井壁取心与地化录井技术在冀东油区中浅层勘探中的配套应用

Matching application of sidewall coring and geochemical logging technology in middle-shallow layers exploration in Jidong oil area

以往冀东油区中浅层勘探中,常规录井效果良好,但钻井工艺技术的不断发展对岩屑录井的影响不断增大,不仅岩屑代表性逐渐变差,中浅层中大量存在的低电阻率、低气测异常层也给解释评价带来了困难。鉴于井壁取心能够有效保留储集层含油信息,弥补岩屑录井的不足,而地化录井能够定量检测岩石含油信息,反映储集层含油性,通过对井壁取心地化解释方法研究,优选出敏感参数S 1和OPI,并建立了解释评价图板。目前,新方法在冀东油区中浅层勘探中应用效果显著,截止到2018年底,解释符合率提高至81.5%,有效解决了冀东油区中浅层储集层含油性识别难题,为试油选层及下一步勘探开发提供了有力支撑。

In the past,conventional mud logging has achieved good results in the exploration of middle-shallow layers in Jidong oil area.However,the influence of the continuous development of drilling technology on cuttings logging is increasing.Not only is the representative of cuttings getting worse and worse,but also there are a large number of low resistivity and low gas logging anomaly beds in the middle and shallow layers,which make interpretation and evaluation difficult.In view of the fact that sidewall coring can effectively retain reservoir oil-bearing information and make up for the shortcomings of cuttings logging,geochemical logging can quantitatively detect rock oil-bearing information and reflect reservoir oil-bearing property.Through the study of geochemical interpretation method for sidewall coring,the sensitive parameters S 1 and OPI are optimized,and the interpretation and evaluation chart is established.At present,the application effect of the new method in the exploration of the middle-shallow layers in Jidong oil area is remarkable.By the end of 2018,the coincidence rate of interpretation has been increased to 81.5%,which effectively solves the problem of oil-bearing reservoir identification of middle-shallow layers in Jidong oil area,and provides a powerful support for selecting pay zone of well test and further exploration and development.