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首页> 外文期刊>Marine and Petroleum Geology >The diagenetic controls of the reservoir heterogeneity in the tight sand gas reservoirs of the Zizhou Area in China's east Ordos Basin: Implications for reservoir quality predictions
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The diagenetic controls of the reservoir heterogeneity in the tight sand gas reservoirs of the Zizhou Area in China's east Ordos Basin: Implications for reservoir quality predictions

机译：中国东部鄂尔多斯盆地宗州地区紧密砂煤气藏的储层异质性的成岩控制：储层质量预测的含义

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摘要

The Shan 2(3) sandstone formations are important exploratory targets for tight gas resources in the Zizhou Area of the Ordos Basin. In this study, we investigated the effects of diagenesis on the heterogeneity of tight sandstone deposits in similar sedimentary facies and identified the main controlling factors of reservoir quality. A total of 169 samples were collected from 50 wells for a series of analyses. The heterogeneity of the sandstones is mainly controlled by cement and pore-throat characteristics, which showed regional differences in the study area consistent with the regional variations in the detrital components. These results indicate that the diagenesis influenced by the sediment composition is the main controlling factor of the reservoir heterogeneity. The compaction dominated by ductile grains is the major cause of the primary porosity losses in the sandstones, followed by the quartz and clay (kaolinite and illite) cementation. Residual intergranular pores rarely occur in the sandstones with a ductile lithic grain content greater than 2%. Altered kaolinite and recrystallized illite commonly occur in the sandstones with high ductile grain content. Residual intergranular pores, quartz over-growths, and authigenic kaolinite are the most common phases in the sandstones rich in detrital quartz. The dissolution formed secondary pores and provided a minor contribution to reservoirs permeability. Secondary pores predominantly occur in the quartz arenite due to the preservation of the primary pores.
机译：山2（3）砂岩地层是鄂尔多斯盆地宗州地区的紧汽资源的重要探索性目标。在这项研究中，我们研究了成岩作用对类似沉积相中紧密砂岩沉积物的异质性的影响，并确定了水库质量的主要控制因素。从50个孔中收集总共169个样品进行一系列分析。砂岩的异质性主要受水泥和孔隙特征来控制，这在研究区域的区域差异均呈牵引部件的区域变异。这些结果表明，受沉积物组合物影响的成岩作用是储层异质性的主要控制因子。延展性颗粒主导的压实是砂岩中主要孔隙率损失的主要原因，其次是石英和粘土（高岭土和伊利钠）胶结。残留的晶体孔隙很少发生在砂岩中，延展岩晶粒含量大于2％。改变的高岭石和重结晶的伊尔石通常发生在具有高延性籽粒含量的砂岩中。残留的晶状体孔隙，石英过度生长和Aheyigenic Koolinite是富含碎石石英的砂岩中最常见的阶段。溶解形成二次孔，并为储层渗透性提供了微小的贡献。由于保存原发性孔，次要孔主要发生在石英恒星中。

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