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下二门油田中下层系于1978年8月投入开发,经历30多年的高速、高效开发,已进入特高含水开发后期,目前地质储量采出程度高达40.97%,综合含水96.64%。开发上,由于构造复杂及储层变化快,局部存在窜层、“高水低油”、局部构造认识不清等问题,制约了中下层系精细开发。中下层系平面、纵向储量动用况、水淹状况、剩余油潜力等存在较大差异,特别是厚油层内,受沉积相带及层内隔夹层遮挡,强水淹与中、弱水淹共存,厚油层内仍具有一定挖潜空间。通过开展下二门油田中下层系厚油层构造特征研究,统一地层划分层号、进行局部构造特征及剩余油分布状况研究,为下步措施调整挖潜提供地质基础资料及决策依据。
The lower and middle reaches of Lower Ermen Oilfield was put into operation in August 1978. After more than 30 years of high-speed and high-efficiency development, the middle and lower reaches of Xiaermen Oilfield have entered the later stage of ultra-high water-cut development. At present, the reserves of geological reserves are as high as 40.97% and the comprehensive water content is 96.64%. Due to complex structure and rapid reservoir change, there are some problems such as channeling, local high-water-low oil, and unclear local structure, which restrict the fine development of middle and lower strata. There is a big difference between the middle and lower strata plane, the vertical reservoir utilization, water flooding and remaining oil potential. Especially in thick oil reservoirs, they are obscured by sedimentary facies belts and interbeds, strong flooding and moderate flooding coexistence , Thick oil layer still has some potential to tap the potential. Through the research on the structural characteristics of the middle and lower thick oil reservoirs in the Xiaermen Oilfield, the stratigraphic stratigraphic numbers are unified, the local tectonic features and remaining oil distribution are studied, and the geological basis and decision-making basis are provided for the adjustment and tapping potential of the next measures.