塔里木盆地BK井区砂岩储层物性分布及孔隙结构特征研究
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摘要
通过铸体薄片、物性分析、常规压汞等实验方法,开展了塔里木盆地BK井区致密砂岩储层物性特征研究及储层微观孔隙结构评价,并分析了微观孔隙结构影响因素。结果表明:研究区岩性主要为中-细粒岩屑长石砂岩,变质岩屑为主要岩屑类型;平均孔隙度为6.47%,平均渗透率为0.69×10~(-3)μm~2,储层属于特低孔-超低渗透致密砂岩储层,孔渗相关性整体较好;基于毛管压力曲线参数及形态可将研究区储层孔隙结构类型分为四类,Ⅰ类至Ⅳ类孔隙结构依次变差,孔喉半径与物性参数、压力参数及均值参数均有良好的相关关系,表明孔渗、进汞压力及孔喉分选特征是影响研究区致密砂岩储层的重要参数。
By analyzing the casting sheet, physical analysis, conventional mercury and other experimental methods, the physical characteristics and micropore structure of dense sandstone reservoirs in BK well area of Tarim basin were studied,and the influence factors of micropore structure were analyzed.The results show that the lithology of the study area is mainly medium-fine grained lithic feldspar sandstone,and the main types of cuttings are metamorphic debris.The average porosity is 6.47 %,and the mean permeability is 0.69 ×10~(-3)μm~2,and the reservoir belongs to the low-permeability tight sandstone reservoir with low permeability,and the permeability correlation is better.Based on the parameters and shape of capillary pressure curve,the pore structure types of the reservoir are divided into four types,and the pore structures of class Ⅰ to Ⅳ are deteriorated in turn.And the pore throat radius has good correlation with physical parameters,pressure parameters and mean parameters,indicating that pore permeability,mercury intrusion and pore throat sorting are important parameters that affect the tight sandstone reservoir in the study area.
By analyzing the casting sheet, physical analysis, conventional mercury and other experimental methods, the physical characteristics and micropore structure of dense sandstone reservoirs in BK well area of Tarim basin were studied,and the influence factors of micropore structure were analyzed.The results show that the lithology of the study area is mainly medium-fine grained lithic feldspar sandstone,and the main types of cuttings are metamorphic debris.The average porosity is 6.47 %,and the mean permeability is 0.69 ×10~(-3)μm~2,and the reservoir belongs to the low-permeability tight sandstone reservoir with low permeability,and the permeability correlation is better.Based on the parameters and shape of capillary pressure curve,the pore structure types of the reservoir are divided into four types,and the pore structures of class Ⅰ to Ⅳ are deteriorated in turn.And the pore throat radius has good correlation with physical parameters,pressure parameters and mean parameters,indicating that pore permeability,mercury intrusion and pore throat sorting are important parameters that affect the tight sandstone reservoir in the study area.
引文
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[2]李霞,石玉江,王玲,等.致密砂岩气层测井识别与评价技术-以苏里格气田为例[J].天然气地球科学,2013,24(1):62-68.
[3]王伟力,高海仁.鄂尔多斯盆地中东部致密砂岩储层地质特征及控制因素[J].岩性油气藏,2013,25(6):71-78.
[4]伏海蛟,汤达祯,许浩,等.致密砂岩储层特征及气藏成藏过程[J].断块油气田,2012,19(1):47-50.
[5]李浩,等.老油田储层物性参数变化规律研究[J].西南石油大学学报(自然科学版),2009,31(2):85-89.
[6]朱健,刘伟利,李兴,等.聚合物驱后储层物性参数的变化特征[J].油气地质与采收率,2007,14(4):65-67.
[7]SY/T 5368-2000.中华人民共和国石油天然气行业标准[S].2000.
[8]SY/T 6285-2011.中华人民共和国石油天然气行业标准[S].2011.
[9]喻建,马捷,路俊刚,等.压汞-恒速压汞在致密储层微观孔喉结构定量表征中的应用-以鄂尔多斯盆地华池-合水地区长7储层为例[J].石油实验地质,2015,37(6):789-795.
[10]高辉,解伟,杨建鹏,等.基于恒速压汞技术的特低-超低渗砂岩储层微观孔喉特征[J].石油实验地质,2011,33(2):206-211.
[11]李卫成,张艳梅,王芳,等.应用恒速压汞技术研究致密油储层微观孔喉特征-以鄂尔多斯盆地上三叠统延长组为例[J].岩性油气藏,2012,24(6):60-65.
[12]蔡玥,等.低渗透砂岩储层孔隙结构对储层质量的影响-以鄂尔多斯盆地姬塬地区长8油层组为例[J].岩性油气藏,2014,26(5):69-74.
[13]张晋言,刘海河,刘伟.核磁共振测井在深层砂砾岩孔隙结构及有效性评价中的应用[J].测井技术,2012,36(3):256-260.
[14]李彦婧,高潮,邓杰,等.东—韩地区延长组长2油层组储层孔隙结构特征[J].岩性油气藏,2012,24(1):52-56.
[15]王国仓,孙敏卓,王鹏,等.柴北缘马北8号构造下干柴沟组下段砂岩储层特征[J].石油学报,2012,33(2):241-248.
[16]李海燕,徐樟有.新立油田低渗透储层微观孔隙结构特征及分类评价[J].油气地质与采收率,2009,16(1):21-25.
[17]魏虎,任大忠,高飞,等.低渗透砂岩储层微观孔隙结构特征及对物性影响-以下寺湾油田柳洛峪区块长2油藏为例[J].石油地质与工程,2013,27(2):26-29.
[18]杨胜来,魏俊之.油层物理学[M].北京:石油工业出版社,2004:222-224.