敖南油田葡萄花油层沉积微相分析

STUDY ON SEDIMENTARY MICROFACIES OF PUTAOHUA FORMATION IN AONAN OILFIELD

通过观察岩心，结合测井、录井资料，运用最新沉积学方法，分析了敖南油田主要研究层姚家组一段（K1y1）发育的沉积微相类型及其特征，建立了相标志，搞清了不同体系域沉积相、亚相、微相的空间展布。纵向上，研究层段三角洲外前缘较发育，向上外前缘的面积逐渐增大；平面上，以三角洲相沉积为主，在研究区北部和西北部主要发育三角洲外前缘。研究区的主体砂岩为牵引流成因的席状砂、滨湖砂沉积，其典型特征是三角洲前缘亚相沉积的灰色薄层砂岩，具有很好的岩性油藏成藏条件。

Through the observation of rock core and the application of updated sedimentology method, combined with well logging data and mud logging data , the types and characteristics of sedimentary microfacies, developed in Member Ⅰ of Yaojia Formation （ K1 y1 ） in Aonan Oilfield, are analyzed in this paper. The facies markers are established. Besides, the spatial distribution of sedimentary facies, subfacies and microfacies in different system tracts are made clear. The external delta front of studied layers is vertically developed well with gradually increasing area upwards. Areally, delta facies sedimentary is the major sedimentary type and external delta front is developed in the north and northwest of studied area. In the studied area, the main sandstones belong to sheet sand and shore sand of drag flow genesis, characterized by grey thin sandstone of external delta front subfacies deposit with fine reservoir-forming conditions for lithologic deposit.