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Characteristics of Wufeng-Longmaxi Formations shale sweet layer：Case study of Weiyuan-Rongchang block of SINOPEC

Yang Zhen-heng，Han Zhi-yan，Tengeer，Xiong Liang，Shen Bao-jian，Zhang Qing-zhen， Shi Hong-liang，Wei Li-min，Li Yan-fang   

  1. 1.Wuxi Research Institute of Petroleum Geology，RIPEP，SINOPEC，Wuxi 214126，China；
    2.SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms，Wuxi 214126，China；
    3.Shale Oil and Gas Accumulation Mechanism and Effective Development of State Key Laboratory，Wuxi 214126，China；
    4.The State Energy Research and Development Center of Shale Oil，Wuxi 214126，China；
    5.Exploration and Development Research Institute of Southwest Oil & Gas Branch，SINOPEC，Chengdu 610041，China
  • Received:2019-03-04 Revised:2019-04-13 Online:2019-07-10
  • About author:Yang Zhenheng(1979-), Male, Senior engineer, Master, Mainly engaged in unconventional oil and gas research. E-mail：yangzh.syky@sinopec.com.cn.
  • Supported by:

    Supported by the?Major?Program?of?the?National?Natural?Science?Foundation?of?China(Grant No.41690133). the State?Key?Program?of?National?Natural?Science?of?China(Grant No. U1663202). The China National Science and Technology Major Project (Grant No. 2015ZX05061001).

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Abstract: Taking the typical core well of the Wufeng-Longmaxi formations in the Weiyuan-Rongchang shale gas block of the South Sichuan Basin as an example and based on the core observation，this study systematically evaluated the Wufeng-Longmaxi geological sweet section from petrology，mineral composition，organic geochemistry，hydrocarbon generation type and combination，physical property characteristics，pore type and gas content by using thin slices，argon ion polishing-scanning electron microscopy，physical property test，X-ray diffraction and geochemical analysis，on-site gas testing methods such as gas content analysis.The research shows that the lithology of geological sweet layer in Weiyuan-Rongchang area is mainly black carbonaceous shale and the stratum is developed.The carbonate mineral content of studied area is significantly higher than that in the Jiaoshiba area，the quartz mineral content is relatively low，and the organic carbon content is high.The evolution is at a stage higher than the mature stage and it generates large amount of hydrocarbons.It is rich in hydrocarbons such as graptolite，algae，sponge needles，and bacteria.The sweet layer well developed inorganic and organic pores.The inorganic pores are mainly composed of clay mineral pores，feldspar alterations and pyrite inter crystalline pores.These holes provide space for shale gas.In addition there is no large destructive fracture and destructive fluid activity，and the storage conditions are good.Therefore，the shale gas is enriched and preserved.Finally，it is reflected in the gas content，with the characteristics of high gas content and high initial dissipation rate，which provides a possibility for high yield and stable production.

Key words: Wufeng-Longmaxi shale, Sweet layer, Southern Sichuan, Hydrocarbon forming organisms, In-situ gas content, Initial dissipation rate

CLC Number: 

  • TE122.2+3
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