SOURCE ROCK THERMAL AND MATURITY HISTORY MODELING IN C SAG OF THE WEIXINAN DEPRESSION, BEIBUWAN BASIN
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摘要: 北部湾盆地涠西南凹陷C洼流沙港组烃源岩热史及成熟史研究,对C洼深水油气勘探具有指导意义。在恢复涠西南凹陷C洼地史和热史的基础上,利用EASY% Ro模型计算了流沙港组烃源岩的成熟度史。研究结果表明,在涠西南凹陷发展的裂陷阶段初始期热流值较高,最大值约为77 mW/m2,其后热流值逐渐减小,现今热流值约为54 mW/m2;涠西南凹陷C洼流沙港组烃源岩开始生烃(Ro=0.5%)时间为51 MaBP,达到生烃高峰(Ro=1%)时间为42 MaBP,达到高成熟演化阶段(Ro=1.3%)时间为17 MaBP;对比涠1井流沙港组烃源岩演化特征,处于C洼深水勘探区的流沙港组烃源岩成熟度较高,生烃能力较强,拥有广阔的油气勘探前景。Abstract: It is significant to study the source rock maturity history in the C sag of the Weixinan depression for the deep water exploration in this area of Beibuwan basin.Based on geohistory and thermal history of the C sag,the source rock maturity history of the sag is reconstructed with the usage of Easy%Ro model.The studies indicate:(1) In the early rifting stage,the heat flow in the C sag of the Weixinan depression reached the maximum(77 mW/m2), then decreased gradually and is about 54 mW/m2 at present. (2) The Liushagang Formation source rock in the C sag began to generate hydrocarbon (Ro=0.5%) at about 51 Ma,reached the hydrocarbon generation peak(Ro=1%) at about 42 Ma, and the high maturity (Ro=1.3%) at about 17 Ma. (3)Comparatively,maturity of the Liushagang Formation source rock of Well Wei1, in the deep water exploration area is higher and the hydrocarbon generation capacity is stronger,so the deep water exploration area has more cheerful prospect.
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Key words:
- burial history /
- thermal history /
- maturity history /
- basin modeling /
- Weixinan depression
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