This paper deals with the proposal of a new hypothesis for inflammable natural gas pools of special type found theoretically by the writer in 1948 and has been studied in succession. The hypothesis for the special gas pools is characterized essentially by inflamable natural gas dissolved in the underground water with saturate solubility without oil. The saturate degree is generally determined by the physical and chemical conditions of the solvent water under the ground. The reservoir pressure and temperature are the main factors which control the solubility of inflammable natural gas for the undergound water.
Many productive gas wells for the gas pools of this type have already successfully drilled and now under drilling in many areas in Japan from Hokkaidõ to Kyüshü, especially vividful in Niigata plain and Southern Kantõ basin. The gas pools of this type are important for our country because more than 80% of total inflammable natural gas production of Japan is occupied by the gas of this type. Many theoritical results have been obtained by us by the observation of these gas fields during last eleven years from 1948 to 1959. These theories derived out of hypothesis proposed here seem not only true, but has no contradiction among many theoritical explanations of the gas field phenomena each other on the point of geological and geophysical views.
As the examples of derived theories from the new hypothesis, this paper also takes up some themes and their outlines.
These themes are shown as follows; (1) vertical disolved gas distribution in the pore water of all strata in the gas field, (2) the gas contents in the inflammable natural gas pools dissolved-in-water type, (3) geochemical prospecting of gas fields, (4) syncline theory for inflammable natural gas pools dissolved-in-water type, (5) arc type exploitation method, (6) calculation of self flowing power for the flowing gas wells, (7) enrichment of inflammable natural gas pools dissolved-in-water type, (8) calculation of gas reserves, (9) stability of natural gas production, (10) generation of gas pools with abnormally high gas-water ratio.
As a result, many theories derived from the same one hypothesis have given us nearly enough explanations for many phenomena on these gas pools and have no contradiction among these explanations each other.
Therefore this basemental hypothesis “the natural gas in the gas pools with under ground water exists in the underground water with dissolved feature” can be considered as the one of the new believable theory.
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