岐口凹陷沙河街组次生孔隙特征及成因研究

通过对歧口凹陷沙河街组深部碎屑岩储集层中的孔隙研究,认为歧口凹陷沙河街组发育七种孔隙类型及四种喉道类型,对次生孔隙的结构特征与发育特征进行了详细论述。并系统地分析了次生孔隙的形成机制,认为次生孔隙的形成以有机成因为主,无机成因为辅,二者共同作用形成。深入探讨了影响次生孔隙发育的地质因素,并根据孔隙结构及其它多种因素对储层进行了评价。

Study on characteristics and causes of the forming of secondary pores in Shahejie Formation of Qikou Depression

According to the study of pores of deep elastic reservoir in Shahejie Formation of Qikou Depression, there are 7 pore types and 4 pore throat types. The textural characteristics and development characteristics of secondary pores were described particularly. The formation mechanism of secondary pores was analyzed systemically. It was ensured that the forming causes of secondary pores were organic cause and the inorganic Cause was subordinate, and the former is the main cause while the latter is subordinate and the two causes reacted together. The geologic factors which influenced the development of secondary pores were discussed, and the reservior was evaluated based on the pore texture and other factors.