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• W2124389478 abstract "In January 2004, the Mangala Field discovery well was drilled in the Barmer Basin of Rajasthan, in northwestern India. The petrophysical data acquired in this and subsequent wells allow a very precise estimation of field stock tank oil initially in place (STOIIP). This paper documents the techniques that allowed the estimate of STOIIP to be more precisely defined and to be revised upward by 12%, a substantial increase when dealing with a billion barrel field. Conventional log evaluation of the initial data indicated a sequence of clean, quartzose sandstones with porosity greater than 25%. This, with resistivity in the oil column over 2,000ohm-m, suggested that water saturations (S w ) were ∼15% or even less. Based on initial data and conventional techniques, the initial STOIIP estimate was made and an extensive core analysis program was begun in six appraisal wells. The objective was to better define the actual reservoir STOIIP. An appraisal well was cored with synthetic oil based mud containing a tracer, and Dean-Stark S w analyses were done. In addition to routine core analyses and the Dean-Stark S w data, a sizeable set of other special core analyses is also now available. This includes extensive capillary pressure data, laboratory NMR, and core electrical properties measurements. The current petrophysical dataset verifies the existence of S w values that are typically less than 5%PV, and as low as 1%PV, in a very high-permeability and high-porosity reservoir containing little clay. The reservoir contains a medium gravity, highly paraffinic oil, and is moderately oil-wet. The various laboratory datasets challenged some of the standard assumptions concerning the use of Archie constants in such reservoirs for S w calculations. The upward revision of STOIIP is significant, and can be principally attributed to the more accurate estimation of reservoir fluid saturations. As this work demonstrates that very low S w values exist in the Barmer Basin, the Mangala field can provide a model for the proper economic evaluation of similar reservoirs. The laboratory results question some of the traditional thinking about the petrophysical properties of reservoirs such as this one. One should not be surprised that high quality reservoirs can have initial water saturations lower than 5% of pore volume on average, and with some zones at less than 1%. Present electric log tools and analysis methods will not establish these low levels without integration with core data and appropriately designed core analysis programs. Also, and perhaps more importantly, this work clearly demonstrates the economic worth of extensive laboratory measurements and analyses on a high-volume, high-value reservoir such as Mangala." @default.
• W2124389478 created "2016-06-24" @default.
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• W2124389478 date "2009-06-01" @default.
• W2124389478 modified "2023-09-26" @default.
• W2124389478 title "Evidence And Verification of Very Low Water Saturations Within the Fatehgarh Sandstone, Barmer Basin, India" @default.
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