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- Title
滨岸含砾砂岩层序地层, 沉积相及对优质储层 发育的控制作用 -以塔里木盆地 TZ2 井区为例.
- Authors
康婷婷; 赵凤全; 房 璐; 田浩男; 杨 果; 胡方杰; 亢 茜; 杨连刚
- Abstract
Great discoveries of oil and gas in Mahu area have set off a new wave of exploration for glutenite reservoir. Several oil and gas discoveries have been made in the“quartz gravel”reservoir of Donghe sandstone, Tarim Basin. The characteristics and distribution of the reservoir are basically clear. But the origin of gray gravel and its influence on the reservoir is still a study blank area. This paper, taking the pebbled sandstone section in Tazhong 2 well block, Tarim Basin as an example, explores this issue by employing high precision sequence stratigraphy controlled by coastal system. Based on thin section, core, well logging, and seismic data, the sedimentary environment and reservoir characteristics of the Carboniferous pebbled sandstone section in Tazhong 2 well block were studied, and then the influence of gray gravel on the reservoir and the division of reservoir in stratigraphic sequence and sedimentary facies sequence are explored, and the controlling effect of sequence deposition on effective reservoir distribution is summarized. The results indicate that it is a third-order sequence from the bottom of Donghe sandstone section to the top of Crumbs limestone section, which contains a transgression system tract and a highstand system tract cycle assemblage. The third-order sequence concludes four four-order sequence, and the pebbled sandstone section belongs to highstand system tract, which is a set of shore facies deposits controlled by transgression and denudation of Ordovician buried hill. The pebbled sandstone section develops foreshore subfacies and shoreface subfacies with the characteristic of large thickness variation and strong transverse heterogeneity, in which the foreshore subfacies is the favorable facies zone for reservoir development. Gray gravel is widely distributed in foreshore subfacies, and its parent rock is Ordovician limestone, which comes from the Ordovician buried hill with multi-stage uplift characteristics. The higher the content of gray gravel, the worse the physical property of the reservoir, which is the key factor affecting the development of effective reservoir.
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 5, p761
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.01.002