欢喜岭油田欢17块兴隆台油层精细油藏研究

The Fine Reservoir Study of Huan17 Block in Huanxiling Oil- field

欢喜岭油田欢17区块下第三系沙河街组沙一下～沙二段兴隆台油层是主要目的层,为稠油油藏,投入开发20年,经历了4个开发阶段,部分地区采出程度达到36.67％。为了认清该区的开发潜力,通过对该区三维地震资料进行高分辨率处理、全三维解释,进一步落实兴隆台油层顶面构造。结合构造、储层及油气水分布特征对油藏进行综合评价,重新划分四级断块含油面积,计算地质储量、可采储量。认为采出程度计算偏高是由于石油地质储量计算偏低造成的,其主要原因是油层有效厚度解释问题。指出在采用蒸汽吞吐+蒸汽驱开发方式时,总采收率预计可达到50％,应有较大的开发潜力。根据综合研究成果编制开发调整方案,提出下一步井位部署意见。

The Xinglongtai oil-formation of the lower part of S1 -S2 in Paleogene of Huan17 block in Huanxiling oilfield is the major objective formation, and is high viscosity oil reservoir. It has been developed for 20 years and undergone four stages. The recovery efficiency has attained to 36. 67% in some of its districts. In order to know the developing potential, we furthermore make sure the top surface structure of Xinglongtai oil-bearing formation by the high-resolution processing to the 3D seismic data and whole 3D interpretation to this block. Combining structure, reservoir, oil and water distributive character, we made comprehensive evaluation to the reservoir and re-divided it into four grade fault block oil-bearing area, calculated reserves in place and recoverable reserves. We think that high calculation of recovery efficiency was caused by the low calculation of reserves in place, and the effective pay thickness interpretation was the main reason. The overall recovery efficiency can be predicted to get to 50% when using cyclic steam stimulation combined with steam flooding scheme. There should have bigger developing potential in this block. According to the comprehensive study achievements we make developing adjustment schemes and give suggestion of well deployment.