摘要
通过对4口钻井、4条地表剖面的地层沉积详细描述及相应的3000余块储层浅钻样品和近万个岩矿分析测试数据等翔实资料的分析认为,库车坳陷下侏罗统发育辫状三角洲沉积体系,三角洲平原的辫状分流河道和三角洲前缘的水下分流河道是主要的储集砂体。这套储层以吐孜洛克地区为界,东、西两区在成岩作用、储集性质和成因机制上均存在显著差异。经研究表明,砂岩粒径、地层埋藏史和构造侧向挤压是引起此差异的关键控制因素;时间域上主要表现为砂岩粒径对储集性质的影响,而空间域上储层特征的显著差异受控于地层埋藏史和构造侧向挤压。
On the basis of detailed stratigraphic sedimentary description, as well as about 10000 analytic data and 3000 shallow-drilling reservoir samples from 4 outcropped profiles and 4 wells, it is believed that a braided delta depositional system was well developed in the Lower Jurassic. The major reservoir sand bodies are braided distributary channels of delta plain subfacies and subaqueous distributary channels of delta front subfacies. With the Tuziluk area as the boundary, the eastern and western parts of this suite of reservoirs are notably different in diagenesis, properties and forming mechanisms of the reservoirs. This research shows that the grain size of sandstone, stratigraphic burial history and lateral tectonic compression are the critical factors causing the difference. In time domain, the grain size of sandstone affects the reservoirs, while in space domain the remarkably difference of reservoir properties is controlled by the stratigraphic burial history and lateral tectonic compression.
出处
《地质论评》
CAS
CSCD
北大核心
2001年第3期272-277,共6页
Geological Review
基金
国家重点基础研究发展规划项目"中国典型叠合盆地油气形成富集与分布预测"(编号G1999043303)资助成果
