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根据琼东南盆地构造沉积特征,区域地球物理调查与油气勘探成果,分析研究了该区疑似泥底辟发育与分布特征及其与天然气水合物富集成矿成藏之间的关系。结果表明:疑似泥底辟与天然气水合物均主要展布于盆地凸起和凹陷构造单元过渡带或沉积凹陷中心等区域,二者分布位置上具有一定的重叠性,而沉积有机质生成的浅层生物气及亚生物气与深部热解气等,均可通过泥底辟及气烟囱或断层裂隙构成的气源供给输导系统,在深水区高压低温稳定域富集成矿形成天然气水合物,表明泥底辟及气烟囱等构成的气源供给运聚通道系统与天然气水合物成藏具有一定的时空耦合配置关系。预测研究区存在“生物气—亚生物气自源自生自储原地成矿成藏、热解气他源断层裂隙输导下生上储异地成矿成藏、热解气他源泥底辟及气烟囱输导下生上储异地成矿成藏”3种类型天然气水合物成矿成藏模式。
According to the tectonic and sedimentary characteristics, regional geophysical survey and oil and gas exploration results in the Qiongdongnan basin, the relationship between the development and distribution of the suspected mud diapirs and their enrichment and mineralization and accumulation in gas hydrate is analyzed. The results show that the suspected mud diapirs and gas hydrates are mainly distributed in the transition zone of structural units such as bulges and valleys or the center of sedimentary sag in the basin. The distribution of the two places has some overlap, while the shallow layers formed by sedimentary organic matter Biogas, sub-biogas and deep pyrolysis gas can all be supplied into the gas supply system through mud diapirs and gas chimneys or fault fissures, enriching and mineralizing into gas hydrate in the high-pressure and low-temperature stable region in the deep-water area, indicating Muddy diapirs and gas chimneys and other gas supply and distribution channel system and gas hydrate accumulation has a certain spatial and temporal coupling configuration relationship. Prediction of the existence of the study area “Biogas - sub-biogas self-sourced from the original reservoir mineralization accumulation, the pyrogen gas source fault fracture under the leadership of different deposits on the formation of mineral deposits, pyrolysis gas source mud The diapir and the gas chimney guide the generative mineralization and reservoir formation in the different places ”3 types of gas hydrate mineralization and accumulation model.