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根据岩心、电测曲线、录井、分析化验、地震等资料,研究了白音查干凹陷下白垩统腾格尔组沉积相类型和沉积特征,以及腾格尔组沉积相分布规律。结果表明,腾格尔组发育扇三角洲、辫状河三角洲、湖泊和浊积扇4种沉积相,扇三角洲分布在北部陡坡,辫状河三角洲分布南部缓坡,从盆地边缘到盆地中心,沉积相由扇三角洲、辫状河三角洲沉积渐变为半深湖—深湖相沉积,在三角洲侧翼发育滨—浅湖相沉积,在三角洲前缘以及前三角洲和半深湖中发育浊积扇,整体呈南北分异、东西分化,这种沉积格局受盆地周边断层和古地形控制。扇三角洲和辫状河三角洲前缘亚相带仍然是油气聚集的重要相带,而与断层相关的其前缘近岸浊积扇是岩性油气藏勘探的有利目标。
The sedimentary facies types and depositional characteristics of the Lower Cretaceous Tengger Formation and the distribution of sedimentary facies in the Tengger Formation are studied based on the core, electrical logging curve, logging, laboratory analysis and seismic data. The results show that there are four sedimentary facies of fan delta, braided river delta, lake and turbidite fan in the Tengger Formation. The fan delta is located in the northern steep slope and the braided delta is located in the southern gentle slope. From the edge of the basin to the basin center, sedimentary facies Sedimentary changes from fan delta and braided river delta to semi-deep lacustrine-lacustrine sedimentary facies, and deposition of foreland-shallow lacustrine facies flanking the delta. Turbidity fans are developed in the delta front and in the delta and semi-deep lakes, North-South differentiation, east-west differentiation, this sedimentary pattern affected by the basin periphery faults and palaeogeomorphic control. The subfacies of fan delta and braided river delta front are still the important facies belts of oil and gas accumulation, while the fault-bearing nearshore turbidite fan of its front is a favorable target for lithologic reservoirs exploration.