川西坳陷与川中隆起过渡带油气勘探评价

Evaluation of hydrocarbon exploration in the West Sichuan depression and Central Sichuan uplift transitional zone

四川盆地川西坳陷与川中隆起过渡带是一个斜坡地带。通过对绵阳丰谷—中江回龙地区以上三叠统须家河组为目标层的勘探目标优选评价研究,证实了在该过渡带及其两侧具备有利的沉积和构造背景;存在有效的储集层和储集体;烃源岩生烃强度高,天然气资源潜力大;储盖组合配置良好;有多种类型的有效而适时的圈闭;天然气输导条件和保存条件有利。探讨了地层压力流体封存箱成藏可能是该过渡带的主要成藏模式,认为川西坳陷与川中隆起过渡带的须家河组具有良好的天然气勘探前景。

The West Sichuan depression and Central Sichuan uplift transitional zone in Sichuan Basin are slope zones. By evaluating and researching the exploration target optimization for the Upper Triassic Xujiahe Formation in Fenggu-Zhongjiang-Huilong areas, the authors have proved that there are favorable sedimentary and tectonic settings in the transitional zone and its two sides. The transitional zone is characterized by effective reservoir beds and reservoir bodies, high hydrocarbongeneration strength of hydrocarbon source rock, great potential of gas resource, good allocation of reservoir-seal assemblage, effective and timely traps with multiple types, favorable conductive and preservative conditions. This paper points out that the formation of the stratigraphic-pressure fluid compartment may be the main oil accumulation model of the “transitional zone”. Summarizing the above analyses, the Upper Triassic Xujiahe Formation in the West Sichuan depression and Central Sichuan uplift transitional zone is considered to have favorable exploration potential of natural gas.