鄂尔多斯盆地南部奥陶系碳酸盐储层的胶结作用

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鄂尔多斯盆地南部奥陶系碳酸盐储层的胶结作用

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中图分类号: P618.130.2+1 TE122.2+21

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Cementation of the Ordovician Carbonate Reservoirs in the South Ordos Basin, China

摘要

摘要: 鄂尔多斯盆地南部奥陶系马家沟组主要由原始沉积的碳酸盐岩和岩溶角砾岩组成。储集空间以次生孔隙为主。中奥陶世沉积作用之后不久，即发生了溶解作用、白云石沉淀、干化脱水作用、机械压实作用、岩溶作用和胶结作用。胶结作用很普遍，主要发生在中石炭世之后的埋藏条件下，是对储层重要的破坏作用。充填于硬石膏结核溶模孔和非组构选择性溶蚀孔、洞、缝的方解石和白云石是最常见的胶结物。这些方解石和白云石胶结物具泥晶、嵌晶状或粒状晶粒结构。泥晶白云石基质的δ18O值-10.98‰~-0.8‰，平均-5.54‰；δ13C值-4.76‰~5.77‰，平均1.51‰。充填于溶蚀孔、缝中的白云石的δ18O值-12.54‰~-2.67‰，平均-7.34‰；δ13C值-5.56
‰~3.48‰，平均0.28‰。充填于溶蚀孔、缝方解石的δ18O值-15.42‰~-6.02‰，平均-9.51‰；δ13C值-12.44‰~1.33‰，平均-3.20‰。总的来说，白云石和方解石胶结物的δ18O和δ13C值低于泥晶白云石基质的，原因是形成晚，受淡水淋滤、埋藏作用和有机质影响较大。泥晶白云石基质的Na含量0~350 μg/g，平均59 μg/g； Sr含量0~380 μg/g，平均10 μg/g；Fe含量0~14 570 μg/g，平均1 040 μg/g；Mn含量0~4 670 μg/g，平均183 μg/g。充填于次生孔隙中的胶结物的Na、Sr、Mn含量与泥晶白云石基质的差别不大，因这些元素含量均低。充填于次生孔隙的碳酸盐胶结物较泥晶白云石基质有明显高的Fe含量。胶结物包裹体的均一温度在90℃~140℃范围内。胶结物沉淀于埋藏较深，温度较高的还原条件下。流体包裹体的气相成分以CH4最为普遍，液相成分以H2O占绝大多数。早期胶结物形成于天然气形成前，晚期胶结物形成于天然气形成之后。岩溶洼地是胶结作用最发育的地带。
- 鄂尔多斯盆地南部 /
- 胶结作用 /
- 碳氧同位素 /
- 微量元素 /
- 流体包裹体
Abstract: The Ordovician Majiagou Formation mainly consists of carbonate rocks originally deposited and karst bareccia. The reservoir space is mainly secondary pores. After deposition dissolution, dolomitization, desiccation, physical compaction, karstification and cementation soon began. Cementation, which mainly occurred under the burial conditions after the middle Carboniferous, is common and important destructional dianenesis for reservoirs. The micritic, equant sparry and poikilotopic calcite and dolomite, infilling moldic pores of anhydrite concretion, and nonfabric selective dissolution pores and fractures, are common cements. The δ18O and δ13C values of micritic dolomite range from 10.98‰ to 0.8‰, averaging 5.54‰; and from 4.76‰ to 5.77‰, averaging 1.51‰, respectively. The δ18O and δ13C values of dolomite cements infilling dissolution pores range from 12.54‰ to 2.67‰, averaging 7.34‰; and from 5.56‰ to 3.48‰, averaging 0.28‰ respectively. The δ18O and δ13C values of calcite cements infilling dissolution pores range from 15.42‰ to 6.02‰, averaging 9.51‰; and from 12.44‰ to 1.33‰, averaging 3.20‰, respectively. The δ18O and δ13C values of dolomite and calcite cements are generally lower than of micritic dolomite, because of late formation, fresh water leaching, burial diagenesis and influence of organic materials. The Na, Sr, Fe and Mn content of micritic dolomite, dolomite cements and calcite cements ranges from 0 to 350 μg/g, averaging 59 μg/g; from 0 to 380 μg/g，averaging 10 μg/g; from 0 to 14 570 μg/g, averaging 1 040μg/g; and from 0 to 4 670 μg/g, averaging 183 μg/g, respectively. The Na, Sr, and Mn content of dolomite and calcite cements is similar with that of micritic dolomite, because all trace elements content is low. Fe content of dolomite and calcite cements is higher than that of micritic dolomite. The homogenization temperatures of fluid inclusions in the cements range 90~140℃. All indicates that the cements formed under reduced conditions with high temperature in the deep burial environments. The most gaseous phase of the fluid inclusions consists of CH4, while the most liquid phase is H2O. The early and late cements formed before and later formation of the natural gas respectively. The cementation developed extensively in the kart depressions.
- south Ordos basin /
- cementation /
- carbon and oxygen isotopes /
- trace elements /
- fluid inclusions

