Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (5): 93-101.doi: 10.12108/yxyqc.20200510

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Characteristics of micro pore structure and movable fluid of extra-low permeability reservoir: a case study of lower Et1 reservoir in A'er Sag,Erlian Basin

UANG Jie1, DU Yuhong1, WANG Hongmei1, GUO Jia1, SHAN Xiaokun1, MIAO Xue1, ZHONG Xinyu2, ZHU Yushuang2   

  1. 1. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China;
    2. State Key Laboratory of Continental Dynamics/Department of Geology, Northwest University, Xi'an 710069, China
  • Received:2020-04-07 Revised:2020-05-08 Online:2020-10-01 Published:2020-08-08

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Abstract: In order to make clear the micro pore structure and the occurrence characteristics of movable fluid of the lower Et 1 reservoir in A'er Sag,Erlian Basin,the experimental studies such as SEM,casting slice,X-ray diffraction,high pressure mercury injection,constant velocity mercury injection and NMR were carried out. The results show that:(1)There are three types of micro pore structure of the lower Et1 reservoir,and different pore structures have different characteristics of occurrence of movable fluid.(2) The pore structure of type Ⅰis mainly composed of intergranular pore-pore shrinking throat and intergranular pore-necking throat,with large throat radius and small pore throat radius ratio. Its T2 spectrum of NMR is mainly left low right high bimodal type,and movable fluid saturation is high. The pore structure of type Ⅱ is mainly composed of intergranular pore-flaky throat and dissolved pore-flaky throat,and its T2 spectrum is mainly left high right low bimodal type,with medium movable fluid saturation. The pore structure of type Ⅲ is mainly composed of intergranular pore-flaky throat combination,dissolved pore-flaky throat combination and intercrystalline pore-bundle throat combination. The throat radius of type Ⅲ is small,with T2 spectrum of left single peak type and low movable fluid saturation.(3)The physical properties,micro pore structure and clay mineral content of the reservoir have an important influence on the occurrence of movable fluid. The characteristics of throat are the main factors affecting the occurrence of movable fluid. The larger the throat radius is,the more the large throat is,the higher the saturation of movable fluid is. The research results have guiding significance for the high-efficiency development of lower Et1 reservoir in A'er Sag.

Key words: micro pore structure, movable fluid, NMR, Tenggeer Formation, Erlian Basin

CLC Number: 

  • TE122.2+3
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