川西盆地上三叠统须家河组隐蔽油气输导研究

Study on subtle hydrocarbon transport in the upper Triassic Xujiahe formation of west Sichuan Basin

在岩性地层和层序地层的对比和划分基础之上,对川西盆地上三叠统须家河组地层进行了隐蔽输导研究,认为工区内隐蔽油气输导途径主要有3种,分别为不整合面、连续的砂体地层和"亚前陆断裂带"。进一步分析了3类隐蔽输导的具体特征以及"亚前陆断裂带"的形成、发育过程及其对油气输导的意义。最后通过油气隐蔽输导以及地层、构造等研究,找到了两处油气聚集区域,从油气隐蔽输导方面给出了这两处油气聚集区油气运移的主要途径。

The upper Triassic Xujiahe formation in west Sichuan Basin has been studied for subtle transport based on lithologic and stratigraphic correlation and division.The study has identified three types of subtle hydrocarbon transport in this region,such as unconformity,continuous sand body and 'sub-foreland faulted zone'.The characteristics of the three types of subtle transport are analyzed.As a result,two hydrocarbon accumulations are found through studies of subtle hydrocarbon transport,stratigraphy and structure.The main hydrocarbon migration path of the two accumulations is presented in respect of subtle transport.