Oil & Gas Geology ›› 2017, Vol. 38 ›› Issue (4): 792-804.doi: 10.11743/ogg20170416

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A sedimentology study of carbonate reservoirs in Callovian-Oxfordian Stage, Amu Darya Basin,Turkmenistan

Cui Cui1, Zheng Rongcai1, Wang Qiang2, Song Haiqiang3, Wu Lei4, Fei Huaiyi2, Wen Wen5   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    2. Geological Exploration and Development Research Institute, CNPC Chuanqing Drilling Engineering Company Limited, Chengdu, Sichuan 610051, China;
    3. Shaanxi Yanchang Petroleum and Development Engineering Co., Ltd., Xi'an, Shaanxi 710075, China;
    4. CNPC Amu Darya Gas Corporation, Beijing 100101, China;
    5. No.1 Oil Production Plant, PetroChina Qinghai Oilfield Company, Dunhuang, Gansu 736200, China
  • Received:2016-07-05 Revised:2017-02-20 Online:2017-08-28 Published:2017-09-09
  • Contact: 郑荣才(1950-),教授、博士生导师,沉积学和石油地质学。E-mail:zhengrc@cdut.edu.cn。 E-mail:zhengrc@cdut.edu.cn

Abstract: The Amu Darya basin,located in northeastern Turkmenistan,is one of the most important petroliferous basins in central Asia.Three third-order shallowing-upward stratigraphic sequences,each of which is composed of two system tracts (transgressive system tract and highstand system tract),were recognized in the basin based on analyses of core observation,logging and seismic data.A sedimentology study of the Calov-Oxfordian carbonate platform reservoirs in the area reveals that there are six facies:evaporate platform,restricted platform,open platform,platform margin reef,gentle slope and basin.Among them,the platform margin reef and gentle slope reef flat are considered potential reservoirs for play fairways.The reservoirs are mostly rudist bivalve reef limestone and all sorts of grain limestones.Primary pores are well preserved and fracture-pore networks are common in the reservoirs.It is suggested that the distribution of reservoirs in the platform margin and the slope is obviously affected by controlling factors such as reef presence,distribution of shoal facies belts favorable for oil and gas accumulations,burial diagenesis.An understanding of these factors could be useful for oil and gas exploration activities in the future.

Key words: sequence stratigraphy, seismic sedimentology, reef flat facies belt, Callovian-Oxfordian, Amu Darya Basin, Turkmenistan

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