| Show SOURCE OF NATURAL GAS AND COSTS natural as is found in the small cavities or pores in gas g rock called gas sai sand id or gas rock beds of sand or porous which lie under the earths surface between closer textured beds that prevent the b gas as from escaping states the bureau of mines in technical pape natural gas a s manual for the home recently issued natural gas is often associated with oil but in many gas cas fields none has been found most deposits of gas occupy only the higher parts of porous beds the lower parts usually being filled with salt water under pressure and in many places oil containing absorbed gas fills a part of the bed below the gas and above the water the reason for this relation of the three fluids is that they tend to sort themselves according to weight b gas gas being 6 lighter than oil and oil lighter than water consequently the oil has risen above the water gas has accumulated above the oil and the gas has been forced by the pressure of the water into the higher z parts of the porous beds for this reason upholds of the earths cust may be fa favorable arable places to drill for gas as such folds are called anti clines and domes As the pressure of a field decreases and the wells become less productive more wells are required to supply a given demand for natural gas more inore pipe lines and equipment are required to gather the gas from the wells and machinery must be used to compress p om press the gas b as so that it will flow through the pipe lines As nearby near by fields become less productive the use of natural za gas as must diminish unless it can be obtained from brorn more remote sources and if 6 gas as from such sources is available it can be obtained only by increased investment and other expenditures the cost of supplying natural gas to any community must therefore increase as the reserve of natural gas T as available to that community is depleted |
