Unconventional gas resources - Shale Gas Introduction

shale gas is mined from shale in natural gas, is an important unconventional gas resources. Shale gas formation and enrichment has its own unique characteristics, often located in the basin of thick, widely distributed shale source rock formations. Compared to more conventional natural gas, shale gas development has a long life and exploitation of the advantages of long production cycle, most of the shale gas production and wide distribution, thickness, and generally containing gas, which makes shale gas wells to a stable long-term rate of gas production. Especially occur in  shale Unconventional gas .
Is also dense shale rock, it can also be classified as tight gas gas. Industrial development is only achieved success in North America (mainly the United States). It began in the Appalachian Basin Devonian shale, is dark brown and black, organic-rich, can be a lot of angry. Cracks in the main reservoir space, and in the form of adsorbed gas and water soluble gas occurrence, is low (negative) pressure, low saturation (about 30%), and thus for the low yield. But in fracture zone receive higher yield, underground explosions and rehabilitation measures fracturing effect is good. The mid-1990s has been expanded to Michigan and Illinois basins, producing layers extend to the Lower Carboniferous shales, production reached 8.4 billion cubic meters. Amount of its resources up to several trillion cubic meters.
Distribution of North American craton shale gas basins, foreland basin Jurassic, Devonian - Mississippian enrichment multiple causes, multiple maturity shale gas resources. How many sets of Chinese coal basin development and dark clay, shale formations, large set of interbedded sandstone exists a dense root edge gas, shale gas development favorable conditions for gas discoveries of different sizes, but is not yet in a large area achieve further breakthroughs in natural gas exploration. Statistics show that China Southern marine shale formations may be shale gas mainly enriched regions. In addition, Songliao, Ordos, Turpan-Hami, Junggar and other continental sedimentary basin has shale gas shale formations enrichment of the basis and conditions. Chongqing Qijiang, Pine Valley, Nanchuan, Wulong, Pengshui, Youyang, Xiushan and Wuxi  shale gas  resources in other counties are the most favorable metallogenic belt, so it is identified as the first target area field survey work.