Application of 3D fine seismic interpretation technique in Dawangzhuang Area, Bohai Bay Basin, Northeast China

摘要

One of the major problems in subsurface seismic acquisition, procession, and exploration we are facing today is the uncertainty in geologic interpretation because of the complexity of subsurface geology and the limited dimension of the subsurface data available (including drilling data, well logging, and core samples). Case studies from worldwide exploration projects indicate that an integrated, three-dimensional seismic volume visualization and interpretation workflow contributes greatly to resolving the problems we mentioned by extracting critical geologic information from within 3D seismic datasets. Over the last decade, with the increasing employment and improvement of geophysical technology and following 3D seismic data acquisition and processing, the subsurface seismic interpretation workflow is composed geological data in the study area. Finally, we finished the fine interpretation of 3D seismic data and achieved a series of success and good application results. The evolution of tectonics resulted in sub-tectonic units containing the sequences of Ek, Es, Ed, Ng, and Nm. Interpretation reveals that tectonic transition zone which controlled the evolution of the sequences because of its strength, and also, the structural pattern resulted in types of fault (such as "Y" type). The seismic interpretations provide new information on subsurface geology, including the recognition of complex structural patterns in rift lacustrine basin and the presence of a tectonic transition zone at the structural center. The interpretation of these seismic reflection profiles provides new insights into the structure, geological evolution, and petroleum potential of the study area.