Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (6): 63-71.doi: 10.12108/yxyqc.20230608

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Characteristics and controlling factors of high porosity and permeability limestone reservoirs of Cretaceous Cenomanian in the western United Arab Emirates

LUO Beiwei1, YIN Jiquan1, HU Guangcheng2, CHEN Hua1, KANG Jingcheng1, XIAO Meng1, ZHU Qiuying1, DUAN Haigang1   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. China National Oil and Gas Exploration and Development Corporation, Beijing 100034, China
  • Received:2023-06-08 Revised:2023-07-03 Online:2023-11-01 Published:2023-11-07

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Abstract: By using methods such as core and thin section analysis,nuclear magnetic resonance and micro-CT testing,isochronous tracing under sequence framework and paleogeomorphic restoration,a systematic analysis was conducted on the sedimentary characteristics,sequence,sedimentary evolution characteristics and diagenesis of high porosity and permeability limestone reservoirs of Cretaceous Cenomanian in the western United Arab Emirates,and the controlling factors of high porosity and permeability reservoirs were studied from the aspects of structure,sedimentation and diagenesis. The results show that:（1）The high porosity and permeability limestone reservoirs of Cenomanian in the western United Arab Emirates are mainly developed in Mishrif Formation,with the lithologies mainly consisting of sparite rudist limestone,sparite bioclastic limestone,and micrite bioclastic limestone. The reservoirs space is mainly composed of biological cavities,moldic pores and intergranular dissolved pores. The Mishrif Formation is generally characterized by carbonate ramp sedimentation,three types of subfacies including inner ramp,middle ramp and outer ramp,and six types of microfacies including rudistid reefs,high-energy shoals,front/back shoals and inter-shoals,lagoons can be identified. High porosity and permeability reservoirs are mainly developed in rudistid reefs and high-energy shoals. The porosity and permeability of limestone reservoirs in rudistid reefs are 20%-34% and 150-2 000 mD,respectively,while the porosity and permeability of limestone reservoirs in high-energy shoals are 25%-33% and 40-370 mD,respectively.（2）From bottom to top,the Mishrif Formation in the study area can be divided into three third-order sequences SQ1-SQ3 and seven systems tracts. The SQ1-SQ2 sequences are mainly composed of highstand systems tract,with rudistid reefs and high-energy shoals broadly developed. The SQ3 sequence is composed of highstand systems tract and transgressive systems tract,with high-energy shoals well developed in high parts of ancient landform and beeter properties.（3）The pore development of the high porosity and permeability reservoirs of Mishrif Formation in the study area is afffacted by multi-stage of diagenesis,including constructive diagenesis dominated by contemporaneous atmospheric freshwater dissolution and maintenance diagenesis related to hydrocarbon filling.（4）The high porosity and permeability reservoirs of Mishrif Formation in the study area are controlled by multiple geological factors such as sedimentary facies,sequence framework,paleogeomorphology and diagenetic effects,and the sedimentary facies was setted as the main factors. The distribution and evolution of sedimentary facies in Mishrif Formation was controlled by HST during SQ1 and SQ2,while influenced by the inherited paleogeomorphology during the SQ3.

Key words: high porosity and permeability limestone reservoir, carbonate ramp, rudistid reef, high-energy shoal, facies control, sequence stratigraphy, paleogeomorphology, atmospheric freshwater dissolution, Cenomanian limestone, Mishrif Formation, Cretaceous, the western United Arab Emirates

CLC Number: 

  • TE122.2+3
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