含油气盆地岩性油气藏的形成和分布特征

Predominant characteristics of formation and distribution for lithologic reservoirs in petroliferous basin

根据岩性油气藏的形成条件、形成过程及分布特征,与构造油气藏相比,岩性油气藏的形成及分布更具有优势,主要表现在6个方面:①岩性圈闭形成较早,形成期次比较多,有利于更多地捕集油气;②油气仅靠初次运移和短距离的二次运移就可以成藏,不一定需要长距离二次运移;③岩性油气藏烃类充注相对较早;④岩性油气藏保存条件更为优越;⑤岩性油气藏可以分布在低势区,也可以分布在高势区;⑥岩性油气藏可以富集在低水位体系域,也可以富集在高水位体系域。油气勘探实践表明,岩性油气藏具有更优越的形成条件和更大的勘探潜力,是今后油气勘探的重点。

The comparison of the lithologic reservoir with the structural reservoir shows that the lithologic reservoir has more predominant conditions in formation and distribution. The formation of lithologic traps is earlier,and there are more forming periods. The lithologic reservoirs can be formed only by primary oil-gas migration and secondary oil-gas migration in short distance. The lithologic reservoirs can be charged in the early era and experienced little destroy in the late structural activities. The lithologic reservoirs can be distributed not only in the low-potential areas, but also in the high-potential areas. The lithologic reservoirs can be enriched not only in lowstand system tract, but also in highstand system tract. So the lithologic reservoir has some predominant formation conditions and a great exploration potential.