论文部分内容阅读
随着非常规油气勘探进入快速发展阶段,中国致密油气勘探取得了丰硕成果。基于多年非常规油气勘探实践,结合陆相断陷盆地致密油藏特征,初步将中国陆相盆地致密油藏分为致密砂岩油藏和特殊岩性致密油藏。特殊岩性致密油藏包括泥灰岩型致密油藏、碳酸盐砾岩型致密油藏、凝灰岩型致密油藏等。与常规致密砂岩油藏相比,特殊岩性致密油藏储层成因特殊,储集空间类型多样,常规地球物理方法预测困难。通过对冀中坳陷束鹿凹陷沙河街组三段下亚段泥灰岩-砾岩致密油藏的解剖,建立了束鹿地区特殊岩性致密油藏的成藏模式。对于特殊岩性致密油藏的勘探,需要多因素综合分析,总结致密油成藏控制因素,建立适合探区的油气成藏模式,以此指导后续勘探开发。
As unconventional oil and gas exploration is entering a phase of rapid development, China’s tight oil and gas exploration has yielded fruitful results. Based on years of unconventional oil and gas exploration practices and based on the characteristics of tight reservoirs in continental rift basin, the tight reservoirs in the continental basins in China are divided into tight sandstone reservoirs and special lithologic tight reservoirs. Special lithologic tight reservoirs include marl-type tight reservoirs, carbonate conglomerate-type tight reservoirs and tuff-type tight reservoirs. Compared with the conventional tight sandstone reservoirs, the reservoirs of special lithologic tight reservoirs have a special type of genesis and various types of reservoir space, and conventional geophysical methods are difficult to predict. Based on the dissection of the marlstone-conglomerate tight reservoir in the lower section of Shahejie Formation in Shulu Sag of Jizhong Depression, a reservoir forming model of special lithologic tight reservoir in Shulu area was established. For the exploration of special lithologic tight reservoirs, a multi-factor comprehensive analysis is needed to summarize the control factors of tight oil accumulation and establish the hydrocarbon accumulation model suitable for the exploration area to guide subsequent exploration and development.