CAJ | 학술논문

东濮凹陷是中国东部地区典型的富含油气盆地，经过数十年的勘探已相继发现了一批油气田，近期在胡状集潜山钻探的胡古2井于二叠系上石盒子组、石千峰组试获工业气流。通过对胡古2井二叠系天然气地球化学特征的系统研究，同时结合区域地质背景资料，综合分析了其成因类型及来源。研究表明，该天然气烃类气体组成以甲烷为主，重烃气含量较低，干燥系数为0．977～0．985，属于干气；甲烷、乙烷、丙烷碳同位素值分别为－28．70‰～－28．40‰，－16．00‰～－14．50‰，－19．00‰～－15．70‰，且乙烷、丙烷碳同位素发生倒转，主要是由同源不同期的天然气混合所导致。胡古2井二叠系天然气属于煤成气，来自于石炭—二叠系煤系烃源岩，且喜马拉雅期高演化阶段生成的干酪根裂解气占主体。
동복요함시중국동부지구전형적부함유기분지，경과수십년적감탐이상계발현료일비유기전，근기재호상집잠산찬탐적호고2정우이첩계상석합자조、석천봉조시획공업기류。통과대호고2정이첩계천연기지구화학특정적계통연구，동시결합구역지질배경자료，종합분석료기성인류형급래원。연구표명，해천연기경류기체조성이갑완위주，중경기함량교저，간조계수위0．977～0．985，속우간기；갑완、을완、병완탄동위소치분별위－28．70‰～－28．40‰，－16．00‰～－14．50‰，－19．00‰～－15．70‰，차을완、병완탄동위소발생도전，주요시유동원불동기적천연기혼합소도치。호고2정이첩계천연기속우매성기，래자우석탄—이첩계매계경원암，차희마랍아기고연화계단생성적간락근렬해기점주체。
The Dongpu Sag is a typical oil and gas producing unit in the Bohai Bay Basin in east China. A series of oil and gas fields have been discovered in recent years. In 2013, well Hugu 2 was drilled in the Huzhuangji area, finding industrial gas flows in the upper Shihezi and Shiqianfeng formations in the Permian. The geochemical charac?teristics and types of natural gas from well Hugu 2 were studied. The natural gas has a high methane content and low heavy hydrocarbon content. The dryness coefficient ranges from 0.977 to 0.985. The carbon isotopic values of methane, ethane and propane range from-28.7‰to-28.4‰,-16.0‰to-14.5‰, and-19.0‰to-15.7‰, respectively. The carbon isotopic values of ethane and propane display reversal due to the mixing gases from the same source rocks at different stages. The gases from the Permian in well Hugu 2 are derived from the Carboniferous and Permian coal measures. A large proportion of the gases was cracked from kerogens during the Himalayan period.