高邮凹陷阜四段页岩油甜点预测技术及应用OA

The fourth member of the Funing Formation(referred to as Fu 4 Member)in the Gaoyou sag of the Subei Basin is rich in shale oil resources.However,its exploration and development are still in the initial stage,making seismic sweet-spot prediction imperative to clarify the exploration potential and development direction.We define total organic carbon(TOC)content,free hydrocarbon(S1),porosity,brittle mineral content,pressure coefficient,and in-situ stress as the key parameters for predicting geologic-engineering sweet spots.Based on sweet spot characteristics,the relationships between key geologic-engineering and elastic parameters are established through petrophysical analysis.Using noise-resistant elastic inversion with full-gather quadratic fitting,a high-precision geophysical parameter prediction workflow is constructed,enabling the quantitative prediction and comprehensive evaluation of geologic-engineering sweet spots.Research results indicate an area of exceeding 84.00 km2 for high-graded sweet spots in the study region.Top reservoir properties occur in the Fanchuan sub-sag,with TOC content up to 1.9%,S1 of 4.6 mg/g,porosity of 8%,brittle mineral content of 85%,pressure coefficient above 1.6,and stress difference ratio below 0.2.These prediction techniques,validated by the high-yield commercial oil flow from Y108,a horizontal well deployed in the optimized sweet-spot area,provide technical support for shale oil exploration and development in the region.