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Identification of Low-Permeability Gas-bearing Formation Using Conventional Logging Data

Author: DongRuiXia
Tutor: FanXiaoMin
School: Jilin University
Course: Earth Exploration and Information Technology
Keywords: Low permeability reservoir Conventional logging Statistical Analysis Principal component analysis Discriminant index
CLC: P631.8
Type: Master's thesis
Year: 2004
Downloads: 780
Quote: 1
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Abstract


Chinese conventional reservoirs reservoirs limited number of conventional high permeability reservoirs in exploration and development is becoming more and further tap the potential is very difficult, so people began to attach importance to low-permeability oil and gas field exploration and development. According to statistics, unconventional resources in low permeability reservoir reservoir for about half of the total amount of resources. Ordos Basin and northern Tabamiao southern Songliao Basin depression belong SHIWU low permeability tight sandstone gas reservoirs. For the Upper Paleozoic low permeability gas reservoirs, the paper carried out several applied research, the core content is how to use conventional logging data, using various means to effectively identify gas layer, low permeability gas reservoirs correctly evaluation. By logging, core and other data analysis showed that: reservoir properties are the main factors controlling gas porosity calculation of reserves is an important parameter of the second chapter describes how to use the data to determine the porosity of conventional logging methods. In actual processing, the comprehensive comparison of all logs and core analyzes the correlation between porosity and found sonic, density, compensated neutron porosity logging in reflecting different aspects of the response characteristics, the final core of the pore degree on slowness curves and density logs calibrated by regression analysis to establish a regional porosity logging interpretation model, and carried out significant test. Ordos Basin Tabamiao Xiashihezi and Shanxi different intervals conduct a detailed study on the regression results are analyzed. Use this method to establish the interpretation of model processing dozens of wells in the area, explain the conclusion in good agreement with the test results. Grouping segments created using the log interpretation model does not take into account various logs reservoir \study of the main factors and lithology, gas and other factors changes in the relationship. PCA basic idea of ??the complex correlation from the plurality of characteristic parameters extracted logging best reservoir characteristics reflect non-correlation new variable (or main component), and these amount of information contained in the main component are arranged in descending order, the first principal component contains the most information, the more backward the main component contains less amount of information. Thus, the general secondary information can be ignored, just extract the main principal components can be effectively integrated reflect the situation. Principal component analysis method Tabamiao North Ordos Basin logging data segments comprehensive evaluation found that the main factor in logging curve can reflect lithology, gas and other stratigraphic information. lt; WP = 99 gt; conventional logging data applications in the traditional porosity, permeability and saturation calculations have been breakthroughs toward utilization of various logging data for fine reservoir evaluation trend. Each log response contains a different fluids from the formation, the contribution of different lithologies, the key is how to build an appropriate model, and these various log responses to be extracted from the comprehensive utilization of the fine for the evaluation of reservoir the means to provide more and richer information. And the reservoir is a heterogeneous body, affected by a variety of complex geological factors control many parameters, various features of the relationship between the parameters is more complex. Research and application of qualitative characteristic parameters of reservoir description for reservoir evaluation, research and development on low permeability gas reservoirs of great significance. This paper presents the discriminant index method is to fully extract all the information contained in the gas well logging information, they are organically integrated together to arrive at a comprehensive gas-bearing strata indicator approach. This method tight sandstone reservoir in southern Songliao Basin Evaluation achieved good effect, through the focus of the area 18 old wells recognition processing, compared to giving explanations conclusion in good agreement with the test results, the old secondary exploration wells developed to provide a guarantee.

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Underground geophysical
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