Types, evolution and favorable reservoir facies belts in the Cambrian-Ordovician platform in Gucheng-Xiaotang area, eastern Tarim Basin

被引：0
作者：
Zhang Y. [1 ,2 ]
Li Q. [3 ]
Zheng X. [1 ,2 ]
Li Y. [4 ]
Shen A. [1 ,2 ]
Zhu M. [1 ,2 ]
Xiong R. [1 ,2 ]
Zhu K. [1 ,2 ]
Wang X. [3 ]
Qi J. [4 ]
Zhang J. [3 ]
Shao G. [1 ,2 ]
She M. [1 ,2 ]
Song X. [1 ,2 ]
Sun H. [5 ]
机构：
[1] CNPC Key Laboratory of Carbonate Reservoirs, Hangzhou
[2] PetroChina Hangzhou Research Institute of Petroleum Geology, Hangzhou
[3] Exploration and Development Research Institute, Daqing Oilfield Limited Company, Daqing
[4] Exploration Utility Department, Daqing Oilfield Limited Company, Daqing
[5] Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla
来源：
Shiyou Xuebao/Acta Petrolei Sinica | 2021年 / 42卷 / 04期
关键词：
Cambrian-Ordovician; Distally steepened carbonate slope; Eastern Tarim Basin; Gucheng-Xiaotang area; Homoclinal ramps; Platform type; Rimmed carbonate platform; Weakly rimmed open platform;
D O I：
10.7623/syxb202104003
中图分类号：
学科分类号：
摘要：
Based on the analysis of cores, thin sections and seismic data, this paper systematically studies the types, evolution and oil-gas exploration potential of the Cambrian-Ordovician carbonate platform in the transition zone from platform to basin in Gucheng-Xiaotang area, eastern Tarim Basin. From the aspects of tectonic evolution of basin, lithofacies characteristics, and seismic facies characteristics, this paper analyzes the types and characteristics of carbonate platform margins in different periods, and establishes four types of deposition models of carbonate platform margins. During the deposition of the Xiaoerbulake Formation and Wusonggeer Formation, it was shown as a homoclinal carbonate ramp, and the microbial mound beach on a shallow gentle slope at the periclinal position of paleo-uplift is the favorable reservoir facies belt. The Cambrian Miaoling series develops a rimmed carbonate platform with the development of accretion-type mound-beach complex, and the favorable reservoir facies belt is the core of the mound-beach complex at high positions of ancient landscape and mound-flat-beach complex. Weakly rimmed carbonate platform is developed in the Cambrian Furongian Series, and mound-beach ridges and foreset beach bodies are favorable reservoir facies belts. During the deposition of the Lower Ordovician Penglaiba Formation and Member 3 of Yingshan Formation, it was presented as a distally steepened carbonate slope, and the dolomitized beach on the upper part of the shallow gentle slope was a favorable reservoir facies belt. During the deposition of Member 2 of the Yingshan Formation and the Yijianfang Formation, weakly rimmed open platform is developed, where the favorable reservoir facies belt was packstone beach and mound beach facies at high positions of the ancient landscape, which evolved into a drowned platform in the Late Ordovician. Affected by tectonic movement and sea level changes, the Cambrian-Ordovician carbonate platform in the transition zone in Gucheng-Xiaotang area underwent an evolutionary process of gentle slope-rimmed platform-gentle slope-weakly rimmed open platform. The rimmed platform marginal mound beach during Miaolingian-Furongian, the distally steepened dolomitized beach in the Penglaiba Formation and Member 3 of Yingshan Formation, the weakly rimmed open platform grainstone beach in Member 2 of the Yingshan Formation and the Yijianfang Formation are three exploration fields for increasing reserve and production. The microbial mound beach in the Xiaoerbulake Formation and Wusonggeer Formation, as well as the slope gravity flow in Miaolingian Series-Furongian Series are two potential risk exploration fields. © 2021, Editorial Office of ACTA PETROLEI SINICA. All right reserved.
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页码：447 / 465
页数：18
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