Analysis on Controlling Factors and Characteristics of Sandstone Reservoir of He 8 (Upper Paleozoic) in the Northern Ordos Basin
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摘要: 通过研究区内大量铸体薄片及物性资料的分析，对鄂尔多斯盆地北部盒8气层组储层的岩石学特征、孔渗特征、孔隙结构及孔隙类型等进行深入研究，分析了影响储层储集性能的主要因素。研究表明，以辫状河沉积为主的盒8储集层具成分成熟度高而结构成熟度中等的岩石学特点，储层以次生溶孔和高岭石晶间孔最为发育，微孔—中孔是主要的油气储集空间，微喉和细喉是盒8的基本渗流通道，为典型的中低孔、特低渗储层。平面上储层物性受物源、沉积相带的控制，垂向上压实和胶结作用使储层物性明显变差，溶蚀作用产生的次生孔隙使储层物性得到改善。Abstract: By analyzing the thin sections and physical property,the petrology character, poroperm characteristics, pore texture and pore types of the reservoir of the He 8 Formation in the north of Ordos basin were tested, and the reservoir performance’ major influencing factor were analyzed. The result indicates that the reservoir of He 8 Formation which deposited in braidedstream have high compositional maturity and media textural maturity, the reservoir germinates secondary corroded pore and kaolinite intercrystalline pore primarily, microporetransitional pore was primary oil gas reservoir space, the micro larynx and thinness larynx were the basic seepage passage, and it is typical medialow hole, special hypotonic reservoir. In plan, the reservoir's physical property is controlled by provenance and sedimentary facies zone. In vertical directions, the compaction and cementation lead poov reservoir’s physical property, whereas secondary pores produced by dissolution result in the enhancement of reservoir property.
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Key words:
- reservoir characterization /
- controlling factor /
- He 8 Formation /
- Ordos Basin
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