扎哈泉X井区下油砂山组碎屑岩储层特征及其影响因素分析
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摘要
在根据岩石薄片、铸体薄片、扫描电镜、压汞等分析测试技术,对扎哈泉X井区下油砂山组碎屑岩储层特征以及影响因素进行综合分析。分析结果表明:X井区下油砂山组储层岩石类型为长石质岩屑砂岩及少量的岩屑质长石砂岩;对储层影响较大的成岩作用为压实作用,其次是胶结作用和溶蚀作用;储层孔隙类型以原生孔隙为主,其次是次生孔隙;储层属于中孔中低渗储层;沉积作用、成岩作用和孔隙结构是影响研究区储层物性的主要因素;其中优势储集砂体为滨浅湖的坝砂和滩砂;胶结作用对储层物性影响较大;孔隙结构对储层物性影响明显。
Based on the analysis and testing techniques of rock slice, casting slice, scanning electron microscopy and mercury injection, the characteristics and influencing factors of clastic rock reservoir of lower Youshashan formation in Zhahaquan X well area were comprehensively analyzed. The analysis results show that the reservoir rock types of lower Youshashan formation in well X area are feldspathic lithic sandstone and a small amount of lithic feldspathic sandstone; the diagenesis which has great influence on the reservoir is compaction, followed by cementation and dissolution; the reservoir pore type is primary pore, followed by secondary pore;the reservoir belongs to medium-pore and low-permeability reservoir; the sedimentation, diagenesis and pore structure are the main factors affecting reservoir physical properties in the study area. The superior reservoir sand body is the dam sand and beach sand of the shore shallow lake. The cementation has also great influence on reservoir physical properties.
Based on the analysis and testing techniques of rock slice, casting slice, scanning electron microscopy and mercury injection, the characteristics and influencing factors of clastic rock reservoir of lower Youshashan formation in Zhahaquan X well area were comprehensively analyzed. The analysis results show that the reservoir rock types of lower Youshashan formation in well X area are feldspathic lithic sandstone and a small amount of lithic feldspathic sandstone; the diagenesis which has great influence on the reservoir is compaction, followed by cementation and dissolution; the reservoir pore type is primary pore, followed by secondary pore;the reservoir belongs to medium-pore and low-permeability reservoir; the sedimentation, diagenesis and pore structure are the main factors affecting reservoir physical properties in the study area. The superior reservoir sand body is the dam sand and beach sand of the shore shallow lake. The cementation has also great influence on reservoir physical properties.
引文
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[3]苗军.柴达木盆地第三纪湖盆古水介质研究[J].西安石油学院学报(自然科学版),2000(04):22-24+4.
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[5]Shou Jianfeng,Si Chunsong,WangXin.Genesis types and disgenesis compaction mechanisms of sandstone reservoirs in dynamic environments in Oil/Gas Basins in China[J].Petroleum Science,2006,3(3):23-31.
[6]杨永剑,刘家铎,孟万斌,等.柴达木盆地北缘潜西地区古近系储层发育特征及主控因素[J].岩性油气藏,2010,22(增刊):63-64.
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