东营凹陷太古界基岩储层特征及分布规律研究

Study on characteristics and distribution of Archaeozoic reservoir in Dongying Sag

针对东营凹陷太古界基岩储层特征、分布规律认识不清的问题,利用岩心观察、岩石薄片鉴定和测井资料分析,并结合常规孔、渗资料,对储层岩石类型、储集空间、物性特征等进行了深入的研究。结果表明:东营凹陷太古界的储集岩主要为花岗岩类、闪长岩类及脉岩类;太古界潜山内幕的储集空间以各类裂缝为主,淋漓孔与溶蚀孔较发育,具有一定的储集性能;太古界储层属于裂缝性储层,在纵向上和平面上都表现出极端的非均质性;太古界储层主要集中在距潜山顶面0～30m,30～60m,60～100m等3段范围内的潜山风化壳,横向对比难度较大,平面上储层围绕潜山呈条带状展布。

The rock type,reservoir space and physical property of Archaeozoic reservoir are studied by means of core observation,thin section and logging analysis.The result shows that Archaeozoic reservoir rocks are mainly composed of granitic rock,dioritoid and dike rock;the reservoir space of Archaeozoic burial hill is mainly fracture;emposieu pore and eluvial pore are valid for oil and gas accumulation;the Archaeozoic reservoir belongs to fractured reservoir with strong heterogeneity both in vertical and areal,and mainly developed in three intervals （the range from 0 to 30 m,from 30 to 60 m and from 60 to 120 m） under the apex face of burial hill and distributed around burial hills presented in banded in the plane.