大牛地气田致密砂岩储层测井评价

Logging evaluation technique for tight sandstone reservoir in Daniudi Gasfield

(中国石油化工股份有限公司石油勘探开发研究院,北京100083)

Exploration and Production Research Institute,SINOPEC,Beijing,100083

针对大牛地气田低渗、低孔致密岩性气藏，建立了一套适用的测井识别与评价技术。通过分析大牛地气田上古生界致密储层的“四性”关系,深化了对大牛地气田上古生界低孔、低渗致密含气储层测井响应特征的认识；分类提取了测井特征参数,建立了大牛地气田的气层测井划分标准和分类评价标准,为正确评价储层及气层提供了技术条件。提出了对储层进行产能预测评价的方法——测井参数优化合成法,利用孔隙度、有效储层厚度、密度、电阻率、泥质含量、声波时差和含气饱和度,分不同层组建立了无阻流量的合成系数公式以及无阻流量的估算公式。实际资料处理结果表明,预测产量与实际产量较吻合,为油气井后期测试投产提供了依据。

In order to provide logging technique guarantee for the productivity construction of Daniudi Gasfield,a series of logging identification and evaluation techniques suitable to low pressure,low permeability,low porosity and tight sandstone gas reservoirs.By analyzing the four properties relationship of upper Paleozoic tight reservoir of Daniudi Gasfield,the logging response of low porosity and low permeability gas-bearing reservoir was deeply recognized.the logging characteristic parameters was extracted by types,and the logging classification and evaluation standard for gas reservoirs in Daniudi Gasfied were established,which provide technical conditions for correctly evaluating reservoirs.Logging parameter optimization synthesis method,a method for evaluating productivity prediction,was established,which uses porosity,effective reservoir thickness,density,resistivity,shale content,acoustic traveltime and gas saturation,and establishes synthetic coefficient and estimation formula of Absolute Open Flow according to the formation set.Actual log data processing results indicate that predicted production is coinciding with actual data,which offers basis for further testing and commissioning of gas well.