The Fine Characterization And Geologicalmodeling Of Scattered Sand Bodies

Putaohua reservoir in the Gu1 of Songliao basin has much complicated problems, among them are the followings: the classification of stratigraphy is rough, the source direction is not clear, the distribution of sand body is undefined, the sand body is narrow and changeable, and the distribution of oil-water is extremely complex. To solve these problems, this paper embarks from the high-resolution isochronous stratigraphic framework, then finely depicts every sedimentary units, and restore the process of the ancient sedimentary. Moreover, this paper deeply analysis reservoir genetic types and depositional types and summarize reservoir characteristics and laws. For further characterizing the internal heterogeneity of reservoir, we use porosity, permeability and other parameters to descirbe the reservoir. Finally, we adopt the front technology to establish the 3D geological models of the Gu1 and lay a solid foundation for the next explorartion and development.Using high-resolution isochronous stratigraphic framework and other advanced technology, we finely descripted the single well facies of coring well data, and counted the sedimentary period of the 200 Wells in development area, then subdivid the original 11 layers into 15 depositional time unit. This paper identified six district contrast marker layers, and controlled the well region by using the combination of flooding surface, ensured the consistency of regional correlation dependent on the close skeleton, then finished the difficult isochronous contrast under the condition of 537.5 km2 large area large hole spacing.This paper,on the basis of high-resolution isochronous stratigraphic framework, comprehended heavy minerals combination, percentage of each heavy minerals, sand ratio, sand thick, the anatomy of close well spacings and other methods, and determined the sediment coming from the northwest. We finely dissect the plane geometry and the superimposed relationship of sand body of the reservoir in the parallel and vertical direction of the sediment source. This paper identifies three kinds of genetic sand respectively controled by "river", "wave", and the above two geological forces. We established 3 microfacies and 9 energy logging facies model, and orderly combined the sedimentary microfacies of 15 depositional time units. Therefore, we restored the sedimentary process of the complex reservoir, and realized the sedimentary evolution sequence under the rapid changed energy. Based on the macro understanding of the reservoir, we further characterized the internal heterogeneity of reservoir by using porosity, permeability and other parameters. Using 3D geological modeling technology, we make the reservoir characteristics three-dimensional visualization.