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[1]	樊婷婷, 柳益群, 周鼎武, 车飞翔, 杨皓凯. 鄂尔多斯南缘长7油页岩中钙质结核成因探讨 . 沉积学报, 2023, 41(3): 932-944. doi: 10.14027/j.issn.1000-0550.2021.104
[2]	王峰, 刘新社, 赵伟波, 张雷, 虎建玲, 田景春, 陈蓉, 王集, 吴静仪, 肖云霄. 鄂尔多斯盆地南部二叠系砂岩碎屑锆石年代学特征及地质意义 . 沉积学报, 2023, 41(5): 1396-1413. doi: 10.14027/j.issn.1000-0550.2022.118
[3]	李姣莉, 王建强, 彭恒, 李科亮, 丰孝林, 张东东. 鄂尔多斯盆地南部下白垩统宜君组碎屑锆石U⁃Pb年龄及物源意义 . 沉积学报, 2023, 41(5): 1609-1623. doi: 10.14027/j.issn.1000-0550.2022.022
[4]	向坤鹏, 贺永忠, 赵磊, 安亚运, 盘应娟, 何犇, 刘奎勇. 黔西南郭家湾地区中三叠世坡段组幻龙化石埋藏环境——来自碳酸盐岩岩相与碳、氧同位素的指示 . 沉积学报, 2019, 37(5): 957-967. doi: 10.14027/j.issn.1000-0550.2018.184
[5]	杨永恒, 孙国强, 王晔桐, 朱文军, 秦彩虹, 管斌. 柴达木盆地北缘平台地区路乐河组沉积环境与成岩流体特征 . 沉积学报, 2019, 37(6): 1258-1268. doi: 10.14027/j.issn.1000-0550.2019.008
[6]	王峰, 刘玄春, 邓秀芹, 李元昊, 田景春, 李士祥, 尤靖茜. 鄂尔多斯盆地纸坊组微量元素地球化学特征及沉积环境指示意义 . 沉积学报, 2017, 35(6): 1265-1273. doi: 10.14027/j.cnki.cjxb.2017.06.017
[7]	袁静, 杨学君, 袁凌荣, 成荣红, 朱忠谦, 李春堂, 董道涛. 库车坳陷DB气田白垩系砂岩胶结作用及其与构造裂缝关系 . 沉积学报, 2015, 33(4): 754-763. doi: 10.14027/j.cnki.cjxb.2015.04.014
[8]	孙国强, 吕婧文, 赵明君, 朱军, 吴剑锋, 陈章群, 史基安. 柴达木盆地鄂博梁Ⅲ号中新统成岩作用及沉积环境 . 沉积学报, 2015, 33(2): 337-347. doi: 10.14027/j.cnki.cjxb.2015.02.013
[9]	杨丽丽. 黔南宾夕法尼亚亚纪珊瑚礁相腕足动物氧同位素组成及其古水温信息 . 沉积学报, 2011, 29(3): 458-464.
[10]	于炳松, 陈建强, 李兴武, 林畅松. 塔里木盆地肖尔布拉克剖面下寒武统底部硅质岩微量元素和稀土元素地球化学及其沉积背景 . 沉积学报, 2004, 22(1): 59-66.
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鄂尔多斯盆地南部奥陶系碳酸盐储层的胶结作用

刊出日期: 2013-06-10

中图分类号: P618.130.2+1 TE122.2+21

关键词:

