川西南轿顶山地区中—上奥陶统牙形石生物地层和碳同位素地层研究

doi:10.19762/j.cnki.dizhixuebao.2023302.

首页 > 过刊浏览>2023年第97卷第6期 >1741-1752. DOI:10.19762/j.cnki.dizhixuebao.2023302.

川西南轿顶山地区中—上奥陶统牙形石生物地层和碳同位素地层研究
DOI:
                        10.19762/j.cnki.dizhixuebao.2023302.
                    
作者:
                        马雪莹1,2,3马雪莹
中国石油勘探开发研究院,北京,100083;提高采收率国家重点实验室,北京,100083;中国石油天然气集团公司油气储层重点实验室,北京,100083
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邓胜徽1,2,3邓胜徽
中国石油勘探开发研究院,北京,100083;提高采收率国家重点实验室,北京,100083;中国石油天然气集团公司油气储层重点实验室,北京,100083
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李旭4李旭
中国石油天然气股份有限公司长庆油田分公司第四采气厂,内蒙古鄂尔多斯,017399
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王晓梅1,2,3王晓梅
中国石油勘探开发研究院,北京,100083;提高采收率国家重点实验室,北京,100083;中国石油天然气集团公司油气储层重点实验室,北京,100083
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樊如1,2,3樊如
中国石油勘探开发研究院,北京,100083;提高采收率国家重点实验室,北京,100083;中国石油天然气集团公司油气储层重点实验室,北京,100083
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卢远征1,2,3卢远征
中国石油勘探开发研究院,北京,100083;提高采收率国家重点实验室,北京,100083;中国石油天然气集团公司油气储层重点实验室,北京,100083
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罗忠1,2,3罗忠
中国石油勘探开发研究院,北京,100083;提高采收率国家重点实验室,北京,100083;中国石油天然气集团公司油气储层重点实验室,北京,100083
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苏楠1,3苏楠
中国石油勘探开发研究院,北京,100083;中国石油天然气集团公司油气储层重点实验室,北京,100083
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孙燕琪1,2,3孙燕琪
中国石油勘探开发研究院,北京,100083;提高采收率国家重点实验室,北京,100083;中国石油天然气集团公司油气储层重点实验室,北京,100083
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李峰峰1李峰峰
中国石油勘探开发研究院,北京,100083
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作者单位:1. 中国石油勘探开发研究院,北京,100083;2. 提高采收率国家重点实验室,北京,100083;3. 中国石油天然气集团公司油气储层重点实验室,北京,100083;4. 中国石油天然气股份有限公司长庆油田分公司第四采气厂,内蒙古鄂尔多斯,017399
作者简介:马雪莹,女,1987年生。博士,高级工程师,矿产普查与勘探专业。E-mail:xueying.ma1217@petrochina.com.cn。
通讯作者:
中图分类号:
基金项目:中石油十四五前瞻性基础性攻关课题(编号2021DJ0106)资助的成果。

The Middle-Upper Ordovician conodont biostratigraphic and carbon isotope stratigraphic study in southwestern China

Author:

MA Xueying ^{^1,2,3}
MA Xueying
PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;State Key Laboratory of Enhanced Oil Recovery CNPC Key Laboratory of Oil and Gas Reservoir, Beijing 100083, China;CNPC Key Laboratory of Petroleum Reservoir, Beijing 100083, China
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DENG Shenghui ^{^1,2,3}
DENG Shenghui
PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;State Key Laboratory of Enhanced Oil Recovery CNPC Key Laboratory of Oil and Gas Reservoir, Beijing 100083, China;CNPC Key Laboratory of Petroleum Reservoir, Beijing 100083, China
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LI Xu ^⁴
LI Xu
PetroChina Changqing Oilfield Company, the Fourth Gas Production Plant, Ordos, Neimenggu 017399, China
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WANG Xiaomei ^{^1,2,3}
WANG Xiaomei
PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;State Key Laboratory of Enhanced Oil Recovery CNPC Key Laboratory of Oil and Gas Reservoir, Beijing 100083, China;CNPC Key Laboratory of Petroleum Reservoir, Beijing 100083, China
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FAN Ru ^{^1,2,3}
FAN Ru
PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;State Key Laboratory of Enhanced Oil Recovery CNPC Key Laboratory of Oil and Gas Reservoir, Beijing 100083, China;CNPC Key Laboratory of Petroleum Reservoir, Beijing 100083, China
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LU Yuanzheng ^{^1,2,3}
LU Yuanzheng
PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;State Key Laboratory of Enhanced Oil Recovery CNPC Key Laboratory of Oil and Gas Reservoir, Beijing 100083, China;CNPC Key Laboratory of Petroleum Reservoir, Beijing 100083, China
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LUO Zhong ^{^1,2,3}
LUO Zhong
PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;State Key Laboratory of Enhanced Oil Recovery CNPC Key Laboratory of Oil and Gas Reservoir, Beijing 100083, China;CNPC Key Laboratory of Petroleum Reservoir, Beijing 100083, China
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SU Nan ^{^1,3}
SU Nan
PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;CNPC Key Laboratory of Petroleum Reservoir, Beijing 100083, China
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SUN Yanqi ^{^1,2,3}
SUN Yanqi
PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;State Key Laboratory of Enhanced Oil Recovery CNPC Key Laboratory of Oil and Gas Reservoir, Beijing 100083, China;CNPC Key Laboratory of Petroleum Reservoir, Beijing 100083, China
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LI Fengfeng ^¹
LI Fengfeng
PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
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Affiliation:

1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;2. State Key Laboratory of Enhanced Oil Recovery; CNPC Key Laboratory of Oil and Gas Reservoir, Beijing 100083, China;3. CNPC Key Laboratory of Petroleum Reservoir, Beijing 100083, China;4. PetroChina Changqing Oilfield Company, the Fourth Gas Production Plant, Ordos, Neimenggu 017399, China

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摘要:

以上扬子台地西缘轿顶山地区中—上奥陶统宝塔组灰岩为研究对象,连续不间断采集化石样品,识别出牙形石15属20种,并据此识别出3个可与国内外同期地层直接对比的牙形石带,从下到上依次是 Amorphognathus tvaerensis带,Hamarodus brevirameus 带,和 Protopanderodus insculptus 带,研究剖面宝塔组下部与邻区同期地层连续的牙形石带相比缺少1~2个带。另外,通过高精度采集碳、氧同位素样品,在研究剖面宝塔组发现δ13C记录序列中存在同位素正漂移异常,且包含3个次一级峰值,峰值范围在2.0‰~3.0‰之间,同期正漂移异常也出现在上扬子台地东部和南部,该异常开始发生层位在上扬子台地均在牙形石 Hamarodus brevirameus 的首现层位,正漂移异常持续时段跨两个牙形石带( H.brevirameus带和P.inscrulptus 带下部)。该同位素异常事件除了可以在上扬子台地内部很好对比外,也可对比塔里木盆地西缘柯坪地区其浪组中的三个次一级峰值的δ13C同位素正漂移异常事件,其浪组发育正漂移事件的地层厚度较大,沉积速率较上扬子台地高。研究地层中牙形石记录和碳、氧同位素曲线均显示,研究区宝塔组下部存在地层缺失,与下伏地层呈不整合接触关系,且地层缺失量比中扬子地区略少。

关键词:碳同位素; 氧同位素; 牙形石; 地层对比; 宝塔组; 奥陶系; 上扬子台地

Abstract:

The Middle-Late Ordovician Pagoda limestone in the Jiaodingshan area of western Upper Yangtze platform was used as the studying object and continuous fossil samples were obtained in the Pagoda Formation. Fifteen genera and twenty species were identified and three conodont zones were divided which could be correlated with China and globally. In ascending order, they are Amorphognathus tvaerensis zone, Hamarodus brevirameus zone, and Protopanderodus insculptus zone. It is found that there is one or two conodont zones absence in the lower Pagoda Formation compared with typical continuous conodont zones in the adjacent areas. Besides, high resolution of carbon and oxygen isotopic samples were collected in the Pagoda Formation. The positive drift anomaly is found in the δ13C isotope sequence of the Pagoda Formation, which contains three secondary peaks, ranging from 2.00‰ to 3.00‰. The positive excursions also occur in the eastern and southern parts of the Upper Yangtze platform. The conodont Hamarodus brevirameus made its first appearance at the beginning of this excursion and the excursion spans two conodont zones ( H.brevirameus zone and the lower part of the P.inscrulptus zone). It could be well correlated with the Upper Yangtze platform and also could be compared with the positive drift anomaly events of the Qilang Formation with three secondary peaks in the Kalpin area, the western Tarim Basin, where the strata thickness is larger and the deposition rate is higher. The results of carbon and oxygen isotopes and conodonts demonstrate that there is hiatus in the lower part of Pagoda Formation, which is less than that in the Middle Yangtze platform, and it is speculated that there is an unconformity contact relationship in the Pagoda Formation with the underlying strata.

Key words:carbon isotope; oxygen isotope; conodont; stratigraphic correlation; Pagoda Formation; Ordovician; Upper Yangtze platform

引用本文

马雪莹,邓胜徽,李旭,王晓梅,樊如,卢远征,罗忠,苏楠,孙燕琪,李峰峰.2023.川西南轿顶山地区中—上奥陶统牙形石生物地层和碳同位素地层研究[J].地质学报,97(6):1741-1752.
MA Xueying, DENG Shenghui, LI Xu, WANG Xiaomei, FAN Ru, LU Yuanzheng, LUO Zhong, SU Nan, SUN Yanqi, LI Fengfeng.2023. The Middle-Upper Ordovician conodont biostratigraphic and carbon isotope stratigraphic study in southwestern China[J]. Acta Geologica Sinica,97(6):1741-1752.

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收稿日期:2022-08-01
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在线发布日期: 2023-07-05
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