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为揭示注水开发中后期油藏水淹状况及潜力分布 ,探索合理的开发技术政策 ,运用毗邻的开发早期系统油基泥浆取心井与注水开发中后期的密闭取心井的分析化验及动态等资料 ,研究了阿南低渗透砂岩油藏的纵向及层内水淹特征、水淹层的物性变化及孔隙结构特征的变化 ,探讨了油层水淹后对开发的影响。分析认为 ,阿南低渗透砂岩油藏相对高渗层 ,既是油藏的主力层 ,也是油层污染和水淹的主要对象 ,油层水淹的结果 ,导致喉道分异加剧 ,粗喉更粗 ,细喉更细 ,使油层主要流动喉道控制的有效孔隙体积减少 ,无水采油期缩短 ,最终驱油效率降低 ,这是目前油田注水开发含水高、含水上升快 ,产油量低 ,油田不能通过提液提高产量的根本原因。细分开发层系 ,是提高这类厚层砂岩油藏驱油效率的有效途径
In order to reveal the reservoir flooding situation and potential distribution in the middle and later stages of waterflood development, explore reasonable development and technical policies, use the adjacent developed early system oil-base mud coring wells and water injection to develop the middle and later closed-center coring well analysis and dynamic Data, studied the vertical and intra-layer flooding characteristics, the change of physical properties of water-flooded layers and the changes of pore structure in Anan low-permeability sandstone reservoirs, and discussed the impact on the development after the flooded reservoirs. The analysis shows that the relatively high permeability layer of Anan low permeability sandstone reservoir is not only the main reservoir but also the main object of reservoir contamination and flooding. The result of flooding is that the throat divergence is aggravated, the coarse throat is thicker and thinner The finer throat reduces the effective pore volume controlled by the main flowing throat of the reservoir, shortens the dry recovery period and ultimately reduces the oil displacement efficiency. This is the reason that the development of waterflooding in oilfields is currently characterized by high water cut, rapid rise of water cut, low oil yield, Extract liquid to improve the yield of the root causes. Subdivision of development strata is an effective way to improve the flooding efficiency of such thick sandstone reservoirs