关键词: CO₂驱, 开发后期, 防气窜方法, 黏性指进, 重力超覆

Abstract:

Clastic rocks and dolomite are the main two reservoir types in Xingang area. The previous deep and wide exploration research is only for clastic reservoir. Research on dolomite reservoir characteristics and distribution is seldom, which restricts the dolomite reservoir exploration in this area. Through core analysis, logging and seismic data, based on the analysis of structure, deposition, source rock evaluation and single well reservoir, combined with data volume fusion technology, this paper carried out the prediction of dolomite reservoir distribution, and studied the oil and gas accumulation conditions of Es₃, and then made clear the dolomite reservoir exploration potential of Es₃ in Xingang area. The result shows that high-quality hydrocarbon source rocks developed in Es₃ in Xingang area, oil and gas reservoir type belongs to primary self-storage, and the distribution area is large. A lot of fractures and dissolved pores are developed in the dolomite reservoir of Es₃⁵ , which provides favorable places for oil and gas enrichment. This understanding has certain reference value for the study of the same type of dolomite reservoir.

Key words: CO₂ flooding, later stage of production, anti-gas channeling methods, viscous fingering, gravity overlap