南堡凹陷物源体系发育特征与优质储层形成
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摘要
通过岩石成分、矿物组分、重矿物组合特征将南堡凹陷物源体系在平面上划分为5个:西南部物源体系、正南部物源体系、西北部物源体系、东北部物源体系、东部物源体系。不同物源体系孔隙度与渗透率分布规律的对比表明,储层物性最好的是来自西南部物源体系的储层,以中高孔中高渗为主,平均孔隙度为19.26%,平均渗透率为205.75×10-3μm2,其次是来自正南部物源体系的储层,以中低孔中高渗为主,平均孔隙度为13.59%,平均渗透率为123.44×10-3μm2。根据薄片观察、流体包裹体均一温度分布特征,分析出研究区储层成岩作用演化序列,并将南堡凹陷成岩体系分为6类,其中正南部物源体系下的沙一段与西南部物源体系下的东三段到沙三段成岩体系物性最好;成岩体系的形成与物源有关,分选好、杂基含量少的物源体系抗压能力强,压实作用相对较弱,有利于孔隙保存,并使溶蚀作用增强,物性得以改善,成岩后期也能形成优质储层。
Based on the research of rock composition,mineral components and heavy mineral assemblages,we divide the provenance system into five areas on the plane of Nanpu Sag.The provenance might come from southwest,south,northwest,northeast and east.According to the comparison of the distribution of porosity and permeability,we find that the physical properties of reservoirs in the area of the southwest provenance system are the best,in which the pore structure mainly consists of medium-high porosity,medium-high permeability,with an average prosity of 19.26% and average permeability of 205.75×10-3μm2.The second area in the physical characteristics is the south provenance system,having medium-low porosity and medium-high permeability,with an average prosity of 13.59% and average permeability of123.44×10-3μm2.The evolutionary sequence of diagenesis in the sag is discussed by the homogeneity temperature of fluid inclusion and thin section observation in the reservoir.In addition,the diagenetic system is divided into six categories,with the best property ones being the Es1 in south provenance system and Ed3-Es3 in southwest provenance system.These analyses lead to the conclusion that some relation should exist between the formation of diagenetic system and the provenance system.The study suggests that the provenance system with good sorting and few matrix content is difficult to be compacted,and has good conservation of reservoir space and reforming the reservoir physical property.So this is a favorable reservoir area to form high quality reservoirs in the later diagenesis.
Based on the research of rock composition,mineral components and heavy mineral assemblages,we divide the provenance system into five areas on the plane of Nanpu Sag.The provenance might come from southwest,south,northwest,northeast and east.According to the comparison of the distribution of porosity and permeability,we find that the physical properties of reservoirs in the area of the southwest provenance system are the best,in which the pore structure mainly consists of medium-high porosity,medium-high permeability,with an average prosity of 19.26% and average permeability of 205.75×10-3μm2.The second area in the physical characteristics is the south provenance system,having medium-low porosity and medium-high permeability,with an average prosity of 13.59% and average permeability of123.44×10-3μm2.The evolutionary sequence of diagenesis in the sag is discussed by the homogeneity temperature of fluid inclusion and thin section observation in the reservoir.In addition,the diagenetic system is divided into six categories,with the best property ones being the Es1 in south provenance system and Ed3-Es3 in southwest provenance system.These analyses lead to the conclusion that some relation should exist between the formation of diagenetic system and the provenance system.The study suggests that the provenance system with good sorting and few matrix content is difficult to be compacted,and has good conservation of reservoir space and reforming the reservoir physical property.So this is a favorable reservoir area to form high quality reservoirs in the later diagenesis.
引文
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[2]李艳丽,林春明,岳信东,等.白音查干凹陷桑合地区早白垩世都红木组一段沉积演化及物源研究[J].中国地质,2009,36(1):214-228.
[3]刘嵘,董月霞,谭靖,等.沉积岩中稳定重砂矿物的成岩蚀变特征及其指示意义[J].地质科技情报,2007,26(6):10-16.
[4]董月霞,张宁,周海民,等.南堡凹陷油田古近系碎屑重矿物的物源和构造意义[J].地质科技情报,2008,27(5):7-13.
[5]宋春晖,孙淑荣,方小敏,等.酒西盆地晚新生代沉积物重矿物分析与高原北部隆升[J].沉积学报,2002,20(4):552-559.
[6]操应长,宋玲,王健,等.重矿物资料在沉积物物源分析中的应用:以涠西南凹陷古近系流三段下亚段为例[J].沉积学报,2011,29(5):835-841.
[7]白云风,王振升,韦阿娟,等.黄骅坳陷东营组重矿物时空展布特征及物源体系分析[J].大庆石油地质与开发,2008,27(2):39-42.
[8]姜华,王建波,张磊,等.南堡凹陷西南庄断层分段活动性及其对沉积的控制作用[J].沉积学报,2010,28(6):4-10.
[9]章惠,孙思敏,季汉成,等.南堡凹陷边界断层分段特征及其对沉积体系的控制作用[J].油气地质与采收率,2016,23(3):20-25.
[10]王华,姜华,林正良,等.南堡凹陷东营组同沉积构造活动性与沉积格局的配置关系研究[J].地球科学与环境学报,2011,33(1):70-77.
[11]王思琦,鲜本忠,万锦峰,等.南堡凹陷滩海地区东营组和沙河街组一段储层特征及其成因机制[J].东北石油大学学报,2015,39(4):54-62.
[12]李晓艳.南堡凹陷古近系中深层碎屑岩优质储层成因机制研究[D].青岛:中国石油大学(华东),2014.
[13]冯艳红,向芳,王元君,等.渤中凹陷石南斜坡区古近系中深层优质储层形成机理[J].断块油气田,2012,19(4):418-422.
[14]孟元林,高建军,刘德来,等.渤海湾盆地西部凹陷南段成岩相分析与优质储层预测[J].沉积学报,2006,24(2):185-191.
[15]朱筱敏,王英国,钟大康,等.济阳坳陷古近系储层孔隙类型与次生孔隙成因[J].地质学报,2007,7(2):197-204.