Method of quantitative characterization with different river patterns of geometric parameters of channel sand bodies and its application

Key words:  river patterns  channel sand body  geometric parameter  quantitative characterization  development trends  seismic prediction

Abstract:

In order to quantitatively characterize the relationship between geometric parameters of river belt and sand bodies of different river types,166 sets of geometric parameters of braided river, anabranched river and meandering river patterns were measured with Google Earth software,then six quantitative relations between the widths of various river patterns (belts) and three quantitative relations between the widths and lengths of river sand bodies(braided river island, anabranched river channel sand bar, meander river point bar, respectively) were established. The quantitative characterization of three-dimensional geometric parameters of single and/or composite channel (belt) and sand body of each river pattern is realized by combiningthe following:empirical formula of predecessors, statistical results of different degrees of connected sand bodies of the Neogene in shallow sea area of Shengli Oilfield, seismic inversion of sand body, and predictions of connected sand body scale in development block all had the desired effect.The result shows that this method can not only distinguishriver types and reflect characters between sedimentary characteristics of river sand bodies in different river types, but also accurately describe the scale of different river belts and the connected scale of sand bodies. The method is proven helpful to forecast the distribution of sand bodies and the scope of oil and gas reserves.