Evaluation of Shale Oil Sweet Spot and Rich Area in Jurassic Lianggaoshan Formation,Northeast Sichuan Basin
In 2020,the Ping'an 1 well in the northeastern part of Sichuan Basin tested 112.8 m3/d in the Jurassic Lianggaoshan Formation shale,making a breakthrough in shale oil exploration.However,the daily oil production of other Wells deployed in succession is very different,and the exploration and development effect are not ideal,which restricts the selection of shale oil rich areas.In response,in this paper,the oil sweet spot parameter(free oil amount)is obtained based on the improved Δlog R method and the formation free oil recovery model,the physical property sweet spot parameter(porosity)is obtained by multiple linear regression analysis,the elastic energy sweet spot parameter(formation pressure coefficient)is predicted by Bowers method,the brittleness index predicted by comprehensive random forest algorithm and the Young's modulus obtained by mathematical model.By adopting an improved analytic hierarchy method,the comprehensive evaluation index of the sweet spot is obtained and applied to key shale oil exploration wells.It is considered that the potential favorable intervals of PY1 and PA1 wells are distributed in the bottom of Liangshang1,the bottom of Liangshang2 and the middle of Liangshang3,and the YQ1 well is distributed in the middle bottom of Liangshang1,the bottom and the top of Liangshang3.The target areas of plane optimization are mainly concentrated in the north of PY1 and PA1 wells and near YQ1 wells.
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