关键词: 立体勘探, 天然气, 进展, 实践经验, 四川盆地

Abstract:

Shangjia region is outside of Sanzhao source area, and K₁q₂ reservoir is below K₁qn₁ source rocks. The migration mechanism of oil from  K₁qn₁ to Shangjia region is analyzed. Oil in Sanzhao source area firstly migrated downward into Fuyang reservoir through T2 faults under the action of overpressure, and then migrated to Shangjia region through sand bodies connected by faults under the action of buoyancy, finally directlymigrated and accumulated in high fault block traps of  K₁qn₂ which were in contact with Fuyang reservoir. The oil accumulation and distribution of K₁q₂ in Shangjia region are mainly controlled by three factors: high fault block traps developed in K₁q₂， high fault block traps located in the pathway of oil migration and sand bodies developed in high fault block traps. Based on the analysis of main controlling factors, it is considered that typeⅠfavorable areas of oil accumulation of K₁q₂ in Shangjia area mainly distribute in the areas controlled by Shang 9-6, Shang 118-120 and Shang 124-112 wells and around Sheng 26-14 well， and type Ⅱfavorable areas mainly distribute in the northern region along Shang 9-6 and Shang 118-120 wells.

Key words: stereoscopic exploration, natural gas, progress, practice experience, Sichuan Basin