Research on the Reservoir Characteristics and Controlling Factors of the Changxing Formation Reef in Yuanba Gas Field of Sichuan Basin,China
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摘要: 通过岩心观察、铸体薄片鉴定、扫描电镜以及物性测试分析，可知长兴组储集岩的主要岩石类型为晶粒白云岩、生屑白云岩、生物礁白云岩；主要储集空间类型为晶间孔、晶间溶孔、粒间溶孔及裂缝；喉道类型主要为片状、孔隙缩小型、缩颈型喉道。储层的发育主要受控于沉积相、白云岩化及溶蚀作用，储层主要发育于生物礁礁盖的潮坪及浅滩环境，主要分布于研究区东部长兴组上段的晚期浅滩和西部的礁盖中。Abstract: On the basis of core observation,identification of thin casting section,scanning electron microscopy and physical test and analysis,it is found that the reservoir rocks in Changxing Formation are mainly composed of grain dolostones, bioclast dolostone and reef dolomite.Types of the reservoir space are mainly the intracrystalline pore,the intercrystalline denudation pore,the dissolved pores in grains and the fractures.And the throat types are mainly slice-shape,pore-shrinking and the contracted neck throat.The reservoirs were mainly developed in the reef cap of the western part of the studied area and the shoal in upper Changxing Formation of the eastern part,dominated by sedimentary facies,corrosion and dolomitization.
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Key words:
- Yuanba gas field /
- Changxing Formation /
- reef /
- diagenesis model of dolomite /
- reservoir evaluation
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