Geology, geography and global energy

Scientific and Technical Journal

Development of gas fields in complex geological and geochemical conditions

2014. №4, pp. 69-75

Serebryakova Valentina I. - Senior Lecturer, Astrakhan Civil Engineering Institute, 18 Tatishchev st., Astrakhan, 414056, Russian Federation,

Investigated processes gazogidrotekhnika on the gas fields, which are located in semi-arid South-Western part of the Caspian depression. In the sediment deposits of the region divided into three lithologic-structural-bearing floor - pre-salt carbonate, salt sulfateslightly and post-salt terrigenous. The salt deposits containing industrial gas reserves dedicated to the sandy rocks of the Vetluga and baskunchakskii horizons of the Triassic. Geological and gatherwritermetadata research on gas fields allow you to obtain the basic parameters of sedimentary rocks and the salt composition of formation waters in the process of gazogidrotekhnika not only in the wells, but also in commercial pipelines. Vetluga gas-bearing horizon lithological presents interlayering of sandstones, siltstones and clays. Total power Vetluzhskiy sediments is 285 m. Sandstones and siltstones from light to dark gray, fine - and medium-grained, calcareous. Sandstones containing industrial gas reserves occur in the upper part of the Vetluga cut at depths 2770-2730 m. Effective productive capacity of the species to 7.4 m Porosity reservoirs ranges from 12 to 21 %. Baskunchak gas bearing horizon, lie above the Vetluga at depths from 2640 to 2710 m, is represented by quartz sandstones and siltstones. Total power baskunchakskii horizon reaches 350 m the Effective power of the productive horizon of up to 6 m The porosity of the reservoir varies from 10 to 21 %. In the sole productive baskunchakskii layer thickness of clays 40-50 m is bluedomino impermeable covering for Vetluga gas deposits.

Key words: газ, гидрат, месторождения, Прикаспийская впадина, порода, гидрогеология, gas, hydrate, fields, Caspian sea basin, breed, hydrogeology