CALIBRATING THE BOTTOM INTERFACE OF GRANITE WEATHERING CRUST RESERVOIR ON THE SONGNAN LIFT IN THE DEEP WATER AREAS OF QIONGDONGNAN BASIN
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摘要:
琼东南盆地深水区松南低凸起花岗岩古潜山风化壳储层油气勘探获重大突破，展示其具有较好勘探前景。针对花岗岩风化壳储集层地震勘探中储集层底界面确定难的问题，以琼东南盆地深水区前古近系花岗岩风化壳为研究对象，应用钻井、测井及地震资料，总结了花岗岩风化壳储层底界面标定的模式。该模式以井资料为依据构建岩石物理模型，采用地震正演模拟方法研究确定不同厚度花岗岩风化壳储层与地震响应之间的联系；从古潜山暴露时间与风化程度关系分析入手，通过印模法研究确定花岗岩潜山古地貌，并在古地貌图上选取古潜山不同位置的暴露点，统计其在地震剖面上对应的风化壳储集层顶底界面双程走时时差，以正演模拟为基准进行多样点拟合分析，获得相应的定量关系式。最后以研究区风化壳储层顶界面作为输入信息，通过关系式计算即可获得全区风化壳储层底界面标定结果，以及风化壳储层时间厚度图。采用上述技术方法对古潜山储层底界面进行标定，提高了花岗岩古潜山风化壳油气储层的预测精度。
Abstract:A great breakthrough has recently been made for oil and gas exploration in the weathering crust reservoir of granite buried hill on the Songnan low uplift in the deep-water areas of the Qiongdongnan Basin. One of the difficulties in seismic exploration for granite weathering crust reservoirs is the determination of reservoir bottom interface. Taking the weathering crust of pre-Paleogene granite in the deep water of the Qiongdongnan Basin as an object of study, and based on the integration of drilling wells, well logging and seismic data, this paper established a calibration model for determination of the bottom interface of the granite weathering crust reservoir. Forward seismic simulation method is adopted to define the relationship between the weathering crust reservoirs of granite with different thickness and seismic responses. Started from the study of the relationship between exposure time and weathering degree of buried hill, the palaeogeomorphology of buried hill of the granite is described with the impression method. On the palaeogeomorphological map, different exposure points are selected to calculate the two-way time interval for the corresponding weathering crust reservoir bottom interface relative to the top interface of the seismic profiles. Based on forward simulation, multi-point fitting analysis is carried out to gain the corresponding quantitative relationship. Finally, taking the top interface of the weathering crust reservoir as a reference, the bottom interface of the weathering crust reservoir and the quantitative time-thickness relationship of the weathering crust reservoir are obtained. Using the above method to calibrate the bottom interface of the buried hill reservoir, the prediction accuracy of the weathering crust reservoir of the granite buried hill will be highly improved.
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