渤海W油田复杂低阻油藏含油分布模式及应用

Oil distribution pattern of low resistance reservoirs in oil field W and the application to Bohai area

近年来,随着渤海油田低阻储层评价及识别技术的不断成熟,在馆陶组陆续发现一批非常规低阻油藏,成为新的储量增长点。由于该类型油藏物性差、束缚水饱和度高、油水分布复杂,开发难度整体较大。认清储层含油分布模式并准确预测高渗、高产甜点已是低阻油藏高效开发的关键。本文基于储层构型分析方法,综合应用岩芯、测井、生产动态等资料,对渤海W油田辫状河低阻储层含油分布主控因素开展研究,实现了辫状河低阻大井距下的储层构型精细描述。研究表明,该区辫状河低阻储层呈差异化含油分布模式,具有沉积微相控制物性、物性决定含油性的规律,其高渗透率心滩坝是油气富集区和高产甜点区。利用此研究成果在心滩坝甜点区先后部署实施7口水平井,均取得较好生产效果。

In recent years low resistance reservoir evaluation and recognition technology is getting mature and a lot of unconventional low resistance reservoirs have been discovered in Guantao formation,which becomes the new growth point of oil reserves.Due to poor physical property,high irreducible water saturation and complex oil-water distribution such reservoir is more difficultly developed.Recognition of oil distribution pattern and accurate prediction of high permeability and high yield sweet spots in the reservoirs are the key to develop such reservoirs.Based on analysis of configuration of the reservoirs and integration of cores,well log and dynamic production data this paper deals with main control factors of low resistance reservoir distribution at river braided area in oil field W in Bohai area and the reservoir configuration is finely described with data of long-distance spaced wells.The result shows that oil distribution pattern of low resistance reservoirs at river braided area in the study area is differentiated.The sedimentary micro facies controls physical property,the physical property the oil-bearing law.The oil-gas is concentrated and high yield sweet point is generally located in high permeability channel bar area.According to the mentioned above 7 horizontal wells are implemented in the high permeability channel area with good production result.