鄂尔多斯盆地靖边气田陕200井区马五2储层特征

目的对鄂尔多斯盆地靖边气田陕200井区马五21、马五22储层差异性进行对比分析。方法在研究区评价井、探井、生产井动态资料解释和前人研究工作的基础上,通过岩心观察、薄片分析、岩电解释的方法剖析差异性及其控制因素。结果马五21沉积时水体较深,沉积微相以云坪为主,但泥质含量较高,含膏云坪微相不发育;马五22沉积时水体较浅,含膏云坪微相很发育;马五21由于受泥质含量高和古沟槽携带上覆地层沉积物充填的不利影响,以破坏性成岩作用为主,孔隙和裂缝被严重充填;马五22古沟槽的发育过程对储层有建设性意义,溶蚀作用强烈,溶孔、微裂缝发育。结论沉积-成岩作用是两个储层产生差异的根本原因,马五21孔隙组合类型主要为孔-缝型和孔隙型,气层零星分布;马五22孔隙组合类型主要为孔-缝-洞型和孔-缝型,天然气富集,气层连片发育且厚度较大。

Characteristics of M 52 gas reservoir in Shaan 200 borefild of Jingbian Gas Field, Ordos Basin

Aim The multidisciplinary analysis on the differential research of M5 2 1 and M5 2 2 reservoir in Shaan 200 borefild of Jingbian Gas Field in Ordos Basin.Methods Relying on dynamic data of exploration wells,producible wells,appraisal wells and predecessors' research,the methods of core observation,thin section analysis,lithology-electric property interpretation were used to multidisciplinarily analyse the characteristics and contributing factor of on reservoir.Results M5 2 1 which is deposited in the deep water have higher content of muddy and the precipitation facie is mainly dolomite tidal flat,but that of M5 2 1 is mainly sekkoko dolomite tidal flat.The ancient valley-troughs carried muddy and deposit of overlying formations harmfully filling M5 2 1 so that the diagenesis havoc reservoir rocks.The cavalcade of the ancient valley-troughs in M5 2 2 benefit for reservoir rocks so that denudation increased a lot of corroded hollows and fractures.Conclusion The hydrocarbon pore volume of M5 2 1 is limitted and gas areas are very small,but in M5 2 2 the hydrocarbon pore volume is vegetal and thick gas bearing formations are much more,so M5 2 2 is good quality reservoir.