ANALYSIS OF THE GAS HYDRATE MIGRATION AND ACCUMULATION MODEL IN THE DEEP WATER AREAS OF QIONGDONGNAN BASIN
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摘要:
天然气水合物是当今油气资源研究的热点之一，前人对天然气水合物的理化性质和运聚成藏要素已有详尽的研究，但关于水合物的运聚和成藏过程仍众说纷纭，缺乏系统性归纳和总结。为进一步梳理水合物运聚成藏模式，以期对天然气水合物勘探评价及有利富集区带优选预测等有所裨益，笔者以琼东南盆地天然气水合物运聚成藏为研究重点，结合前人有关琼东南盆地水合物成藏模式的研究基础，深入开展高精度三维地震解释与地质综合分析研究，并根据水合物气源供给的构成特点、运聚方式及产出赋存特征等的差异性，重点对琼东南天然气水合物运聚成藏模式进行系统地分类与划分，深入探讨了其运聚分布规律及控制因素等。在此基础上，根据气源供给及源储关系差异，初步将琼东南盆地水合物运聚成藏模式分为下生上储型、自生自储型和复式混合型3大类，其中，下生上储型可分为4小类：气烟囱主导型、泥底辟主导型、微裂缝主导型和断层主导型；自生自储型仅1小类，即浅层原位赋存型。
Abstract:Natural gas hydrate is one of the focuses nowadays in hydrocarbon resource researches. Physical and chemical properties, reservoir forming factors and gas hydrate migration and accumulation mechanisms have been carefully studied in previous references. However, there still remain different opinions and discrepancies on the migration and accumulation process of gas hydrate. Systematic induction and summarization are required. In order to better understand the migration and accumulation model of gas hydrate, which is critical to the exploration and evaluation of gas hydrate and the optimization and prediction of favorable enrichment zones, this paper, taking the reservoir forming types of gas hydrate in the Qiongdongnan Basin as the research focus, made a comprehensive analysis of 3D seismic data and geological research results based on the previous studies. According to the differences in gas source supply, migration and accumulation mode and occurrences of gas hydrate, the migration and accumulation modes of gas hydrate in the Qiongdongnan Basin are systematically classified, and also analyzed and discussed are the distribution pattern and their control factors. According to the difference in gas source and reservoir models, the hydrate accumulation in the Qiongdongnan basin can be divided into three types: the type of lower generation and upper storage, the type of self generation and self storage and the type of compound and mixed genesis. The former two types are further divided into five subtypes, of which the type of lower generation and upper storage includes four subtypes: gas chimney dominated subtype, mud diapir dominated subtype, micro-cracks dominated subtype and fault dominated subtype; and there is only one subtype under the type of self generation and self storage, i.e. the type of shallow in-situ deposits.
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