岩性油气藏 ›› 2022, Vol. 34 ›› Issue (2): 4553.doi: 10.12108/yxyqc.20220204
崔俊, 毛建英, 陈登钱, 施奇, 李雅楠, 夏晓敏
CUI Jun, MAO Jianying, CHEN Dengqian, SHI Qi, LI Yanan, XIA Xiaomin
摘要: 柴达木盆地西部地区古近系下干柴沟组上段(E32)至上油砂山组(N22)广泛发育湖相碳酸盐岩。为研究其分布及储层发育特征,开展岩心观察、薄片鉴定、扫描电镜及X射线衍射分析等工作。结果表明:①研究区湖相碳酸盐岩具有岩石类型多、相变快、陆源碎屑发育、普遍白云石化等特点;主要岩石类型有块状碳酸盐岩、纹层状碳酸盐岩、藻灰岩、颗粒碳酸盐岩,其分布与沉积微相及古环境密切相关。②研究区块状碳酸盐岩储集空间以晶间孔为主,局部发育裂缝,纹层状碳酸盐岩顺层微裂缝发育,藻灰岩储集空间以藻格架孔为主,非均质性强,颗粒碳酸盐岩受胶结作用影响显著。③块状碳酸盐岩平均孔隙度为10.6%,平均基质渗透率为0.03 mD,排驱压力为10.0 MPa,平均孔喉半径为0.038 μm;纹层状碳酸盐岩平均孔隙度为7.4%,平均渗透率为0.76 mD,排驱压力为11.5 MPa,平均孔喉半径为0.071 μm;藻灰岩平均孔隙度为10.1%,平均渗透率为9.09 mD,排驱压力为3.2 MPa,平均孔喉半径为0.117 μm;颗粒碳酸盐岩平均孔隙度为7.1%,平均渗透率为0.01 mD,排驱压力为15.0 MPa,平均孔喉半径为0.026 μm。④尕斯地区古近系优质储层以藻灰岩为主,英西—干柴沟地区的碳酸盐岩发育裂缝系统,为高产“甜点”区;茫崖凹陷为勘探潜力区。该成果对柴达木盆地古近系湖相碳酸盐岩油气勘探具有借鉴作用。
中图分类号:
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