Lateral Prediction Of Buried Hill Fractured-vuggy Reservoir For Lower Paleozoic In Chengbei306-Zhuanghai10 Area

In the oil and gas reservoir exploration and development of buried hill, as the reservoir heterogeneity is generally more serious, the prediction and description for spatial distribution and change of the reservoir is the key and difficulty of exploration and development.The impact of multistage tectonization of the buried hill reservoir for Lower Paleozoic in Chengbei306-Zhuanghai10 area lead to that buried hill fault system is complex and diverse, the degree of weathering and erosion formation is varying, the scale and form is ever-changing, the spatial distribution of reservoir and fractured-vuggy zone of the favorable hydrocarbon accumulation and migration in the layered reservoir is poor, the horizontal is varying, the heterogeneity and anisotropic is strong, the diversity of the reservoir and flow space is diversity, the cause of multi-stages is complex and so on. These bring great difficulties to the lateral prediction and description of buried hill fractured-vuggy reservoir. So it is necessary to use a new method to further study of horizontal distribution of the reservoir.Firstly, according to the drilling mud logging, well logging, properties and analysis data, the author understood the basic reservoir characteristics of the lithology, pore structure, reservoir properties. We knew the longitudinal characteristics of reservoir by seismic coherence technology. It is a solid foundation of determining the grading standard for the buried hill reservoir identification, and the lateral prediction of buried hill fractured-vuggy reservoir.Secondly, according to the conventional logging data, we analyzed log response characteristics of the corrosion or cracks segment, obtained the log response characteristics and the criterion for distinguishing. On the base of this criterion, we extracted the parameters of conventional logging, which have controlled the target layer reservoir characteristics, and built a PSO-SVM model of the reservoir prediction in the single well, and predicted the unknown layers, there is a higher approximate degree between predicted result and integrated interpretation result.Besides, by the combination of the precise prediction of single well reservoir and qualitative analysis of the characteristics of seismic response, we obtain the correspondence of the seismic attributes and results of the precise prediction of single well reservoir. On the base of it, we built a PSO-SVM and SVM model of the lateral prediction for buried hill fractured-vuggy reservoir. By using RS to reducing the 21 seismic attributes, we obtained the 9 seismic attributes which can reflect the development situation of buried hill fractured-vuggy reservoir. We used the PSO-SVM and SVM model to predicting lateral prediction of buried hill fractured-vuggy reservoir by the data of 9 seismic attributes, and drew the horizontal distribution map of buried hill fractured-vuggy reservoir.Finally, by analyzing the predicted results of two models, we believed that the development degree of the lateral prediction of buried hill fractured-vuggy reservoir in Chengbei306-Zhuanghai10 area is poor in the overall level of performance, there are some isolating and stripping forms in the plane, and the distribution area is limited. And we also believed that there are some development zones of the space of dissolution, these regions are favorable positions for further exploration.