建南气田南飞三气藏颗粒滩储层有利目标预测

The Prediction of Potential Targets of Southern Fei III Grain Beach Reservoir in Jiannan Gas Field

摘要: 建南气田南飞三气藏位于建南构造南高点，发育颗粒滩亚相裂缝–孔隙型储层。飞仙关组三段(T1f3)储层平均孔隙度 < 2%，平均渗透率 < 0.1 mD，属于特低孔、特低渗储层。T1f3颗粒滩具有自西向东迁移的特征，纵向上发育多期滩体叠置，储层分布与滩体发育密切相关。T1f3气藏主力出气层段位于中部，可划分出A、B两个小层，在储层岩性、物性和地震特征上均表现出一定的差异。在前期多属性分析和波阻抗反演的储层预测工作基础上，重点再采用时差、振幅属性刻画不同小层储层分布范围。同时，利用地质、地震资料相结合指出T1f3剩余气分布范围，并复算储量，为下步开发井位部署提供有利依据。

Abstract: The South Fei III Gas Reservoir in Jiannan Gas Field was located at the southern high point of Jiannan structure, where a grain beach fractured-porous reservoir was developed. In the South Fei III Reservoir (T1f3), the average porosity < 2% and permeability < 0.1 mD were extremely low; it belonged to a reservoir with extra-low porosity and extra-low permeability. According to predecessors’ research, southern Fei III grain beach tended to be migrated from the west to the east and with multiple beaches overriding, with the cause that reservoir distribution has close relation with beaches growth. The major gas interval was located in the middle of Fei III, which can be divided into two sublayers as A and B. Those two sublayers show some difference in reservoir lithologic characteristics, property and seismic characteristics. On the basis of earlier reservoir prediction of multi-attribute analysis and wave impedance inversion, particularly combined with time-difference and amplitude analysis, the reservoir distribution of different sublayers could be depicted. Meanwhile, in combination of geological and seismic research, the results indicate that the distribution range of the residual gas of Fei III Gas Reservoir is pointed out. It provides a beneficial guidance for future development planning of well locations.