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- Title
渝西大足区块五峰组-龙马溪组深层页岩 储层特征与勘探前景.
- Authors
张成林; 张鉴; 李武广; 田冲; 罗超; 赵圣贤; 钟文雯
- Abstract
In recent years,shale gas of Wufeng-Longmaxi Formations in Sichuan Basin has achieved economical developments on a large scale in middle-shallow reservoirs(vertical depth<3 500 meters),and gradually expanded to the deep reservoirs(vertical depth between 3 500 meters and 4 500 meters). It has made a preliminary progress in Dazu area of western Chongqing. Through analysis and evaluation of the hydrocarbon generation potential,reservoir pores,fracturing feasibility and gas content of shale in Dazu area,the study shows that compared with Changning and Weiyuan blocks,the O3w-S1l1-1 shale reservoir of Dazu is basically equal in brittle mineral and gas content,and is slightly weaker in organic matter abundance and porosity,which means the reservoir quality is comparatively excellent;There exist pore types including organic pores,intergranular pores,intragranular pores and microfissures,among which the proportion of intragranular pores is the largest. The fissure develops on a high level,while the concentration of fissure is the largest in the Wufeng Formation. By comprehensive research,it indicates that the O3w-S1l1-1 layers in Dazu area are characterized by large thickness of types Ⅰ + Ⅱ shale reservoir,and the Wufeng Formation shows great resource potential;the pressure factor is large and the preservation condition is excellent in this area;and it shows the enrichment and high yield mode of "matrix pores+fissures",which implies a bright future for the exploration and development of deep shale gas in that area.
- Subjects
SICHUAN Sheng (China); CHONGQING (China); OIL shales; SHALE gas; HYDROCARBON analysis; RESERVOIRS; SHALE; ORGANIC compounds
- Publication
Natural Gas Geoscience, 2019, Vol 30, Issue 12, p1794
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2019.08.007