Reservoir Architecture Characterization and Rolling Development Based on Well Logging-Seismic Data and Dynamic Information Fusion—A Case Study of Sha 1 Member in Block D of Nanpu Oilfield in the BHW Basin

The ultra-low permeability compound mouth bar in small continental rift lake basin is the main development unit of oilfield. However, due to the multiple effects of complex reservoir structure, rapid lateral variation of sand body and well spacing limitation, the quantitative characterization of reservoir is difficult, the production contradiction is prominent, and the fine rolling development lacks strong evidence. Using the Es1 formation sandstone reservoir in Nanpu D area of Bohai Bay Basin as an example, guided by the development of dynamic and static contradictions, use the technology of seismic body frequency division fusion, frequency band optimization and fusion body attribute optimization to depict the 6-level configuration interface of sedimentary body [1]. The short-term cycle types and combination rules based on the medium and long-term cycle background are analyzed, and then the composite dam body is dissected under the constraints of short-term structure type, sedimentary microfacies and 7-level configuration dynamic response data to evaluate the rolling potential of different sedimentary bodies and guide fracturing development. The research shows that: ① The frequency division fusion method improves the correlation between seismic attributes and sand body thickness, thus improving the prediction accuracy. ② There are differences in the internal structure of the same type of short-term cycle composite dam in different periods of long-term cycle. The progradation angle is 0.2–1°. In the middle stage, the progradation angle is large, and the interlayers are few and thin. In the early and late stages, the progradation angle is small, and the interlayers are many and thick. The main controlling factor is the A/S change rate. ③ Different sedimentary microfacies have different reservoir architecture characteristics, and the progradation angle of high energy unit is higher than that of low energy unit. ④ The 6-level configuration units are macroscopically connected, but the 7-level configuration units within them are weakly connected, which is the main reason for the inconsistency of oil-water interface of different sedimentary bodies. The understanding of configuration explains the contradiction of fracturing water injection development, and further guides the rolling development expansion to increase reserves 80.6 × 104 t, and the new production capacity is 1.2 × 104 t. ⑤ The results of single sand body configuration guide the staged fracturing and reconstruction of the reservoir. The average daily oil production of single well is 4.6 t, the effective water injection development wells account for 88%, and the dynamic prediction recovery rate is 23%.The above research adopts reverse thinking, driven by dynamic and static data, uses frequency division and fusion technology to mine seismic implicit geological information hidden in the seismic body, and dissects the reservoir configuration of the composite dam under the joint guidance of external factors (sequence) and internal factors (sedimentation). The results promote the rolling development of reservoir benefits. This thought has reference significance for the study of similar reservoirs.