Abstract:In view of the problems of rapid lateral change of sedimentation, small sand-body scale, and scattered distribution of remaining oil in continental oil fields, the multi-point geostatistical modeling method constrained by seismic inversion is adopted to realize the three-dimensional accurate representation of sand-body space and guide the remaining-oil potential tapping of old oil fields. Specific steps are as follows: Firstly, the “training images” are constructed for plane combination modes of three distributary channel sand bodies and two non-channel sand bodies of the river-delta facies. Secondly, the P-wave impedance characteristics of different sedimentary microfacies are defined. In other words, the channel sand body features low P-wave impedance, and the inter-river mud features high P-wave impedance, while that of inter-river sand is between the two. The P-wave impedance data volume is obtained by the waveform-indication inversion method. Finally, the training images are used to replace the variation function for mode guidance, and the inversion data volume of P-wave impedance is used as the inter-well trend control to achieve the fine modeling of multi-point geostatistical sedimentary microfacies. The results show that the multi-point geostatistics method (compared with the conventional modeling method) can clearly describe the geometric shape, width, and sand-body contact relationships of channels, and the connection relationship between sand bodies is more clear, with fewer invalid grids. The average prediction accuracy of channel sand bodies is improved from 79.6% to 86.1%. Given the modeling results, the potential positions of remaining oil in the study area are identified, and the measures to guide potential tapping have achieved good results. This indicates that the method in this paper can meet the needs of fine reservoir description and accurate potential tapping of remaining oil in continental oil fields.
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