Application of dip logging to Cretaceous sedimentary micro-facies in the Yanmuxi oil field
地层倾角测井在雁木西油田白垩系沉积微相研究中的应用

Low resistivity reservoirs are influenced by sedimentary faces, faults, structure and other factors in the Yanmuxi oil field.Thus, application of logging data is not very easy there. The dip logging provides lots of reservoir messages such as channel direction, sand distribution, formation structure and sedimentary micro facies. By the statistics of angle orientations, we identify that fot K1s3, K1s2 and K1s1 zones palaeo-channel sedimentary sand orientation is N-NE 20°. The cross bedding patterns, current bedding and flat bedding have been determined in the Cretaceous system of all the above zones through dip model analysis. In couple of core, CAL ,GR, and MLL methods, we clarify the flow rate changing of the palaeo-channel, that generated favourable sedimentary facies like delta fan under water braided channel on frontal sides to shallow channel on the distal end. The orientation of sedimentary sand is distributed from SSW to NNE which dicates the best reservoir sand bodies in this area.