滴南凸起滴西12井区薄层低电阻率气层识别技术

Technology for Identification of Thin and Low-Resistivity Gas Zone in Dixi-12 Wellblock in Dinan Swell of Eastern Luliang Uplift,Junggar Basin

滴西12井区位于准噶尔盆地陆梁隆起东段的滴南凸起上,该区钻探显示白垩系呼图壁河组储集层均为1至几米的薄砂层互层,区域勘探阶段,有3口井5个层段在呼图壁河组呼一段获高产工业气流,展示了该区呼图壁河组薄层砂体具有极高的含气潜力。由于该区域白垩系呼图壁河组油气水分布复杂,表现为"一藏一砂",加之地层水性质变化较大,应用常规电阻率解释的油、气、水层与实际试油结果符合率低。采用录井与测井相结合识别气层,极大地提高了气层识别的准确率,该方法用于老井重新评价,取得了较好的效果。

The drilling of Dixi- 12 Wellblock displayed that its Hutubihe reservoir of Cretaceous was composed of interbedded thin sand- stone from one meter to several meters in thickness, in which high-yield commercial gas flow was found in five intervals of Hu-1 member in three wells, showing such thin sands of this formation are of great potentials. In view of the complex distribution of oil, gas and water of the Hutubihe formation and varied formation water property, integrated with its characteristic of one reservoir and one sand zone. it is indicated that the interpreted results by using conventional resistivity analysis method for oil, gas and water are less accordant with real formation testing results. This paper presents the technology for comprehensive identification of gas zone by logging data and well logs, which ex- tremely enhances the accuracy of gas zone recognition and good effects are obtained ＇after applied to the old wells for re-evaluation.