Study on the Micro-facies and Sandbody Distributions of ZJ1Ⅱ下LOil Group A Oilfield in the West of South China Sea

TONG Luyi,LI Biao,WANG Wentao,LU Yan,LI Xiaoxiao

Journal of Guangdong University of Petrochemical Technology（2022）

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Abstract

A油田生产层位为ZJ1Ⅱ下油组,平面上分为A1、A2两个井区生产.在过去的研究中,普遍认为ZJ1Ⅱ下油组属于一套临滨砂坝沉积.随着油田的开发生产,A 1井区和A2井区在生产动态特征上表现出较大差异,用原先的沉积模式已经不能进行合理解释.通过古生物分析、FMI成像测井分析、岩心观察和地震相分析,提出了新的沉积模式认识:ZJ1Ⅱ下油组沉积时期属于浅海沉积环境,A 1井区属于滨外滩坝沉积、A2井区属于滩砂沉积,两套砂体为不同期次的沉积物,因此并不连通.该认识不仅解释了之前沉积模式无法解释的种种矛盾,更为油田后续挖潜提供了有力的地质依据.

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