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涪陵地区位于“开江-梁平海槽”西侧,存在发育高能相带的地质背景,飞仙关组主要发育白云岩储层和鲕粒灰岩或颗粒灰岩储层.采用地质-地球物理互馈结合的方法,对该区飞仙关组储层开展了地球物理响应特征及正演模拟的研究,结果表明:白云岩储层速度相对致密白云岩有所降低,降低幅度有限,仍高于致密灰岩,在地震剖面上表现为低频强振幅特征;地震响应分析结果显示,迭瓦状前积之上的波谷反射可能是鲕粒灰岩或颗粒灰岩储层发育的有利位置,正演模拟证实,滩顶对应波谷,滩底对应波峰,孔隙发育差异和储层厚度的不同造成振幅强弱有别,滩体延伸长度的不同,可分别形成长轴状与短轴状迭瓦状前积,滩体叠置地方振幅减弱.通过地震异常平面规律的刻画,认为长轴状强振幅迭瓦状前积在研究区最有利,是优先考虑的勘探有利区.
Fuling area is located in the “Kaijiang - Liangping Trough ” west, there is the development of high energy facies geological background, Feixianguan Formation mainly dolomite reservoirs and oolitic limestone or granular limestone reservoirs.Using geology - Geophysical mutual feedback method, the geophysical response characteristics and forward modeling of the Feixianguan Formation reservoir in this area are studied. The results show that the dolomite reservoir velocity is relatively lower than that of the tight dolomite, and the reduction range is limited, Which is still higher than that of the tight limestone and shows the characteristics of low frequency and strong amplitude on the seismic section. The seismic response analysis shows that the trough reflection above the preovarian shaped deposition may be favorable for the development of oolitic limestone or granular limestone reservoirs The forward simulations confirm that the amplitude of the amplitude varies with the troughs corresponding to the trough, the corresponding peaks at the beach bottom, the differences in pore development and the thickness of the reservoir, and the difference in the extensional length of the tidal flats can form the long axis and the short axis respectively The amplitudes of the pre-shingle plot and the bank overlap are weakened.According to the anomalous plane law of seismic anomalies, it is considered that the preponderance of long-axis and strong-amplitude laminar shoal is the most favorable in the study area and is the favorable prospecting area.