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The Combination Relationship and Gas Bearing Character of Cracks and Positive Rhythm, Inverted Rhythm Sand Body

Author: XiHui
Tutor: ZhangJinGong
School: Northwestern University
Course: Solid Geophysics
Keywords: Ordos Basin Positive rhythm sand body Anti - rhythm Sand body Crack Gas
CLC: P618.13
Type: Master's thesis
Year: 2010
Downloads: 85
Quote: 0
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Abstract


In this paper , on the basis of regional geological data , core data , logging data , conventional permeability test data and simulation data , the combination of characteristics of the Upper Paleozoic in Ordos Basin cracks , reverse rhythm sand body , sandstone conducting performance and positive and negative rhythm sand body containing gas characteristics were analyzed. The understanding obtained as follows : (1 ) Upper Paleozoic , mainly developed in parallel to the level in the reverse rhythm of rock in the sand body at the interface level structure and development of sandstone seam and low-angle oblique seam level structure development , structure relatively dense or homogeneous sandstone mainly developed nearly vertical joints . ( 2 ) is the reverse rhythm sand body fracture development , with crack in sandstone porosity than that without crack Sandstones about 2% of the high porosity of cracks accounted for 20% -30% of the total porosity of the sandstone , the penetration of cracks the rate of sandstone permeability of a few dozen to a dozen times . The positive rhythm sandstone at the bottom of the sand body without considering the cracks , porosity , permeability is generally higher porosity, permeability sandstone at the top of the Anti - rhythm sand body is generally higher . (3) in positive rhythm sand body nearly vertical joints are not developed , the rhythm the lower part of the sand body is the favorable position of the gas . The positive rhythm sand body nearly vertical joints and development , the rhythm of the upper part of the sand body is the favorable position of the gas , the main reason is that natural gas is easy to nearly the top of the vertical joints filled . Reverse rhythm sand body , regardless of the near-vertical seam development or not, the rhythm of the upper part of the sand body containing gas favorable position .

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Fuel deposits > Oil, natural gas
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