世界范围内已发现了相当数量的岩性尖灭油气藏,国内外学者对其研究的重点则主要集中于油气成藏机理、注采井网的适应性及注水开发中后期的综合调整,而在渗流机理和产能计算方面尚属空白.推导岩性尖灭油藏直井井网产能公式的难点在于其地层非等厚,外边界条件复杂,同时还必须考虑重力因素的影响.为此,应用等值渗流阻力法求解了简化后的岩性尖火油藏拟三维单相稳定渗流数学模型的产能公式,并针对其渗流特征提出了非等排距注水开发方法,以改善同一注水井排附近生产井排注水受效不均的状况,提高注水效率.%A good number of lithologic pinehoul petroleum reservoirs has been found around the world, the scholars at home and abroad concentrate their attentions mainly on the fields of hydrocarbon accumulation and formation mechanisms, the adaptability of injection-production well patterns and the comprehensive adjustments in middle and late stages of waterflooded development, but there are still no relevant researches on the aspects of filtration mechanism and productivity calculation. The chief difficulties to derive the productivity formula of vertical well pattern in lithologic pinchout oil reservoir are non-isopachous formations, complicated outer boundary conditions and the influences of gravity. Therefore with the help of equivalent filtrational resistance method, a simplified, pseudo-three dimensional , monophasic and constant filtration mathematical model is solved for the lithologic pinchout reservoir in this paper, and moreover, in view of its percolation characteristics, the water flooding method with various well array distances is proposed to improve disproportional water-injection responses upon the production well lines nearby the injection well array and furthermore enhance the waterflooded efficiency.
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