四川盆地东部下志留统龙马溪组页岩储层特征及影响因素

doi:10.3969/j.issn.1673-8926.2016.05.006

Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (5): 52-58.doi: 10.3969/j.issn.1673-8926.2016.05.006

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Shale reservoir characteristics and influencing factors of the Lower Silurian Longmaxi Formation in the eastern Sichuan Basin

Li Ke ^1，2，3， Wang Xingzhi ^1，2， Zhang Xingyi^1，2，3， Yao Jichao^1，2， Wu Qingmin^1，2

（1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University，Chengdu 610500， China； 2. School of Geoscience and Technology， Southwest Petroleum University，Chengdu 610500， China； 3. The Energy Security， Culture and Social Sciences Bases in
Sichuan Province， Chengdu 610500， China）

Online:2016-09-29 Published:2016-09-29

Abstract

Abstract:

The shale gas exploration of the Lower Silurian Longmaxi Formation in the eastern Sichuan Basin has achieved a major breakthrough, so the research of reservoir quality, especially the influencing factors of favorable reservoir deve?lopment, is significant for the next exploration of marine shale in Sichuan Basin. Based on core observation and rock slice identification, combined with scanning electronic microscope X?ray diffraction, this paper studied the reservoir characteristics of the Lower Silurian Longmaxi Formation in the eastern Sichuan Basin, and determined the main con?trolling factors for the formation of favorable reservoir. The minerals in the study area are mainly composed of quartz and clay minerals, with little calcite, dolomite and pyrite. Kerogen type is mainly sapropel（Ⅰ）, and humic?sapropel（Ⅱ1） comes second. The mass fraction of TOC is 0.10%?8.67%, and the average value is 1.49%. The Ro is 1.63%?2.81%, and the average value is 2.18%. Geochemical characteristics show a rich organic matter and high maturity. Reservoir space can be divided into two categories: pores and cracks, in which intergranular pores, organic pores and structural fractures are dominant. The shale reservoir development in the study area is affected by the sedimentary environment, shale brittleness, organic matter abundance and maturity.

Key words: pore characteristics, adsorption capacity, nonmarine shale, Chang 7 member, Ordos Basin

Li Ke， Wang Xingzhi， Zhang Xingyi， Yao Jichao， Wu Qingmin. Shale reservoir characteristics and influencing factors of the Lower Silurian Longmaxi Formation in the eastern Sichuan Basin[J].Lithologic Reservoirs, 2016, 28(5): 52-58.

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