烃碱流体对兴城地区营一段火山岩储集层的改造作用

摘要/Abstract

摘要： 徐深气田兴城开发区营城组火山岩气藏储集层以酸性火山岩为主,储集空间可分为原生孔隙、次生孔隙和裂隙3 种类型。烃碱流体对火山岩的改造作用主要反映在次生孔隙带的形成、发育程度上,这取决于烃碱流体在储集层中引起物质带入与带出的比例。由于火山岩体处于开放体系下,原有矿物发生交代蚀变、溶蚀,使岩石内部结构受到破坏而造成机械强度减低,孔隙度增加,具有多孔隙高孔洞,这非常利于构造破碎、吸引热液和矿质富集。但烃碱流体不仅可导致原有矿物发生蚀变、溶蚀使孔渗增加,也可以充填、阻塞孔隙而使孔渗降低。本区特殊的岩性岩相及构造因素使得烃碱流体带出量大于带入量,次生孔隙发育、连通成次生孔隙带,构成了很好的运移通道和储集空间。

关键词: 徐深气田, 烃碱流体, 次生孔隙, 交代作用, 火山岩

Abstract: The volcanic gas reservoir of Yingcheng formation in Xushen gas field in Xingcheng region is dominated by acidic volcanic rocks with reservoir spaces like primary pore, secondary pore and fissure. The reformation effect of hydrocarbon alkali fluid on the volcanic rocks appears in the formation and development of secondary pore zone, which lies on the scale of material inflow and outflow in the reservoir caused by this fluid. The volcanic reservoir reformation by the fluid under open system includes primary mineral metasomatic alteration and dissolution, which leads to damage of inner structure of the rocks, such as mechanical strength reducing, porosity increasing. The structure is very favorable for structural fragmentation, attracting hydrothermal liquids and mineral enrichment. The hydrocarbon alkali fluid can not only cause porosity and permeability increasing by the alteration and dissolution of primary minerals, but also make porosity and permeability decreasing by packing or filling pores. The study shows that the particular lithology and lithofacies as well as structural factors in this region lead to that the outflow rate is larger than the inflow rate by hydrocarbon alkali fluid, the developed secondary pores could be connected into secondary pore zones, which can be as good migration channels and reservoir spaces.

Key words: Xushen gas field, hydrocarbon alkali fluid, secondary pore, metasomatism, volcanic rock

中图分类号:

TE112.222

柳成志, 于海山. 烃碱流体对兴城地区营一段火山岩储集层的改造作用[J]. 新疆石油地质, 2010, 31(2): 135-138.

LIU Cheng-zhi, YU Hai-shan. Reformation Effect of Hydrocarbon Alkali Fluid on Volcanic Reservoir in First Member of Yingcheng Formation in Xingcheng Region[J]. Xinjiang Petroleum Geology, 2010, 31(2): 135-138.

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