| 柴达木盆地北缘上三叠统—侏罗系层序特征与含油气系统划分 |
| 修订日期：2001-07-18 |
| 关键词:northern Qaidam Basin Late-Triassic Jurassic stratigraphic sequence petroleum system |
| 基金项目:中国石油天然气股份有限公司“新盆地、新层系、新领域研究和科探井的选择与实践”项目的成果(95-81-1C) |
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| 摘要: |
| Characteristics of Stratigraphic Sequence and Classification of Petroleum Systems in the Nothern Qaidam Basin |
| Based on the theory of stratigaphic sequence,this paper divides the Late Triassic and Jurassic strata into 5 sequences and 12 system tracts of sequence Ⅱ and sequence Ⅲ is the main source rock in the northern Qaidam Basin.Through tracing seismic profiles,the distribution of source rocks is delineated,that is,Lenghu Nanbaxian structural zone is the boundary of Lower Jurassic (sequence Ⅱ) and Middle Jurassic (sequence Ⅲ).The research results of seismic facies and sedimentary facies indicate that the transgressive system tract of sequence Ⅱ develops extensive shallow lake and swamp facies,with small deep lake facies in the deep center,and the transgressive system tract of sequence Ⅲ develops semi deep lake facies only in Yuka sag.Based on the esearch results of stratigraphic sequence and sedimentary facies,this paper defines the oil generating centers.In addition,according to the distribution characteristics of souce rocks,the northern Qaidam Basin is divided into J1(!) R petroleum system and J2(!) E petroleum system.J1(!) R petroleum system is a petroleum system of intermediate abundance,around which Kunteyi structure,Lenghu No.7 structure and Yikeyawuru structure are favorable traps.The distribution and the thickness of J2(!) E petroleum system are limited,and hence the traps around this petroleum system have relatively small exploation potential. |
| YANG Yong-tai,LIU Gui-xia,JIA Xing-you,GUAN Jun-ya.2002.Characteristics of Stratigraphic Sequence and Classification of Petroleum Systems in the Nothern Qaidam Basin[J].Acta Geoscientica Sinica,23(1):67-72. |
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