鄂尔多斯盆地富-黄地区延长组储层特征及物性影响因素分析
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摘要
笔者利用岩石薄片、铸体薄片、压汞和物性等资料,对富—黄地区延长组储层特征进行了深入研究,多角度分析影响富—黄地区储层物性的因素。研究表明,研究区沉积岩石类型主要为长石砂岩,填隙物为杂基和胶结物,杂基含量偏少,以水云母为主;胶结物含量偏高,其中方解石含量最高,硬石膏含量最低;孔隙类型以粒间孔和溶蚀孔为主;喉道偏细,表现为微细吼道和微吼道;储层物性较差,为低孔、低渗-超低渗储层,储集空间以孔隙为主;研究区沉积微相中分流河道物性最好,河口坝、席状砂其次,浊积扇最差。综合研究认为,压实作用和胶结作用是富—黄地区延长组储层形成特低孔渗储层的最主要原因。
In this paper,the reservoir characteristics of the Yanchang Formation in the FuxianHuangling area have been studied in detail using the data of rock thin sections,cast thin sections,mercury intrusion and physical properties,and the affecting factors of the reservoir properties in this area have been analyzed in multiple perspectives.The results show that the sedimentary rock types in the study area are mainly feldspar sandstones,the interstitial materials are heterogeneous and cement,the hetero-base is mainly hydromica with less content;The cement has high content,in which the calcite has highest content,and the anhydrite has least content.The pore type is mainly composed of intergranular pores and dissolution pores;The throat is fine,which is characterized by fine tunnels and microchannels;The reservoir properties are poor,and they are low porosity,low permeability-ultra-low permeability reservoirs,with main reservoir space of pores;The best physical properties in this study area are sedimentary microfacies,the second ones are estuary dam and mat sand,and the worst one is turbidite fan.Finally,it is concluded that the compaction and cementation are the most important reason for forming the ultra-low porosity reservoirs of the Yanchang Formation reservoirs in the Fuxian-Huangling area.
In this paper,the reservoir characteristics of the Yanchang Formation in the FuxianHuangling area have been studied in detail using the data of rock thin sections,cast thin sections,mercury intrusion and physical properties,and the affecting factors of the reservoir properties in this area have been analyzed in multiple perspectives.The results show that the sedimentary rock types in the study area are mainly feldspar sandstones,the interstitial materials are heterogeneous and cement,the hetero-base is mainly hydromica with less content;The cement has high content,in which the calcite has highest content,and the anhydrite has least content.The pore type is mainly composed of intergranular pores and dissolution pores;The throat is fine,which is characterized by fine tunnels and microchannels;The reservoir properties are poor,and they are low porosity,low permeability-ultra-low permeability reservoirs,with main reservoir space of pores;The best physical properties in this study area are sedimentary microfacies,the second ones are estuary dam and mat sand,and the worst one is turbidite fan.Finally,it is concluded that the compaction and cementation are the most important reason for forming the ultra-low porosity reservoirs of the Yanchang Formation reservoirs in the Fuxian-Huangling area.
引文
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