收稿日期: 2005-01-12
修回日期: 2005-02-18
网络出版日期: 2005-04-20
基金资助
国家重点基础研究发展计划(“973”计划)项目(编号：2003CB214602)；陕西省自然科学基金项目(编号：2003D14)；陕西省教育厅科学研究专项计划项目(编号：03JK09 5)联合资助.
SEQUENCE STRATIGRAPHY OF YANCHANG FORMATION IN ANSAI DISTRICT
Received date: 2005-01-12
Revised date: 2005-02-18
Online published: 2005-04-20
运用层序地层学原理,结合野外剖面和钻井资料,根据不同的层序界面,将安塞地区延长组划分为4个层序,自下而上为S1、S2、S3和S4。除了S4的高位体系域因剥蚀而缺失外,其它层序均由低位、水进和高位体系域组成。各层序呈现不同的堆砌样式。研究区的层序对于生储盖的组合及储层的展布以及储层的储集性能均有一定的控制作用。因此,位于最大湖进面的长7张家滩页岩成为主要的生油层;处于水进体系域的长9、长4+ 5和长1湖相泥岩既具有一定的生油能力,同时又可作为盖层;位于低位体系域的长6、长2和长3油层组是良好的储集层,而同处于低位体系域的长8油层组则是研究区的下一个勘探目的层.
吴志宇,赵虹,李文厚,李强 . 安塞地区延长组层序地层特征[J]. 天然气地球科学, 2005 , 16(2) : 190 -193 . DOI: 10.11764/j.issn.1672-1926.2005.02.190
By applying of sequence stratigraphy principle, connecting with the data of outc rop and core, the strata in Yanchang formation in Ansai district have been divid ed into S1, S2, S3 and S4. Beside the S4 which lost the highstand system tract ( HST), the others possess the lowstand system tract (LST), the transgressive syst em tract(TST) and the HST. Every system tract is made of different stratigraphic pattern. The sequences in studying area control the assemblage of source, reser voirs and caps and the distribution of reservoirs as well as the performance of reservoirs. So Chang 7 that lie in the maximum flooding surface is the main sour ce rock. Chang 9, Chang 4+5 and Chang 1 that lie in the TST either have the abil ity of producing oil or can became the caps. Chang 6, Chang 3 and Chang 2 that b elong to the LST possess good reservoirs. Chang 8 lie in the LST will became the next exploration aim.
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