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惠民凹陷下第三系砂岩经历了压实、胶结、溶蚀、交代和重结晶等多种成岩作用。其中压实、胶结和溶蚀作用对储层性质影响最大。压实作用的平均减孔率为0.78%/100m,中部和南部较高,北部较低。胶结作用对储层性质的影响表现在埋深大于1500m以后,其减孔率为8-20%。溶蚀作用主要出现在1400-2500m和2700-4000m两个深度段,以长石溶蚀为主,其次是碳酸盐胶结物的溶蚀作用,溶蚀作用新增的孔隙度大约为4-14%。砂岩经历了早成岩A、早成岩B和晚成岩A阶段,目前大多处于晚成岩A2期。砂岩储层孔隙可以分为原生孔隙和次生孔隙两大类。
The Lower Tertiary sandstone in the Huimin Depression underwent diagenesis such as compaction, cementation, dissolution, metasomatism and recrystallization. Among them, compaction, cementation and dissolution have the greatest impact on reservoir properties. The average reduction rate of compaction was 0.78% / 100m, higher in the central and southern part and lower in the northern part. The effect of cementation on the properties of the reservoir shows that the hole-reducing rate is 8-20% when the buried depth is more than 1500m. Dissolution mainly occurs in two depths of 1400-2500m and 2700-4000m, mainly feldspar dissolution, followed by dissolution of carbonate cements. The newly added porosity of dissolution is about 4-14%. Sandstone experienced early diagenesis A, early diagenetic B and late diagenetic A stage, mostly in late diagenetic A2 period. Sandstone reservoir pores can be divided into primary pores and secondary pores two categories.