Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (5): 11-17.doi: 10.12108/yxyqc.20180502

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Storage space and gas content law of Longmaxi shale in Changning area,Sichuan Basin

SHEN Rui1, HU Zhiming1, GUO Hekun1, JIANG Baicai2, MIAO Sheng1, LI Wuguang3   

  1. 1. Department of Porous Flow & Fluid Mechanics, PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, Hebei, China;
    2. School of Oil and Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;
    3. Shale Gas Research Institute, PetroChina Southwest Oil & Gas Field Company, Chengdu 610021, China
  • Received:2018-01-25 Revised:2018-03-18 Online:2018-09-14 Published:2018-09-14

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Abstract: The shales of the lower Silurian Longmaxi are widely developed in Changning area of Sichuan Basin. The micro pore structure and full-scale pore size distribution characteristics of shale reservoirs in this area are not yet clear. The pore structure of lower Longmaxi shale reservoir was researched by field emission scanning electron microscope(FE-SEM),high pressure mercury intrusion,low temperature nitrogen adsorption and low temperature CO2adsorption. Taking the Ning 203 well as an example,a set of analysis method about nanometer-micrometer full scale pore size distribution was established. The first pore size distribution was obtained by gas adsorption, and the second pore size distribution was obtained by high pressure mercury intrusion in this method. The difference between the data of the pore size distribution obtained by the two kinds of tests was judged. According to the result of the judgment,the pore size distribution data of 3.7-200.0 nm were obtained after treatment. The pore size distribution data of the non-repeated pore size were obtained by the two methods combined. The micropores,mesopores and macropores for core samples in proportion were calculated,so the full-scale pore size distribution data of core samples were obtained. Results show the lower part of Longmaxi shale pore structure is very complex. Micropores are connected in series with mesopores and macropores. The pore throat is small,so the connectivity is poor. Mesoporous and microporous accounted for the percentage of pore volume is more than 80%. Pore throats of the diameter above 15 nm mainly contain free gas,and the ones below 2 nm mainly contain adsorbed gas.

Key words: pore structure, storage space, shale gas, Longmaxi Formation, Sichuan Basin

CLC Number: 

  • TE311
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