Geological Aspects of Producing Reserves from Complex Gas Deposits

摘要

The main problems encountered in the operation of Cenomanian gas deposits at the late stages of development are considered in the article. On the base of the analysis of primary data, the dependence of the gas saturation coefficient on the height location of the reservoir from the gas-water contact was determined. An analysis of the porosity coefficient in the zone of limit gas saturation revealed an increase in the porosity down the section to the gas-water contact. The change in porosity in the poorly gas-saturated zone (zone of gas-water contact2) occurs according to the opposite law - an increase in the porosity of the rocks as moving up. This fact confirms the presence of reservoir heterogeneity, depending on the geological peculiarities of the structure and the formation conditions of the deposit. Experience of operation of the main reservoir has proved the necessity of operating the zone of limit gas saturation and the poorly gas-saturated zone of the productive reservoir of the Cenomanian deposit as an independent development object.