01936nab a2200205 4500 20260520000319.0 260224s2015 xxu ing Inglés Cretaceous volcanic reservoirs and their exploration in the Songliao Basin, northeast China mar. 2015 18/06/2015 ; 18/06/2015 24 p. ; 499-523 Transcripción del resumen del autor: Major reservoirs in the Songliao Basin (SB) are composed of volcanic rocks below 3000 m (9843 ft) of buried depth. Gas accumulations are mostly found in the buried volcanic highs, which in general correspond to paleovolcanic centers. Porosity in the volcanic rocks depends on both primary and secondary processes. The best porosity is preferentially developed in a proximal facies near the central part of each volcanic edifice. Porosity and permeability decrease with depth of burial for both volcanic and nonvolcanic sections, but their porosity-depth trends differ. Lava and welded ignimbrite slowly lose porosity with burial depth because they solidified by cooling, and their groundmasses BLTN13095eq1 are poor in quartz and calcite precipitation, thus preserving porous space. In contrast, the associated sandstone, conglomerate, tuff, and tuffite are more sensitive to overburden pressure, suffering more intense compaction and cementation. As a result, porosity and permeability of lava and ignimbrite exceed that of the other rocks, and thus, they are the best reservoir rocks below burial depths of ca. 3000 m (9843 ft) in the SB. The paleovolcanic domes are rich in both lava rocks and fractures of diverse origin, and the topographic highs provide favorable locations for gas migration and accumulation. 3 AAPG Bulletin 99 ARTICULO Wang, Pujun 54549 Chen, Shumin 54550 188945 188945 0 0 0 0 256764 BAAB BAAB 2026-03-06 200061171 0 200061171 2026-03-06 00:19:05 2026-03-06 ARTICULO