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Volume 31 Issue 2
Jun.  2012
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Article Navigation >  CARSOLOGICA SINICA  > 2012  >  31(2): 212-219
SANG Qin, HUANG Jing, CHENG Chao, WEI Yong, Lü Zong-gang, WU Chang-long, PENG Zuo-yuan. Research on the relation between the ancient karst landform and the development features of fissure-cavity system in the Maokou formation in Shunan region[J]. CARSOLOGICA SINICA, 2012, 31(2): 212-219. doi: 10.3969/j.issn.1001-4810.2012.02.016
Citation: SANG Qin, HUANG Jing, CHENG Chao, WEI Yong, Lü Zong-gang, WU Chang-long, PENG Zuo-yuan. Research on the relation between the ancient karst landform and the development features of fissure-cavity system in the Maokou formation in Shunan region[J]. CARSOLOGICA SINICA, 2012, 31(2): 212-219. doi: 10.3969/j.issn.1001-4810.2012.02.016
shu

Research on the relation between the ancient karst landform and the development features of fissure-cavity system in the Maokou formation in Shunan region

doi: 10.3969/j.issn.1001-4810.2012.02.016
  • 1.

    Resource and Environment Institute, Southwest Petroleum University

  • 2.

    Shunan Gas Field, Petro China Southwest Oil and Gas Field Com pany

  • Received Date: 2011-08-26
  • Publish Date: 2012-06-25
    Abstract
  • The ancient karst landform of the Maokou formation in Shunan region controls the facture-cavern system’s development. According to the thickness distribution of the Maokou formation in the region, the surface erosion on weathering crust and sediment properties as well as the degree of preservation of the Maokou formation, the ancient karst landforms in the Maokou formation can be recognized as or divided into three 2nd grade landform units as karst platform, karst slope (further divided into the western steep slope and northeastern gentle slope belt) and karst basin. Then the relationship of geomorphic unit and the cave system is studied. The results show that: water in karst platform seeps mainly vertically, weathering is strong, vertical solution fissure and cave is often filled with clay; the karstification is the strongest in the karst steep slope and the transition zone of karst steep slope to karst platform where pore and cave are developed, filling rate is low, fissure-cavity system develops best, and is favorable for exploration; the speed of water flow in karst gentle slope is slow, karst cycle is long and fissure-cavity system is easy to be filled, which does not conducive to fissure-cavity reservation; the erosional space in karst basin is less, and the reservoir performance is poor, which makes the area unfavorable for exploration.

     

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