Journal of the Japanese Association for Petroleum Technology
Online ISSN : 1881-4131
Print ISSN : 0370-9868
ISSN-L : 0370-9868
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Volume 78, Issue 3
Displaying 1-5 of 5 articles from this issue
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Original Article
  • An evaluation of gas migration phenomenon in shallow ground using two phase flow analysis
    Hiroshi Suenaga, Eiji Nakata, Shiro Tanaka, Kameichiro Nakagawa
    2013 Volume 78 Issue 3 Pages 243-256
    Published: 2013
    Released on J-STAGE: April 03, 2015
    DOIhttps://doi.org/10.3720/japt.78.243
    JOURNAL FREE ACCESS
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    A conceptual diagram of upward gas migration in a shallow ground, hydrogeological structure model and two phase flow model of groundwater and methane were constructed in this study using results of the survey and the test which were performed for the shows of the natural gas in the surface adjacent to the fault and its fractured zone. Numerical simulation of the methane upward movement in the ground was conducted by using these models. The results showed that capillary pressure, methane saturation of around 0.02-0.03 at 100m deep, fault fracture zone, and trap structure caused by fault displacement could reproduce the behavior of the methane movement in the shallow ground.
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  • Experimental study of effective cuttings transport in drilling highly inclined geothermal wells
    Shigemi Naganawa
    2013 Volume 78 Issue 3 Pages 257-264
    Published: 2013
    Released on J-STAGE: April 03, 2015
    DOIhttps://doi.org/10.3720/japt.78.257
    JOURNAL FREE ACCESS
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    Japan is estimated to have the third-largest amount of geothermal resources in the world. However, developments have been restricted for several decades because approximately 80% of the country's geothermal resources are located in its national parks. Recently, the government has announced plans to approve the development of geothermal energy if access is made outside the national parks using directional drilling technology.
    The author experimentally studied effective cuttings transport for highly inclined geothermal wells in which drilling fluids with low to moderate viscosity and low density are generally used for the inhibition of drilling fluid gelation due to high temperature, the prevention of lost circulation, and the reduction of cost. Optimum drilling fluid properties and operating conditions determined on the basis of the experimental results were discussed in this study.
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  • Petroleum geology and geochemistry of the Amarume oil field, Yamagata Prefecture
    Susumu Kato, Amane Waseda, Hideki Nishita, Hirotsugu Iwano
    2013 Volume 78 Issue 3 Pages 265-275
    Published: 2013
    Released on J-STAGE: April 03, 2015
    DOIhttps://doi.org/10.3720/japt.78.265
    JOURNAL FREE ACCESS
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    Interpretation on radiolarian fossil data of Nakaseko and Sugano (1972) based on Kato and Obuse (2013) shows that oil reservoirs in the Amarume oil field, Yamagata Prefecture, belong to the lower part of the Kitamata Formation and the Kusanagi Formation. This result harmonizes with foraminiferal fossil assemblages in wells around the field.
    Oils produced in the field, Amarume oils, are mostly classified into light oil and slightly biodegraded. Medium oils in the southern part of the field are strongly biodegraded due to meteoric waters invaded from the south.
    The Amarume oils resemble oils in the Yurihara and Ayukawa fields in geochemical characteristics including relationship between API gravity and sulfur content, carbon isotope compositions of oils, light hydrocarbon compositions and biomarker maturity parameters, but are clearly distinguished from oils in the Kosei area, Akita Prefecture. Relative oil maturity among oils in the Amarume, Yurihara and Ayukawa fields varies depending on maturity parameters used. In addition to oil maturity, gas maturity and Bouguer anomaly map suggest that oil and gas generated in the center of depression near Sakata have migrated into the Amarume field.
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