Seismic inversion is an important technologies of applied geophysics (Russell B. 1988). Well-constrained inversion is one of the commonly used inversion technology. It allows us to achieve satisfactory results that best assembling the wells and meanwhile revealing the lateral and vertical characters of the reservoir. Like other inversion technology, despite the algorithm study which is currently very much matured, the key issue of applications is how to build up an objective initial model (Solarski T., 2010, Niepsuj, 2012).
Conventionally, people start the exploration of the reservoirs by structure study, and then move to the study of reservoir rocks. So for the most commonly used reservoir rock study technology, seismic inversion, the initial models are usually built up based on structure frame. But in fact, the distribution of reservoir rock is controlled by sedimentology, the object of sequence stratigraphy study. So the question is: Will the structure framework work as good as the sequence stratigraphy framework in well-constrained inversion? However, few works have been done.
The purpose of the paper is to investigate the differences of well-constrained inversions based on structure framework and the sequence stratigraphy framework. Two cases studies will be presented in the paper. One is of classic reservoir, and one is of carbonate reservoir. In the case study of the Jurassic formation, based on the sequence stratigraphy framework, velocity field study, seismic inversion has been greatly improved. In the case of grainbeach carbonate reservoir in Cambrian strata, sequence stratigraphy framework instead of the structure framework improved the understanding of the distribution of the reservoir, and helped to differentiate reservoir deposited in different times, which broke through the bottleneck problem of finding the high production zones.
Well-constrained inversion plays a very important role in seismic reservoir prediction. And how to improve the prediction has attracted heavy attention from geophysicists. Seismic technology research and algorithm study work are very direct ways for geophysicists. But except the pure geophysical work, integrating of geological theory of how the reservoirs are formed, like the sequence stratigraphy, can greatly improve the seismic prediction.