Research On Fine Prediction Of High-Shale-Content Laminated Sand Reservoir

The strategy, technology and process of high resolution reservoir prediction is studied, on base of analysis on problem in nomarine reservoir prediction. The scheme of"Five Stages-Nine Steps"is put forward according to the characteristic, which includes process of log and seismic data, the well-seismic relation, multi-parameter iterative invertion, 3D integrated reservoir modeling in depth-domain. Another important factor is the consistency and conjunction existing in all stages of fine reservoir prediction. And that, searching for an effective prospect method and technology that adapt to the high-shale-content laminated sand reservoir, so that the risk of oil and gas prospect reduces.The case from DaQing oilfield is researched, reservoir prediction is carried out in PuTaoHua reservoir. The related content is below:The respond in log and reflection in seismic of high-shale-content laminated sand reservoir is analysised according to statistics in log data and Seismic simulation. The log respond of high-shale-content laminated sand reservoir is more weak than that of normal sand reservoir, and the seismic reflection is related to the mud content, properties of reservoir and faces.The SNWave method is adopted to enhance seismic reflection, the log-standard and reconstruction is used to partition the shale and reservoir. Three ways are put up synchronously, direct prediction from seismic attributions, seismic invertion and 3D reservoir modeling in depth domain, the consistent reservoir is revealed in three scales.The GR, porosity and RLLD invertion are carried out in order to obtain sand, porous reservoir and oil reservoir. In this stage, the face- constraint is used in reservoir prediction.On base of 3D properties modeling, the reservoir modeling is build up by conversion in oil-standard.Several drills shows the success and the practicability of fine reservoir prediction which is proposed in this paper.