Chapter 12 - Comparisons of field activities in different worldwide sites

Abstract

Gas hydrate reservoir characteristics vary significantly in both permafrost and marine environments. The origin of gas hydrates, salinity, porous structure, lithology, gas hydrate morphology, and other properties differs a lot. Thus, it is important to compare the gas hydrate reservoirs in different regions of the world. In this chapter of the book, it is aimed to compare gas hydrate reservoirs in Messoyakha field, Mallik field, Nankai Trough, Ignik Sikumi, and Shenhu Area in terms of field activities and field results. The Messoyakha field in Russia is a typical Class 1 hydrate reservoir overlaying with permafrost. The contribution of gas hydrates on gas production was understood later than the discovery of this field as conventional gas reservoir initially. The experiences in gas hydrate production tests in Mallik field, Canada, were useful to activate the similar projects in Alaska, India, and Japan. Moreover, the gas hydrate production trials in Nankai Trough, Japan, are discussed in this section. The first marine gas hydrate production trial was conducted in Nankai Trough, and this field includes gas hydrate in turbidites. The gas hydrate saturation in coarse sands of these turbidites reaches up to 80%. On the other hand, China investigated the gas hydrates inside clayey silt layers by applying new production tests called solid fluidization and formation fluid extraction. Briefly, this book chapter compares and summarizes different gas hydrate field activities and reservoir properties in the world.