大庆长垣扶余油层砂岩中方解石胶结物的碳、氧同位素特征及其成因

doi:10.11743/ogg20150210

石油与天然气地质 ›› 2015, Vol. 36 ›› Issue (2): 255-261.doi: 10.11743/ogg20150210

大庆长垣扶余油层砂岩中方解石胶结物的碳、氧同位素特征及其成因

宋土顺¹, 马锋², 刘立¹, 蒙启安³, 于严龙¹, 刘娜¹, 于淼¹

1. 吉林大学地球科学学院, 吉林长春 130061;
2. 中国石油勘探开发研究院, 北京 100083;
3. 中国石油大庆油田有限责任公司勘探开发研究院, 黑龙江大庆 163712

收稿日期:2014-12-10 修回日期:2015-01-20 出版日期:2015-04-08 发布日期:2015-05-13
通讯作者: 刘立(1955-),男,教授、博士生导师,储层、层序地层及沉积学.E-mail:liuli0892@vip.sina.com. E-mail:liuli0892@vip.sina.com
作者简介:宋土顺(1985-),男,博士研究生,沉积岩石学.E-mail:songtushun@sina.cn.
基金资助:
中国石油大庆油田有限责任公司勘探开发研究院技术开发项目(2012-JS-740);吉林省科技发展计划重点项目(20110426).

Features and genesis of carbon-oxygen isotopes in calcite cement from sandstone in oil-bearing Fuyu layer of Daqing Placanticline

Song Tushun¹, Ma Feng², Liu Li¹, Meng Qi'an³, Yu Yanlong¹, Liu Na¹, Yu Miao¹

1. College of Earth Sciences, Jilin University, Changchun, Jilin 130061, China;
2. Petroleum Exploration and Production Research Institute, PetroChina, Beijing 100083, China;
3. Petroleum Exploration and Development Research Institute, PetroChina Daqing Oilfield Company, Daqing, Heilongjiang 163712, China

Received:2014-12-10 Revised:2015-01-20 Online:2015-04-08 Published:2015-05-13

摘要/Abstract

摘要：

方解石是大庆长垣深层砂岩中广泛分布的一种胶结物，同时方解石胶结作用是大庆长垣扶余油层致密储层的控制因素之一。以方解石胶结物为研究对象，运用薄片鉴定，扫描电镜观察、X-射线衍射分析、包裹体测试和碳、氧同位素分析，查明方解石碳、氧同位素组成及其成因。研究结果表明，储层砂岩类型为长石岩屑砂岩和岩屑长石砂岩，粘土以I/S（伊/蒙混层）+I（伊利石）+K（高岭石）组合为代表。方解石的碳同位素（δ¹³C，PDB）分布范围是-20.3‰～-3.2‰，氧同位素（δ¹⁸O，PDB）的分布范围是-25.3‰～-20.3‰，平均值为-22.67‰。碳、氧同位素分析数据的计算表明，碳酸盐的相对古盐度值（Z）介于73.92～109.89，表明其形成时的古流体均为矿化度较高的淡水；方解石的形成温度为80～100 ℃。方解石胶结物的同位素显示，其形成与有机酸脱羧作用有关，暗示其“碳”来源为有机碳。

关键词: 碳、氧同位素, 方解石胶结物, 岩石学, 扶余油层, 大庆长垣

Abstract:

Calcite is one the most widely spreading cements in deep sandstone reservoirs in Daqing Placanticline.It has also been regarded as the main factor for facilitating the formation of tight reservoirs in oil-bearing Fuyu layer.Thin section,scanning electron microscope,X-ray diffraction,fluid inclusion and carbon/oxygen isotope analyses were carried out on calcite from cored wells penetrating the layer to identify its isotope composition and genesis.The results show that the reservoirs are mainly feldspar lithic and lithic feldspar sandstone with clay minerals represented by I/S+I+K assemblage.The cement has its δ¹³C(PDB)value ranging between -20.3‰ and -3.2‰ and the δ¹⁸O(PDB)value varying from -25.3‰ to -20.3‰ with an average value of -22.67‰.Calculation shows that the paleosalinity Z is between 73.92 and 109.89,indicating a fresh water environment with high salinity for the formation of carbonate.The temperature for the calcite to be formed is between 80 ℃ and 100 ℃ based on converted temperature of isotopes and homogenization temperature of fluid inclusions.Isotope diagrams reveal that the formation of the calcite cement is probability connected with organic acid decarboxylation,inferring an “organic carbon” origin for the carbon in the cement.

Key words: carbon and oxygen isotope, calcite cement, petrology, oil-bearing Fuyu layer, Daqing Placanticline

中图分类号:

TE122.1

宋土顺,马锋,刘立,等. 大庆长垣扶余油层砂岩中方解石胶结物的碳、氧同位素特征及其成因[J]. 石油与天然气地质, 2015, 36(2): 255-261. doi: 10.11743/ogg20150210 Song Tushun,Ma Feng,Liu Li,et al. Features and genesis of carbon-oxygen isotopes in calcite cement from sandstone in oil-bearing Fuyu layer of Daqing Placanticline[J]. Oil & Gas Geology, 2015, 36(2): 255-261. doi: 10.11743/ogg20150210

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大庆长垣扶余油层砂岩中方解石胶结物的碳、氧同位素特征及其成因

Features and genesis of carbon-oxygen isotopes in calcite cement from sandstone in oil-bearing Fuyu layer of Daqing Placanticline

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