Application of analytic hierarchy process in the construction of evaluation indicator system for tight oil geological and engineering double sweet spots and its validations through actual drilling

LIU Huiming

doi:10.3969/j.issn.1672-9803.2024.04.008

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Mud Logging Engineering ›› 2024, Vol. 35 ›› Issue (4) : 48-55. DOI: 10.3969/j.issn.1672-9803.2024.04.008

Application of analytic hierarchy process in the construction of evaluation indicator system for tight oil geological and engineering double sweet spots and its validations through actual drilling

LIU Huiming

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Abstract

In recent years, the importance of engineering sweet spots has become increasingly prominent, but the development of tight oil still focuses on geological sweet spots, which greatly limits the recoverable areas of oil reservoirs. Even though the concept of engineering sweet spots is considered in the development of tight oil, how to organically combine geological sweet spots with engineering sweet spots and conduct integrated evaluation is still a difficult problem. In order to evaluate the geological and engineering double sweet spots of tight oil, an indicator system including geological and engineering double sweet spot evaluation indices is first constructed. Then, the analytic hierarchy process is applied to determining the weight of each indicator in the indicator system and calculating the evaluation indices of the geological and engineering double sweet spots based on the indicator weights. Taking Jilin Oilfield as an application example, this paper presents how to use analytic hierarchy process to construct the evaluation indices of the geological and engineering double sweet spots for the target beds corresponding to each well position. By drawing the evaluation index plans of geological sweet spots, engineering sweet spots and geological and engineering double sweet spots, the new recoverable areas for sweet spots are found. At the same time, this paper introduces how to construct and calculate the evaluation indices of the geological and engineering double sweet spots for the tight oil horizontal wells, and presents the prominent role of the evaluation indices of the geological and engineering double sweet spots on regulating the well track during drilling and effectively tracing the oil layer sweet spots with the example. The actual drilling application validations at the well site show that the evaluation indices of tight oil geological and engineering double sweet spots based on the analytic hierarchy process can provide comprehensive and accurate guidance for oil & gas exploration and development, proving their practicability and effectiveness in geological and engineering evaluation.

Key words

tight oil reservoir / sweet spot evaluation / analytic hierarchy process / geological sweet spot / engineering sweet spot

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LIU Huiming. Application of analytic hierarchy process in the construction of evaluation indicator system for tight oil geological and engineering double sweet spots and its validations through actual drilling[J]. Mud Logging Engineering, 2024, 35(4): 48-55 https://doi.org/10.3969/j.issn.1672-9803.2024.04.008

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