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The Research on Well Logging Interpretation Methods for the Shanxi Formation and He8 Member in upper Paleozoic of Yan’an Area in the Ordos Basin

Author: LiXiangLing
Tutor: MiaoJianYu
School: Northwestern University
Course: Solid Geophysics
Keywords: Yan'an field Shanxi Formation reservoir Box 8 of the reservoir Sedimentary facies Reservoir characteristics Log interpretation methods Reservoir parameter calculation
CLC: P618.13
Type: Master's thesis
Year: 2009
Downloads: 433
Quote: 1
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Abstract


Yan'an gas field in the Ordos Basin in recent years as a major breakthrough in gas exploration. In order to find out the gas reservoirs of the region logging data response characteristics, regional gas reservoir characteristics, with the next step of a comprehensive exploration and development of the region, expand the region logging data, log interpretation methods work extremely urgent, particularly important. The author of the sedimentary rock theory, drawing on previous experience, field outcrop, core analysis data, logging data response characteristics based on re-defining the stratigraphic sequence of the study area, summed up the Shanxi Formation the box of Xiashihezi < sub> reservoir sedimentary facies and microfacies types, for an accurate understanding of reservoir laid the foundation. The study showed that: the Shanxi Formation meandering river delta deposition, the box 8 paragraph for the deposition of braided river delta. Macro sedimentary facies identified under the guidance of the use of core analysis, casting thin and mercury intrusion data Shanxi Formation, the Shihezi group the box 8 reservoir characteristics carried out a detailed study. Reservoir pore structure of the study, in addition to the commonly used pressure mercury experimental analysis of information, the use of the new technology of nuclear magnetic resonance logging pore structure analysis. Have a clear understanding of reservoir characteristics based on systematic research Shanxi Formation, the the Shihezi group the box 8 paragraph lithology, physical property, logging response characteristics and gas-bearing characteristics, developed a new method for logging electrical characteristics of lithology identification, proposed a new method of use of the the photoelectric index and natural gamma lithology identification. In order to accurately strike a reservoir parameters, fine, layered bit, sub-lithological interpretation of the laws of the region, the use of core analysis data return a different block hole, seepage, saturated formula. And its accuracy has been verified. The results show that: the formula high reliability, to meet the needs of log interpretation. Secondly, participated in the study logging data and core sheet data are standardized to ensure the data is reliable, accurate, and laid the foundation for the accurate calculation of the reservoir parameters. Order to accurately sentenced knowledge of gas-water layer, the cross plot method to determine the lower limit of the gas-water layer on the the Yan'an field Shanxi group, the box 8 reservoir gas, gas and water layer, poor gas, the lower limit of the dry layer was studied, and the conclusion was verified. By paragraph the Yan'an field Shanxi group box 8 GEOPHYSICAL the for Yan'an field the logging interpretation model, core analysis and test gas was verified, the results logging parameters show that the strike formula reliable, practical and give a true picture of the reservoir characteristics.

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