白马崾岘康粱区块延长组长6～长8储层非均质性研究
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摘要
康粱区延长组长6～长8段储层具有较强的非均质性,对油藏注水开发效果产生不利影响。研究结果表明,长6～长8段储层有效孔隙度平均值为8.74%;相对高产的"甜点"区块有效储层平均渗透率均值为0.41mD,属于特低孔-特低渗储层;研究区长61亚段发育泥质与钙质夹层,长71段发育泥质、粉砂质夹层,含少量钙质夹层,长8段发育泥质夹层、钙质夹层。各小段较多夹层在一定程度上加大了储层内部的分隔性,对洗油十分不利。各小段内储层之间还发育1～3层泥质或粉砂质隔层,可作为注水层系划分的依据。长6～长8段储层非均质性程度强,该特征在注水开发中易形成水进或水淹。
The Chang 6～8 sections of Yanchang Formation in Kangliang area have a strong heterogeneity,which is unfavorable to water flooding.The researches show that the average effective porosity of the Chang 6～8 reservoir is 8.74%;the average effective permeability of the relatively high-product "sweet spot" block is 0.41 mD,which belongs to the ultra-low porosity and ultra-low permeability reservoir.The Chang 61 sub-section of the study area developed argillaceous and calcareous intercalations,Chang 71 sub-section developed argillaceous and silty sand intercalations,containing a small amount of calcareous interlayers,and Chang 8 sub-section developed argillaceous and calcareous intercalations.The exist of these small layers in each section increase the separation from the internal of the formation in some level,which is very unfavorable for water flooding.Within each small section,1 to 3 thicker layers of argillaceous or silty sand interlayers are also developed,which can be used as the basis for the division of water injection layers.The Chang 6～8 sections has a strong degree of heterogeneity,and this feature is easy to form fingering or flooding during water-flood development.
The Chang 6～8 sections of Yanchang Formation in Kangliang area have a strong heterogeneity,which is unfavorable to water flooding.The researches show that the average effective porosity of the Chang 6～8 reservoir is 8.74%;the average effective permeability of the relatively high-product "sweet spot" block is 0.41 mD,which belongs to the ultra-low porosity and ultra-low permeability reservoir.The Chang 61 sub-section of the study area developed argillaceous and calcareous intercalations,Chang 71 sub-section developed argillaceous and silty sand intercalations,containing a small amount of calcareous interlayers,and Chang 8 sub-section developed argillaceous and calcareous intercalations.The exist of these small layers in each section increase the separation from the internal of the formation in some level,which is very unfavorable for water flooding.Within each small section,1 to 3 thicker layers of argillaceous or silty sand interlayers are also developed,which can be used as the basis for the division of water injection layers.The Chang 6～8 sections has a strong degree of heterogeneity,and this feature is easy to form fingering or flooding during water-flood development.
引文
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[3]陈博,屈彦虎,燕海洲.定边地区长8_2储层微观渗流特征研究[J].化工管理,2014(27):156.
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[5]李凤杰,蒋斌,赵俊兴.鄂尔多斯坳陷湖盆缓坡型三角洲前缘沉积微相分带及成因分析———以定边-安边地区延长组长6油组为例[J].矿物岩石,2008(3):111-117.
[6]韩永林,王成玉,王海红,等.姬塬地区长8油层组浅水三角洲沉积特征[J].沉积学报,2009(6):1057-1064.
[7]赵靖舟,武富礼,闫世可,等.陕北斜坡东部三叠系油气富集规律研究[J].石油学报,2006(5):24-27.
[8]王变阳,贺永红,王康乐,等.鄂尔多斯盆地定边—安塞地区延长组下组合储层特征[J].岩性油气藏,2014(6):64-68.
[9]吴保祥,段毅,郑朝阳,等.鄂尔多斯盆地中生界油藏连通性特征研究———以定边—安边以南地区为例[J].地球学报,2008(5):628-632.
[10]于波.吴起、定边地区上三叠统延长组长7—长9储层特征研究[J].岩性油气藏,2011(5):16-20.
[11]曹翠.胜坨油田一区沙二段储层夹层定量表征[D].北京:中国石油大学,2010.
[12]程启贵,陈恭洋.低渗透砂岩油藏精细描述与开发评价技术[M].北京:石油工业出版社,2010.