鄂尔多斯盆地中部气田奥陶系马五_（1－4）碳酸盐岩微相特征与储层不均质性研究  

Carbonate Microfacies Characteristics and Reservoir Heterogeneity of the Ordovician Weathering Crust(O_(1ma5)_(1-4)) of the Zhongbu Gasfield,Ordos Basin, Northwest China

作　　者：马永生[1] 李启明[1] 关德师[1] 

机构地区：[1]石油勘探开发科学研究院

出　　处：《沉积学报》1996年第1期22-32,共11页Acta Sedimentologica Sinica

摘　　要：奥陶系顶部风化壳（马五１－４）是鄂尔多斯盆地中部气田主力产气段，根据这套地层的岩石矿物、结构、地化等特征共划分了２４个微相及８个微相组合，而不同微相或微相组合控制了岩层孔隙空间发育程度，导致该区储集性能纵横向的不均质性。the Ordovician weathering crust (O1ma51-4)is a major gas-bearing stratum of the Zhongbu gasfield in central Ordos Basin. 24 types of microfacies with different and abundant pores have respectively been recognized according to their mineral,texture,structure, diagenesis, geochemistry and petrophysics features. They were genetically reorganized into 8 MF associations. The table (below) shows the main characters of the MF associations.The main factors which control the characteristics of the reservoir are distribution character of the sedimentary factes (belts) and their MF associations, diagenesis, succeeding tification and tectonic movement.Sedimentary factes and their MF associations are the basic controlling factors. They control the regional strike and general distribution of the reservoir. The MF associations are the material foundation of the succeeding processes, which have direct strategic significance in guiding the petroleum exploration. The microfacies study results indicate that, for one thing the difference between the MF associations leads to the reservoir heterogeneity and, for another,the favourable microfacies have a very high proportion vertically in every well district and good continuity laterally, esp. in each section of O1ma51,the porportion of the narrowly distributed unfavourable micro factes is very low. The succeeding processes(including diagenesis,karstification and tectonic movement) determine the specific distribution patterns of the effective pore space and fvourable reservoir bodies, which has the most actual significance in directing the development.

关 键 词：气田 碳酸盐岩 微相 储集层 不均质性 

分 类 号：P618.130.2[天文地球—矿床学]