融合地震属性和成像测井信息优化的储层缝洞带评价与钻井轨迹

针对新疆某工区强非均质性岩溶缝洞型碳酸盐岩储层，提出了一种基于地震多属性优化与电成像测井信息融合的碳酸盐岩储层缝洞带识别评价与钻井轨迹优化设计方法。首先，利用相干体、蚂蚁体等多种地震属性与张量约束的稀疏脉冲反演结果综合实现缝洞发育带空间分布预测与雕刻，确定可能油气圈闭的分布范围；然后，基于数学形态学滤波方法，由电成像测井资料自动拾取井壁的裂缝和溶蚀孔洞分布，统计井壁裂缝倾向和倾角；再次，用工区内钻孔多臂井径资料计算的井筒崩落信息与电成像资料拾取的诱导缝信息预测工区的最大和最小主应力方向；最后，融合地震属性与电成像测井信息评价的缝洞分布结果，预测工区内走滑断裂带的最大主应力方向以NE—SW为主，局部为NW—SE，且以中高角度为主的裂缝走向与主应力近乎平行。采用预测主应力分布方法实现了沿NW—SE方向的大斜度井与水平井优化设计，钻遇了大规模优质储集体，获得了稳定油流，并以此为基础在周围打井若干口，极大地降低了深层勘探的钻井风险。

Evaluation of Fracture Zones and Optimazation of Borehole Tracks in Carbonate Formations Through Information Fusion of Seismic Attributes and Electric Image Well Logging

Strong heterogeneity is a problem in the exploration in fracture and vug zones of carbonate formations in the Xinjiang oil work region. In this study, we developed a method based on information fusion of seismic multi-attributes optimized and electric image well logging, then applied it to identify and evaluate the fracture and vug zones existed in carbonate formations, and further to optimize the borehole tracks in carbonate reservoirs. First, we predicted and sculptured the spatial distribution of fractures and vugs by using the information derived from the multiple seismic attributes of coherence, ant tracking, and others in combination with the result of pulse inversion constrained by dip vectors to determine the scope of the potential hydrocarbon trap;Second, the orientation and dip of the fractures and the scattering of the vugs were statistically estimated through the information automatically picked up from the borehole electric images by means of mathematical morphology filtering;Third, the orientations of maximum and minimum stresses in the formations were estimated through the information of borehole collapse deduced from the multi-arm dipmeter logs and the drill bit induced fractures extracted from the electric image well logs;Furthermore, the results of fracture distribution and vug scattering were obtained through information fusion of multiple seismic attributes and electric images, which can be used as an indicator of the orientation of the maximum stress in regional slipping faults. The orientation of the maximum stress in this region is directed to NE-SW, locally directed to NW-SE, and the fractures with medium-high dip are along the maximum stress direction. Based on the predicted maximum stress, the optimization borehole track of deviated borehole and horizontal well was designed along the direction of NW-SE. In application, the drilled boreholes penetrated large scale high quality reservoirs, and obtained stable amount of oil production. Also, by using this method, the risk of deep formation exploration can be significantly decreased.