Abstract
Current methods of evaluating the effects of gas reservoir exploitation primarily focus on evaluating production statistics of a well or field, and they often have a certain subjectivity. In order to further analyze key indexes that affect a gas reservoir during production, this paper considered the characteristic parameters of different types of gas reservoirs and established an index system of evaluating a gas reservoir “exploitation effect” from the three aspects of gas reservoir characteristics, rock characteristics, and economic benefits. There are numerous factors affecting the exploitation effect of a gas reservoir. The relationships between different factors are complicated, and the evaluation result of each factor can also be vague. A fuzzy optimization theoretical model for gas reservoir evaluation and optimization was established on the basis of a quantitative study on the evaluation parameters in fuzzy mathematics. In order to clearly understand the influence of each factor on the gas reservoir exploitation effect, numerical simulation was used to perform a multifactor numerical simulation study of the quantitative sensitivity to determine the sequence of different influencing factors in terms of influencing the gas reservoir exploitation effect. This study provides a quantitative scientific basis for the evaluation of gas reservoir exploitation effect.
Highlights
Due to complex geological conditions in China, low-quality reserves account for a higher proportion of the proven natural gas reserves. e exploitation with scale benefits is faced with long-term challenges
In order to clearly understand the influences of each influencing factor on the gas reservoir exploitation effect, the numerical simulation model was established by using the numerical simulation technology to preliminarily study the influencing rules
In order to further analyze key indexes that affect a gas reservoir during production, this paper considered the characteristic parameters of different types of gas reservoirs and established an index system of evaluating a gas reservoir “exploitation effect” from the three aspects of gas reservoir characteristics, rock characteristics, and economic benefits
Summary
Due to complex geological conditions in China, low-quality reserves account for a higher proportion of the proven natural gas reserves. e exploitation with scale benefits is faced with long-term challenges. In China, the quantitative analysis that couples natural gas exploitation technologies with economic situation is still lacking, and it is difficult to meet the demand for exploiting conventional and unconventional complex gas reservoirs under the new normal situation. Because there are numerous factors influencing this effect, the interactions and contradictions among the factors increase the difficulty of analysis It needs to be studied and determined by effective multi-index quantitative comprehensive evaluation methods. Wang et al [12] developed a set of key technical systems suitable for the efficient exploitation of complex tight sandstone gas reservoirs in the Yan’an Gas Field located in the southeastern Ordos Basin. Erefore, it is necessary to consider a variety of gas reservoir characteristic parameters and establish a comprehensive evaluation index system for gas reservoir development by combining statistics with the technical-economic coupling analysis method
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