西峰油田庄58井区长8_1储层出水原因

Causation of water producing for Chang 8_1 low permeability reservoir in Block Zhuang 58 of Xifeng Oilfield

西峰油田庄58井区长81油层厚度大,储层物性较好,测井解释含油饱和度较高,油层打开后多为高含水,生产能力低。在对西峰油田庄58井区长81储层基本地质特征进行研究的基础上,选取具有代表性的6块样品岩心进行了核磁共振可动流体评价研究,并采用铸体薄片和电镜扫描等手段,针对长81低渗透储层出水原因进行了分析研究。结果表明:绿泥石薄膜厚度越大往往可动流体饱和度越小。亲油性绿泥石薄膜吸附原油中重质组分是测井解释为油层或者油水层、但是打开后却出水不出油的主要原因。

Chang 81 reservoir, which is of large thickness, good reservoir physical property and high oil saturation in Block Zhuang 58 of Xifeng Oilfield, is characterized by high water saturation in early production period. It is necessary to analyze the cause of water producing in order to develop the reservoir economically and effectively. Based on the study of basic geological characteristics of Chang 81 reservoir in the block, the movable fluid evaluation and research were made with six cores using nuclear magnetic resonance technique. The causes of water producing were analyzed for Chang 81 low permeability reservoir by using SEM and casting thin sections methods. The study results show that the thicker chlorite films is, the smaller the saturation of movable fluid will be. The heavy component absorbed by lipophilic chlorite films is the main reason that the water is produced after implementing perforation without oil in the reservoir although the reservoir is interpreted as oil layer or oil-water layer by logging interpretation.