Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (3): 724-735.doi: 10.13278/j.cnki.jjuese.201503107

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Sequence Stratigraphy Characteristics and Its Control Action on Sedimentary and Source Rock in Shahezi Formation of Zhaozhou Area in Songliao Basin

Cai Laixing1, Lu Shuangfang2, Li Ang1, Shi Lei1, Liu Shuang2   

  1. 1. College of Earth Sciences, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    2. Research Institute of Unconventional Petroleum and Renewable Energy, China University of Petroleum(East China), Qingdao 266580, Shandong, China
  • Received:2014-09-03 Published:2015-05-26

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Abstract:

Based on Vail's sequence stratigraphy theory,the sequence stratigraphy framework of Early Cretaceous Shahezi Formation in Zhaozhou area in Songliao basin is established through the study of cores,seismic data,logging data, and other materials. Shahezi Formation is one second grade sequence, and it includes four third grade sequences from the bottom to the top,SQ1-SQ4. Each third grade sequence develops dichotomy structure,transgressive system tract, and regressive system tract. Among them,Top SQ4 suffered serious erosion, its transgressive system tract exists only in the basin margin. Based on the contrast of the sequence stratigraphic division,combined with the background of the tectonic activity,source supply, and the other conditions in the study area,three types of sedimentary facies were developed in Shahezi Formation:fan delta in the west, braided river delta in the east, and lake facies. The sedimentary evolution was mainly controlled by the development of the sequence stratigraphy as described:"stratigraphic control sand body,sedimentary facies development inheritance,sedimentary deposits from different provenance and development regionally". In the development of SQ1 and SQ4,the basin was small and water was shallow. The lobate fan delta and the braided river delta distribute in a small range,the content of shale is low and the abundance of organic matter is poor; while in the stages of SQ2 and SQ3,both water and other source supply entered adequately into the lake basin, this resulted in the contiguous development of the fan-shaped body (lake facies?), in which the dark mudstone is large and thick with abundant organic matter. In addition, the underwater distributary exists as the main sand body in the leading edge subfacies. In such a sedimentary environment, two sets of optimal hydrocarbon source rocks were developed during the largest lake flooding period in SQ2 and SQ3.

Key words: Zhaozhou area, Shahezi Formation, sequence stratigraphic framework, sedimentary characteristics, source rocks, controlling action, Songliao basin

CLC Number: 

  • P618.13

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