Advances in Earth Science
Ju Yiwen,Bu Hongling,Wang Guochang
Ju Yiwen, Bu Hongling, Wang Guochang. Main Characteristics of Shale Gas Reservoir and Its Effect on the Reservoir Reconstruction[J]. Advances in Earth Science, 2014, 29(4): 492-506.
Shale gas is an unconventional gas which has adsorbent and free state with a small amount of dissolving. Its reservoir heterogeneity is strong and has physical characteristics of low porosity, ultra-low permeability. Shale gas reservoir need to make reconstruction after gas well completion to get a good yield. Hydraulic fracturing technology which is commonly used in unconventional reservoir to improve shale gas exploitation. Based on the previous studies, characteristics of shale gas reservoirs are discussed and summarized in detail from the rock distribution, reservoir heterogeneity, composition, geological environment, petro physical characteristics and the impact of these characteristics on reservoir reconstruction. Reservoir heterogeneity is very strong no matter in vertical or horizontal direction, mainly on the structure and construction of shale gas reservoirs, which owes to organic matter and mineral composition of shales. The structure and composition of shale gas reservoirs are controlled by different tectonic background effect, and thereby constrain mechanical properties, reservoir sensitivity of rocks and development of natural fractures. Rock composition, and structure, natural fractures and ground stress play a key role in the shale-gas reservoir transformation. Therefore, this study not only has important scientific significance to broaden theories for shale gas reservoir stimulation, but also has important practical value and production efficiency to improve the production of shale gas.