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巴兰三角洲地区位于西北婆罗洲活动大陆边缘,其构造格局具有南北分带的特征,即北部挤压应力下叠瓦状逆冲推覆带、中部拉张应力下伸展沉降带、南部压扭作用下挤压反转带。与位于被动大陆边缘三角洲发育的地区不同,其北部三角洲前端收缩量大于中部三角洲末端伸展量的1.8%左右,而这无法用理想的被动大陆边缘三角洲体模型来进行解释。在研究区区域构造背景、应力特征分析的基础上,认为这种现象是区域压应力远距离效应与三角洲发育过程重力驱动综合作用的结果。受构造南北分带的影响,研究区发育的上部、中部和下部油气成藏组合分布于不同构造带内;各构造带不同应力背景形成了各自内部独特的构造圈闭类型,而作为油气运移通道的长期继承性发育的断层则控制了研究区内油气的垂向运移。这些研究结果对巴兰三角洲地区油气地质研究、油气勘探部署及优选有利勘探新领域具有一定的借鉴和指导意义。
The Baran delta region is located on the active continental margin of the Borneo region in the northwest. Its structural pattern has the features of north-south zoning, that is, the imbricate thrust nappe belt under the compressive stress in the north, the extensional subsidence zone under the tensile stress in the middle, Under the pressure reversal belt. Contrary to the developed delta located on the margin of the passive continental margin, the frontal shrinkage in the northern delta is greater than 1.8% of the terminal extension of the central delta, which can not be explained by the ideal passive continental marginal delta body model. Based on the analysis of tectonic setting and stress characteristics in the study area, this phenomenon is considered as a result of the combined effect of the regional long-range stress-relief and the gravity-driven process of delta development. Influenced by the structural north-south zoning, the upper, middle and lower hydrocarbon accumulation assemblages developed in the study area are distributed in different tectonic belts. Each structural belt has its own unique internal structural trap type formed by different stress backgrounds, Long-term succession development of the channel controlled the vertical migration of oil and gas in the study area. These results have certain reference and guidance significance to the oil and gas geology research in Balaam Delta, oil and gas exploration and deployment and the new field of favorable prospecting.