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

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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.

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	Articles by authors
	LI Fayou
	BAN Shuyue
	WANG Guangfu
	SUN Jianfang
	DING Feng
	SUN Yu
	WANG Tengyu
	XU Hai
	CHEN Shiwang
	XIA Changsheng
	ZHENG Naixi
	BAO Zhidong

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

Received: 18 October 2023

ZTFLH:

P618.13

Fund:

special project of Department of Science and Technology,Sinopec(No. P23180)and National Key Research and Development Program of China(Nos.2017YFC0603104,2018YFC0604304)

Corresponding Authors: 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.

Cite this article:

LI Fayou,BAN Shuyue,WANG Guangfu et al. 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.

URL:

http://www.gdlxb.cn/EN/10.7605/gdlxb.2024.01.011 OR http://www.gdlxb.cn/EN/Y2024/V26/I1/17

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