鄂尔多斯寨科区及旦八北部区储层特征研究
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摘要
寨科区和旦八北部区面积约82km2。通过大量资料统计分析,该区域长4+5、长6储层主要为细砂岩,孔隙度一般4.7%~18.4%,平均10.93%,渗透率0.042~12.2×10-3μm2,平均1.64×10-3μm2,长6储层孔渗条件比长4+5略好。对储集性能起破坏性的成岩作用主要包括压实作用和胶结作用,起建设性作用的主要为溶解作用。粘土膜可以有效阻止石英次生加大以及其他矿物的胶结作用,从而有保护残余粒间孔,但是孔隙式充填的自生粘土矿物常常挤占有效孔隙空间,降低储集层的物性。
Statistical analysis indicates that reservoirs of the Chang4 + 5 and Chang 6 in the Zhaike and Northern Danba areas in Ordos Basin are composed gray and grayish white, brown fine sandstone with a porosity of 4.7-18.4%(average of10.93%) and a permeability of 0.042-12.2×10-3μm2(average of 1.64×10-3μm2). And pore and permeable condition of the Chang 6 reservoir is better than that of Chang 4 + 5. The reservoir space types are residual original intergranular pore, intergranular dissolved pore, intragranular dissolved pore, matrix pore and so on. Pore structure includes the necking throat, flake or curved flake throat, tube bundle throat, dot throat. Compaction and cementation are destructive diagenesis on physical properties, while dissolution is a constructive one. Clay film can effectively prevent quartz overgrowth which protected the residual intergranular pore formation, but the pore filled by antigenic clay minerals often diverted effective pore space, reducing the physical properties of the reservoir.
Statistical analysis indicates that reservoirs of the Chang4 + 5 and Chang 6 in the Zhaike and Northern Danba areas in Ordos Basin are composed gray and grayish white, brown fine sandstone with a porosity of 4.7-18.4%(average of10.93%) and a permeability of 0.042-12.2×10-3μm2(average of 1.64×10-3μm2). And pore and permeable condition of the Chang 6 reservoir is better than that of Chang 4 + 5. The reservoir space types are residual original intergranular pore, intergranular dissolved pore, intragranular dissolved pore, matrix pore and so on. Pore structure includes the necking throat, flake or curved flake throat, tube bundle throat, dot throat. Compaction and cementation are destructive diagenesis on physical properties, while dissolution is a constructive one. Clay film can effectively prevent quartz overgrowth which protected the residual intergranular pore formation, but the pore filled by antigenic clay minerals often diverted effective pore space, reducing the physical properties of the reservoir.
引文
[1]曾允孚,夏文杰.沉积岩石学[M].成都:成都理工大学出版社,1980,40~60.
[2]武富礼,李文厚,李玉宏,等.鄂尔多斯盆地上二叠统延长组三角洲沉积及演化[J].古地理学报,2004,6(3):307~315.
[3]高占虎.定边油田樊学油区延安组延9储层特征研究[J].内蒙古石油化工,2012(17),125~129.
[4]王峰.鄂尔多斯盆地三叠系延长组沉积、层序演化及岩性油藏特征研究[D].成都理工大学博士学位论文,2007,8~13.
[5]窦伟坦.鄂尔多斯盆地三叠系延长组沉积体系一储层特征及油藏成藏条件研究[D].成都理工大学博士学位论文,2005,43~51.
[6]朱国华.成岩作用与砂岩层孔隙演化[J].石油与天然气地质,1980,3(3):199~201.
[7]A.Park,沉积物的成岩作用[M].北京:中国地质大学出版社,1989,47~48.
[8]朱平,黄思静,李德敏,等.粘土矿物绿泥石对碎屑储集岩孔隙的保护[J].成都理工大学学报(自然科学版),2004,31(2):153~156.
[2]武富礼,李文厚,李玉宏,等.鄂尔多斯盆地上二叠统延长组三角洲沉积及演化[J].古地理学报,2004,6(3):307~315.
[3]高占虎.定边油田樊学油区延安组延9储层特征研究[J].内蒙古石油化工,2012(17),125~129.
[4]王峰.鄂尔多斯盆地三叠系延长组沉积、层序演化及岩性油藏特征研究[D].成都理工大学博士学位论文,2007,8~13.
[5]窦伟坦.鄂尔多斯盆地三叠系延长组沉积体系一储层特征及油藏成藏条件研究[D].成都理工大学博士学位论文,2005,43~51.
[6]朱国华.成岩作用与砂岩层孔隙演化[J].石油与天然气地质,1980,3(3):199~201.
[7]A.Park,沉积物的成岩作用[M].北京:中国地质大学出版社,1989,47~48.
[8]朱平,黄思静,李德敏,等.粘土矿物绿泥石对碎屑储集岩孔隙的保护[J].成都理工大学学报(自然科学版),2004,31(2):153~156.