低渗透砂砾岩储层不同孔隙类型下的水驱油特征——以二连盆地阿尔凹陷腾一下段储层为例
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摘要
以二连盆地阿尔凹陷腾一下段储层低渗透砂砾岩储层为例,利用铸体薄片、扫描电镜、高压压汞、恒速压汞、核磁共振、油水相渗实验等测试方法,对研究例区不同孔隙类型下的水驱油特征进行探讨。结果表明,阿尔凹陷腾一下段储层孔隙类型以粒间孔、长石溶孔为主;排驱压力小于1 MPa,孔隙组合类型为溶孔-粒间孔型,T2谱形态为左低右高峰,水驱效率为67. 8%;排驱压力介于1～2 MPa,孔隙组合类型粒间孔-溶孔型,T2谱形态为左高右低峰,水驱效率为49. 7%;排驱压力大于2 MPa,孔隙组合类型晶间孔-溶孔型,T2谱形态为单峰状,水驱效率为35. 8%。研究后认为,研究区不同孔隙类型的储集能力及水驱油特征差异明显,其影响因素主要为渗透率、喉道分布、孔喉比、分选系数、黏土矿物含量。当渗透率小于3×10~(-3)μm~2,喉道半径小于2μm时,储层水驱油效率受渗透率、喉道半径控制明显。
The heterogeneity of the micro-pore structure of low-permeability glutenite reservoirs restricts the efficient development of reservoirs. This paper takes the low-permeability glutenite reservoir of the Tengcai section of the Alzhao basin in the Erlian Basin as an example,using cast thin sheets and scanning electron microscopy. The high-pressure mercury,constant-pressure mercury,nuclear magnetic resonance,oil-water phase infiltration experiments and other test methods,the characteristics of water flooding under different pore types in the study area. The results show that the pore type of the reservoir in the sag of the Al sag is domina-ted by intergranular pores and feldspar dissolved pores; the displacement pressure is less than 1 MPa,the pore combination type is dissolved pore-intergranular pore type,and the T2 spectrum is left low right peak. The water flooding efficiency is 67. 8%; the displacement pressure is between 1 and 2 MPa,the pore combination type is intergranular pore-dissolved pore type,the T2 spectrum is left high right and low peak,the water flooding efficiency is 49. 7%; 2 MPa,pore combination type intercrystalline pore-dissolved pore type,the T2 spectrum is monomodal,and the water flooding efficiency is 35. 8%. After the study,it is believed that the reservoir capacity and water flooding characteristics of different pore types in the study area are significantly different. The main influencing factors are permeability,throat distribution,pore throat ratio,sorting coefficient and clay mineral content. When the permeability is less than 3 × 10~(-3)μm~2 and the throat radius is less than 2μm,the reservoir water flooding efficiency is controlled by the permeability and throat radius.
The heterogeneity of the micro-pore structure of low-permeability glutenite reservoirs restricts the efficient development of reservoirs. This paper takes the low-permeability glutenite reservoir of the Tengcai section of the Alzhao basin in the Erlian Basin as an example,using cast thin sheets and scanning electron microscopy. The high-pressure mercury,constant-pressure mercury,nuclear magnetic resonance,oil-water phase infiltration experiments and other test methods,the characteristics of water flooding under different pore types in the study area. The results show that the pore type of the reservoir in the sag of the Al sag is domina-ted by intergranular pores and feldspar dissolved pores; the displacement pressure is less than 1 MPa,the pore combination type is dissolved pore-intergranular pore type,and the T2 spectrum is left low right peak. The water flooding efficiency is 67. 8%; the displacement pressure is between 1 and 2 MPa,the pore combination type is intergranular pore-dissolved pore type,the T2 spectrum is left high right and low peak,the water flooding efficiency is 49. 7%; 2 MPa,pore combination type intercrystalline pore-dissolved pore type,the T2 spectrum is monomodal,and the water flooding efficiency is 35. 8%. After the study,it is believed that the reservoir capacity and water flooding characteristics of different pore types in the study area are significantly different. The main influencing factors are permeability,throat distribution,pore throat ratio,sorting coefficient and clay mineral content. When the permeability is less than 3 × 10~(-3)μm~2 and the throat radius is less than 2μm,the reservoir water flooding efficiency is controlled by the permeability and throat radius.
引文
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[15]胡小冬,吕建荣,程宏杰,等.砾岩油藏微观结构对聚驱后剩余油影响研究[J].新疆石油天然气,2014,10(3):52-56.
[2]赵贤正,史原鹏,降栓奇,等.二连盆地阿尔凹陷科学、快速、高效勘探实践和认识[J].中国石油勘探,2010,15(1):1-5.
[3]张久强,张娥,梁官忠,等.二连盆地阿尔凹陷快速评价成效与启示[J].中国石油勘探,2013,18(6):13-17.
[4]赵贤正,降栓奇,淡伟宁,等.二连盆地阿尔凹陷石油地质特征研究[J].岩性油气藏,2010,22(1):12-17.
[5]肖阳,唐谨,孙朝辉,等.二连盆地阿尔凹陷油气成藏条件及油藏类型[J].中国石油勘探,2010,15(6):41-44.
[6]张旭阳,杨青,侯文峰,等.不同孔隙结构砂砾岩储层水驱油效率评价[J].重庆科技学院学报(自然科学版),2011,12(13):47-50.
[7]段宝江,熊伟,高树生,等.砾岩储层不同润湿性水驱油微观仿真实验研究[J].科学技术与工程,2012; 12(36):9928-932.
[8]吕建荣,谭锋奇,许长福,等.克拉玛依砾岩油藏储层分类特征及水驱油规律[J].东北石油大学学报,2015,39(4):21-30.
[9]苟燕,高树生,彭永灿,等.新疆莫北油田水驱油机理与采出程度分析[J].大庆石油地质与开发,2013,32(3):74-78.
[10]刘卫,肖忠祥,杨思玉,等.利用核磁共振(NMR)测井资料评价储层孔隙结构方法的对比研究[J].石油地球物理勘探,2009,44(6):773-778.
[11]李海波,郭和坤,刘强,等.致密油储层水驱油核磁共振实验研究[J].中南大学学报(自然科学版),2014,45(12):4370-4376.
[12]曾大乾,李淑贞.中国低渗透砂岩储层类型及地质特征[J].石油学报,1994,15(1):38-45.
[13]杨正明,张英芝,郝明强,等.低渗透油田储层综合评价方法[J].石油学报,2006,27(2):64-67.
[14]罗明高,张庭辉.克拉玛依砾岩油藏微观孔隙结构及分类[J].石油与天然气地质,1992,13(2):201-210.
[15]胡小冬,吕建荣,程宏杰,等.砾岩油藏微观结构对聚驱后剩余油影响研究[J].新疆石油天然气,2014,10(3):52-56.