准噶尔盆地石炭系油气富集条件及有利勘探领域预测

Carboniferous Oil and Gas Abundance Conditions and Predicted Favorable Exploration Fields in Junggar Basin

准噶尔盆地石炭系的勘探始于20世纪50年代,截至2002年底,在盆地西北缘、东部和腹部共发现了5个含石炭系油藏的油田和1个气田。石炭系的储层主要是火山岩、火山碎屑岩。储集相带是近火山口的熔岩流亚相,次为爆发相,再次为火山重力流亚相。准噶尔盆地探明的石炭系油藏,多数受断裂活动的控制,可以划分为三类:断块油气藏、断裂—岩性油气藏和背斜油气藏。主要的储盖组合是以石炭系火山岩为储层,二叠系和三叠系泥岩为盖层。此外,该文总结了准噶尔盆地内石炭系油气富集规律,并评价出“7个区带”为有利勘探远景区。

Petroleum exploration of Carboniferous in Junggar Basin started from the 1950s. As of the end of 2002, five oil fields and one gas field of Carboniferous have been found on the northwestern periphery of the basin as well as the eastern part and the hinterland of the basin. The Carboniferous reservoirs are mainly volcanic rock and volcanic clastic rock. The reservoir facies is the subfacies of lava flow near volcanic mouth, then the eruptive facies and then the volcanic gravity flow subfacies. Most of the Carboniferous oil reservoirs proven in Junngar basin are controlled by the fault activities. They are divided into three categories: faulted block oil and gas reservoirs, fault-lithologic oil and gas reservoirs and anticline oil and gas reservoirs. As for the main reservoir-caprock assemblage, the Carboniferous volcanic rock is the reservoir while the Permian and Triassic mudstone is the cap rock. In addition, this thesis summarizes the Carboniferous oil and gas abundance law of Junggar Basin and assesses “seven playes” as favorable prospect areas for exploration.