Characteristics and controlling factors of the Cambrian carbonate reservoirs in Bachu area,Tarim Basin,NW China

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  • 1.Research Institution of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    2.Institute of Petroleum Exploration and Development,Tarim Oilfield Company,PetroChina,Korla 841000,China

Received date: 2015-09-15

  Revised date: 2015-11-23

  Online published: 2019-09-19

Abstract

The main objectives of this paper are to study the features and controlling factors of the Cambrian carbonate reservoirs in Bachu area,based on the field investigation,core observation,thin-section analysis and porosity-permeability data as well as geochemical tests including cathodoluminesecnce,carbon-oxygen isotopes and trace elements.The results show that there are three sets of reservoirs of the Cambrian carbonate rocks in the study area.They are salt-overlying dolomite reservoir in the Upper Cambrian Qiulitage Formation (R1),dolomitic limestone reservoir between salt beds in the Middle Cambrian Shayilike Formation (R2) and salt-underlying dolomite reservoir in the Lower Cambrian Xiaoerbulake Formation (R3).The R1 and R3 dolomite reservoirs,comprised of (relict) grainy dolomite,very fine to fine-crystalline dolomite and microbial dolomite,are characterized by dissolution vug and fracture-dissolution vug porosity.The development of these reservoirs is collectively controlled by the sedimentary facies and multiple-stage dissolution.The formation base of the R1 and R3 reservoirs is associated with the high-energy facies such as shoal bank and microbial mound,and evaporite-carbonate transitional zones such as semi-evaporitic tidal-flat facies with anhydrite-bearing dolomite.The interbedded karstification,occurred during penecontemporaneous stage,further modified the pre-existing reservoirs and formed a series of porous layers with laminar dissolutionvugs,which stacked vertically and distributed in a larger range laterally.The hydrothermal dissolution,occurred in burial stage,locally alternated the reservoirs with high initial porosity,but the effect range is limited.Otherwise,it is significant for the porosity preservation that the moderate dolomitization of the grainy sediments occurred in the shallow burial.The R2 reservoir is composed of mottled and/or banded dolomitic limestone.The porosity of the reservoir is associated with the dolomitized burrows,suggesting the bioturbation plays a vital role for the pore creation in the low energy environment.

Cite this article

Huang Qing-yu, Hu Su-yun, Pan Wen-qing, Liu Wei, Zhang Yan-qiu, Shi Shu-yuan, Wang Kun . Characteristics and controlling factors of the Cambrian carbonate reservoirs in Bachu area,Tarim Basin,NW China[J]. Natural Gas Geoscience, 2016 , 27(6) : 982 -993 . DOI: 10.11764/j.issn.1672-1926.2016.06.0982

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