川中地区中上寒武统洗象池组颗粒滩储集层特征及主控因素<sup>*</sup>

doi:10.7605/gdlxb.2022.02.021

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Abstract

Within the Middle and Upper Cambrian Xixiangchi Formation,large-scale breakthroughs of the oil and gas exploration never came true and only a small amount of productivity were obtained in the Weiyuan-Ziyang area. Hence,investigating the formation and associated controlling factors of those reservoirs can provide geological basis for the future hydrocargon exploration. Based on outcrops,cores,thin sections,as well as drilling and logging data of the central Sichuan Basin,this study made a detailed description for the characteristics of the Xixiangchi reservoir and then analyzed the influences of the shoal depositional combinations,eogenetic karstification and the telogenetic karstification on the reservoir. The results show that: (1)The Xixiangchi reservoir in the study area is mainly granular dolostone. Based on whether the inner texture of grains can be preserved,the granular dolomite is divided into residual clastic texture dolomite and powder-fine crystal dolomite,whose reservoir spaces come from intergranular dissolved pores,intercrystalline dissolved pores and vugs,and thus,those reservoirs are characterized by low porosity and low permeability as a whole;(2)There are three types of shoal depositional combinations in the Xixiangchi Formation,which are lagoon-shoal(-tidal flat),shoal-tidal flat or mixed tidal flat,and multi-stage shoal vertical overlapping,respectively. The multi-stage shoal vertical overlapping can form a stratal succession with the most grainstone,whose reservoir properties are the best;(3)The eogenetic karstification is crucial for the formation of the reservoir and the telogenetic karstification could also improve the reservoir quality.

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	Articles by authors
	Deng Cheng-Kun
	Li Ting
	Yang Wei-Qiang
	Zhang Xi-Hua
	Cheng Zhong-Zhen
	Chen Hao-Ru
	Zhu Dan-Cheng
	Hu Li-Wen
	Zou Hua-Yao

Key words： shoal depositional combination reservoir characteristics dissolution Xixiangchi Formation central Sichuan Basin

Received: 23 July 2021

ZTFLH:

TE122.2

Fund:

National Natural Science Foundation of China(No.42172152)

Corresponding Authors: Zou Hua-Yao,born in 1963,is a professor of China University of Petroleum(Beijing). He is mainly engaged in oil and gas migration and accumulation mechanism and enrichment law. E-mail: huayaozou@cup.edu.cn。

About author: Deng Cheng-Kun,born in 1996,is a master degree candidate in College of Geosciences,China University of Petroleum(Beijing). He is engaged in sedimentology and reservoir geology. E-mail: 582692959@qq.com。

Cite this article:

Deng Cheng-Kun,Li Ting,Yang Wei-Qiang et al. Characteristics and main controlling factors of shoal reservoirs in the Middle-Upper Cambrian Xixiangchi Formation,central Sichuan Basin[J]. JOPC, 2022, 24(2): 292-307.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2022.02.021 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2022/V24/I2/292

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