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塔里木盆地下古生界发育巨厚白云岩层,具有优质的生储盖组合配置,资源潜力巨大;下古生界白云岩层系内主要发育2套优质储盖组合,代表2个勘探领域,分别为盐上白云岩领域与盐下白云岩领域。通过对成功与失利井烃源岩、储层、盖层、古隆起、圈闭等因素排查分析,厘定制约盐上白云岩领域与盐下白云岩领域的关键石油地质要素,并通过对关键石油地质要素的新认识优选有利勘探区带。研究结果表明,制约盐下白云岩领域规模成藏的关键地质条件为古隆起背景、烃源岩背景;制约盐上白云岩领域油气规模成藏的关键地质条件为优质盖层、烃源岩发育背景与走滑断裂。建立在古隆起分布研究、生烃凹陷分布研究、区域性储盖组合分布研究基础上,结合现今目的层埋深情况,优选了巴东—塔中—古城隆起、塔北隆起2个盐下白云岩有利勘探区带与满西低凸起—古城低凸起盐上白云岩有利勘探区带。
The Lower Paleozoic in the Tarim Basin develops a thick dolomite layer with high quality reservoir-cap assemblage with huge resource potential. Two sets of high-quality reservoir-cap assemblages are mainly developed in the Lower Paleozoic dolomite system, representing two exploration areas, namely Salt on dolomite field with salt under dolomite field. Through the investigation and analysis of the source rocks, reservoirs, cap rocks, paleo-uplift and traps in the success and failure wells, the key petroleum geologic factors that control the salt-dolomite and salt-dolomite fields are determined. By analyzing the key petroleum New understanding of geological elements favors favorable exploration zones. The results show that the key geological conditions restricting the scale-forming of sub-salt dolomite are Paleo uplift background and hydrocarbon source rock background. The key geological conditions restricting hydrocarbon accumulation in salt-rich dolomite are high-quality caprock and source rock Background with slippery rupture. Based on the study on the distribution of paleo-uplift, the distribution of hydrocarbon generating depressions and the distribution of regional reservoir-cap assemblages, and combining with the present buried depths of the target layer, we selected the Badong-Tazhong- Yan You You exploration zone and the Manchu low bulge - ancient city low protuberance salt dolomite favorable exploration zone.