尼日尔Agadem区块低阻油层成因及其分布规律研究

Study on Genesis and Distribution Law of Low-resistivity Oil Reservoir in Agadem Oilfield in Niger

低阻油层在Agadem区块分布广泛,具有巨大开发潜力,本文以研究区静态、动态资料为基础,开展Agadem区块低阻油层成因分析、分布特征研究。岩芯化验资料分析认为,砂泥岩薄互层和高不动水是形成该区低阻油层的两个原因,在此基础上识别出薄层、高不动水和双重因素成因三类低阻油层,明确单一成因低阻油层产能高于双重成因低阻油层产能。岩芯描述和测井相分析表明沉积微相是本区低阻油层分布的主要控制因素,纵向上沉积能量相对较弱的E1油组是低阻油层主要发育层位,平面上三角洲前缘远端席状砂、远砂坝微相是低阻油层主要分布区域;低阻油层评价及分布研究有效指导了Agadi油田投产方案的编制,实施后取得良好的效果。

The low -resistivity pay is distributed widely in Agadem oilfield, which has enormous development potentiality. This paper carry out low - resistivity pay genesis, potential evaluation in Agadem oilfield based on static and dynamic information. Through the analysis of core experiment data, sand shale sequence and high bound water are the main genesis of low - resistivity pay in Agadem oilfield. On the basis of genetic analysis, three types of low - re- sistivity pay including the thin genesis, high bound water genesis and composite genesis are identified and the productivity of the low - resistivity pay caused single factors is higher than the one caused composite factors. Core description and logging facies analysis show that sedimentary microfacies is the key factors of the distribution of low - resistivity pay in this area. low - resistivity pay is distributed in E1 oilgroup vertically where deposited energy is rel- atively weak and the sheet sand, distal bar in the delta front is the main distribution area of low - resistivity pay in the plane. The study on recognition, evaluation, and distribution of low - resistivity pay is an effective guidance in the compilation of Agadi oilfield production program, and the good results of development are achieved.