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A. Adekanle - One of the best experts on this subject based on the ideXlab platform.

  • A Fortran Programme for Computing Formation (Connate) Water Resistivity from Spontaneous Potential Logs
    2015
    Co-Authors: P. A. Enikanselu, A. Adekanle
    Abstract:

    Abstract: A computer programme in Fortran language for computing formation water resistivity, R, fromw Spontaneous Potential (SP) log has been designed, coded and tested. The aim was to develop a fast alternative approach of measuring R devoid of the use charts. The input data- bed thickness, Flushed Zone and mudw resistivities, mud-filtrate resistivity, surface and formation temperatures and the static self potential (SSP)- were derived from digitized wireline logs from widely located sedimentary basins. The output was tested using borehole and laboratory data from pre-existing wells and the results were compared. The maximum percentage deviation was less than 5%. The programme has therefore provided a fast technique of estimating R, correctingw for formation (bed) thickness/cleanliness and thus reducing the subjectivity inherent in the use of charts. Key words: Fortran Formation-Water-Resistivity Spontaneous Potential Log Mud Filtrate INTRODUCTION techniques of determining R. The Spontaneous or Self The earth, especially in sedimentary areas, is highly occurs spontaneously between reservoir rocks and a stratified. The constituents of the various strata fluid-filled borehole. This natural voltage originates from (rock and fluid contents) often have diverse physical and electrochemical and electrokinetic actions, Tenchov [2] geologic properties. These properties include porosity, and causes an electrical current to flow in conductiv

  • a fortran programme for computing formation connate water resistivity from spontaneous potential logs
    2008
    Co-Authors: A. Adekanle
    Abstract:

    A computer programme in Fortran language for computing formation water resistivity, R , from w Spontaneous Potential (SP) log has been designed, coded and tested. The aim was to develop a fast alternative approach of measuring R devoid of the use charts. The input data - bed thickness, Flushed Zone and mud w resistivities, mud-filtrate resistivity, surface and formation temperatures and the static self potential (SSP) - were derived from digitized wireline logs from widely located sedimentary basins. The output was tested using borehole and laboratory data from pre-existing wells and the results were compared. The maximum percentage deviation was less than 5%. The programme has therefore provided a fast technique of estimating R , correcting w for formation (bed) thickness/cleanliness and thus reducing the subjectivity inherent in the use of charts.

Falah Khalaf Al-juboury - One of the best experts on this subject based on the ideXlab platform.

  • Petrophysical properties of the Lower Cretaceous formations in the Shaikhan oilfield, northern Iraq
    Universidad Nacional de Colombia, 2018
    Co-Authors: Wria Jihad Jabbar, Srood Farooq Naqshabandi, Falah Khalaf Al-juboury
    Abstract:

    The current study represents an evaluation of the petrophysical properties in the well Shaikhan-8 for the Garagu, Sarmord and Qamchuqa formations in Shaikhan oilfield, Duhok basin, northern Iraq. The petrophysical evaluation is based on well logs data to delineate the reservoir characteristics. The environmental corrections and petrophysical parameters such as porosity, water saturation, and hydrocarbon saturation are computed and interpreted using Interactive Petrophysics (IP) program. Neutron-density crossplot is used to identify lithological properties. The Qamchuqa Formation in the Shaikhan oilfield consists mainly of dolomite with dolomitic limestone, and the average clay volume is about 13%; while Sarmord Formation composed of limestone and dolomitic limestone, the average clay volume in this formation is about 19%; also the Garagu Formation consists mainly of limestone and dolomitic limestone in addition to sandstone and claystone, the volume of clay in the Garagu Formation is about 20%. Pickett plot method is used to calculate formation water resistivity (Rw), saturation exponent (n) and cementation exponent (m) the values are 0.065ohm, 2, and 2.06 respectively. The porosity ratio (Ø) of the Qamchuqa Formation ranges between 7-15%; this indicates that the lower part of the formation has a poor-fair porosity (7%), while the upper part of the formation has a good porosity (15%). The porosity value decrease toward Sarmord Formation especially in the lower part of the formation, it has a poor porosity (5%), whereas this value reaches to 13% in the upper part of the formation, indicates for fair porosity. Garagu Formation has good porosity, reaches 20% in the lower part, but in the upper part of the formation, this value decreases to 3%. Water saturation (Sw) value which is calculated by Archie equation ranges between 14-33%, while saturation in the Flushed Zone (Sxo) ranges between 52-73%, these indicate for good movable hydrocarbons are present in the studied interval (840-1320m), and from the total 480m the Early Cretaceous formations in well Shaikhan-8 have 178m pay

