【作者】 赵必强；

【导师】 肖贤明；

【作者基本信息】 中国科学院研究生院（广州地球化学研究所） ， 地球化学， 2006， 博士

【摘要】 琼东南盆典型特点是高温高压,天然气成藏复杂。长期以来对油气运聚成藏规律认识深度不够,对开拓新的勘探领域缺少科学依据。本研究开展琼东南盆天然气运聚成藏规律研究,取得了如下主要成果与认识: （1） 崖13-4与崖13-6构造天然气与崖13-1构造天然气属同期形成,均来自崖南凹陷斜坡带崖城组含煤岩系;天然气主成藏期在2Ma以后;天然气经历了从崖13-1/崖13-6向崖13-4构造的区域性运移规律。 （2） 宝岛构造有两次天然气充注:早期为低成熟度烃类气,充注时间在10—8Ma以前;晚期为CO₂气,充注时间为10—8Ma;由于CO₂气突发性大量注入而充满了储层空间,阻止烃类气体进一步注入,因而形成CO2气藏。 （3） 崖21-1构造储层超压形成时间于晚中新世,明显早于崖南凹陷烃源岩大量生排气阶段;超压的形成妨碍了天然气的区域性运移,是导致了崖21-1构造未形成商业性气田的主要原因。 （4） 崖城凸起天然气勘探应将重点放在崖南凹陷的西北部;宝岛地区烃类气体勘探应避开断层,寻找较晚的圈闭构造;在超压区的天然气勘探,应寻找早期形成的圈闭体系。 本研究成果不仅对于琼东南盆地油气评价与勘探具有指导作用,而且对于我国其它类似油气盆地成藏规律的研究具有借鉴与参考价值。更多还原

【Abstract】 The Qiongdong Basin is characterized by high temperatures and strong pressures, and complicated types of natural gas pools. For these reasons, there has been no deep understanding on the migration and accumulation patterns of gases for a long period, and lack of scientific ideas for further exploration in this basin. In this study, a combination method of fluid inclusion technique with hydrocarbon generation kinetics modeling has been applied to investigate the migration and accumulation pattern of gases in the basin. The following main results have been obtained:（1）. The Ya13-4 and Ya13-6 gas pools formed with the same period of the Ya 13-1 gas pool. They were originated from a set of coal measure source rock in the Yacheng Formation from the slope area of the Yanan Depression. The gas pools were mainly filled after 2 Ma. The gas migrated from the Ya13-1/Ya13-6 structure to the Ya13-4 structure.（2）. The Baodao gas pools experienced two phases of gas charging. The first phase occurred before 10-8 Ma with a lower mature hydrocarbon gas, and the second after 10-8 Ma with a large amount of CO₂ gas. The reservoirs were fully filled by the CO₂ gas during a short period, which prevented the hydrocarbon gas from further migration into the reservoirs to form the CO2 gas pools.（3） . The super-pressure system of The Ya21-1 structure was formed during late Miocene, obviously earlier than the main stage of gas generation and expulsion of the source rock. The super-pressure obstructed natural gases from a regional migration into the reservoir, which became the main reason for the Ya21-1 trap without a commercial gas.（4）. The perspective area for natural gas in the Yacheng Uplift is believed in the north- west region of the Yanan Depression. The exploration for hydrocarbon gases should look for the later-formed trap , or be away from the faults in the Baodao area. The gas exploration in the super-pressure area should address the earlier-formed traps.These results not only give a guide to the gas evaluation and exploration in the Qiongddongnan Basin, but also provide a case study of gas migration and accumulation for the petroleum-bearing basins with a similar geological background.更多还原