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通过对天然气碳同位素、氢同位素和干燥系数关系的分析,划分歧口凹陷的烷烃类天然气成因类型,拓展研究区天然气勘探领域,明确今后勘探方向。歧口凹陷的烷烃类天然气包括生物气、生物—热成因混合气和热成因气3个大类,热成因气是凹陷的主力天然气类型,其探明储量占总储量的95%以上。热成因气按母质类型又划分为陆相油型气和煤成气,油型气按成熟度分为低熟气、成熟气和高熟气,主要来自第三系湖相泥岩;埕海潜山天然气属于高熟煤成气,主要来自石炭系—二叠系煤系烃源岩。今后,歧口凹陷天然气勘探应坚持以中深层为主要层段,以潜山和深层碎屑岩为主要勘探领域,同时加强煤成气资源潜力的研究。
Based on the analysis of the relationship between carbon isotope and hydrogen isotope of natural gas and drying coefficient, the types of natural gas of alkanes in Qikou sag are divided, and the exploration area of natural gas in the study area is explored. The future exploration direction is clarified. Alkanes natural gas in Qikou Depression includes three major categories of biogas, bio-pyrogenic gas and pyrogen gas, and pyrogen gas is the main gas type in the depression with proved reserves accounting for more than 95% of the total reserves. According to the parent material type, the pyrogenetic gas is divided into continental oil gas and coal gas. According to the maturity, the oil gas is divided into low-mature gas, mature gas and high-mature gas, mainly from Tertiary lacustrine mudstone. Mountain natural gas is a high-mature coal gas, mainly from the Carboniferous-Permian coal-derived source rocks. In the future, natural gas exploration in Qikou Depression should adhere to the middle and deep layers as the main section, with buried hills and deep clastic rocks as the main exploration areas, and at the same time, strengthen the research on the potential of coal-derived gas resources.