三塘湖盆地西峡沟东区低电阻油层储集特征及成因分析
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摘要
通过薄片鉴定、压汞等方法,结合测井、地层水分析资料对三塘湖盆地西峡沟东区西山窑组低电阻油层进行研究,结果表明,储层岩性主要为岩屑砂岩和长石岩屑砂岩,成分成熟度和结构成熟度低,储集空间以剩余粒间孔和溶蚀粒内孔为主,孔隙结构属粗喉细歪度型,沉积环境对低电阻地层的形成起到了关键作用。储层菱铁矿和黄铁矿的大量分布以及较高的地层水矿化度是该区低电阻油层形成的主要原因。
Through thin section identification and mercury injection, in combination with logging data and formation water analysis, the study on the low resistivity oil layers from Xishanyao formation in east area of Xi'xiagou of Santanghu basin was carried out. The results indicate that the main lithology is lithic sandstone and feldspathic lithic sandstone, with lower compositional and texture maturity, the reservoir space is dominated by residual intergranular pores and dissolution inner pores, and the sedimentary environment plays a key role in the formation of low resistivity oil layers, which is mainly due to the massive distribution of siderite and pyrite and high formation water salinity.
Through thin section identification and mercury injection, in combination with logging data and formation water analysis, the study on the low resistivity oil layers from Xishanyao formation in east area of Xi'xiagou of Santanghu basin was carried out. The results indicate that the main lithology is lithic sandstone and feldspathic lithic sandstone, with lower compositional and texture maturity, the reservoir space is dominated by residual intergranular pores and dissolution inner pores, and the sedimentary environment plays a key role in the formation of low resistivity oil layers, which is mainly due to the massive distribution of siderite and pyrite and high formation water salinity.
引文
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[2]朱筱敏,米力军,钟大康,等.济阳坳陷古近系成岩作用及其对储层质量的影响[J].古地理学报,2006,8(3):295-305.
[3]谢青,王建民,江宽,等.鄂尔多斯盆地太阳湾地区长2特低渗储层评价及有利区预测[J].兰州大学学报,2015,51(4):488-495.
[4]张威,马超,齐荣.柳杨堡气田太2段致密砂岩储层特征及分类标准研究[J].石油地质与工程,2014,28(2):42-45.
[5]钟大康,祝海华,孙海涛,等.鄂尔多斯盆地陇东地区延长组砂岩成岩作用及孔隙演化[J].地学前缘,2013,20(2):61-68.
[6]杨春梅,张吉昌.成因机理控制下的低电阻油层发育特征及地质目标优选[J].吉林大学学报(地球科学版),2009,39(2):328-333.
[7]杨玉祥.鄂尔多斯盆地北部FF区低阻油气层评价方法[J].西安石油大学学报:自然科学版,2010,17(4):1-5.
[8]回雪峰,吴锡令,谢庆宾,等.大港油田原始低电阻率油层地质成因分析[J].勘探地球物理进展,2003,26(4):329-332.
[9]司学强,郭沫贞,杨志力,等.新疆三塘湖盆地马朗凹陷侏罗系西山窑组沉积特征及沉积模式[J].古地理学报,2015,17(4):553-564.
[10]白振华,孙培元,孙宝才,等.准噶尔盆地乌夏断裂带构造特征及其油气成藏意义[J].石油地质与工程,2011,25(3):19-22.