Qiuyuan Hou - One of the best experts on this subject based on the ideXlab platform.

  • logging response characteristics and formation process of Flushed Zone in the orinoco heavy oil belt venezuela
    Petroleum Exploration and Development, 2020
    Co-Authors: Heping Chen, Hao Chen, L I Changwen, Yusheng Wang, L I Jianping, Rui Huang, Congcong Tian, Qiuyuan Hou
    Abstract:

    Abstract The origins and logging responses of Flushed Zones in some blocks of Orinoco heavy oil belt, Venezuela are still unclear. To solve this issue, we examined the conventional logging, nuclear magnetic resonance logging, fluid viscosity, core analysis and oil field production data comprehensively to find out the logging responses and origins of the Flushed Zones. The results show that the main reason for the formation of Flushed Zone is surface water invasion, which leads to crude oil densification. The crude oil densification produces asphalt membrane (asphalt crust) which wraps up free water, causing special logging responses of the Flushed Zones. According to the different logging responses, we classified the Flushed Zones into two types and analyzed the formation processes of the two types of Flushed Zones. According to the characteristics of logging curves after water flush, we confirmed that the water flush began earlier than the reservoir accumulation.

Songwei Guo - One of the best experts on this subject based on the ideXlab platform.

  • the orinoco heavy oil belt meteoritic water Flushed Zone logging identification and influence on reservoir development strategy case study of p oilfield
    2019
    Co-Authors: Songwei Guo
    Abstract:

    The water cut of some oilfield increased rapidly in Orinoco heavy oil belt in Venezuela; the most important key is that the parts of reservoir invaded by low-salinity meteoritic water are called meteoritic Flushed Zone. The paper investigated the possible causes of the Flushed Zone, based on the identified Flushed Zone in P oilfield, and three methods used to identify Flushed Zone were summarized (conventional logging, NMR, and other test data). Different development strategies were made according to different contact relationship between the Flushed Zone and reservoir. Based on the well logging identify methods for the meteoritic Flushed Zone, all the wells in the P oilfield were reprocessed, the development strategies also was adjusted, and the comprehensive water production rate of oilfield was decreased. Proved that the meteoritic Flushed Zone identify methods and oilfield development strategies adjusted methods are possible. The well logging identify methods for the meteoritic Flushed Zone provide important technical support for Orinoco heavy belt; also the oilfield development strategies adjusted methods provide a significant reference for the other assets on the Orinoco heavy oil belt.

Al-juboury, Falah Khalaf - One of the best experts on this subject based on the ideXlab platform.

  • Petrophysical properties of the Lower Cretaceous formations in the Shaikhan oilfield, northern Iraq
    Universidad Nacional de Colombia - Sede Bogotá - Facultad de Ciencias - Departamento de Geociencia, 2018
    Co-Authors: Jabbar, Wria Jihad, Naqshabandi, Srood Farooq, Al-juboury, Falah Khalaf
    Abstract:

