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塔河油田南部AT1井区中三叠统中油组是最重要的含油气层系,其沉积相类型及其对砂体展布和油气储层的控制等地质开发问题倍受重视。文中在地震储层反演、岩心描述和测井分析基础上,结合铸体薄片、粒度分析等大量测试资料,对该地区中油组沉积相类型及特征进行深入研究的结果表明:塔河油田三叠系AT1井区中油组为湖底扇沉积。该区发育AA、AB型非典型鲍玛序列,并主要发育中扇亚相。该亚相可以识别出辫状水道、水道间漫溢、无水道席状砂等微相,主要储集砂体为中扇辫状水道。该文结合区域地质背景,探讨了浊积扇的成因机制,并建立了相应的沉积模式。
The Middle Triassic Zhongyou Formation in the AT1 well area in the southern Tahe Oilfield is the most important petroleum-bearing gas system. The types of sedimentary facies and their geological development issues such as sandbody distribution and the control of oil and gas reservoirs have drawn much attention. Based on the seismic reservoir inversion, core description and well logging analysis, combined with a large amount of test data such as cast thin slice and particle size analysis, the type and characteristics of sedimentary facies in CNOOC reservoir in this area are studied. The results show that: The oil-bearing formation in the AT1 well in the depositional series was deposited as a sublacustrine fan. In this area, the AA and AB atypical Baoma sequences are developed, and the mid-fan subfacies are mainly developed. The subfacies can identify the braided channel, overflow between channels, channel sand sand and other microfacies, the main reservoir sand body fan braided channel. Based on the regional geological background, the paper discusses the genesis mechanism of turbidite fan and establishes the corresponding sedimentary model.