气藏成藏富集与储层物性关系探讨——以川西坳陷东坡沙溪庙组河道砂气藏为例

Discussion on Reservoir Enrichment Gas Reservoirs and Reservoir Property Relations—Taking Dongpo Shaxi Temple Group Channel Sand Reservoir in the West Sichuan Depression as the Example

储层物性条件是致密气藏能否高产的主要因素之一,川西坳陷东坡沙溪庙组钻井证实,高产工业气井,获产都在优质储层段,但钻遇优质储层段,钻井不一定能获产。本文以川西坳陷东坡沙溪庙组典型完钻井分析为基础,解剖不同局部构造上的气藏富集特征以及成藏匹配条件,探讨储层物性条件与成藏富集的相互关系。研究发现,在相同(似)沉积、成岩条件下,非油气富集区域,钻井揭示储层致密,而油气富集区域,储层孔渗条件好。研究认为,在其它成藏富集条件相近的情况下,储层物性条件是控制油气富集的基础;油气富集是储层孔隙空间得以保存的重要因素,故现在储层致密,并不代表成藏期储层物性条件差,可能是油气未有效充注,后期成岩作用强的表现。该认识成果在川西坳陷中浅层气藏勘探开发中得到验证,类比分析可以推广指导其它地区油气勘探开发。

Reservoir is tight gas reservoir can be one of the main factors for high yield. Dongpo Shaxi Temple group confirmed by drilling in Western Sichuan depression that high-yield industrial gas well pro-duction won in high quality reservoir section, but for the drilling quality reservoir, drilling cannot obtain property. Taking typical drilling analysis of the West Sichuan Depression Dongpo Shaxi Tem-ple group as the foundation, the paper analyzes the local structure of the anatomy of different gas enrichment characteristics and reservoiring matching conditions, and the relationship between re-servoir enrichment of a reservoir. It has been found that in the same (similar) sedimentary and di-agenetic conditions, the area of non oil and gas enrichment, the drilling reveals that the reservoir is dense, and the oil and gas enrichment area is good for the reservoir porosity and permeability. It is believed that the reservoir physical condition is the basis for controlling the accumulation of oil and gas under the condition that other accumulation and accumulation conditions are close, and the ac-cumulation of oil and gas is an important factor for the preservation of the pore space of the reser-voir. Therefore, the reservoir is dense and does not represent the poor physical condition of the re-servoir during the reservoir formation period, which may be the failure of the oil and gas filling and the strong performance of the later diagenesis. The results of cognition in the Western Sichuan de-pression in the shallow gas reservoir exploration and development have been verified, analogy analysis can be extended to guide oil and gas exploration and development in other areas.