    The current study represents an evaluation of the petrophysical properties in the well Shaikhan-8 for the Garagu, Sarmord and Qamchuqa formations in Shaikhan oilfield, Duhok basin, northern Iraq. The petrophysical evaluation is based on well logs data to delineate the reservoir characteristics. The environmental corrections and petrophysical parameters such as porosity, water saturation, and hydrocarbon saturation are computed and interpreted using Interactive Petrophysics (IP) program. Neutron-density crossplot is used to identify lithological properties. The Qamchuqa Formation in the Shaikhan oilfield consists mainly of dolomite with dolomitic limestone, and the average clay volume is about 13%; while Sarmord Formation composed of limestone and dolomitic limestone, the average clay volume in this formation is about 19%; also the Garagu Formation consists mainly of limestone and dolomitic limestone in addition to sandstone and claystone, the volume of clay in the Garagu Formation is about 20%. Pickett plot method is used to calculate formation water resistivity (Rw), saturation exponent (n) and cementation exponent (m) the values are 0.065ohm, 2, and 2.06 respectively. The porosity ratio (Ø) of the Qamchuqa Formation ranges between 7-15%; this indicates that the lower part of the formation has a poor-fair porosity (7%), while the upper part of the formation has a good porosity (15%). The porosity value decrease toward Sarmord Formation especially in the lower part of the formation, it has a poor porosity (5%), whereas this value reaches to 13% in the upper part of the formation, indicates for fair porosity. Garagu Formation has good porosity, reaches 20% in the lower part, but in the upper part of the formation, this value decreases to 3%. Water saturation (Sw) value which is calculated by Archie equation ranges between 14-33%, while saturation in the Flushed Zone (Sxo) ranges between 52-73%, these indicate for good movable hydrocarbons are present in the studied interval (840-1320m), and from the total 480m the Early Cretaceous formations in well Shaikhan-8 have 178m pay.Este estudio presenta una evaluación de las propiedades petrofísicas en el pozo Shaikhan-8 para las formaciones Garagu, Sarmord y Qamchuga, en el campo petrolero de Shikhan, cuenca Duhok, al norte de Irak. La evaluación petrofísica se basó en la información de registro de pozos, lo que permitió delinear las características del depósito. Las correcciones ambientales y los parámetros petrofísicos como porosidad, saturación del agua, y saturación de hidrocarburo se calcularon e interpretaron a través del programa Interactive Petrophysics (IP). La gráfica de interrelación de densidad de neutrones se utilizó para identificar propiedades litológicas. La Formación Qamchuqa consiste principalmente de dolomita y caliza dolomítica, y el promedio de volumen arcilloso es cercano al 13 %; mientras que la Formación Sarmord se compone de caliza y caliza dolomítica, con un promedio de volumen arcilloso de 19 %; la Formación Garagu está formada por caliza y caliza dolomítica con adición de arenisca y arcillolitas, y su volumen arcilloso es de 20 %. La gráfica de Pickett se utilizó para calcular en las formaciones la resistividad del agua (Rw), el exponente de saturación (n) y el exponente de cementación (m); los resultados en las tres formaciones de estudio fueron de 0.065ohm, 2, y 2.06. La proporción de porosidad (Ø) de la Formación Qamchuqa oscila entre 7 y 15 %; esto indica que la parte más baja de la formación tiene una porosidad entre regular y baja (7 %), mientras que la parte más alta tiene un alto índice de porosidad (15 %). El valor de porosidad cae hace la Formación Sarmord, especialmente en su parte más baja donde tiene un índice bajo (5 %), mientras que en la parte alta alcanza el 13 %, lo que indica un nivel regular. La Formación Garagu tiene un buen índice de porosidad que alcanza el 20 % en la parte más baja, pero que en la parte alta cae al 3 %. El valor de saturación de agua (Sw), que se calcula por la ecuación de Archie, oscila entre el 14 y el 33 %, mientras que la saturación en la zona lavada (Sxo) oscila entre el 52 y el 73 %; esto demuestra que los hidrocarburos móviles están presentes en el intervalo de estudio (840-1320m), y que del total de 480 metros de las formaciones del Cretácico Temprano en el pozo Shaikhan-8, aproximadamente 178 metros de zona productora