新疆石油地质

新疆石油地质 ›› 2002, Vol. 23 ›› Issue (1): 21-23.

• 油气勘探 • 上一篇    下一篇

塔里木盆地轮南下奥陶统沥青的发现及其意义

郭汝泰, 肖贤明, 王建宝, 刘德汉, 申家贵   

  1. 中国科学院 广州地球化学研究所 有机地球化学国家重点实验室,广东 广州 510640
  • 收稿日期:2001-06-05 出版日期:2002-02-01 发布日期:2020-07-31
  • 作者简介:郭汝泰（1965-）,男,山东人,高级工程师,博士研究生,研究方向为含油气系统。联系电话：020-85290714-196

The Discovery of Lower Ordovician Bitumen in Lunnan Low Uplift of Tarim Basin and Its Geologic Significance

GUO Ru-tai, XIAO Xian-ming, WANG Jian-bao, LIU De-han, SHEN Jia-gui   

  • Received:2001-06-05 Online:2002-02-01 Published:2020-07-31
  • About author:CUO Ru-tai(1965-),Male,Senior Engineer,Petroleum Geology,Stale Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong 510640, China

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摘要： 在塔里木盆地轮南低隆起某些井的下奥陶统碳酸盐岩储集层中发现有沥青,它主要充填在碳酸盐岩矿物晶间隙中,含量1%~3%,沥青反射率1.05%~1.10%.结合该区埋藏史及古地温史推算出原油沥青化形成时间发生在早海西运动期,结合油气地质背景,推断油气藏形成于晚志留世-早泥盆世时期。因此,这套储集层沥青是早古生代油气藏在早海西运动期经抬升、剥蚀、风化、氧化作用而发生沥青化,后经热变质作用而形成,它与塔北、塔中下志留统沥青砂岩属同时代产物,下奥陶统储集层沥青的发现扩大了早古性代古油气藏存在范围。对于认识轮南地区复杂的油气成因提供了新的证据。

关键词: 塔里木盆地, 轮南, 奥陶纪, 碳酸盐岩, 储集层, 沥青

Abstract: Reservoir bitumen have been found in Lower Ordovician carbonates from some wells in Lunnan low up-lift of Tarim basin. It occurred in the pores among mineral grams, with a content of 1%~3%. The measured reflectance of the bitumen ranges from 1.05% to 1.10%. With the combination of the burial history and palaeogeothermal evolution in this area,it is guessed that the bitumenization of the related crude oil took place at Early Hercynian,the oil reservoir was formed during Late Devonian to Early Carboniferous according to its petroleum geologic background. It is concluded that this set of reservoir bitumen was formed by the thermal maturation of bitumenized crude caused by denudation, weathering andoxidatjon owing to uplifting of this area during this period. The reservoir bitumen from the Lunnan low uplift has a similar origin with the Lower Silurian bitumen sandstones in Tabei uplift and Tazhong area. The discovery of the reservoir bitumen of Early Ordovician has extended the distribution of palaeo-oil and gas reservoirs of Early Paleozoic, and provided a new evidence for recognizing the complicated origin of oil and gas reservoirs in Lunnan area.

Key words: Tarim basin, Lunnan area, Ordovician, Carbonate rock, reservoir rock, bitume

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