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

针对雁木西油田白垩系低阻油层受沉积相带及其断裂、构造和岩性等多种因素控制影响，测井信息应用难度增大的特点，采用地层倾角测井资料确定古水流方向、砂体延伸、层理构造和微相特征.利用倾角方位频率矢量统计，确定出白垩系K1s3、K1s2、K1s1目的层段古水流及其相应河道砂体延伸方向为北北东20°.利用层理构造倾角模式分析，确定出白垩系K1s3、K1s2、K1s1期分别发育楔状交错层理、波状斜层理、波状交错层理和水平层理，结合岩心、井径、自然伽马和微侧向电阻率曲线特征，分别阐明白垩系K1s3、K1s2到K1s1期水动力能量由较高到较低变化，形成了扇三角洲前缘扇中的水下辫状河道到扇端的浅水河道有利微相砂体发育带，它们由南南西向北北东方向展布，控制着研究区最为有利的油气储集砂体分布.

Application of dip logging to Cretaceous sedimentary micro-facies in the Yanmuxi oil field

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.