Organization
BGP Inc., CNPC, Zhuozhou 072050, China
摘要
四川盆地龙女寺地区龙王庙组储层以缝洞型白云岩储层为主，内部沟通气源的缝洞尺度较小且各向异性较强，因此，寻找缝洞发育区是油田增储上产的重要方向。针对在碳酸盐岩波阻抗直方图上岩性复杂重叠、无法区分，常规波阻抗反演技术无法有效预测研究区储层发育区的分布问题，文中综合地质、测井、录井、地震等资料，利用阵列声波测井资料，得到斯通利波声波能量衰减曲线（该曲线受缝洞发育程度影响较大，且不受流体影响，纵向分辨率高）；然后利用声波能量衰减曲线获取储层岩石物理特征及测井响应特征，建立储层发育区识别图版；利用声波能量衰减曲线刻画单井缝洞发育区纵向分布位置，以此为约束，结合地震资料开展地质统计学反演，将单井连通性特征曲线用于高精度储层反演预测工作中，得到了储层分布特征。研究得到的储层分布特征与单井解释结论较为吻合，表明本次研究有较好的经济效益与应用前景。
Abstract
The Longwangmiao Formation in the Longnyusi area of Sichuan Basin is dominated by fracture-cave dolomite reservoir, and the fracture-cavity scales for internal gas communication are small and highly anisotropic. Therefore, the search for fracture-cavity development area is an important factor to increase the reservoir production. In the histogram of carbonate wave impedance, the lithology is complex, overlapping and unable to be distinguished, and the conventional wave impedance inversion technology cannot effectively predict the distribution of reservoir development zone in the study area. Aiming at these problems, in this paper, based on geological, logging, mud logging and seismic data, the acoustic energy attenuation curve of Stoneley wave is obtained by using array acoustic logging data (this curve is greatly affected by the development degree of fracture and cave, not affected by fluid, and has high longitudinal resolution). Then, the petrophysical characteristics and logging response characteristics of the reservoir are obtained by using the energy attenuation curve, and the identification chart of the reservoir development area is established. The acoustic wave energy attenuation curve is used to depict the vertical distribution of fracture-cavity development zone for single well. Based on this constraint, the geostatistical inversion is carried out with seismic data. The single well connectivity characteristic curve is used in the high-precision reservoir inversion and prediction, and the reservoir distribution characteristics is obtained. This reservoir distribution characteristics are in good agreement with the known interpretation results of a single well, which achieves good economic benefits and application prospects.
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