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蒙古国塔南凹陷南屯组中发育大量远岸水下扇沉积,综合岩石学特征、重矿物组合及地震资料分析,确定其为盆地陡坡物源供给形成,属于罕见的陡坡远岸水下扇.在总结陡坡远岸水下扇地震、测井及岩心特征的基础上,将其划分为供给水道、内扇、中扇、外扇4种亚相及若干微相,不同相带特征差异显著.陡坡远岸水下扇主要沿中央断层呈串珠状展布,并在低水位体系域、水进体系域及水退体系域中均有发育,其形成和演化受物源供给、古地形及构造运动3方面因素共同控制.其储集物性整体较差,但在周围高压暗色泥岩的配合下,往往可以形成大量岩性油气藏和构造—岩性复合油气藏,受非连续沉积及层内非均质性影响,陡坡远岸水下扇油藏通常具有含油层数多、单一油层厚度薄、不同油层之间含油性差异大的特点.
In the Nantun Formation of the Tanan Sag in Mongolia, a large number of submarine submarine fan deposits are developed in the study area. Comprehensive petrological characteristics, heavy mineral assemblages and seismic data analysis confirm that it is a source of sediment supply to the steep slopes of the basin, belonging to a rare steep submarine submarine fan Based on the summary of the seismogenic, well logging and core characteristics of the steep submarine submarine fan, it is divided into four subfacies and several microfacies of the water supply channel, inner fan, middle fan and outer fan, and the characteristics of different facies bands are significantly different . The steep submarine submarine fan spreads mainly along the central fault with beaded shape and develops in the low water system tract, the water-in-system tract and the water-retreat system tract. The formation and evolution of the submarine fan are influenced by the source of the provenance, Tectonic movement 3. The reservoir properties are generally poor, but a large number of lithologic reservoirs and tectonic-lithologic composite reservoirs can often be formed under the cooperation of the surrounding high-pressure dark mudstone. Due to the non-continuous deposition and intra-layer Inhomogeneity, the steep submarine submarine fan oil reservoirs usually have the characteristics of many oil layers, thin single oil layer and large difference of oil content among different oil layers.