Petrophysical Analysis Based on Well Logging Data for Tight Carbonate Reservoir: The SADI Formation Case in Halfaya Oil Field

Abstract

Carbonate reservoirs are an essential source of hydrocarbons worldwide, and their petrophysical properties play a crucial role in hydrocarbon production. Carbonate reservoirs' most critical petrophysical properties are porosity, permeability, and water saturation. A tight reservoir refers to a reservoir with low porosity and permeability, which means it is difficult for fluids to move from one side to another. This study's primary goal is to evaluate reservoir properties and lithological identification of the SADI Formation in the Halfaya oil field. It is considered one of Iraq's most significant oilfields, 35 km south of Amarah. The Sadi formation consists of four units: A, B1, B2, and B3. Sadi A was excluded as it was not filled with hydrocarbons. The structural and petrophysical models were built based on data gathered from five oil wells. The data from the available well logs, including RHOB, NPHI, SONIC, Gamma-ray, Caliper, and resistivity logs, was used to calculate the petrophysical properties. These logs were analyzed and corrected for environmental factors using IP V3.5 software. where the average formation water resistivity (Rw = 0.04), average mud filtrate resistivity (Rmf = 0.06), and Archie's parameters (m = 2, n = 1.9, and a = 1) were determined. The well-log data values calculated the porosity, permeability, water saturation, and net-to-gross thickness ratio (N/G).

Enhance Tight Oil Reservoir Recovery Based on Co2-Water Flooding as Environmentally Friendly Method: Case Study

“…Sa'di-B1, Sa'di-B2, and Sa'di-B3 are all filled with oil, nevertheless Sa'di-A does not contain any oil. On the other hand, the Sa'di reservoir is considered to be a tight reservoir due to its low porosity and permeability [13] [14].…”

Estimation of the Petrophysical Properties of the Lower Cretaceous Yamama (YC) Formation in Siba Field

“…In particular, identifying the hydrocarbon-and nonhydrocarbon-bearing zones requires petrophysical analysis, which is crucial for reservoir characterization [1][2][3][4][5][6]. The petrophysics of any field encompasses the reservoir fluid parameters and reservoir rock qualities that can influence recovery and production levels [7][8][9].…”

Comparative Study between Different Oil Production Enhancement Scenarios in an Iraqi Tight Oil Reservoir

“…During this time, there was intermittent oil production and some of the wells were shut-in. As a result, and because of the poor petrophysical characteristics of Saadi reservoir, matrix acidizing failed in enhancing production from such tight oil reservoirs [7]. Therefore, to bypass the complexity of fishbone and deviated wells and the underwhelmed production of acid fracturing and matrix acidizing treatments, hydraulic fracturing of vertical wells and drilling horizontal wells scenarios are proposed for developing Saadi reservoir.…”