Integration of old and new measurements to optimize redevelopment of the Lower Lagunillas reservoir of Bloque IV, Lake Maracaibo, Venezuela

作     者：Bryant, ID Baygun, B Herron, MM Matteson, A Ramamoorthy, R Stewart, L Tariq, SM Coll, C Cordova, P de Villarroel, HG Hernandez, L Jimenez, Z Leon, K Rondon, L 

作者机构：Schlumberger Doll Res Reservoir Monitoring & Modeling Program Ridgefield CT 06877 USA Maravan SA Caracas Venezuela 

出 版 物：《SPE RESERVOIR EVALUATION & ENGINEERING》 (石油工程师协会油藏评估与工程)

年 卷 期：1998年第1卷第3期

页      面：180-191页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0708[理学-地球物理学] 

主　　题：data quality Engineering recovery saturation reservoir well logging study area pilot study area interpretation Venezuela Core analysis Directional drilling Drilling Operations Drillstem/well testing Estimates of resource in place Exploration development structural geology Flow in porous media Fluid Characterization Formation Evaluation & Management Improved and Enhanced Recovery 

摘      要：The Lower Lagunillas of Bloque IV of the Bachaquero field is a supergiant reservoir that has been in production since 1956. We have carried out a pilot reservoir characterization study in the central part of the field, in which we have integrated all the available data into three-dimensional (3D) reservoir simulation models whose purpose is to optimize redevelopment of the area with horizontal wells. An analysis of the history of production was undertaken to gain an insight into the reservoir dynamics. This analysis indicated the inefficiency of gas injection in providing pressure support to the pilot study area and demonstrated the presence of active aquifer encroachment from the south. Anomalies in production behavior and fluid characteristics indicate both lateral and vertical compartmentalization of the reservoir. We have integrated Fourier transform infrared (FTIR) measurements of mineralogy from old cores with a comprehensive logging suite in a new well to re-evaluate older, sparse logging suites. The application of a mineral-based log evaluation and high-resolution processing of the new logs has led to a significant increase in estimates of oil initially in place in the study area. We have used a novel approach to estimate permeability in all wells in the study area. Combining these new evaluations with a revised geological model enabled us to recognize 11 geological layers throughout the area. Formation pressure measurements confirm that partial barriers to vertical communication exist between most of these layers. Cased hole saturation measurements and historical production data indicate an uneven sweep of these layers, such that five layers contain bypassed oil that could be recovered by horizontal wells. We have constructed very detailed simulation models that describe the lateral and vertical variation in petrophysical properties of each of these layers. These models have been used to select the optimum locations for horizontal wells and to optimize thei