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本文在分析奥陶纪沉积相类型与特征的基础上,提出形成天然气生、储、盖层的有利岩相带时空展布规律;并用TTI法恢复地层真厚度,建立奥陶系埋藏-热演化模式,从而探讨了有机质向油气转化的条件;最后,研究了天然气的主要储集空间类型以及成岩作用对它的影响,特别是对天然气主要聚集场所——奥陶系顶部古岩溶发育特征进行了分析。
Based on the analysis of the types and features of Ordovician sedimentary facies, this paper proposed the spatial-temporal distribution of favorable lithofacies of natural gas, reservoir and caprock. TTI method was used to restore the true thickness of the formation to establish the Ordovician burial-thermal evolution Mode to explore the conditions for the conversion of organic matter to oil and gas. Finally, the types of natural gas reservoirs and their effects on diagenesis are studied. Especially, the development characteristics of paleokarst at the top of Ordovician, which is the main gathering place of natural gas analysis.