Recognition marks and correlation principles of single sand bodies in distributary channel of shallow delta plain

摘要

Distributary channel is the main type of sand bodies in shallow delta plain. Based on logging geology, sedimentology, sequence stratigraphy and development geology, we systematically analyzed single sand body in the compound distributary channel of shallow delta. Shallow delta plain has well-developed large interconnected and banded compound distributary channel sand bodies. Detail characterization of single sand body reveals that there are 5 main superposition patterns, including overlapping, multi-boundaries, single-boundary, juxtaposition and isolation. We summarize 8 recognition marks of single sand body for vertical timing and lateral boundary recognition. Moreover, 6 correlation principles of single sand body are proposed. By using this model, totally 56 single sand bodies were recognized in the first member of Putaohua oil formation of central Xingshugang oil field and the reasonability of division and correlation of single sand bodies was verified in late production.