DISTRIBUTION AND KEY CONTROLLING FACTORS OF GIANT GAS FIELDS IN PASSIVE MARGINAL BASINS OF NORTHWEST AUSTRALIA
-
摘要: 以板块学说为理论基础,利用IHS能源信息库,在对澳大利亚西北大陆架被动大陆边缘盆地群原型盆地及古地理恢复基础上,从研究区20个大气田分布特征入手,剖析了其天然气富集的主控因素。认为晚石炭世—侏罗纪多期裂谷盆地控制了烃源岩的时空分布范围,其间大型海退型三角洲环境不仅带来了大量陆生腐植型有机质,而且提供了物性良好的储集砂体,同时裂谷期多期次继承性发育的大型垒式断块及背斜构造一直为天然气运聚的有利靶区。如果直接被后期白垩系被动漂移层系海相页岩高效封堵,能够形成大型天然气藏。该盆地群天然气剩余储量大、开发程度低;勘探领域广阔,预测>600 m深水裂谷层系将成为新的储量增长点。Abstract: Using the IHS energy information database, we reestablished the prototype basins of Australia northwest passive margin and its palegeography in this paper. The distribution pattern and key factors of 20 giant gas fields are studied. During C3-J periods, rifts controled the distribution of source rocks. Large scale of deltaic sedimentation in the interval not only brought in a great deal of Type III source rocks, but also provided the most important reservoirs. At the same time, some uplifts and anticlines were formed for accumulation of natural gas. If there is direct seals of marine Cretaceous shale, large gas fields will be formed. It is, therefore, concluded that there is great gas potential in this region.The rift sequence in deep water more than 600 meters is a promissing exploration target.
-
-
计量
- 文章访问数: 234
- PDF下载数: 4
- 施引文献: 0
下载: