松辽盆地南部乾安地区上白垩统青三段高分辨率层序地层及沉积特征

发布时间：2018-04-27 23:18

本文选题：松辽盆地 + 乾安地区　；参考：《古地理学报》2017年02期

【摘要】：综合利用岩心和测井资料,系统总结了松辽盆地南部乾安地区上白垩统青山口组三段高分辨率层序界面的识别标志,建立了高分辨率层序地层格架,对高分辨率层序地层格架内地层叠置特征进行了探讨,并进一步分析了层序地层格架内河道砂体展布特征及沉积相演化规律。识别出冲刷面、底部滞留沉积和滑塌沉积3种高分辨率层序界面识别标志,以及泥岩颜色转换和含油性变化2类辅助性证据,在此基础上将青三段划分为2个三级层序(SQ1,SQ2)、13个四级层序(HFSQ1-HFSQ13),层序内可进一步划分出湖侵体系域(LTST)和湖退体系域(LRST)。四级层序体系域内识别出单向加深A1型、单向加深A2型、单向变浅B型、复合对称C1型和复合对称C2型共5类四级层序结构;三级层序湖平面升降可划分为4个阶段,各阶段内四级层序组合模式各不相同。根据砂体连井对比和平面相分析成果,结合体系域阶段划分,在研究区青三段高分辨率层序地层格架内共总结出4类沉积模式。其中,湖退体系域早期沉积模式砂体分区叠置,河道平面呈分支树杈状。湖退体系域晚期沉积模式砂体规模最大,整体连片叠置,河道平面呈网络交织状,分流河道间湾在河道间呈零星点状分布。湖侵体系域早期沉积模式砂体规模较小,孤立分布,河道平面呈分支树杈状。湖侵体系域晚期沉积模式砂体规模最小,零星分布,河道平面呈曲流状—分支树杈状。
[Abstract]:Using core and logging data, the identification marks of the high resolution sequence interface between the three segments of the upper Cretaceous Qingshankou Formation in the southern Songliao Basin and the high resolution sequence stratigraphic framework are established. The stratigraphic structure of the high resolution sequence stratigraphic framework is discussed and the sequence stratigraphic framework is further analyzed. The characteristics of the sand body distribution and the evolution of sedimentary facies of the inland river channel identified 3 high resolution sequence identification marks for the scour surface, the bottom retention deposit and the slump deposition, as well as 2 kinds of auxiliary evidence for the mudstone color conversion and oil-bearing change. On this basis, the green three segment was divided into 2 three order sequences (SQ1, SQ2), and 13 four sequence sequences (HFSQ1-HFSQ13 In the sequence of sequence, the transgressive system tract (LTST) and the lake retreat system tract (LRST) can be further divided. The four sequence system domain recognizes one way deepened A1 type, unidirectional deepened A2, unidirectional and shallow B, compound symmetric C1 and compound symmetrical C2 type 5 class sequence structure, and the three sequence lake level rise and fall can be divided into 4 stages and four layers within each stage. There are 4 types of depositional patterns in the high resolution sequence stratigraphic framework of the Qing three section of the study area, according to the results of the comparative peaceful facies analysis of sand body wells and the stage division of the system domain. The sand body of the sedimentary model is the largest, the whole cascade is stacked, the channel plane is interwoven with network, the distributary channel Bay is scattered in the channel between the channels. The early sedimentary model sand body of the lacustrine transgressive system domain is small, isolated and branched, and the sand body of the late deposition model of the lacustrine system domain is the smallest, sporadic distribution of the river. The plane of the canal is curved - branched - branched.

【作者单位】：中国石油大学(北京)地球科学学院;中国石油大学(北京)油气资源与探测国家重点实验室;中国石油天然气股份有限公司吉林油田分公司扶余采油厂;中国石油集团川庆钻探工程有限公司长庆井下技术作业公司;
【基金】：国家科技重大专项(编号:2011ZX05004-004-007)资助~~
【分类号】：P618.13;P534.53

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