岩性油气藏 ›› 2024, Vol. 36 ›› Issue (5): 6776.doi: 10.12108/yxyqc.20240507
黄向胜, 闫琢玉, 张东峰, 黄合庭, 罗程飞
HUANG Xiangsheng, YAN Zhuoyu, ZHANG Dongfeng, HUANG Heting, LUO Chengfei
摘要: 运用流体包裹体、有机地球化学分析和压力模拟手段,综合研究了琼东南盆地东部Ⅱ号断裂带新生界多期热流体活动及天然气运聚特征。研究结果表明:①琼东南盆地东部Ⅱ号断裂带BX19-2构造天然气主要为烃气和CO2,烃气为煤型气和油型气的混合气,但不同气层中天然气组分含量差异较大,浅部三亚组气层为相对高含量的烃气(体积分数为83.93%)和低含量的有机成因CO(2体积分数为7.11%);较深部的陵水组气层为含量相对较低的烃气(体积分数为16.10%~76.63%)和含量相对较高的幔源CO(2体积分数为18.70%~81.56%)。②流体包裹体和岩石地球化学参数显示烃气运移与3期热流体活动相关,每期热流体的活动深度及引起的热异常程度均存在一定差异。3期含烃热流体活动的时间分别为中新世晚期(约8.8 Ma)、上新世(约4.5~4.1 Ma)和第四纪(约1.1~0.1 Ma)。③热流体是以断裂为主要通道发生垂向高效快速充注。来自宝岛凹陷深部的幔源CO2在上新世晚期—第四纪(约2.2~0.5 Ma)发生充注,并驱替了陵水组储层的烃气。因此,宝岛凹陷Ⅱ号断裂带附近的圈闭可能具有钻遇高CO2含量的风险。
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