000			01936nab a2200205 4500
005			20260520000319.0
008			260224s2015 xxu ing
041			_aInglés
245	0	0	_aCretaceous volcanic reservoirs and their exploration in the Songliao Basin, northeast China
260			_a _b _cmar. 2015
270			_a18/06/2015 ; 18/06/2015
300			_a24 p. ; 499-523
520			_aTranscripción 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.
581			_a3
773	0		_tAAPG Bulletin _g99
942			_cARTICULO
100	1		_aWang, Pujun _954549
100	1		_aChen, Shumin _954550
999			_c188945 _d188945