1887

Abstract

Summary

The pore structure of gas-bearing shale is very complex. NMR is a key means to detect pore structure of shale both in laboratory and in downhole. Porosity measurement is fundamental for NMR application. In the paper we collected eighteen shale samples in Sichuan Basin to investigate NMR porosity. T2 measurement under three conditions, dry, water-saturated, and desaturated, was made. Otherwise the gas porosity with helium and the water porosity with the weight method were obtained. The results show that NMR signal in the dry shale sample is induced by the bound water. The water porosity is greater than the gas porosity because of clay mineral absorbing water. T2 distribution of shale is narrow and T2 is also short. Water-saturated NMR porosity is greater than the water porosity, but the difference between NMR porosity of the water-saturated and the dry sample is well correlated with the water porosity. With comparing of the saturated and the desaturated, the NMR porosity changes little. Less bound water is unable to move or evaporate to produce NMR signal in the dry shale sample.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201412641
2015-06-01
2024-04-24
Loading full text...

Full text loading...

References

  1. RossD J K, BustinR M
    , 2009. The importance of shale composition and pore structure upon gas storage potential of shale gas reservoir, Marine and petroleum Geology, 26(6), 916–927
    [Google Scholar]
  2. LoucksR G, ReedR M, RuppelS C, JarvieD M
    , 2009. Morphology, genesis, and distribution of nanometer- scale pores in siliceous mudstone of Mississippian Barnet shale, Journal of Sedimentary Research, 79(11–12), 848–861
    [Google Scholar]
  3. ClarksonC R, SolanoN, BustinR M
    , 2013. Pore structure characterization of North American shale gas reservoir using USANS/SANS, gas adsorption, and mercury intrusion, Fuel, 103, 606–616
    [Google Scholar]
  4. KlaverJ, DesboisG, LittkeR, UraiJ L
    , 2015. BIB-SEM characterization of pore space morphology and distribution in postmature to overmature samples from Haynesville and Bossier shales, Marine and petroleum Geology, 59, 451–466
    [Google Scholar]
  5. MartinezG A, DavisL A
    , 2000. Petrophysical measurements on shales using NMR, SPE 62851
    [Google Scholar]
  6. GannawayG
    , 2014. NMR investigation of pore structure in gas shales, SPE 173474
    [Google Scholar]
  7. ZhangYuanzhong
    , 2008. Experimental study of the matrix paramagnetic effects on nuclear magnetic resonance T2 measurement for volcanic breccia, SEG Meeting, Expanded Abstracts, 1779–1783
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201412641
Loading
/content/papers/10.3997/2214-4609.201412641
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error