鄂尔多斯盆地马岭地区长8_1储层物性控制因素
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摘要
鄂尔多斯盆地马岭地区为三角洲前缘沉积,长81油层属于低渗透、特低渗透、超低渗透致密砂岩油藏.综合铸体薄片、扫描电镜、物性等试验资料,深化认识马岭地区长81储层特征及物性影响因素,通过沉积作用及成岩作用的研究发现:马岭油田长81储层砂岩以岩屑长石质砂岩为主,成分成熟度中等偏低.沉积作用及成岩作用是影响储层物性的主要因素,物性差异与沉积微相及砂体展布方向一致,水下分流河道的物性最好;,压实残损孔隙平均为22. 2%,胶结孔隙度残损平均5. 0%,次生溶蚀孔隙度增加平均为4. 8%,胶结孔隙度残损平均值7. 7%,最终计算孔隙平均为8. 3%,成岩作用中的压实作用对本区的物性影响较大.
Maling area of Ordos Basin is a delta front deposit.Chang 81 reservoir belongs to low permeability,ultra-low permeability and ultra-low permeability tight sandstone reservoir.Based on the experimental data of casting thin section,scanning electron microscopy and physical properties,the characteristics of Chang 81 reservoir in Maling area and the influencing factors of physical properties are further understood.The following conclusions are drawn from the study of sedimentation and diagenesis.The sandstone of Chang 81 reservoir in Maling oilfield is mainly composed of lithic feldspathic sandstone with low maturity.Sedimentation and diagenesis are the main factors affecting reservoir physical properties.The differences of physical properties are consistent with the distribution direction of sedimentary microfacies and sand body,and the physical properties of underwater distributary channel are the best.The average of compacted and damaged pore is 22.2%,cemented porosity is 5.0%,secondary dissolution porosity is 4.8%,cemented porosity is 7.7%,and finally calculated pore is 8.3%.The compaction in diagenesis has a great influence on the physical properties of this area.
Maling area of Ordos Basin is a delta front deposit.Chang 81 reservoir belongs to low permeability,ultra-low permeability and ultra-low permeability tight sandstone reservoir.Based on the experimental data of casting thin section,scanning electron microscopy and physical properties,the characteristics of Chang 81 reservoir in Maling area and the influencing factors of physical properties are further understood.The following conclusions are drawn from the study of sedimentation and diagenesis.The sandstone of Chang 81 reservoir in Maling oilfield is mainly composed of lithic feldspathic sandstone with low maturity.Sedimentation and diagenesis are the main factors affecting reservoir physical properties.The differences of physical properties are consistent with the distribution direction of sedimentary microfacies and sand body,and the physical properties of underwater distributary channel are the best.The average of compacted and damaged pore is 22.2%,cemented porosity is 5.0%,secondary dissolution porosity is 4.8%,cemented porosity is 7.7%,and finally calculated pore is 8.3%.The compaction in diagenesis has a great influence on the physical properties of this area.
引文
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[6]唐俊,王琪,廖朋,等.鄂尔多斯盆地环县地区长8段砂岩储层孔隙度演化定量模拟[J].兰州大学学报(自然科学版),2013,49(3):320-326,331.
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[10]李红,柳益群,刘林玉.鄂尔多斯盆地西峰油田延长组长81低渗透储层成岩作用[J].石油与天然气地质,2006,27(2):209-217.
[11]师调调,孙卫,何生平.华庆地区延长组长6储层不同类型成岩相微观孔隙结构特征及生产动态[J].兰州大学学报(自然科学版),2012,48(3):7-13.
[12]陈大友,朱玉双,张皎生.鄂尔多斯盆地马岭地区长8储层成岩作用与有利成岩相带[J].石油实验地质,2015,37(6):721-728.
[13]张茜,孙卫,杨晓菁,等.致密砂岩储层差异性成岩演化对孔隙度演化定量表征的影响-以鄂尔多斯盆地华庆地区长63储层为例[J].石油实验地质,2017,39(1):126-133.
[14]姚泾利,唐俊,庞国印.鄂尔多斯盆地白豹-华池地区长8段孔隙度演化定量模拟[J].天然气地球科学,2013,24(1):38-46.
[15]张创,孙卫,高辉.基于铸体薄片资料的砂岩储层孔隙度演化定量计算方法:以鄂尔多斯盆地环江地区长8储层为例[J].沉积学报,2014,32(2):365-375.
[2]任大忠,孙卫,雷启鸿,等.鄂尔多斯盆地华庆油田长81段储层物性影响因素[J].地质与勘探,2014,50(3):591-598.
[3]任大忠,孙卫,屈雪峰,等.鄂尔多斯盆地延长组长6储层成岩作用特征及孔隙度致密演化[J].中南大学学报(自然科学版),2016,47(8):2706-2714.
[4]钟大康,朱筱敏,张枝焕,等.东营凹陷古近系砂岩储集层物性控制因素评价[J].石油勘探与开发,2003(3):95-98.
[5]吴小斌,侯加根,孙卫.特低渗砂岩储层微观结构及孔隙演化定量分析[J].中南大学学报(自然科学版),2011,42(11):3438-3446.
[6]唐俊,王琪,廖朋,等.鄂尔多斯盆地环县地区长8段砂岩储层孔隙度演化定量模拟[J].兰州大学学报(自然科学版),2013,49(3):320-326,331.
[7]盛军,孙卫,解腾云,等.苏里格气田东南部盒8段储层成岩作用研究及其孔隙演化模式定量分析[J].地质科技情报,2015,34(1):20-27.
[8]朱筱敏.沉积岩石学[M].北京:石油工业出版社,2008:137-151.
[9]张其超,王多云,李建霆,等.马岭-镇北地区长8段三角洲前缘砂体成因与岩性油气藏特征[J].天然气地球科学,2011,22(5):807-814.
[10]李红,柳益群,刘林玉.鄂尔多斯盆地西峰油田延长组长81低渗透储层成岩作用[J].石油与天然气地质,2006,27(2):209-217.
[11]师调调,孙卫,何生平.华庆地区延长组长6储层不同类型成岩相微观孔隙结构特征及生产动态[J].兰州大学学报(自然科学版),2012,48(3):7-13.
[12]陈大友,朱玉双,张皎生.鄂尔多斯盆地马岭地区长8储层成岩作用与有利成岩相带[J].石油实验地质,2015,37(6):721-728.
[13]张茜,孙卫,杨晓菁,等.致密砂岩储层差异性成岩演化对孔隙度演化定量表征的影响-以鄂尔多斯盆地华庆地区长63储层为例[J].石油实验地质,2017,39(1):126-133.
[14]姚泾利,唐俊,庞国印.鄂尔多斯盆地白豹-华池地区长8段孔隙度演化定量模拟[J].天然气地球科学,2013,24(1):38-46.
[15]张创,孙卫,高辉.基于铸体薄片资料的砂岩储层孔隙度演化定量计算方法:以鄂尔多斯盆地环江地区长8储层为例[J].沉积学报,2014,32(2):365-375.