珠江口盆地文昌A凹陷深层珠海组不同构造单元油气充注期次及差异性分析
史肖凡 , 罗静兰 , 陈林 , 符勇 , 徐守立 , 严敏 , 刘芳
地球科学 ›› 2023, Vol. 48 ›› Issue (02) : 776 -792.
珠江口盆地文昌A凹陷深层珠海组不同构造单元油气充注期次及差异性分析
Hydrocarbon Charging Stages and Their Differences in Different Structural Units of the Deep Zhuhai Formation in Wenchang A Sag, Pearl River Mouth Basin
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珠江口盆地文昌A凹陷深部的古近系珠海组油气资源丰富,但不同区带油气成藏分布复杂,油气成藏时期的关键证据——包裹体的研究相对薄弱.为了准确厘定文昌A凹陷珠海组烃类充注时期,以研究区珠海组砂岩储层中的烃包裹体及其伴生盐水包裹体为研究对象,利用荧光光谱测定、激光拉曼光谱分析、显微测温等实验测试,结合包裹体捕获压力计算、埋藏史、热演化史、生烃演化史等分析,开展了凹陷中心及近珠三南断裂带油气成藏期次与差异性研究.结果表明,储层砂岩中烃包裹体及其伴生盐水包裹体成分主要为CH4、C2H6、CO2和H2O,同期盐水包裹体均一温度集中分布于95~180 ℃. 断裂带与凹陷中心均存在3期烃类充注,但油气充注时间有差别. 其中,凹陷中心第1期发生在21.9~13.9 Ma,第2期油充注发生在12.0~8.9 Ma,第3期油气充注时间7.8~4.8 Ma;断裂带第1期油充注发生在约21.7~10.2 Ma,第2期油充注发生在约9.1~4.9 Ma,第3期油气充注时间约为3.9~1.5 Ma.差异性构造沉降导致的烃源岩埋深的差异,以及多期断裂活动强度及其时空配置关系的不同,是造成凹陷中心及断裂带烃源岩生烃高峰的差异及油气成藏时间有先后之分的主要原因. 该结果为研究区油气勘探目标的选取与部署提供科学依据.
流体包裹体 / 油气充注时期 / 珠海组 / 古近系 / 文昌A凹陷 / 珠江口盆地 / 石油地质
fluid inclusion / oil and gas filling period / Zhuhai Formation / Paleogene / Wenchang A sag / Pearl River Mouth Basin / petroleum geology
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