Exploration potential of marginal sags in the Pearl River Mouth Basin: An example from the Xijiang 36 Sag
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摘要:
近几年的研究与勘探实践表明，部分边缘洼陷同样具备较好的油气成藏条件与勘探潜力。南海北部珠江口盆地发育大量低勘探程度的边缘洼陷，系统梳理这些洼陷的结构、构造演化和成藏条件具有重要实践意义。本文以珠江口盆地边缘洼陷西江36洼为例，基于重处理三维地震、测井和地球化学等资料，开展洼陷结构演化研究、原型盆地恢复、地震相对比和油气运移分析，系统梳理了西江36洼的洼陷结构、烃源潜力和成藏特征。研究表明：① 西江36洼受NE向断层控制，为“南断北超”的箕状断陷湖盆；② 西江36洼发育一定规模的中深湖相烃源岩且已经成熟，具备较好烃源条件；③ 受区域泥岩盖层和油源断层断距的影响，西江36洼具有深层古近系近源成藏的特征，宜围绕古近系构造、地层和岩性圈闭勘探。该研究认识有助于推动西江36洼的勘探进程，并为其他边缘洼陷的油气勘探提供借鉴。
Abstract:Research and exploration in recent years show that some marginal sags also hold good hydrocarbon accumulation conditions and exploration potential. The Pearl River Mouth Basin, northern South China Sea, have many marginal sags in low exploration degree, and it is of great significance to systematically sort out the structure, tectonic evolution, and accumulation conditions of these marginal sags. Taking the Xijiang 36 Sag as an example, we analyzed the tectonic evolution, prototype basin restoration, seismic facies comparison, and oil and gas migration using 3D seismic, well logging, and geochemistry data, based on which the structure, hydrocarbon source potential, and accumulation characteristics of the Xijiang 36 Sag were systematically researched. Results show that (1) Xijiang 36 Sag was a half-graben rift lake basin controlled by an NE-striking fault in the south and structural overlapping in the north; (2) Xijiang 36 Sag holds a certain scale of medium-deep lacustrine facies source rock, and is mature with good hydrocarbon accumulation conditions; (3) affected by the regional mudstone caprock and the fault throw of the source fault, Xijiang 36 Sag was characterized by deep Paleogene near-source accumulation. Therefore, we suggest the Paleogene structure, stratigraphy, and lithologic trap are the main target for further exploration. This research helps to promote the exploration process of the Xijiang 36 Sag and provides a reference for oil and gas exploration in other marginal sags in the Pearl River Mouth Basin.
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Key words:
- marginal sag /
- sag structure /
- tectonic prototype /
- seismic facies /
- source rock /
- exploration potential
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