印缅俯冲增生楔气烟囱分带性及油气成藏规律

发布时间：2018-05-05 17:53

本文选题：印度洋 + 俯冲增生楔　；参考：《地学前缘》2017年04期

【摘要】：印缅俯冲增生楔位于印度板块与欧亚板块俯冲前缘,是深水油气勘探的重要地带。重新审视深水油气勘探潜力、认识增生楔地区油气成藏模式和机理是当前研究热点。印缅俯冲带增生楔提供了一个良好实例和研究契机,它不仅是一个斜向俯冲增生楔,而且是一个气烟囱发育的增生楔。本文基于高精度地震资料,应用地震波组和频谱扫描、地震属性检测以及基于多层感知器的非线性神经网络技术,识别出该区气烟囱具有分带性,且在增生楔斜坡和海沟盆地气烟囱发育。气烟囱总体表现出向海渐新、期次递减的特征,即增生楔斜坡以全新世和中新世两期发育的断层型气烟囱为主,纵向上横跨渐新统至更新统;海沟盆地以全新世发育的背斜型气烟囱为主,纵向上横跨中新统至全新统。气烟囱发育的动力来源为渐新统和中新统烃源岩持续生烃形成的超压,幕式构造活动产生气源通道,古近系和新近系中的泥页岩等提供封盖条件。气烟囱与油气成藏关系密切,具有振幅、频率、相位等地震异常并伴有亮点、平点等地震反射的相关伴生构造是油气运聚的有利目标。结合气烟囱的气源特征,本文提出混源断层型、生物气源断层-背斜型、生物气源背斜型等三种气烟囱成藏模式,指出海沟盆地气烟囱地震异常体具有较好的浅层天然气勘探前景,下覆烃源岩内幕构造、岩性圈闭是另一个有利的油气勘探领域。
[Abstract]:The Indo-Myanmar subduction wedge is located at the front edge of the Indian plate and Eurasian plate and is an important zone for deep water oil and gas exploration. To re-examine the potential of deep water oil and gas exploration and to understand the hydrocarbon accumulation model and mechanism in accretive wedge is a hot research topic at present. The proliferative wedge of Indo-Myanmar subduction zone provides a good example and research opportunity. It is not only an oblique subduction wedge, but also an accretive wedge developed by a gas chimney. Based on high precision seismic data, using seismic wave group and spectrum scanning, seismic attribute detection and nonlinear neural network technology based on multilayer perceptron, it is found that the gas chimney in this area has zonation property. Gas chimneys are developed in accretive wedge slopes and trench basins. The gas chimney shows the characteristics of gradually coming new to the sea and decreasing gradually, that is, the accretive wedge slope is dominated by fault type gas chimneys developed in the Holocene and the Miocene, and straddles the Oligocene to the Pleistocene longitudinally. The Haigou basin is dominated by anticline gas chimneys developed in Holocene, spanning the Miocene to the Holocene longitudinally. The source of gas chimney development is the overpressure of continuous hydrocarbon generation in the Oligocene and Miocene source rocks, the gas source channel generated by the curtain tectonic activity, and the mud shale in the Paleogene and Neogene systems to provide sealing conditions. Gas chimney is closely related to oil and gas accumulation, with amplitude, frequency, phase and other seismic anomalies accompanied by bright spots. The associated structures associated with seismic reflection such as flat points are favorable targets for hydrocarbon migration and accumulation. Combined with the gas source characteristics of gas chimneys, three types of gas chimneys are proposed in this paper: mixed fault, biogas fault-anticline, biogas anticline. It is pointed out that the seismic anomaly of gas chimney in Haigou basin has a good prospect of shallow natural gas exploration, and that the insider structure of overlying source rock and lithologic trap is another favorable field for oil and gas exploration.
【作者单位】：中国石油大港油田公司;中油缅甸凯尔公司;海底科学与探测技术教育部重点实验室中国海洋大学海洋地球科学学院;青岛海洋科学与技术国家实验室海洋地质功能实验室;
【基金】：中石油研究项目(CAL/X6/S/2015016) 国家自然科学基金杰出青年基金项目(41325009)
【分类号】：P618.13

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