松南气田登娄库组沉积特征研究与潜力分析

Sedimentary Characteristics and Potential Analysis of Denglouku Formation in Songnan Gas Field

松南气田登娄库组气藏是碎屑岩储层,其主力层为登Ⅲ、登Ⅳ砂组,在近八年的开发过程中,存在单井储层钻遇率差异大、储层物性及含气性差异大,导致累产差异明显,需要从沉积方面深化研究。本文是在区域沉积背景研究的基础上,根据岩心、岩屑、岩性标志和测井相标志,确定研究区的主要微相类型,划分单井沉积微相。综合研究区的砂体与砂地比展布特征,研究各小层的沉积微相平面展布特征。通过分析认为本区为辫状河沉积,呈南北向条带状展布,发育辫状河道、心滩、冲击平原等沉积微相。研究成果对储层评价、井位优化部署等研究工作具有指导意义。

Denglouku formation gas reservoir in Songnan gas field is clastic rock reservoir. Its main layers are Deng III and Deng IV sand formations. During the past eight-year development, there are large differences in drilling rate of single well reservoir,reservoir physical properties and gas-bearing properties, resulting in obvious differences in cumulative production, which requires further study from the deposition. Based on the study of regional sedimentary background, according to core, cuttings, lithologic and logging facies markers, the main microfacies types in the study area were determined and single well sedimentary microfacies were divided. The plane distribution characteristics of sedimentary microfacies of each sublayer were studied by synthesizing the distribution characteristics of sand body and sandstone percent in the study area. Through analysis, it was considered that the area is braided river sediment, which distributes in the North-South direction, and developed braided channel, channel bar, flood plain and other sedimentary microfacies. The research results have guiding significance for reservoir evaluation and well location optimization.