摘要
吐哈盆地台北凹陷西部是吐哈油田分公司"九五"以来增储上产的主战场,相继发现了八个含油气构造带。通过对台北凹陷东西部侏罗系烃源岩的差异性分析,对台北凹陷西部原油进行了族群划分,认为台北西部原油可分成三个群组,分别对应以七克台组湖相泥岩为母源的"A"类原油、以水西沟群煤岩为母源的"C"类原油和以水西沟群煤系源岩复合成烃的"B"类原油。各类原油由于其母源成熟度和大量生排烃期的差异,导致其成藏期不同,以水西沟群煤系源岩为母源的油藏成藏期大都在晚燕山期,而以七克台组为母源的油藏其成藏期多在喜山期。
West Taibei sag in Tuha basin is the main prospective area during the'Ninth Five'period,in which eight oil- bearing structures have been discovered consecutively.Based on the analysis of different Jurassic source rock, the crude oil produced in West Taibei sag was classified into three groups:the crude generated from the lacustrine mudstone of Qiketai formation was classified as type A,that generated from the coal of Shuixigou formation as type C,and that generated from composite coal measure source rock of Shuixigou formation as type B.These three types of crude oil have different reservoir generation stages due to different maturity of their source rock and different hy- drocarbon generation and expulsion stage.The generation stage of those reservoirs whose source rock are coal meas- ure strata of Shuixigou formation was late Yanshanian,and the generation stage of those whose source rock are the Qiketai formation was Himalayan.
出处
《吐哈油气》
2002年第1期1-4,95,共5页
Tuha Oil & Gas
关键词
吐哈盆地
原油族群
显微组分
地球化学特征
成藏期
Tuha basin
groups of crude oil
microscopic composition
geochemical characteristics
reservoir generation stage
