Research On The Drawing Method Of The Sedimentary Facies Belt Maps Of The River Delta Deposits

The sedimentary facies maps, in terms of the plane, reflect the current area existing the sedimentation law, which describe series of sedimentary facies spatial distribution of the specific stratigraphic unit of the given area, it has great significance to research the remaining oil distribution and the flow laws of underground fluid.In this thesis, study with the river delta sedimentary model of Daqing Oilfield as the background, sedimentary facies categories as data base, focuses on how to use the human experience into automatic drawing of sedimentary facies belt maps. Combined artificial experience with the constraint rules of river delta sedimentary to achieve map drawing of river delta sedimentary facies on the basis of improved constraint triangulation method. At first, organized wells through the adaptive data block and grid index, using the uniformly interpolated way to avoid the complex problems of local circumstances which caused by insertion data points centralized. Proposed an improved Waston-Bowyer triangulation algorithm, which can effectively reduce the time complexity on build convex hull and position the triangle where point insertion in, and then improved the speed of building triangulation; Secondly, by analyzing the characteristics of the river delta deposit, proposed constraint triangulation construction method of river delta deposit constraint, combined the river forecasting methods with combinations rules of sedimentary facies categories to determine the constraint side, build connectivity relationship between the wells by the way of side exchanging and the virtual wells insertion, and then complete the construction of constrained triangulation; Finally, improving mapping results through combined with data preprocessing, smooth, filling color and other steps on the basis of these two points, and uses actual data from different oil group wells for testing, further validate the usefulness of the algorithm.Applying the above research result to the practical application of oil field, the practical application effect shows that the sedimentary facies maps drawing method studied in this paper has faster speed, simple operation, and ensuring the high quality of drawing while improving the efficiency of drawing at the same time.