川西地区老井挖潜选井评层标准研究
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摘要
老井挖潜以其"投资少、见效快、周期短"的优点,成为油气藏勘探开发中增储上产、增收节支、降本增效的重要举措。以新场气田为例,针对致密砂岩气藏复杂的地质特征,通过建立地震识别原则、录井地质综合指标评价标准和测井电性标准,结合储层改造工艺的特点,形成老井挖潜选井评层研究的思路与方法,实现挖潜选井评层标准由定性向定量化的转变。就新场气田而言,目前阶段,蓬莱镇组气藏"强波峰、低频率"和沙溪庙组气藏"低频率、强振幅"的特征作为老井挖潜选井评层的地震识别原则及标准是适用的;在对挖潜获得成功的含气层的测井响应及解释资料归纳总结,并与蓬莱镇组、沙溪庙组历年挖潜获得成功的气层的测井响应特征结合的基础上,建立的挖潜选井评层测井电性标准、特别是给出的储层电性特征推荐值是可靠的,可以为老井挖潜选井选层提供参考。
Potential tapping in old wells has been an important measure to enhance production and decrease cost in exploration and development of the hydrocarbon reservoirs for its advantages of less investment,quick effect and short cycle.According to the complicated geological characteristics of Xinchang tight sandstone gas reservoir and combined with the characteristics of reservoir reconstruction technology,ideas and methods of well choosing and formation evaluation for tapping the potential of the old wells are developed through the establishing seismic identification principle,standards of comprehensive geological logging evaluation indicators and electrical logging characteristics,which makes the qualitative standards turn to the quantitative standards.In the Xinchang gas reservoir,the available seismic identification principle and standards is the characteristics of "strong wave crest and low frequency" in Penlaizhen Formation gas reservoirs and "low frequency and strong amplitude" in Shaximiao Formation gas reservoirs at present situation.Log response and interpreted data of gas-bearing reservoirs through tapping the potential are summarized.Combined with the log response of the gas reservoirs through tapping the potential in Penlaizhen Formation and Shaximiao Formation over the years,standards and characteristics of electrical logging for the reservoirs are established and reliable,which may provide references for well choosing and formation evaluation on tapping the potential of the old wells.
引文
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