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川西坳陷中浅层属于典型的致密砂岩气藏,经过十余年的开采已接近开发后期,各井区显示好的气层段已在建井早期投产或中期转层或新井开发,目前余下的多为地层压力低、录井显示弱、Ⅲ类难动用储层,其含气评价及产能预测,已凸现为制约老井挖潜选层、新井完井决策的新难题和攻关焦点。早期图版、传统录井评价技术的局限,已不能适应气藏后期低压、弱显示、难动用储层的评价环境和产量预测的新技术需求,通过创新气、水量化识别指标、拓展多指标集成评价,建立了具综合性、量化度和动态特征的录井评价及产能预测技术。经在洛带气田、新场气田老井挖潜和新井钻探现场应用,低压、弱气显示层建产率100%,产气量预测吻合率达85.7%,挖潜增产效果提升13.5-20.8倍,验证了新评价及产量预测技术的有效性好、可靠度高,展示其技术优势在老井挖潜、新井完井评价中具良好的推广应用前景。
The middle and shallow layers of the western Sichuan Depression are typical tight sandstone gas reservoirs. After more than ten years of mining, they have been approaching the late stage of development. The well sections in each well area have been well developed in the early stages of well construction or are under development in the middle stage or new wells. Most of them are low formation pressure and mud logging show weak and Class III difficult-to-use reservoirs. The gas evaluation and production capacity prediction have become the new problems and key points restricting the decision-making of new wells in prospecting for potential wells and new wells. In the early stage, the limitation of traditional mud logging evaluation technology can not meet the new technical requirements of low pressure, weak display and difficult reservoir evaluation environment and yield prediction in the late stage of gas reservoir. Through innovative gas and water quantification identification index, Evaluation, established a comprehensive, quantitative and dynamic characteristics of mud logging evaluation and capacity prediction technology. Through the field application in Laodai gas field, Xinchang gas field and the drilling of new wells, the production rate of low pressure and weak gas display layer is 100%, the forecast coincidence rate of gas production amounts to 85.7%, and the tapping potential productivity increases by 13.5-20.8 times. New evaluation and production forecasting technology has good effectiveness and high reliability, demonstrating that its technical superiority is potential for tapping the potential of the old well and has a good prospect of promotion and application in the completion evaluation of the new well.