摘要
通过岩心观察、岩心物性统计和薄片鉴定等方法,对民丰洼陷沙三段储层物性影响因素和孔隙成因进行研究。结果表明:民丰洼陷沙三段各亚段储层物性存在一定的差异,具有中-高孔渗的特点,孔隙类型以粒间溶蚀孔隙为主,储层孔隙结构总体以中-细喉为主;岩石分选性控制着储层原始物性发育特征并影响后期成岩作用对储层的改造,分选性的差异是三角洲前缘水下分流河道、河口砂坝原始物性好,而远砂坝和近岸水下扇原始物性相对较差的原因;随埋深增加,在早期压实压溶作用和后期强烈钙质胶结作用影响下储层物性具有明显的降低趋势,但发育2个较明显的次生孔隙发育带;次生孔隙的形成主要是斜长石、岩屑等颗粒发生溶解作用的结果,分选好、原始物性好的储层更有利于次生孔隙的发育;分选、粒径、胶结、溶解等是储层发育的主控因素,据此可将研究区的储层划分为6种成因类型。
Influence factors of reservoir property and porosity genesis of Es3 in Minfeng sag were studied on the basis of core observation, thin section analysis, statistics and analysis of core porosity and permeability. The results show that there are certain difference in reservoir physical properties of each sub-member in Es3 and reservoir rock has medium to high porosity and permeability with dissolved inter granular pores as its dominantly pore types, and the mainly pore structure is medium- thin throat. The sorting controls the development of primary reservoir property and affects the rebuild of diagenesis to reser- voir. The sorting difference is the origin of good primary reservoir property of mouth bar and subaqueous distributary channel in delta front, and poorer of distal bar in delta as well as nearshore subaqueous fan. With the burial depth increasing, reser- voir property significantly decreases under the influence of early compaction and dissolution of sediments and later period Cal- cium cementation, while two secondary pore belts are developed distinctly. The forming of secondary pore is the result of dis- solution of plagioclase and rock debris. The reservoir rock with well sorting and physical property is favor to the development of secondary pore. The sorting, particle size, cementation and dissolution are main controlling factors for reservoir develop- ment, and six types of reservoir genesis are classified by the factors.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第4期10-15,共6页
Journal of China University of Petroleum(Edition of Natural Science)
