靖边气田动态精细评价及水平井开发技术研究与实践

DYNAMIC EVALUATION AND HORIZONTAL-WELL DEVELOPMENT TECHNOLOGY FOR JINGBIAN GASFIELD

靖边气田马五1+2气藏含气面积大、井数多、储层渗透率低、非均质性强、单井产量低,经过多年开发后气藏非均衡开采严重,开展精细的气藏动态评价存在难度。通过动静态资料结合,形成了地层压力评价、动态储量评价、产能评价等低渗非均质气藏动态精细评价技术,落实了气田开发动态指标,并创新应用相控建模技术形成了靖边气田碳酸盐岩气藏基于动态约束的地质建模方法,准确刻画了沟槽的分布形态和描述了储层属性的非均质性。另外针对靖边碳酸盐岩气藏"古地貌侵蚀沟槽发育导致井位优选难度大,气层薄、局部小幅度构造变化快导致地质导向难"的特点,技术攻关和现场实践相结合,形成了靖边气田水平井开发技术,为靖边气田单井产量提高及气田的持续稳产提供了技术支撑。

For Jingbian gasfield with large area and many wells,the reservoirs are characterized by low permeability and strong heterogeneity;and most single wells have low yield.After years of development,the unbalanced recovery caused difficulties to the fine dynamic evaluation of reservoir.Based on the dynamic and static data,three technologies of dynamic evaluation were formed for low-permeability and heterogeneous gas reservoirs,including formation pressure evaluation,dynamic reserves evaluation,and productivity evaluation.Moreover,some dynamic indexes were confirmed.By facies-controlled modeling,a geologic model based on dynamic constraint was formed for carbonate reservoir in the field.Therefore,the trough distribution and reservoir properties were accurately described.In this field,the development of palaeogeomorphic erosion trough led to difficulty to optimize well site,and the thin gas-bearing formation and rapid change of local low-amplitude structure caused geosteering difficulty.So,a technology of horizontal-well development was formed to provide support for single-well production increasing and stable yield in long term.