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- Title
鄂尔多斯盆地东北缘叠置含气系统中菱铁质泥岩测井识别及地质意义.
- Authors
肖骞; 沈玉林; 秦勇; 申建; 顾娇杨; 张春良
- Abstract
This research quantifies the logging identification characteristics of the mudstone containing siderite and establishes its identification template accordingly using the method of logical analysis and the spider diagram analysis, based on the drill core observation and the logging data from Benxi Formation to Taiyuan Formation in the northeast area of the Ordos Basin. It is analyzed that the mudstone containing siderite has the features of high Photoelectric Absorption Coefficient(PE), high Density(DEN), high Natural Gamma(GR), low Interval Transit Time(AC), low Resistivity(M2RX) and low Neutron Porosity(CNCF). The results of siderite identification of 12 drills in the research area show that the mudstone containing siderite is unevenly distributed with the total thickness of 3.9-25.4m and the total layers of 8-28. It is concluded that mudstone containing siderite has the characteristics of low porosity, low permeability and high breakthrough pressure according to the quantitative analysis of the logging data. The average permeability, average effective porosity, and average breakthrough pressure of the mudstone containing siderite is 2.29×10-8μm2, 1.20%, and 12.32MPa, respectively, which specifies its function as the impermeable gas barrier. Based on the spatial development position, sedimentary environment and forming process of the siderite containing siderite, four stable gas barriers are identified from Benxi Formation to Taiyuan Formation in the research area. The strata from Benxi Formation to Taiyuan Formation are divided into 5 independent Coalbed-Methane Systems combining the gas survey data. The boundary of each independent Coalbed-Methane System is the interlayer which develops a certain scale of rock stratum mainly consisting of mudstone containing siderite vertically and has the characteristics of stable area distribution and good continuity.
- Publication
Natural Gas Geoscience, 2017, Vol 28, Issue 4, p590
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2017.02.010