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本文统计辽河断陷断块砂岩油气田天然气CH_4分布特征,认为原始组份中的CH_4含量沿油气运移方向增高。不同油气藏类型CH_4含量的分布界限明显:纯气藏CH_4含量最高,凝析气藏最低,油藏介于二者之间。有气顶的油藏比纯油藏CH_4含量要低。氧化严重的油藏析出的气体CH_4含量特高。油气藏开采中,凝析气藏CH_4含量呈上升——较稳定型;纯气藏(未包括凝析油含量较高的气藏)开采中CH_4含量较稳定;油藏开采中,气顶油藏当油井气窜CH_4含量升高,靠近边水的油井当边水推进油井CH_4含量升高。
In this paper, the CH_4 distribution characteristics of natural gas in the fractured sandstone oil and gas fields in the Liaohe Sag are analyzed. It is concluded that the content of CH_4 in the original components increases along the direction of hydrocarbon migration. The distribution limits of CH_4 content in different types of oil and gas reservoirs are obvious: the content of CH_4 in pure gas reservoir is the highest, the condensate gas reservoir is the lowest, and the reservoir is in between. The gas-capped reservoirs have a lower content of CH 4 than pure reservoirs. The CH4 content of the gas that is expelled in a serious oxidation reservoir is extremely high. In the exploitation of oil and gas reservoirs, the content of CH_4 in the condensate gas reservoir is rising - more stable. The content of CH_4 in the pure gas reservoir (excluding gas reservoirs with high condensate content) is relatively stable during exploitation. In the exploitation of oil and gas, When CH_4 content in oil wells is increased, the CH_4 content in the wells near the edge water increases while CH_4 in the edge water propulsion wells increases.