葡西油田油水层识别

葡西油田葡萄花油层以油水同层为主,油水分布复杂,储层类型多样,给测井解释油、水层带来较大难度。测井响应机理研究表明：储层高含泥、高束缚水饱和度和薄层、薄互层是形成低电阻率油层的主要原因;而储层致密、舍钙、舍残余油是形成高电阻率水层的主要因素;此外,油藏被破坏造成油水呈非均质分布,致使储层产油、产水交替出现。通过储层“四性”（指岩性、物性、含油性、电性）关系研究,应用细分层交会图版法、曲线形态对应性分析方法采综合识别油、水层。经试油、生产动态资料检验,综合解释符合率在85．0％以上。

Oil/water layer identification in Puxi Oilfield

Putaohua Reservoir is mainly oil/water mixed layer in Puxi Oilfield,with oil/water complicated distribution and various reservoir type,so it takes more difficult into logging interpretation on oil/water layer.Study on logging response mechanism shows that,reservoir with high mud and irreducible water saturation,thin layer and interlayer are main causes for forming low-resistivity oil layer,while being tight and containing calcareous and residue oil are main factors of forming high-resistivity water layer.In addition,oil/water heterogeneous distribution caused by reservoir damage leads to alternation change in producing oil and water in reservoir.Through study on reservoir "four properties"(including lithology,physical property,oil bearing and electric property),this paper identifies oil/water layer by applying subdivision cross plot and curve shape homologous method.Testing and production performance data examination shows that coincidence rate of integrated interpretation is more than 85.0%.