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篇目详细内容 |
【篇名】 |
Unconformity structures controlling stratigraphic reservoirs in the north-west margin of Junggar basin, North-west China |
【刊名】 |
Frontiers of Earth Science |
【刊名缩写】 |
Front. Earth Sci |
【ISSN】 |
2095-0195 |
【EISSN】 |
2095-0209 |
【DOI】 |
10.1007/s11707-012-0344-9 |
【出版社】 |
Higher Education Press and Springer-Verlag Berlin
Heidelberg |
【出版年】 |
2013 |
【卷期】 |
7
卷1期 |
【页码】 |
55-64
页,共
10
页 |
【作者】 |
Kongyou WU;
Douglas PATON;
Ming ZHA;
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【关键词】 |
unconformity structural body; stratigraphic reservoir; key controlling factors; Jurassic bottom; north-west margin of the Junggar basin |
【摘要】 |
Tectonic movements formed several unconformities in the north-west margin of the Junggar basin. Based on data of outcrop, core, and samples, the unconformity is a structural body whose formation associates with weathering, leaching, and onlap. At the same time, the structural body may be divided into three layers, including upper layer, mid layer, and lower layer. The upper layer with good primary porosity serves as the hydrocarbon migration system, and also accumulates the hydrocarbon. The mid layer with compactness and ductility can play a role as cap rock, the strength of which increases with depth. The lower layer with good secondary porosity due to weathering and leaching can form the stratigraphic truncation traps. A typical stratigraphic reservoir lying in the unconformity between the Jurassic and Triassic in the north-west margin of the Junggar basin was meticulously analyzed in order to reveal the key controlling factors. The results showed that the hydrocarbon distribution in the stratigraphic onlap reservoirs was controlled by the onlap line, the hydrocarbon distribution in the stratigraphic truncation reservoirs was confined by the truncation line, and the mid layer acted as the key sealing rock. So a conclusion was drawn that “two lines (onlap line and truncation line) and a body(unconformity structural body)” control the formation and distribution of stratigraphic reservoirs. |
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