超深层灰岩孔隙-微孔隙特征与成因——以塔里木盆地顺南7井和顺托1井一间房组灰岩为例

发布时间：2018-04-02 16:49

本文选题：孔隙　切入点：微孔隙　出处：《石油与天然气地质》2017年04期

【摘要】：超深层条件下灰岩是否具有有效储集空间,储层成因与储集性能如何等问题是深层-超深层油气勘探领域关注的课题之一。以塔里木盆地顺南7井、顺托1井一间房组灰岩为例,通过岩心观察、计算机断层扫描、薄片与阴极发光分析、扫描电镜等分析手段描述超深层灰岩的孔隙、微孔隙发育特征并探讨其成因。一间房组下段藻灰岩(以顺南7井为代表)孔隙以窗格孔、遮蔽孔为主要类型,其为沉积-成岩早期孔隙海水的胶结残余;微孔隙为分布于藻粒屑内部的方解石晶间微孔,其形成可能受重结晶作用与原始有机质演化的共同控制。一间房组上段生物粘结岩(以顺托1井为代表)孔隙以生物壳铸模孔、硅球与自形方解石集合体内部晶间孔隙为主要类型,微孔隙主要为生物体腔微孔、方解石重结晶形成的晶间微孔、灰岩基质中自形石英晶面微孔。成岩早期的热液流体改造可能是顺托1井生物粘结岩孔隙、微孔隙的主要成因,早期液态烃类充注对孔隙、微孔隙保存具有重要意义。由此表明,不同钻井不同结构特征灰岩的孔隙-微孔隙发育特征与成因不同,并进一步导致了灰岩储层发育与分布的控制因素存在差异。
[Abstract]:Whether the limestone has effective reservoir space, reservoir genesis and reservoir performance under ultra-deep conditions is one of the topics of concern in the field of deep and ultra-deep oil and gas exploration.Taking the limestone of Yilianfang formation in Shunan 7 well and Shunto 1 well in Tarim Basin as an example, the pores of ultra-deep limestone are described by means of core observation, computer tomography, thin slice and cathode luminescence analysis, scanning electron microscope and so on.The characteristics of micropore development and its origin are discussed.The pores of algal limestone (represented by well Shunan7) in the lower member of the Yijianfang formation are mainly composed of pan-pore and sheltered pore, which are the cemented residual of the early sedimentary diagenetic pore seawater, and the micropores are intercalcite intergranular micropores distributed inside the algal debris.Its formation may be controlled by recrystallization and evolution of original organic matter.In the upper member of Yijianfang formation, the pores of bio-bonded rock (represented by Shunto 1 well) are the mold pore of biological shell, the intergranular pore of silica sphere and self-shaped calcite aggregate is the main type, and the micropore is mainly micropore of biological cavity.Intergranular micropores formed by recrystallization of calcite and micropores on the surface of self-shaped quartz in limestone matrix.The transformation of hydrothermal fluid in the early diagenetic stage may be the main origin of the pores and micropores in bioadhesive rock of well Shunto 1. The early filling of liquid hydrocarbons is of great significance to the preservation of pores and micropores.The results show that the pore-micropore development characteristics and genesis of limestone with different drilling structure are different, which leads to the difference of controlling factors of limestone reservoir development and distribution.
【作者单位】：南京大学地球科学与工程学院;中国石化石油勘探开发研究院无锡石油地质研究所;中国石化西北油田分公司勘探开发研究院;中国石化石油勘探开发研究院;
【基金】：国家重点基础研究发展计划(973计划)项目(2012CB214802) 中国石化科技开发部项目(P13069,P16112)
【分类号】：P618.13

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