FORMING MECHANISM OF CHANG 2 LOW RESISTIVITY OIL LAYER, YANCHANG FORMATION, JIYUAN REGION, ORDOS BASIN
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摘要: 根据大量铸体薄片、扫描电镜、物性分析、压汞曲线、含油饱和度及矿化度等资料,对鄂尔多斯盆地姬塬地区延长组长2低阻油层的形成机理进行了详细研究。长2油层组低阻油层形成的主要原因有3个方面,即:高束缚水饱和度、低含油饱和度及高矿化度地层水。孔隙结构复杂、高岭石晶间微孔发育及细粒岩石骨架,造成喉道偏细、孔喉半径小,形成高束缚水饱和度;低幅度构造背景、低油柱高度及低油气充注程度,是造成油层低含油饱和度、油水分异差的主因;高矿化度的地层水,降低了油层与水层的电阻率对比度。根据研究区长2地化热解参数统计,结合试油资料及测井孔隙度数据,建立了热解参数轻质油含量与孔隙度的关系图版,以此判断油层、油水同层、水层和干层。Abstract: Based on data of casting sheet images,SEM,physical property,mercury injection curves,oil saturation and formation water salinity,forming mechanism of Chang 2 low resistivity oil layer of Yanchang Formation in Jiyuan region of the Ordos Basin has been analyzed.There are mainly 3 reasons for the formation of the low resistivity oil layer,including high irreducible water saturation,low oil saturation and high formation water salinity.Complex porosity structure,development of micro-pores among kaolinite crystal and fine grained rock framework form thin throat and small pore throat radius,which cause high irreducible water saturation.Low oil saturation is mainly caused by low amplitude tectonic setting and low oil column height.High formation water salinity reduces resistivity contrast between oil layer and water layer.According to statistics of geochemical pyrolysis parameters of Change 2 oil layer,combined with data of oil testing and well logging porosity,the cross plot of S1 and Φ has been built,by which the Chang 2 low resistivity oil layer of Yanchang Formation in Jiyuan region can be recognized.
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[1] 中国石油勘探与生产公司.低阻油气藏测井识别评价方法与技术[M].北京:石油工业出版社,2006 [2] 廖健德,王绪龙,张明等.陆梁油田低阻油层成因及其识别[J].新疆地质,2003,21(3):325-327 [3] 黄志龙,蒲秀刚,梁春秀等.松辽盆地南部低阻储层特征及其形成机理[J].天然气工业,2006,26(8):27-29 [4] 潘和平,王家映,樊政军等.新疆塔北三叠系低阻油气层特征及成因研究[J].天然气工业,2004,24(5):39-41 [5] 葛秋现,王立新,赵伟祥等.文南油田低阻油层的成因及测井评价方法[J].国外测井技术,2003,18(5):30-32 [6] 陈清华,孙述鹏,李琴.孤东油田东营组低阻油层成因分析[J].石油大学学报(自然科学版),2004,28(3):9-11 [7] 李国政,李铁.塔里木盆地桑塔木油气田低阻油气层形成机理[J].新疆地质,1999,17(1):49-54 [8] 郑维才,陈为贞,高聚同等.孤东油田北部地区低阻油层研究与挖潜[J].油气地质与采收率,2007,14(4):45-47 [9] 麻坪社,张旭波,韩艳华等.鄂尔多斯盆地低阻油层成因分析及解释方法[J].国外测井技术,2005,20(4):8-12 [10] 张丽霞,朱国华,李民.准噶尔盆地白垩系低电阻油层成因[J].新疆石油地质,2004,25(4):388-389 [11] 席胜利,刘新社,王涛.鄂尔多斯盆地中生界石油运移特征分析[J].石油实验地质,2004,26(3):229-235 [12] 罗蛰潭.油层物理[M].北京:地质出版社,1984 -
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