10 84 1 31 1 10 16 Journal of the Japanese Association for Petroleum Technology Vol. 84, No. 1 Jan., 2019 pp. 10 16 Lecture CSEM Received September 6, 2018 accepted November 6, 2018 Effectiveness and limitations of CSEM survey for oil and gas exploration Yuji Takahashi Abstract Marine CSEM survey over 9 anticlinal structures was conducted in deep water exploration blocks in Malaysia. Later 4 of the 9 structures were drilled and found 3 true negative and 1 false negative in terms of CSEM results. In the false negative case, CSEM failed to predict the well result where a certain amount of oil and gas was discovered by a well despite lack of CSEM anomaly. Since the inverted resistivity profiles are coincide with well logging data at shallow part, validity of the CSEM theory and technique is undoubtable. Based on our experiences and case studies in literature, Marine CSEM survey is deemed to be effective and useful when applied to shallow target, thick net reservoir, wide hydrocarbon accumulation area, and deep-water environment. Keywords CSEM 1. CSEM Controlled Source Electromagnetics 1 2000 JX 2010 2 CSEM 9 CSEM 4 1 CSEM CSEM CSEM 30 6 13 30 This paper was presented at the 2018 JAPT Geology and Exploration Symposium entitled Impacts of Efficiency and Technology Development on Oil and Gas Exploration held in Niigata, Japan, June 13, 2018 JX JX Nippon Oil & Gas Exploration Corporation Corresponding author E-Mail takahashi.yuji.375@jxgr.com 2. CSEM CSEM CSEM 1 CSEM 2000 Statoil 2008 2002 CSEM EMGS 2004 CSEM CSEM 2010 1 2012 SEMC Seafloor Electromagnetic Methods Consortium 2015 CSEM CSEM 2 CSEM Copyright 2019 JAPT
11 1 CSEM CSEM CSEM JX 2000 CSEM 2002 EMGS 2004 CSEM 2009 2.5-D/3-D 2010 3-D CSEM 2011 EMGS OHM 2012 Schlumberger CSEM EMGS 2013 2 CSEM 2014 CSEM 2016 CSEM 2 Block-X Block-Y 700 km 2 5,500 km 2 400 1,100 m 100 1,200 m 4 4 3-D 700 km 2 3-D 2,300 km 2 3-D 700 km 2 CSEM 3-D CSEM 532 km 2 3-D CSEM 400 km 2 3 X1, X2, X3 1 Y1 2013 CSEM 2016 CSEM CSEM 3. CSEM 3.1 CSEM 2 2 Block-X Y 2013 3-D CSEM 2015 X 3 Y 1 3.2 CSEM EMGS EMGS CSEM 2 3 QC 1 CSEM 4 CSEM 1 X1 False Negative CSEM PGS Petromarker EMGS EMGS J. Japanese Assoc. Petrol. Technol. Vol. 84, No. 1 2019
12 CSEM MvO Magnitude versus Offset PvO Phase versus Offset CSEM CSEM CSEM CSEM CSEM CSEM Schlumberger 3-D 3.3 CSEM CSEM 4 CSEM 2 CSEM 4 CSEM 4 3 True Negative 1 False Negative 1 4 X1 Y1 3.4 Block-X CSEM Block-X AVO CSEM 3-D CSEM 2011 X1 X2 X3 3 2 km 132 11 2 CSEM 3-D VTI Vertically 2 Block-X CSEM CSEM 3 X1 X2 X3 3-D CSEM X1 X2 X3 3 Block-X CSEM Rv 84 1 2019
13 5 Block-X CSEM 3-D F1 F3 F4 4 X1 CSEM Rv Rh 2,000 mtvdss CSEM 1,250 m Transverse Isotropic 2 3 X1 CSEM CSEM X1 2,000 m TVDSS CSEM 4 Schlumberger Rt Scanner RvRh CSEM 3-D CSEM CSEM 90m 20 ohmm CSEM 3 1 CSEM 2,400 m TVDSS 1,250 m Rv CSEM 3.5 Block-X CSEM 3-D 5 X1 X2 F1 F3 F4 VTI Hansen et al., 2016 CSEM 3.6 Block-Y CSEM Block-Y 5 6 1.5 2 km 173 11 6 J. Japanese Assoc. Petrol. Technol. Vol. 84, No. 1 2019
14 CSEM 6 Block-Y CSEM CSEM Block-X VTI 3-D 7 Y1 Rv Rh Y1 CSEM Y1 CSEM 8 8 Y1 CSEM Rt Scanner LWD Rh Rt Scanner Rh 2,300 m 500 m 1,800 m CSEM Rh 7 Y1 CSEM Y1 84 1 2019
15 Rv CSEM 1,800 m CSEM CSEM 4. CSEM 2015 2016 CSEM CSEM CSEM CSEM 4.1 Hesthammer et al. 20122011 12 12 CSEM 4 Skrugard Norvarg Havis Heilo 1 Breiflabb Phoenix 1 Kora 7 NOC 7 3 True Positive 3 True Negative 1 False Positive 9 False Positive Kora CSEM Kora True Positive 7 True True Positive 3 400 m 800 1,400 m 80m True Positive CSEM True Positive 4 300 m 2,000 m True Negative Breiflabb Phoenix Heilo CSEM False Positive True Negative CSEM 4.2 CSEM 7 CSEM False 1 False 20 CSEM CSEM 300 m 2,000 m CSEM 3,000 m CSEM 2,000 m True Positive 100 1,500 m 80m CSEM CSEM 5. 9 Hesthammer et al. 2012 CSEM CSEM CSEM CSEM CSEM J. Japanese Assoc. Petrol. Technol. Vol. 84, No. 1 2019
16 CSEM CSEM CSEM Air Wave CSEM VTI TTI Tilted Transverse Isotropy CSEM CSEM CSEM CSEM CSEM 300 m 2,000 m 50 m 4 km 30 JX 2008 JOGMEC 42 2 55-73 Hesthammer, J., Stefatos, A., and Sperrevik, S., 2012 : CSEM efficiency evaluation of recent drilling results. First Break, 30, 47 55. Hansen, K.R., Panzer, M., Shantsev, D. and Mittet, R., 2016 : EMGS, http://www.emgs.com/content.ap?contentid=1259 accessed 2018/8/1. 84 1 2019