forward modeling, we get 2D seismic data of Tengchong for the first time. We show a new method about studying complex structures by seismic.