02509nmc a2200253 4500 20260520005611.0 260224s2001 xxu ing Inglés Stochastic Modeling of Rock Heterogeneities Applying New Autocorrelation Estimators and Simulated Annealing SPE 69654 Dallas, Texas Society of Petroleum Engineers 2001 12/09/06 ; 17/07/01 Two new integral estimators of spatial autocorrelation are put forward and studied. The first is LV (Local Variance), based on the variance of the distribution. It is also an estimator of the average value of the semivariogram within a region. The second, SLV (Semivariogram from the Local Variance), is related to the derivatives of the former. It is an estimator of the semivariogram itself. The behavior of these two estimators is compared to that of the classical semivariogram estimator (CSV) using different data sets. SLV behavior is similar to that of CSV. Both are noisy and present fluctuations that increase with lag distance. Instead, LV is smoother and more resistant to outliers, making it easier to be represented by a theoretical model. Also, LV is less affected by individual values of samples, honoring the general statistics of data. Afterwards, the ability of the three estimators to model actual spatial variability is tested using the Simulated Annealing optimization technique. This technique has a good performance when any of the three estimators is included in the objective function. It is able to reproduce actual porosity or permeability fields, even when there is a specific spatial structure (such as cyclic, staircase-like, etc). However, LV has a main advantage: it still preserves the main features of the spatial structure even though it is very smooth. CONGTP Saccomano, A.F. 6632 Savioli, G.B. 6633 Bidner, M.S. 6634 Latin American and Caribbean Petroleum Engineering Conference (7th : 2001 mar. 25-28 : Buenos Aires, Argentina) 5738 Savioli, G.B. 6633 Bidner, M.S. 6634 Latin American and Caribbean Petroleum Engineering Conference (7th : 2001 mar. 25-28 : Buenos Aires, Argentina) 5738 Saccomano, A.F. 6632 131222 131222 https://biblioteca.iapg.org.ar/ArchivosAdjuntos/Bibliotecas/https://biblioteca.iapg.org.ar/ArchivosAdjuntos/LACPEC2001/Spe69654.pdf 0 0 0 0 202144 BVIAPG BVIAPG 2026-03-03 200003306 0 200003306 2026-03-03 01:41:20 2026-03-03 ARCHIVO