OBTURATION FACTORS ASSEMBLING NATURAL GAS:TAKING NORTH REGION OFJIZHONG SAG AS THE EXAMPLE

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  • Research Institute of Exploration and Development, CNPC, Bejing 100083,China

Received date: 2004-08-30

  Revised date: 2004-10-09

  Online published: 2004-12-20

Abstract

Due to pervasion diffusibility of gas, obturation  factors of gas is very importance in rift-basin with tension  tectonic suffering more tectonization. A lot of difference types gas pools have been explored in north region of Jizhong sag, China northern, besides having excellent source rocks of  generating gas hydrocarbon, and  yet relation of obturation factors of gas. The paper generally discussed obturation factors (cover) assembling gas, expatiated main research results.The capillary pressure obturation standard of gas pool be founded in the region, withⅠ-Ⅱ types cover being good and better, Ⅲ-Ⅳ types cover being middling,for them being capable of obturating gas pools. The displacement pressure values from coal covers, Bengxi-Sanxi group of Carboniferous-Permian, can be more then 5 MPa, belong to Ⅱ-Ⅲ types of being better cover. The displacement pressure values of mud-rock covers, Ek-Es3 of  Lower  Terrtiary, commonly can be more then 0.5 MPa, the most value is the 2.83 MPa, with containing nor-coMPaction zone, being primary source rocks stratum. Therefore, superpressure-obturation-action and hydrocarbon-obturation-action are more important, covers of Ek-Es3 are to belong better covers. Factors of  rocks and diagenesis: The obturation capability of cover is depressed along with increase of arenaceous rocks; thick single mud rocks can debase pervasion action  of gas. The rocks of middling extent of diagenesis has the most excellent capability of obturation, in other word, with being early diagenesis B phase-late  diagenesis A phase. Factors of stratum and tectonic: lower amplitude traps are better obturation action of gas then higher amplitude. Obturation acton of fault  be engendered by character and scale of fault as well as stratum contact between ascend and lift stratum, but some small size late fault is destruct action to  obturation after produced gas pools.

Cite this article

FANG Jie . OBTURATION FACTORS ASSEMBLING NATURAL GAS:TAKING NORTH REGION OFJIZHONG SAG AS THE EXAMPLE[J]. Natural Gas Geoscience, 2004 , 15(6) : 572 -579 . DOI: 10.11764/j.issn.1672-1926.2004.06.572

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