海相油气地质Issue(2)：15-22,8.DOI:10.3969/j.issn.1672-9854.2014.02.003
塔里木盆地古城墟隆起奥陶系油气成藏特征及主控因素
Hydrocarbon Accumulation and Main Controlling Factors of Ordovician Reservoir in Guchengxu Uplift, Tarim Basin
摘要
Abstract
Guchengxu Uplift in which commercial oil and gas have been drilled out in Ordovician marine carbonate rocks in some wells in recent years has become one of the exploration focus areas in Tarim basin. Two series of Ordovician hydrocarbon-bearing reservoirs have b een confirmed to be present in Guchengxu Uplift, one is the limestone at the top of Ordovician Yijianfang Formation and the other is the limy dolostone of internal Ordovician Yingshan Formation. The hydrocarbon is present mostly in dry-gas state with normal pressure and high temperature in Ordovician reservoirs but exceptionally, light oil with low content of sulfur and wax which is characteristic of condensate oil are drilled out in the top of Yijianfang Formation in Well SN-1. Combined with the analysis of hydrocarbon property, biomarkers and hydrocarbon inclusion characteristics, it is suggested that two periods of hydrocarbon emplacement experienced in this uplift. Emplacing oil derived from the Cambrian to lower Ordovician source rocks in the first period of emplacement that occurred during the late Caledonian to Early Hercynian movements, and emplacing over-mature dry gas were dominated in the second period of emplacement that occurred during Himalayan movement. The following gas emplacement resulted in forming pure gas or condensate gas reservoirs. Different ranks of oil/gas shows are present in the drilled wells in Guchengxu Uplift, and specially all of oil and gas yielded are with no water. It is generally considered that high-quality carbonate reservoirs are the key for hydrocarbon accumulation and the developing NE-trending faults play an important role in hydrocarbon accumulation.关键词
塔里木盆地/古城墟隆起/奥陶系/油气成藏/油源对比/地球化学特征/主控因素Key words
Ordovician/Hydrocarbon accumulation/Oil-source correlation/Geochemical characteristics/Guchengxu Uplift/Tarim Basin分类
能源科技引用本文复制引用
沙旭光,马庆佑,吕海涛,李晓益,朱秀香..塔里木盆地古城墟隆起奥陶系油气成藏特征及主控因素[J].海相油气地质,2014,(2):15-22,8.基金项目
本文受国家科技重大专项专题“塔里木盆地中央隆起区海相碳酸盐岩层系油气成藏主控因素与勘探突破目标评价”（编号：2011ZX05005-004）资助 （）
