南堡凹陷北堡地区火成岩储层特征

CHARACTERISTICS OF PYROLITH RESERVOIRS IN BEIPU AREA, NANPU SAG

周海民 马乾

Zhou Haimin Ma Qian

北堡地区构造上位于黄骅坳陷南堡凹陷西部,发育4套火成岩储层组合,火成岩类型主要包括火山溢流相的玄武岩和火山爆发相的火山碎屑岩,储集空间为裂缝和粒间孔隙。钻井和测井结果表明:沙河街组二段的凝灰岩及沙河街组三段的厚层玄武岩顶底面的裂缝及孔隙发育,具有较好的勘探前景。另外,火成岩上下的砂岩,因岩浆作用,孔渗性得以改善,应引起勘探者的重视。

Four sets of pyrolith reservoir assemblages have been identified in Beipu area, western Nanpu sag,Huanghua depression.The main pyrolith types include flood basalt and eruptive pyroclastic rocks, and the reservoir spaces are composed of fissures and intergranular pores. Drilling and logging results indicate that there are abundant fissures and pores in tuff on top and bottom of thick basalt in the 2nd and 3rd members of Shahejie Fm., respectively, which will have relatively good exploration potential. Additionally, the sandstones above and below the pyrolith,being affected by magmatic activity, the poroperm characteristics would have been improved.It is,therefore, suggested that the explorer should pay much attention to the sandstones.

10.11743/ogg20030108