辽河坳陷洼609井区火山岩储集层的储集空间特征

辽河坳陷洼６０９ 井区火山岩位于中生界和下第三系两套地层中， 中生界以中酸性熔岩为主，新生界以基性熔岩为主。主要岩类有玄武岩、安山岩、流纹岩、辉绿岩、自碎火山角砾岩、火山碎屑岩等。储集空间包括原生的孔隙和裂缝以及次生的溶孔和裂缝。储集空间的形成和演化可以分为六个阶段：火山岩形成时原生孔隙形成阶段；火山岩体遭受风化剥蚀形成次生溶蚀孔、洞、缝阶段；火山岩体遭受埋藏和构造断裂形成构造缝阶段；大气淡水以及地下水对火山岩体的溶蚀和充填作用；生油岩有机质成熟形成的有机酸对火山岩体的溶蚀作用；油气对孔隙的充填阶段；热液作用始终对储集空间起破坏作用。

Reservoir space feature of the volcanic rocks in the area of Well Wa 609, Liaohe sag.

The volcanic rocks are located in Mesozoic group and Lower Tertiary group in the area of Well Wa 609, Liaohe sag. In the Mesozoic group, most of the volcanic rocks are neutral acid, and basic rocks in Lower Tertiary. The main kinds of the rock are basalt, andesite, rhyolite, auto breccia and pyroclastic breccia etc.. Reservoir space consists of primary space (involving fracture) and secondary space (involving dissolved pore and fracture). There are 6 periods in formation and evolution of the reservoir space: Forming primary space when the volcanic rocks generated; Forming secondary dissolved cave, pore and fracture due of weathering and denudating; Forming structural fracture by faulting; Forming dissolved space or filling the formed space by metorological water and underground water; Dissolving the rocks or fillings like organic acid and oil and gas filling the space. Hydrothermal process always destroys the reservoir space.