摘要: 鄂尔多斯盆地南部奥陶系马家沟组主要由原始沉积的碳酸盐岩和岩溶角砾岩组成。储集空间以次生孔隙为主。中奥陶世沉积作用之后不久，即发生了溶解作用、白云石沉淀、干化脱水作用、机械压实作用、岩溶作用和胶结作用。胶结作用很普遍，主要发生在中石炭世之后的埋藏条件下，是对储层重要的破坏作用。充填于硬石膏结核溶模孔和非组构选择性溶蚀孔、洞、缝的方解石和白云石是最常见的胶结物。这些方解石和白云石胶结物具泥晶、嵌晶状或粒状晶粒结构。泥晶白云石基质的δ18O值-10.98‰~-0.8‰，平均-5.54‰；δ13C值-4.76‰~5.77‰，平均1.51‰。充填于溶蚀孔、缝中的白云石的δ18O值-12.54‰~-2.67‰，平均-7.34‰；δ13C值-5.56
‰~3.48‰，平均0.28‰。充填于溶蚀孔、缝方解石的δ18O值-15.42‰~-6.02‰，平均-9.51‰；δ13C值-12.44‰~1.33‰，平均-3.20‰。总的来说，白云石和方解石胶结物的δ18O和δ13C值低于泥晶白云石基质的，原因是形成晚，受淡水淋滤、埋藏作用和有机质影响较大。泥晶白云石基质的Na含量0~350 μg/g，平均59 μg/g； Sr含量0~380 μg/g，平均10 μg/g；Fe含量0~14 570 μg/g，平均1 040 μg/g；Mn含量0~4 670 μg/g，平均183 μg/g。充填于次生孔隙中的胶结物的Na、Sr、Mn含量与泥晶白云石基质的差别不大，因这些元素含量均低。充填于次生孔隙的碳酸盐胶结物较泥晶白云石基质有明显高的Fe含量。胶结物包裹体的均一温度在90℃~140℃范围内。胶结物沉淀于埋藏较深，温度较高的还原条件下。流体包裹体的气相成分以CH4最为普遍，液相成分以H2O占绝大多数。早期胶结物形成于天然气形成前，晚期胶结物形成于天然气形成之后。岩溶洼地是胶结作用最发育的地带。

Cementation of the Ordovician Carbonate Reservoirs in the South Ordos Basin, China

Publish Date: 2013-06-10

Keywords:

Abstract: The Ordovician Majiagou Formation mainly consists of carbonate rocks originally deposited and karst bareccia. The reservoir space is mainly secondary pores. After deposition dissolution, dolomitization, desiccation, physical compaction, karstification and cementation soon began. Cementation, which mainly occurred under the burial conditions after the middle Carboniferous, is common and important destructional dianenesis for reservoirs. The micritic, equant sparry and poikilotopic calcite and dolomite, infilling moldic pores of anhydrite concretion, and nonfabric selective dissolution pores and fractures, are common cements. The δ18O and δ13C values of micritic dolomite range from 10.98‰ to 0.8‰, averaging 5.54‰; and from 4.76‰ to 5.77‰, averaging 1.51‰, respectively. The δ18O and δ13C values of dolomite cements infilling dissolution pores range from 12.54‰ to 2.67‰, averaging 7.34‰; and from 5.56‰ to 3.48‰, averaging 0.28‰ respectively. The δ18O and δ13C values of calcite cements infilling dissolution pores range from 15.42‰ to 6.02‰, averaging 9.51‰; and from 12.44‰ to 1.33‰, averaging 3.20‰, respectively. The δ18O and δ13C values of dolomite and calcite cements are generally lower than of micritic dolomite, because of late formation, fresh water leaching, burial diagenesis and influence of organic materials. The Na, Sr, Fe and Mn content of micritic dolomite, dolomite cements and calcite cements ranges from 0 to 350 μg/g, averaging 59 μg/g; from 0 to 380 μg/g，averaging 10 μg/g; from 0 to 14 570 μg/g, averaging 1 040μg/g; and from 0 to 4 670 μg/g, averaging 183 μg/g, respectively. The Na, Sr, and Mn content of dolomite and calcite cements is similar with that of micritic dolomite, because all trace elements content is low. Fe content of dolomite and calcite cements is higher than that of micritic dolomite. The homogenization temperatures of fluid inclusions in the cements range 90~140℃. All indicates that the cements formed under reduced conditions with high temperature in the deep burial environments. The most gaseous phase of the fluid inclusions consists of CH4, while the most liquid phase is H2O. The early and late cements formed before and later formation of the natural gas respectively. The cementation developed extensively in the kart depressions.

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鄂尔多斯盆地南部奥陶系碳酸盐储层的胶结作用

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Cementation of the Ordovician Carbonate Reservoirs in the South Ordos Basin, China

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鄂尔多斯盆地南部奥陶系碳酸盐储层的胶结作用

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Cementation of the Ordovician Carbonate Reservoirs in the South Ordos Basin, China

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鄂尔多斯盆地南部奥陶系碳酸盐储层的胶结作用

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Cementation of the Ordovician Carbonate Reservoirs in the South Ordos Basin, China

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出版历程

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鄂尔多斯盆地南部奥陶系碳酸盐储层的胶结作用

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Cementation of the Ordovician Carbonate Reservoirs in the South Ordos Basin, China

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