涩北气田有效储层及盖层测井研究  

LOG ANALYSIS OF THE EFFECTIVE RESERVOIRS AND CAPROCKS IN SEBEI GAS FIELD

作　　者：谢丽[1] 杨体源[1] 张审琴[1] 

机构地区：[1]青海油田公司勘探开发研究院

出　　处：《天然气工业》2003年第5期30-33,共4页Natural Gas Industry

摘　　要：涩北气田为一成岩程度较低的砂泥岩浅层大型气田 ,岩心实验表明各种粒级的砂质和泥质岩类孔隙度相差不大 ,尤其对泥质含量高的储层气层电性特征不明显 ,不能有效地划分储层。根据涩北气田的储层和盖层的特征 ,文章提出采用排驱压力法来区分储层和盖层 ,通过岩心分析和试油结果建立的泥质含量、产能、渗透率与排驱压力的关系表明 ,排驱压力与泥质含量为很好的正相关的关系 ,储层与盖层排驱压力差越大产能越高 ,而排驱压力与岩心渗透率有良好的负相关关系 ,说明采用排驱压力可以较理想地识别储层。考察各测井资料与排驱压力关系 ,确定自然伽马的相对值和电阻率与排驱压力关系密切 ,因而建立起测井资料与排驱压力关系 ,进而比较全面地建立起了一套适用于该浅层生物气田的测井储层评价方法。使用该方法 ,对涩北气田的储层进行了重新解释 ,新层经试油得到验证 。Sebei gas field is a large sized shallow sand sh ale gas field and the sandshale has a relatively low diagenesis.Through core ana lysis,it was indicated that there is a little difference between the porosities of sandy rocks and those of shaly rocks and the electrical behaviors of reservoi rs are unnoticeable especially for the reservoirs with high shale content,so the reservoirs can't be effectively determined.In light of the characteristics of t he reservoirs and caprocks in Sebei gas field,it is proposed in the paper that t he reservoirs can be differentiated from the caprocks by displacement pressures. According to the results of core analysis and gas production test,the relations between displacement pressure and shale content,productivity or permeability wer e set up ,which indicates that the displacement pressure is well positively corr elated with the shale content and close negatively correlated with permeability; and the larger the difference between the displacement pressure in reservoir and the one in caprock,the higher the productivity.So the reservoir can be well dis criminated by the displacement pressure.Through studying the relation between th e displacement pressure and log data,it was found out that the relative value of natural gamma ray log and the resistivity log are closely related to the displ acement pressure,thus setting up their relationships and achieving a suit of log ging reservoir evaluation methods suitable for such a shallow biogas field.By us e of these methods,the reservoirs in Sebei gas field were reinterpreted and the results were verified by gas production tests,which plays an important role in i ncreasing reserves and production in the gas field.

关 键 词：涩北气田 储层 盖层 测井 排驱压力 评价 

分 类 号：P631.8[天文地球—地质矿产勘探]