Prediction of high-quality tight sandy conglomerate reservoirs in Mesozoic of Xinglongtai buried hill, Liaohe Depression by seismic facies-controlled inversion
Abstract：The tight sandy conglomerate reservoir in the Mesozoic of the Xinglongtai tectonic belt in the Liaohe Depression is markedly controlled by the dominant lithologies. Nevertheless, the complex lithologies, large thickness variation, high reservoir heterogeneity, and difficult reservoir prediction severely restrict the exploration and discovery in the study area. For this reason, a method of predicting high-quality tight sandy conglomerate reservoirs based on seismic facies-controlled inversion is proposed. Specifically, the seismic reflection characteristics and geological implications of the sequence in the Mesozoic are clarified by fine horizon calibration through well-to-seismic integration. On this basis, a geological model reflecting sedimentary facies belts and lithologic variations is built with logging data. Seismic forward modeling is carried out to analyze the seismic response characteristics of the combination of different types of lithologies, select seismic attributes sensitive to the thickness of the sandy conglomerate, and compile a sedimentary facies map. Then, with porosity and permeability data, the sequence of the dominant lithologies in the Mesozoic is defined before the logging identification criteria are developed and the lithology-sensitive logging parameters are selected. Finally, post-stack inversion for sensitive parameter reconstruction is performed under the constraints of the plane facies belt and the stratigraphic sequence to characterize the distribution pattern of the dominant lithologies. The results show that the lithology prediction for the 10 validation wells reaches an accuracy of 79.8% and is in good agreement with the geological understanding. This paper provides strong support for well placement and reserve upgrading in the tectonic belt.
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