摘要
野外剖面及系统井间对比表明,准噶尔盆地白垩系底砾岩主要分布于盆地边缘及中央低凸起周围,是一套形成于邻近高地附近的剥蚀产物或冲积产物。白垩系底砾岩的分布特征显示晚侏罗世—早白垩世早期构造活动较为活跃,盆地边界发生明显萎缩,天山山脉发生明显隆升,造成天山南北早白垩世沉积环境的巨大差异。白垩系底砾岩的成因与相关油气藏的形成关系密切,与砾岩相伴生的砂岩可以构成良好的油气储层,形成多种类型油气藏。白垩系底砾岩的形成时期(晚侏罗世—早白垩世早期)构造活动较为活跃,是油气成藏的关键时期,对与侏罗系煤层相关的气藏形成具有重要意义。
Based on study of outcrops and systematic well-to-well correlation, Cretaceous basal conglomerates in the Junggar basin is mainly distributed on the margin and around the central low salient of the basin, and are the products of denudation or alleviation formed near the adjacent highland. The distribution characteristics of Cretaceous basal conglomerate reveal that tectonic movements were active in Late Jurassic-Early Cretaceous, the boundaries of the basin obviously depauperated while the Tianshan Mountain remarkably uplifted, resulting in the big differences of Early Cretaceous sedimentary environments in south and north Tianshan Mountain. The genesis of Cretaceous basal conglomerate is closely related with the formation of relevant oil/gas reservoirs and the sandstone associated with the basal conglomerate can consist of good oil/gas reservoirs, leading to the formation of various oil/gas pools. Tectonic movements were active during the formation of Cretaceous basal conglomerate, i.e. Late Jurassic-Early Cretaceous, which was a critical stage for oil/gas reservoiring and was of great significance to migration and accumulation of oil and gas, especially to the formation of gas reservoirs associated with Jurassic coal beds.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2006年第5期13-16,共4页
Natural Gas Industry
基金
中国石油集团公司中青年石油科技创新基金(编号:05E7036)
中国博士后科学基金(编号:2005037101)
"十五"国家重点科技攻关项目(编号:2004BA616A-04)联合资助。
关键词
准噶尔盆地
白垩纪
底砾岩
成因
油气藏形成
关系
Junggar basin, Cretaceous, basal conglomerate, genesis, oil/gas reservoiring
