南美奥连特盆地白垩系Napo组Main-M1亚段沉积体系重建及油气勘探意义<sup>*</sup>

doi:10.7605/gdlxb.2024.01.011

古地理学报 ›› 2024, Vol. 26 ›› Issue (1): 17-27. doi: 10.7605/gdlxb.2024.01.011

南美奥连特盆地白垩系Napo组Main-M1亚段沉积体系重建及油气勘探意义^*

李发有¹, 班舒悦^2,3, 王光付¹, 孙建芳¹, 丁峰¹, 孙钰¹, 王腾宇^2,3, 徐海¹, 陈诗望¹, 夏昌盛^2,3, 郑乃熙^2,3, 鲍志东^2,3

1 中国石油化工股份有限公司石油勘探开发研究院,北京 102206;
2 中国石油大学(北京)地球科学学院,北京 102249;
3 油气资源与工程全国重点实验室,中国石油大学(北京),北京 102249

收稿日期:2023-10-18 出版日期:2024-02-01 发布日期:2024-01-23
通讯作者: 班舒悦,女,1997年生,中国石油大学(北京)博士研究生,主要从事沉积学研究。E-mail: lillianknow@gmail.com。鲍志东,男,1964年生,教授,博士生导师,主要从事储层地质与油藏描述、沉积学及岩相古地理等研究。E-mail: baozhd@cup.edu.cn。
作者简介:李发有,男,1980年生,现在主要从事开发地质研究。E-mail: lify.syky@sinopec.com。
基金资助:
*中国石油化工股份有限公司科技部专项课题(编号: P23180)和国家重点研发计划专项(编号: 2017YFC0603104,2018YFC0604304)联合资助

Sedimentary system reconstruction and implications for hydrocarbon exploration of the Cretaceous Napo Formation Main-M1 submember in Oriente Basin,South America

LI Fayou¹, BAN Shuyue^2,3, WANG Guangfu¹, SUN Jianfang¹, DING Feng¹, SUN Yu¹, WANG Tengyu^2,3, XU Hai¹, CHEN Shiwang¹, XIA Changsheng^2,3, ZHENG Naixi^2,3, BAO Zhidong^2,3

1 Petroleum Exploration and Production Research Institute,Sinopec,Beijing 102206,China;
2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;
3 National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China

Received:2023-10-18 Online:2024-02-01 Published:2024-01-23
Contact: BAN Shuyue,born in 1997,is a Ph.D. candidate at the China University of Petroleum(Beijing). She is currently engaged in sedimentary research. E-mail: lillianknow@gmail.com. BAO Zhidong,born in 1964,is a professor and supervisor of the Ph.D. candidate. He is mainly engaged in reservoir geology and reservoir description,sedimentology and lithofacies palaeogeography. E-mail: baozhd@cup.edu.cn.
About author:LI Fayou,born in 1980,is mainly engaged in the development of geological research. E-mail: lify.syky@sinopec.com.
Supported by:
special project of Department of Science and Technology,Sinopec(No. P23180)and National Key Research and Development Program of China(Nos.2017YFC0603104,2018YFC0604304)

摘要/Abstract

摘要：

厄瓜多尔奥连特盆地是南美安第斯前陆盆地群中最重要的含油气盆地之一,上白垩统Napo组Main-M1亚段是目前勘探开发的主力层位之一,其沉积环境一直存在争议,沉积体系及演化过程尚不明确。本研究基于岩心、测录井等资 main-M1亚段沉积时期的主要沉积微相类型、沉积体系及演化过程进行了研究。结果表明: 研究区位于水动力条件复杂的海陆过渡环境,在东部发育潮汐三角洲,向西部逐渐过渡为浅海陆棚环境; 研究区内主要识别出水下分流河道、水下分流河道间、潮汐水道、潮汐沙坝、潮汐沙坪、潮汐水道间等8类沉积微相。根据岩电特征, main-M1亚段划分为3个小层。通过分析3个小层的岩性组合演变特征 main-M1亚段沉积时间内,Auca古隆起逐渐形成,同时挠曲作用导致相对海平面升高,3个小层在垂向上呈水体逐渐变深、潮汐三角洲前缘不断向陆地退缩的形式; 基于对Main-M1亚段沉积时期潮汐三角洲—浅海陆棚沉积体系的重建,研究区东部的水下分流河道及前缘沙坝也被认为具有一定的岩性油气藏勘探潜力。

关键词: 潮汐三角洲, 陆棚, 沉积微相, 沉积模式, 沉 main-M1亚段, 奥连特盆地, 南美洲

Abstract:

The Oriente Basin of Ecuador is one of the most important hydrocarbon-bearing basins in the Andean Foreland Basin Group of South America. The Main-M1 submember of the Upper Cretaceous Napo Formation,as one of the main exploration and developement formations,has been controversial in terms of its depositional environment,and its depositional system and evolutionary process remain unclear. Based on core,well logs and borehole cuttings,the main sedimentary microfacies types,depositional systems and evolutionary processes of Main-M1 submember were investigated in this study. The results show that the study area is located in a marine-continental transition environment with complex hydrodynamic conditions,and a tidal delta develops in the east,which gradually transitions into a shallow shelf environment in the west. In the study area,eight types of sedimentary microfaces including subaqueous distributary channel,subaqueous inter-channel,tidal channel,tidal sand bar,tidal flat,and tidal inter-channel,are recognized. According to the petrographic characteristics,the Main-M1 submember is further divided into three sub-layers. By analyzing the lithological assemblages of the three submembers,it is determined that during depositional of the Main-M1 submember,the Auca paleoarchelon gradually formed,and meanwhile the relative sea level of the study area rose due to the flexural effect. The three submembers overall show a gradual deepening upward trend and the tidal delta continuously retreated landward. Based on the reconstruction of the tidal delta-shelf depositional system during deposition of the Main-M1 submember,the subaqueous distributary channel and the leading sand bar in the eastern part of the study area are considered to have certain exploration potential for lithologic reservoirs.

Key words: tidal delta, shelf, sedimentary microfacies, depositional model, Main-M1 submember, Oriente Basin, South America

中图分类号:

P618.13

李发有, 班舒悦, 王光付, 孙建芳, 丁峰, 孙钰, 王腾宇, 徐海, 陈诗望, 夏昌盛, 郑乃熙, 鲍志东. 南美奥连特盆地白垩系Napo组Main-M1亚段沉积体系重建及油气勘探意义^*[J]. 古地理学报, 2024, 26(1): 17-27.

LI Fayou, BAN Shuyue, WANG Guangfu, SUN Jianfang, DING Feng, SUN Yu, WANG Tengyu, XU Hai, CHEN Shiwang, XIA Changsheng, ZHENG Naixi, BAO Zhidong. Sedimentary system reconstruction and implications for hydrocarbon exploration of the Cretaceous Napo Formation Main-M1 submember in Oriente Basin,South America[J]. JOPC, 2024, 26(1): 17-27.

http://www.gdlxb.cn/CN/Y2024/V26/I1/17

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南美奥连特盆地白垩系Napo组Main-M1亚段沉积体系重建及油气勘探意义^*

Sedimentary system reconstruction and implications for hydrocarbon exploration of the Cretaceous Napo Formation Main-M1 submember in Oriente Basin,South America

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南美奥连特盆地白垩系Napo组Main-M1亚段沉积体系重建及油气勘探意义*

Sedimentary system reconstruction and implications for hydrocarbon exploration of the Cretaceous Napo Formation Main-M1 submember in Oriente Basin,South America

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南美奥连特盆地白垩系Napo组Main-M1亚段沉积体系重建及油气勘探意义^*