环县-南梁地区三叠系长4+5砂岩成岩作用及对孔隙的影响
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摘要
运用测井资料分析、岩心观察、铸体薄片鉴定、扫描电镜、X-衍射、压汞测试等技术手段,对鄂尔多斯盆地环县-南梁地区三叠系延长组长4+5油层组储层成岩作用进行研究。结果表明:研究区长4+5储集砂体以长石砂岩和岩屑长石砂岩为主,处于中成岩阶段的B期;主要成岩作用类型包括压实作用、胶结作用、溶解作用及交代作用。其中,压实作用、胶结作用是原生孔隙度降低、物性变差的主要原因,分别使平均孔隙度减小17.9%及14.49%,而溶蚀作用可使平均孔隙度增加4.12%,对于砂岩储集性能的改善具明显作用。
The Physical Properties and diagenesis in Chang 4+5 reservoir of the Huanxian-Lanliang Area in Ordos Basin are studied by varied methods, including sandstone cast thin section, scanning electron microscopy, X-ray analysis,the pressure mercury analysis techniques. Feldspathic and lithic feldspathic sandstones are chiefrock types. The reservoir diagenesis reaches B-period of middle diagenesis stage. The main diagenetic types include compaction, cementation, dissolution and metasomatism, among them, compaction and cementation are the main reason for 17.9% and 14.49% of the average porosity decreases, secondary porosity formed by dissolution has improved sandstone reservoir performance significantly,and increase 4.12% in average porosity.
The Physical Properties and diagenesis in Chang 4+5 reservoir of the Huanxian-Lanliang Area in Ordos Basin are studied by varied methods, including sandstone cast thin section, scanning electron microscopy, X-ray analysis,the pressure mercury analysis techniques. Feldspathic and lithic feldspathic sandstones are chiefrock types. The reservoir diagenesis reaches B-period of middle diagenesis stage. The main diagenetic types include compaction, cementation, dissolution and metasomatism, among them, compaction and cementation are the main reason for 17.9% and 14.49% of the average porosity decreases, secondary porosity formed by dissolution has improved sandstone reservoir performance significantly,and increase 4.12% in average porosity.
引文
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[8]石油地质勘探专业标准化委员会.石油天然气行业标准:碎屑岩成岩阶段划分规范(SY/T5477-2003)[S].北京:石油工业出版社,2003.
[9]Beard D C,Weyl P K.Influence of texture on porosity and permeability of unconsolidated sand[J].AAPG Bulletin,1973,57(2):349-369.
[10]梁晓伟,高薇,王芳.特低渗透储集层成岩作用及孔隙演化定量表征——以鄂尔多斯盆地姬塬地区为例[J].新疆石油地质,2010,31(2):50-153.