摘要:
为了研究砂体输导层输导天然气效率,在砂体输导层输导天然气能力影响因素分析的基础上,建立了一个砂体输导层输导天然气能力评价参数,利用此评价参数对我国11个以砂体为主要输导通道的大中型气田砂体输导层输导天然气能力进行了研究。通过我国11个以砂体为主要输导通道的大中型气田天然气聚集效率与砂体输导层输导天然气能力评价参数之间的关系研究得到,高效、中效和低效砂体输导层输导天然气能力评价参数分别为大于0.25,0.25~0.03和小于0.03。根据西斜坡区萨二、三油层砂体输导层输导特征,对其砂体输导层输导天然气效率进行了研究,得到西斜坡区萨二、三油层砂体输导层输导天然气效率相对较高,仅在富拉尔基以西有限地区为中、低效砂体输导层输导天然气能力区,其余广大地区皆为高效砂体输导层输导天然气能力区。目前西斜坡区萨二、三油层已发现的天然气藏皆分布在高效砂体输导层输导天然气能力区内,表明齐家—古龙凹陷生成排出的天然气向西斜坡区运移具良好的输导条件。
Abstract:
To study gas-transporting efficiency through sandbody, a parameter to evaluate gas transportation ability through sandbody was set up based on the analysis of factors influencing gas- transporting ability through sandbody. Using the evaluation parameter of gas-transporting ability through sandbody, 11 large and medium gas fields of which the gas-transporting pathway is sandbody were studied. By the study on the relationship between gas accumulation efficiency and evaluation parameter of gas- transporting ability through sandbody of the above-mentioned gas fields, it was considered that the evaluation parameter of gas-transporting ability through sandbody with high, middle and low efficiency to be separately more than 0.25，0.25~0.03and less than 0.03. According to transportation characteristics through sandbody of S2+3 oil layer in west slope region, gas-transporting efficiency through sandbody in the region was studied. It was believed that gas-transporting efficiency through gandbody of S2+3 oil layer in west slope region was high. Although gas-transporting efficiency is middle and low at the limited area in the west of Fulaerji, gas-transporting efficiency is high in other regions. All gas reservoirs of S2+3 oil layer in west slope region now distribute in gas-transporting area through sandbody with high efficiency. It indicates that its own good transporting condition is the main reason for gas from Qijia-Gulong sag to migrate to west slope region.
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