Identification of gas in carbonate rock using wavelet transform
Subject Areas : PetrophysicsHassan Omrani 1 * , Hashem omrani 2
1 - دانشگاه صنعت نفت دانشکده نفت اهواز
2 - islamic azad university
Keywords: Wavelet transform, petrophysical log, porosity, water saturation, gas identification in carbonate rock,
Abstract :
Gas can be diagnosed in clean sand rock by petrophysical log. It is not easy to determine the gas in carbonate rock by petrophysical log. The R.F.T. tool is used to determine the gas in carbonate rock. The fluid density in the rock is determined by calculating the pressure difference related to depth. The R.F.T. tool has some disadvantages, such as being expensive, taking much time to run, and rock having a neutron porosity of about 15%, and sometimes the R.F.T. tool is stuck in well. This study applies the wavelet transformation, a recent advance in signal analysis technique, to detect reservoir rock fluid. The porosity and water saturation are denoised using the "demy" mother wavelet. At last, the pore hydrocarbon saturation, porosity denoise by the "demy" wavelet, pore volume plot and R.F.T. tool are plotted together in one figure to identify the kind of fluid in sand and carbonate rocks.
[1] صادق نژاد،س.رضا پيشوايي،م.بزرگمهري،ر.تئوري موجك در مهندسي نفت- مجله ي اكتشاف و توليد
[ 2] Schlumberger Log Interpretation Principles/Applications. 1998. Seven Printing. March Sugar Land, Texas 77478.
[ 3]Geng X, Young, Y, Lu, P, and Zhao S.(1983), Delectric log – a logging method for determining oil saturation. SPE: Vol.35
[4] Dahlberg KE and Ference MV. (1984), a quantitative test of electromagnetic propagation (EPT) log for residual oil Determination. New Orlean; Pager DDD presented at 25th soc. of professional well log analyst annual logging symposium
[5]عزيزي، ه.، تخم چي، ب.، احمدي نوبري، ح.، 1390 ، "اهميت گزينش موجك مادر بهينه در تحليل داده ها در حوزه علوم زمين"، فصل نامه زمين شناسي ايران، شماره هجدهم،
[6] Wen – zheng yue Gau tau, (2006), liu. Identifying reservoir fluids by wavelet transform of well logs.SPE
[7] ملاجان ، م.معماریان ،ح.تخم چی ،ب. بكارگيري روش هاي تشخيص الگو جهت شناسايي سيا لات مخزني با استفاده از داده هاي پتروفيزيكي
[8] ملاجان ،ا.جاوید، م.معماریان ،ح.تخم چی ،ب.شرکتی ،ش.تشخيص سطوح تماس سيالات مخزني و نقش آن در تعيين سطوح سيالات پس از ذخيره سازي با استفاده از تكنيك موجك
[9]طاهردنگ کو، رضا و آبدیده، محمد،1393،آشکار سازی شکاف با استفاده از نمودار اشباع آب و آنالیز تبدیل موجک،دومین همایش ملی نفت و گاز ایران،کرمان،https://civilica.com/doc/309455.
[10] Mallat, S., 1999, “A wavelet tour of signal processing”, Academic Press, p. 66.
[11] Burrus, C.S., Burrus, C.Sidney, Guo, H. and Gopinath, R.A., 1997, Introduction to Wavelet and Wavelet Transforms: A Primer, Prentice Hall, 268.
[12] ابرتو سرا، چاه نگاري ، ترجمه ي دكتر غلام حسين نورزي
[13] عادل زاده ،م. اصول مهندسي بهره‌برداري و توليد - جلد سوم، انتشارات ستايش، 1388