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首页> 外文期刊>Journal of African Earth Sciences >Distribution of pore pressure and fracture pressure gradients in the paleozoic sediments of Takouazet field, Illizi basin, Algeria
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Distribution of pore pressure and fracture pressure gradients in the paleozoic sediments of Takouazet field, Illizi basin, Algeria

机译：阿尔及利亚塔里阿齐特塔古阿泽特油田古生界沉积物中孔隙压力和裂缝压力梯度的分布

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摘要

A comprehensive pore pressure and fracture gradient (PPFG) characterization is a basic requirement for subsurface geomechanical modeling. This study deploys indirect approaches to estimate subsurface pressure profiles in the Mesozoic and Paleozoic successions of eastern Illizi basin, Algeria. Amoco exponent has been modeled for pseudo density generation and overburden gradient has been deciphered from a composite density profile. PP calculated from sonic and resistivity logs have been calibrated and validated with direct downhole measurements. Results indicate normal pore pressure regime in the Mesozoic and Devonian sediments. Disequilibrium compaction induced abnormal pore pressure in Silurian marine shales with a maximum gradient of 12.7 PPG. Top of geopressure has been marked at Silurian top (2050m). Pore pressure drops sharply from Silurian to Ordovician sediments, across the glacial unconformity (2332 m). Fracture gradients have been interpreted by Eaton's Poisson's ratio based model and Mathews & Kelly's effective stress ratio based approach. Based on the vertical distribution of subsurface pressure, effective vertical stress, a safe mud window has been recommended for optimum drilling fluid design.
机译：全面的孔隙压力和裂缝梯度（PPFG）表征是地下地质力学建模的基本要求。这项研究采用间接方法来估算阿尔及利亚东部伊利兹盆地中生代和古生代演替过程中的地下压力分布。已对Amoco指数进行了模拟以生成伪密度，并已从复合密度分布图中解释了覆盖梯度。由声波和电阻率测井得出的PP已通过直接井下测量进行了校准和验证。结果表明，中生代和泥盆纪沉积物中的孔隙压力正常。不平衡压实在志留纪海相页岩中引起异常孔隙压力，最大梯度为12.7 PPG。地压顶部已标记在志留纪顶部（2050m）。从志留纪至奥陶纪沉积物，整个冰川不整合面（2332 m）的孔隙压力急剧下降。断裂梯度已经通过伊顿基于泊松比的模型和马修斯和凯利基于有效应力比的方法进行了解释。根据地下压力的垂直分布，有效的垂直应力，建议使用安全的泥浆窗口来优化钻井液设计。

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  • 来源
    《Journal of African Earth Sciences》 |2020年第4期|103778.1-103778.10|共10页
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  • 作者单位

    Univ MHamed Bougara Boumerdes Fac Hydrocarbons & Chem FHC Dept Geophys Lab Resources Minerals Energet Boumerdes 35000 Algeria;

    Geologix Ltd Dynasty Bldg Wing A Andheri Kurla Rd Andheri E Mumbai 400059 Maharashtra India;

    MHamed Bougara Univ Boumerdes Fac Sci Dept Geol Lab Resources Minerals Energet Boumerdes 35000 Algeria;

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  • 正文语种 eng
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  • 关键词

    Pore pressure; Fracture pressure; Overburden; Abnormal pressure; Well log analysis; Takouazet field;

    机译：孔压断裂压力;过载压力异常;测井分析;Takouazet场;

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