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Formation time of secondary pores in the sandstone and hydrocarbon reservoir of Denglouku Formation in Songliao Basin
Author(s): 
Pages: 253-258
Year: Issue:  3
Journal: ACTA PETROLOGICA ET MINERALOGICA

Keyword:  松辽盆地次生孔隙运移通道油气注入成藏期匹配关系;
Abstract: 利用与油气包裹体同期形成的盐水溶液包裹体均一化温度,结合本地区埋藏史和热史,确定登娄库组三、四段砂岩天然气成藏期为96~81.5 Ma,并可细分为3期(分别为93~91 Ma、88.8~82.8 Ma和82.3~81.5 Ma),前两期持续时间长,第3期时间相对较短.根据次生孔隙发育带分布宏观上受T4断层控制、微观上呈发育→较发育→不发育旋回性分布的特点判断,裂缝是酸性流体的运移通道,早期T4断层的形成时期是次生孔隙大量形成的时期:其中青山口组青一段沉积时期储盖匹配性最好,形成的次生孔隙与油气注入时期匹配,易形成气层;姚家组沉积时期储盖匹配关系好,但气源可能不足,该期形成的次生孔隙可能会形成低产气层或气水同层;登娄库组沉积时期储盖匹配性差,形成的次生孔隙难以保存,最终会形成干层.
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