tailieunhanh - Correction and Supplementingation of the well log curves for Cuu Long oil basin by using the artificial neural networks
This study corrected and supplemented the broken segments, then use the corrected and supplemented curves to calculate porosity. The porosity calculated in this study for 9 wells has been used by JVPC to build the mining production technology diagrams, whle the existing softwares can not calculate this parameter. The testing result proves that the Artificial Neural Network model (ANN) of this study is great tool for correction and supplementing of the well log curves. | VNU Journal of Science: Earth and Environmental Sciences, Vol. 33, No. 1 (2017) 16-25 Correction and Supplementingation of the Well Log Curves for Cuu Long Oil Basin by Using the Artificial Neural Networks Dang Song Ha1,*, Le Hai An2, Do Minh Duc1 1 Faculty of Geology, VNU University of Science, 334 Nguyen Trai, Hanoi, Vietnam 2 Hanoi Mining and Geology University, 18 Vien, Duc Thang, Hanoi, Vietnam Received 06 February 2016 Revised 24 February 2016; Accepted 15 March 2017 Abstract: When drill well for the oil and gas exploration in Cuu Long basin usually measure and record seven curves (GR, DT, NPHI, RHOB, LLS, LLD, MSFL). To calculate the lithology physical parameters and evaluate the oil and gas reserves, the softwares (IP, BASROC.) require that all the seven curves must be recorded completely and accurately from the roof to the bottom of the wells. But many segments of the curves have been broken, and mostly only 4, 5 or 6 curves have could recorded. The cause of the curves being broken or not recorded is due to the heterogeneity of the environment and the lithological characteristics of the region. Until now the improvements of the measuring recording equipments (hardware) can not completely overcome this difficulty. This study presents a method for correction and supplementing of the well log curves by using the Artificial Neural Networks. Check by 2 ways: 1). Using the good recorded curves, we assume some segments are broken, then we corrected and supplemented these segments. Comparing the corrected and supplemented value with the good recorded value. These values coincide. 2). Japan Vietnam Petroleum Exploration Group company LTD (JVPC) measured and recorded nine driling wells. Data of these nine wells broken. This study corrected and supplemented the broken segments, then use the corrected and supplemented curves to calculate porosity. The porosity calculated in this study for 9 wells has been used by JVPC to build the mining production technology .
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