Research On Gas Reservoir-forming Conditions Of Huoshiling Formation In Shuangliao Depression

Shuangliao Depression is located in the eastern depression belt in the south of Songliaobasin, has got multi-port industrial gas Wells in Huoshiling formation. In order to define theaccumulation gas whether Huoshiling formation has industrial gas accumulation and may bebeneficial gas gathering area, though comprehensive analysis the older data of ShuangliaoDepression and seismic of Huoshiling formation， we need to research on gasreservoir-forming conditions in Huoshiling formation of Shuangliao depression.In terms of source rocks, by using the experimental data of source rock respectivelymapped the TOC, chloroform bitumen "A", rock pyrolysis parameters S1+S2and the plot ofS1+S2and TOC maps, etc. Shuangliao depression is final evaluation results show that theabundance of organic matter, on the whole, for the medium level; at the same time usingthemaceral of kerogen, biological identification of compound, the plot of Pr/NC17andPh/nC18and hydrogen index and Tmax judgment Shuangliao depression type organic mattertype is Ⅱ~Ⅲ, give priority to with Ⅲ type; According to the Ro evaluation results it isconcluded that Shuangliao depression source rocks in the mature and high mature nearboundaries, has reached the stage of a large number of generated gas.Based on Huoshiling Formation of Shuangliao depression volcanic lithology andlithofacies study shows volcanic lithology is given priority to with the dacite lava, lithofaciesis given priority to with burst facies, The eruption hot detritus flows the subfacies of thehighest proportion; analysis of Huoshiling Formation of Shuangliao depression reservoirspace characteristics known Huoshiling formation of Shuangliao depression complexreservoir space types, fault in the main reservoir space for the primary porosity in the primarypore, mainly occurs for basic lava lithology, secondary pore in the dissolution pores are alsoimportant reservoir space.According to Shuangliao Depression mudstone caprock development situation, statistics,found that the Shuangliao Depression mudstone caprock distribution range, thickness ofsingle layer is larger, and the accumulative thickness is larger, mud ratio above fifty percent,capping ability. In terms of trap condition, according to Shuangliao Depression current data analysisfound that Shuangliao Depression sag is mainly tectonic trap, lithologic trap of volcanic trapand stratigraphic trap.And classification and evaluation of traps in the area.For the gas reservoir-forming conditions in Huoshiling formation of ShuangliaoDepression and elements based on the comprehensive study of geological conditions, thenatural gas accumulation is analyzed and summarized main control factors.According to thenatural gas reservoir forming favorable target area classification criterion in SongliaoBasin,the Ⅰzone in Huoshiling formation of Shuangliao Depression was in and aroundshuang9well.