Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (1): 39-52.doi: 10.13278/j.cnki.jjuese.20160278

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Characteristics of Petrology and Pore Configuration of Lacustrine Source Rock Rich in Organic Matter from the First Member of Shahejie Formation in Bonan Sag, Zhanhua Depression: A Case Study on Well Luo 63 and Yi 21 Cored Interval

Li Zhiming1,2,3,4, Zhang Jun1,2,3,4, Bao Yunjie1,2,3,4, Cao Tingting1,2,3,4, Xu Ershe1,2,3,4, Rui Xiaoqing1,2,3,4, Chen Hongyu1,2,3,4, Yang Qi1,2,3,4, Zhang Qingzhen1,2,3,4   

  1. 1. Wuxi Research Institute of Petroleum Geology, RIPEP, SINOPEC, Wuxi 214126, Jiangsu, China;
    2. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi 214126, Jiangsu, China;
    3. State Energy Center for Shale Oil Research and Development, Wuxi 214126, Jiangsu, China;
    4. Key Laboratory of Petroleum Accumulation Mechanisms, SINOPEC, Wuxi 214126, Jiangsu, China
  • Received:2016-12-26 Online:2018-01-26 Published:2018-01-26
  • Supported by:
    Supported by National Key Basic Research Program("973" Program) of China (2014CB239101)and Projects of Science and Technology Development Section, SINOPEC(P12012, P14157)

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Abstract: The paper focuses on the petrology and pore configuration of lacustrine source rock rich in organic matter, on the basis of the analysis of whole rock and clay mineral X-ray diffraction, organic petrology, maturity, porosity, argon ion polishing+SEM, and MP, through a case study of the First Member of Shahejie Formation from Well Luo 63 and Yi 21 cored interval in Bonan sag, Zhanhua depression. The results show that the source rock rich in organic matter is mainly composed of carbonate minerals, clay minerals and quartz, with a little feldspar, pyrite and gypsum, and the clay minerals are consisted of mixed layer of illite/smectite, and illite. From the top to the bottom of the cored interval, the contents of carbonate minerals increase, the clay minerals and quartz decrease, and the lithologic character changes from the calcareous mudstone to the argillaceous limestone. The source rocks are layered, or laminar and block like. The average porosity of the source rocks from the Well Yi 21 and Luo 63 is 2.09% and 4.43% respectively, and the porosity of the source rock with laminar structure is relatively high. The pore types of the source rock rich in organic matter are dominated by mineral matrix pores (inter-particleand intra-particle) and fracture pores with no organic-matter pores. The pore radius is from several nanometers to several micrometers, dominated by macro-pore with its pore diameter larger than 50 nanometers.

Key words: mineral component, pore configuration, source rock rich in organic matters, Well Luo 63, Well Yi 21, First Member of Shahejie Formation, Bonan sag

CLC Number: 

  • P618.13
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