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我国南方 ,特别是西南地区震旦系白云岩具有良好的油气储集潜力。四川盆地西南部震旦系白云岩储层多集中分布在灯影组的中、上部 ,储集空间以次生成因的孔、洞、缝为主。这些孔隙的形成与演化受多种因素的影响 ,其中成岩作用的控制明显 ,压实作用和多期白云岩的胶结作用使原生孔隙基本消失 ,而重结晶作用和溶解作用促进了次生孔隙的形成 ,但多期白云石和硅质的充填作用又导致次生孔隙缩小 ,局部消失。总之 ,震旦系白云岩储层内的孔隙是在长达六亿年左右的地质历史中 ,由各种成岩作用及其它因素相互影响下的最终产物。
The Sinian dolomites in southern China, especially in southwest China, have good hydrocarbon accumulation potential. The Sinian dolomite reservoirs in the southwestern Sichuan Basin are mostly concentrated in the middle and upper parts of the Dengying Formation, and the main accumulation pores, holes and seams in the reservoir space are concentrated. The formation and evolution of these pores are influenced by many factors, of which the control of diagenesis is obvious. The compaction and the cementation of multi-stage dolomites basically disappear the primary pores, while the recrystallization and dissolution promote the formation of secondary pores Formation, but the multi-stage dolomite and silicon filling effect also led to secondary pores shrink, local disappear. In conclusion, the pores in the Sinian dolomite reservoir are the final product under the influence of various diagenesis and other factors in the geological history of up to 600 million years.