Advances in Earth Science ›› 2016, Vol. 31 ›› Issue (10): 1056-1066. doi: 10.11867/j.issn.1001-8166.2016.10.1056

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Logs Fluid Typing Methods and Adaptive Analysis of Tight Sandstone Reservoir of Yingcheng Formation in Lishu Fault

Keyu Mao( )   

  1. Logging Company of Shengli Petroleum Engineering Company, Sinopec, Dongying 257096,China
  • Received:2016-07-30 Revised:2016-09-20 Online:2016-10-20 Published:2016-10-20
  • About author:

    First author:Mao Keyu(1963-), male, Luoyang City, He’nan Province, Senior engineer. Research areas include geophysical well logging interpretation.E-mail:mkymsj@163.com

  • Supported by:
    Project supported by the National Science and Technology Major Project of the Ministry of Science and Technology of China “Development of major oil & gas fields and coal bed methane”(No.2016ZX05014-001)

Keyu Mao. Logs Fluid Typing Methods and Adaptive Analysis of Tight Sandstone Reservoir of Yingcheng Formation in Lishu Fault[J]. Advances in Earth Science, 2016, 31(10): 1056-1066.

Tight clastic reservoirs are characterized with low porosity and low permeability, which reduce contributions of reservoir fluids to geophysical logging responses, and it is more difficult to identify fluids of the reservoir. Therefore, it is necessary to study log interpretation and comprehensive evaluation methods for such clastic reservoirs. This study focused on geological characteristics of tight clastic reservoir of Yingcheng formation in Lishu Fault. Based on logs sensitivity to fluids, some fluid typing methods were discussed in detail, which included log curve overlap method, acoustic time overlapping method from density and neutron logs, porosity difference and ratio method, porosity-resistivity crossplot, normal distribution method, and other methods, and some effective fluid evaluation method were established and optimized. These above-mentioned methods were verified, which could achieve layer qualitative identification of tight sandstone in the study area. By contrast, two logs overlapping methods, porosity difference and ratio method, resistivity-porosity crossplot are more suitable for natural gas reservoirs, while porosity difference and ratio method, porosity-resistivity chart, normal distribution method are more suitable for oil and water reservoirs. The case study suggests that these methods be combined to archive more correct log interpretation in the study area, which provides important decision-making reference for oilfield exploration and development.

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