• 责任者：Li Xushen (Zhanjiang Branch ; CNOOC ; Zhanjiang 524057 ; China) ; Pei Jianxiang
• 刊名：Natural Gas Industry
• 出版年：2013
• 卷期：33(11)
• 关键词：天然气 ; natural gas ; 油气藏形成 ; reservoir formation ; 莺歌海盆地 ; Yinggehai Basin
• 页码：p.16-21
• 图表：6 illus., 16 refs.
• 分类号：1003
• issnNo：ISSN1000-0976
• isbnNo：CN51-1179/TE

     Ledong 22 1/15-1 are two large medium to-shallow gas fields of structural-lithological type controlled by diaper dome anti clines. In order to understand its unique gas accumulation patterns of the diaper structure, we analyzed the gas play conditions in the study area. The structure in which the Ledong 22 1 and 15 1 gas fields occur is located in the hydrocarbon kitchen of the central de pression with favorable source rock conditions and the diapiric rising providing space for gas accumulation. The deep high-pressure composite geotemperature-geopressure system drives gas migration into the shallow normal temperature-pressure system. Then, natural gas migrates vertically along the faults and microfractures related to diapiric rising into shallow littoral sandstone and tempes- tite reservoirs. According to the spatial combination of the diaper structure with natural gas reservoirs, and adopting such research methods as kinetics of hydrocarbon generation and carbon isotopes, this paper discussed the relationship between the diaper structure and gas accumulation. On one hand, the diaper structure determines the spatial combination of natural gas which accumulates in the structural lithological traps on the top and two sides of the diaper structure. On the other hand, the development and evolution of the diaper structure has the genetic linkage and a coupling relation with hydrocarbon generation, migration and accumulation. It was con cluded that the gas reservoirs in the study area are featured by late enrichment, mixed sources and episodic accumulation, and that the hydrocarbon accumulation process can be divided into 3 stages which corresponds with the episodic activity of the diaper struc ture.