摘要
利用地球化学测试资料,结合气田区构造演化和储盖发育特征,文中综合分析了油气充注历史,厘清了西湖凹陷T气田的油气分布特征及主控因素。研究表明:T气田的原油和天然气,是由气田区始新统平湖组烃源岩在低熟—成熟阶段生成的伴生油气;油气充注主要发生在上新世至今,平湖主断裂活动强度的差异性控制了气田区平面和纵向总体含油气面貌,直接盖层的埋深、厚度及封盖能力决定纵向上"上油下气"的分布格局;扩散为主的运移方式产生色层效应,导致原油和天然气的物理化学性质在纵向上有规律地变化。
Based on the geochemical test data and the tectonic evolution and reservoir-cap development characteristics of gas field, hydrocarbon filling history is comprehensively analyzed and the hydrocarbon distribution features and its main controlling factors of T gas field in Xihu Sag are clarified. Studies show that the oil and gas of T gas field are associated with each other, which came from the Pinghu formation#s low thermal evolution stage resource rock. Only one phase of hydrocarbon filling existed in T gas field, about from Pliocene epoch to now. The difference in the activity strength of Pinghu main fault controls the distribution of oil and gas on the whole. The buried depth, thickness and sealing ability of direct cap decide the vertical distribution pattern as ＂upper oil lower gas”. As the main migration pattern, the diffusion causes geochromatographic effects and results in the variation of the physical and chemical properties of oil and gas in the vertical direction.
作者
李宁
覃军
江瀚
赵洪
汤睿
LI Ning QIN Jun JIANG Han ZHAO Hong TANG Kui(Shanghai Branch of CNOOC Ltd., Shanghai 200335, Chin)
出处
《断块油气田》
CAS
北大核心
2017年第3期329-332,共4页
Fault-Block Oil & Gas Field
基金
国家科技重大专项课题"东海盆地天然气资源潜力评价"(2016ZX05027-001)
关键词
油气分布
主控因素
地球化学
西湖凹陷
hydrocarbon distribution
main controlling factors
geochemistry
Xihu Sag
