石油勘探与开发2017，Vol.44Issue(2)：196-204,9.DOI:10.11698/PED.2017.02.03
柴达木盆地西部地区致密油地质特征及勘探领域
Geological features and exploration fields of tight oil in the Cenozoic of western Qaidam Basin, NW China
摘要
Abstract
Using a large amount of drilling and experimental analysis data,this paper evaluates four potential fields of tight oil exploration in western Qaidam Basin from comprehensive analysis of geological conditions such as sedimentary environments,source rock evaluations,reservoir characteristics,and source-reservoir relationships.Influenced by continuous uplift of Tibet Plateau since Paleogene,the sedimentary environment of the western Qaidam Basin exibits three characteristics:(1) a paleo-topographic configuration consisted of irtherited slopes,depressions and paleohighs;(2) frequent alternation of relative humid and arid paleoclimate;and (3)oscillation of salinity and level of the paleo-lake water.Preferential paleo-environment resulted in two sets of large-scale source rocks with high efficiency and two types of large-scale tight reservoir rocks (siliclastic and carbonate),deposited during the late Paleogene to early Neogene.The above source and reservoir rocks form favorable spatial relationships which can be classified into three categories:symbiotic,inter and lateral.Based on sedimentary environments and reservoir types,tight oil resource in western Qaidam Basin can be divided into four types,corresponding to four exploration fields:salty lacustrine carbonate tight oil,shallow lake beach-bar sandstone tight oil,delta-front-sandstone tight oil and deep lake gravity-flow-sandstone tight oil.The temporal and spatial distribution of tight oil has characteristics of layer concentration,strong regularity and large favorable area,in which the saline lacustrine carbonate and shallow lake beach-bar sandstone tight oil are the best exploration targets in the western Qaidam Basin.关键词
致密油/地质特征/勘探领域/柴达木盆地/致密储集层Key words
tight oil/geological features/exploration fields/Qaidam Basin/tight reservoir分类
能源科技引用本文复制引用
刘占国,朱超,李森明,薛建勤,宫清顺,王艳清,王鹏,夏志远,宋光永..柴达木盆地西部地区致密油地质特征及勘探领域[J].石油勘探与开发,2017,44(2):196-204,9.基金项目
中国石油科技重大专项(2016E-0101 （）
2016B-0303) （）
